阅读说明：本技术 一种驱油剂渗流性能评价装置及方法 (Oil displacement agent seepage performance evaluation device and method ) 是由 周亚洲 殷代印 王东琪 张承丽 杨泽宏 于 2021-04-26 设计创作，主要内容包括：本发明涉及的是一种驱油剂渗流性能评价装置及方法,其中驱油剂渗流性能评价装置包括注入系统、测量系统、计量系统,注入系统包括活塞容器一、活塞容器二、活塞容器三、泡沫发生器、剪切装置、模拟井筒、快速接头一、快速接头三、快速接头四和快速接头五；测量系统包括快速接头二、岩芯夹置器一、岩芯夹置器二；计量系统包括计量活塞容器一、计量活塞容器二；模拟井筒顶端通过管线和阀门十五与剪切装置连接,模拟井筒侧面有模拟射孔一、模拟射孔二和模拟射孔三；各模拟射孔均与一个快速接头连接；各快速接头可与测量系统连接。本发明能够在高压条件下,评价驱油剂经过井筒沉降和射孔剪切后溶液性能和流动性能。(The invention relates to a device and a method for evaluating the seepage performance of an oil displacement agent, wherein the device for evaluating the seepage performance of the oil displacement agent comprises an injection system, a measurement system and a metering system, wherein the injection system comprises a piston container I, a piston container II, a piston container III, a foam generator, a shearing device, a simulation shaft, a quick joint I, a quick joint III, a quick joint IV and a quick joint V; the measuring system comprises a quick connector II, a core clamping device I and a core clamping device II; the metering system comprises a metering piston container I and a metering piston container II; the top end of the simulated shaft is connected with a shearing device through a pipeline and a valve fifteen, and the side face of the simulated shaft is provided with a first simulated perforation, a second simulated perforation and a third simulated perforation; each simulated perforation is connected with a quick joint; each quick connector may be connected to a measurement system. The method can evaluate the solution performance and the flow performance of the oil displacement agent after shaft sedimentation and perforation shearing under the high-pressure condition.)

1. The utility model provides an oil-displacing agent seepage flow performance evaluation device which characterized in that: the oil displacement agent seepage performance evaluation device comprises an injection system (ZX), a measurement system (CX) and a metering system (JX), wherein the injection system (ZX) comprises a piston container I (B1), a piston container II (B2), a piston container III (B3), a foam generator (F), a shearing device (E), a simulated well bore (G), a quick joint I (Q1), a quick joint III (Q3), a quick joint IV (Q4) and a quick joint V (Q5); the measuring system (CX) comprises a second quick connector (Q2), a first core clamper (C1) and a second core clamper (C2); the metering system (JX) comprises a first metering piston container (D1) and a second metering piston container (D2);

the top end of a simulated shaft (G) is connected with a shearing device (E) through a pipeline and a valve fifteen (K15), the side face of the simulated shaft (G) is provided with a simulated perforation I (G1), a simulated perforation II (G2) and a simulated perforation III (G3), the simulated perforation I (G1) is connected with a pressure gauge II (H2), a valve twelve (K12) and a quick connector III (Q3) through pipelines, the simulated perforation II (G2) is connected with the pressure gauge III (H3), the valve thirteen (K13) and the quick connector IV (Q4) through pipelines, the simulated perforation III (G3) is connected with a pressure gauge IV (H4), a valve fourteen (K14) and a quick connector V (Q5) through pipelines, and the quick connector III (Q3), the quick connector IV (Q4) or the quick connector V (Q5) is connected with the quick connector II (Q2) of a measuring system;

the quick joint II (Q2) is respectively connected with the core clamper I (C1) and the core clamper II (C2), the core clamper I (C1) and the core clamper II (C2) are respectively provided with an inlet valve and an outlet valve, the core clamper I (C1) and the core clamper II (C2) are respectively connected with a metering piston container through the outlet valves, and the bottom end of each metering piston container is connected with a constant-speed constant-pressure pump; the second quick connector (Q2) is also connected with a metering piston container through a pipeline, and a valve seven (K7) is arranged on the pipeline;

any one core clamping device comprises a core clamping device shell, a transparent rubber sleeve and an observation window, wherein the transparent rubber sleeve is arranged inside the core clamping device shell, and a core is arranged inside the transparent rubber sleeve; the side surface of the shell of the core holder is provided with an observation window, a microscope and a light source are arranged outside the observation window, and the shell of the core holder and the transparent rubber sleeve are connected with the ring crush tracker through a pipeline; the two ends of the shell of the core clamping device are respectively connected with the transverse rotating shaft, the shell of the core clamping device can rotate around the transverse rotating shaft, the shell of the core clamping device is connected with the longitudinal rotating shaft, the shell of the core clamping device is perpendicular to the longitudinal rotating shaft, and the shell of the core clamping device can rotate around the longitudinal rotating shaft.

2. The oil-displacing agent seepage performance evaluation device according to claim 1, characterized in that: the device comprises a piston container I (B1), a piston container II (B2) and a piston container III (B3), wherein the piston container I (B1), the piston container II (B2) and the piston container III (B3) are connected in parallel and then are connected with a valve IV (K4) and a valve IV (K5) which are connected in parallel, the valve IV (K8538) and the valve IV (K5) are connected with a foam generator (F), the valve IV (K4) and the foam generator (F) are both connected to a shearing device (E), the shearing device (E) is respectively connected with a valve VI (K6) and a simulation shaft (G), a pressure gauge I (H1) is arranged in front of the valve VI (K6), and the valve VI (K6) is connected with a quick connector I (Q1); the bottom end of the first piston container (B1) and the bottom end of the second piston container (B2) are both connected with the first constant-speed constant-pressure pump (A1), the bottom end of the third piston container (B3) is connected with the second constant-speed constant-pressure pump (A2), a first valve (K1) is arranged at the outlet of the first piston container, a second valve (K2) is arranged at the outlet of the second piston container, and a third valve (K3) is arranged at the outlet of the third piston container.

3. The oil-displacing agent seepage performance evaluation device according to claim 1, characterized in that: the first core clamp (C1) is externally provided with a first core clamp shell (C1 a), the first core clamp shell (C1 a) is internally provided with a first transparent rubber sleeve (C1 b), and the first transparent rubber sleeve (C1 b) is internally provided with a first core (C1C); the side surface of the first core gripper shell (C1 a) is provided with a first observation window (C1 d), the exterior of the first observation window (C1 d) is provided with a first microscope (C1 h) and a first light source (C1 j), and the first core gripper shell (C1 a) and the first transparent rubber sleeve (C1 b) are connected with a first ring pressure tracker (C1 f) through pipelines; two ends of a first core clamp device shell (C1 a) are respectively connected with a first transverse rotating shaft (C1 e), and a first longitudinal rotating shaft (C1 g) is vertically arranged at the center of the first core clamp device shell (C1 a); an inlet valve of the core clamper is valve eight (k 8), and an outlet valve is valve nine (k 9);

a second core clamping device shell (C2 a) is arranged outside the second core clamping device (C2), a second transparent rubber sleeve (C2 b) is arranged inside the second core clamping device shell (C2 a), and a second core (C2C) is arranged inside the second transparent rubber sleeve (C2 b); a second observation window (C2 d) is arranged on the side surface of the second core gripper shell (C2 a), a second microscope (C2 h) and a second light source (C2 j) are arranged outside the second observation window (C2 d), and the second core gripper shell (C2 a) and the second transparent rubber sleeve (C2 b) are connected with a second ring pressure tracker (C2 f) through pipelines; two ends of a second core clamp shell (C2 a) are respectively connected with a second transverse rotating shaft (C2 e), and a second longitudinal rotating shaft (C2 g) is vertically arranged at the center of the second core clamp shell (C2 a); the inlet valve of the core clamper II is a valve ten (k 10), and the outlet valve is a valve eleven (k 11).

4. The oil-displacing agent seepage performance evaluation device according to claim 3, characterized in that: said

A first observation window (C1 d) is arranged on one side surface of the first core clamp shell (C1 a), and a first microscope (C1 h) and a first light source (C1 j) are arranged on the same side of the outer part of the first observation window (C1 d); two opposite side surfaces of a first core clamp shell (C1 a) are respectively provided with a first observation window (C1 d), the same side of the outer part of the first observation window (C1 d) is provided with a first microscope (C1 h) and a first light source (C1 j), or two sides of the outer part of the first observation window (C1 h) are respectively provided with a first microscope (C1 h) and a first light source (C1 j);

a second observation window (C2 d) is arranged on one side surface of the second core clamp shell (C2 a), and a second microscope (C2 h) and a second light source (C2 j) are arranged on the same side of the outer part of the second observation window (C2 d); two opposite side surfaces of the second core clamp shell (C2 a) are respectively provided with a second observation window (C2 d), the same side of the outer part of the second observation window (C2 d) is provided with a second microscope (C2 h) and a second light source (C2 j), or two sides of the outer part of the second observation window (C2 d) are respectively provided with a second microscope (C2 h) and a second light source (C2 j);

the first core clamping device shell (C1 a), the first transparent rubber sleeve (C1 b), the first core (C1C), the second core clamping device shell (C2 a), the second transparent rubber sleeve (C2 b) and the second core (C2C) are all cuboids, the first core (C1C) or the second core (C2C) is 0.01-2.5 cm in width, 2-30 cm in length and 0.5-2.5 cm in height, and the first core (C1C) or the second core (C2C) is a natural core, an artificial core, a bailey core or a sand-filled core.

5. The oil-displacing agent seepage performance evaluation device according to claim 1, characterized in that: the external part of the first metering piston container (D1) is a first metering container shell (D1 a), the side surface of the first metering container shell (D1 a) is a first metering container window (D1 g), a first metering container piston (D1 f) is arranged in the first metering container shell (D1 a), the external part of the first metering container window (D1 g) is provided with a first camera (D1 b) and a third light source (D1D), and the bottom of the first metering piston container (D1) is connected with a third constant-speed constant-pressure pump (A3);

the outside of the second metering piston container (D2) is provided with a second metering container shell (D2 a), the side surface of the second metering container shell (D2 a) is provided with a second metering container window (D2 g), the inside of the second metering container shell (D2 a) is provided with a second metering container piston (D2 f), the outside of the second metering container window (D2 g) is provided with a second camera (D2 b) and a fourth light source (D2D), and the bottom of the second metering piston container (D2 f) is connected with the fourth constant-speed constant-pressure pump (A4).

6. The oil-displacing agent seepage performance evaluation device according to claim 1, characterized in that: one side of the first metering container shell (D1 a) is provided with a first metering container window (D1 g), and the same side outside the first metering container window (D1 g) is provided with a first camera (D1 b) and a third light source (D1D); two opposite side surfaces of the first metering container shell (D1 a) are respectively provided with a first metering container window (D1 g), the same side of the outer part of the first metering container window (D1 g) is provided with a first camera (D1 b) and a third light source (D1D), or two sides of the outer part of the first metering container window (D1 g) are respectively provided with a first camera (D1 b) and a third light source (D1D);

a second metering container window (D2 g) is arranged on one side surface of the second metering container shell (D2 a), and a second camera (D2 b) and a fourth light source (D2D) are arranged on the same outer side of the second metering container window (D2 g); two opposite side surfaces of the second metering container shell (D2 a) are respectively provided with a second metering container window (D2 g), the same side of the outside of the second metering container window (D2 g) is provided with a second camera (D2 b) and a fourth light source (D2D), or two sides of the outside of the second metering container window (D2 g) are respectively provided with a second camera (D2 b) and a fourth light source (D2D).

7. The oil-displacing agent seepage performance evaluation device according to claim 1, characterized in that: the side face of the simulated shaft (G) is provided with a simulated perforation I (G1), a simulated perforation II (G2) and a simulated perforation III (G3) from top to bottom, the simulated perforation I (G1) is positioned at one fifth to one half of the height of the simulated shaft (G), the simulated perforation II (G2) is positioned at one sixth to one third of the height of the simulated shaft (G), and the simulated perforation III (G3) is positioned at the bottom of the simulated shaft (G).

8. The oil-displacing agent seepage performance evaluation device according to claims 1-7, characterized in that: the injection system (ZX), the measurement system (CX) and the metering system (JX) are arranged in the heat-preserving box (M); all the constant-speed and constant-pressure pumps, all the pressure gauges, the foam generator (F), the shearing device (E), all the microscopes, all the cameras and all the ring pressure trackers are electrically connected with a computer (P).

9. A method for evaluating the oil-displacing agent seepage performance of the oil-displacing agent seepage performance evaluation apparatus according to claim 8, characterized by comprising the steps of:

step one, filling an oil displacement agent into the upper part of a piston container I (B1), measuring the position of a piston in the piston container I (D1) at the top, connecting a quick connector I (Q1) and a quick connector II (Q2), closing all valves, and opening an insulation can (M) to heat to an experimental temperature;

step two, setting the rotation angle of the first core clamping device (C1) around the first longitudinal rotating shaft (C1 g) and the first transverse rotating shaft (C1 e) according to the experimental requirements, putting the first core (C1C) into the first transparent rubber sleeve, and injecting water between the first core clamping device shell (C1 a) and the first transparent rubber sleeve (C1 b) through the first ring pressure tracker (C1 f), wherein the pressure of the injected water is the pressure value required by the experiment; in the experimental process, the first ring pressure tracker (C1 f) tracks the pressure of the inlet of the first core clamper in real time, the pressure of water between the first core clamper shell (C1 a) and the first transparent rubber sleeve (C1 b) is adjusted, and the pressure difference value between the pressure of the water between the first core clamper shell (C1 a) and the first transparent rubber sleeve (C1 b) and the pressure difference value of the inlet of the first core clamper is constant to be the pressure difference value required by the experiment;

step three, setting a first constant-speed constant-pressure pump to work in a constant-speed mode, setting a constant speed as an experimental required speed, setting a third constant-speed constant-pressure pump (A3) to work in a constant-pressure mode, setting a constant pressure as an experimental required pressure, setting a shearing speed of a shearing device (E), starting a first microscope (C1 h), a first light source (C1 j), a first camera (D1 b) and a third light source (D1D), opening a first valve (K1), a fourth valve (K4), a sixth valve (K6), an eighth valve (K8) and a ninth valve (K9), starting the shearing device (E), the first constant-speed constant-pressure pump (A1) and the third constant-speed constant-pressure pump (A3), and enabling an oil displacement agent to enter the first rock core (C1C) after being sheared by the shearing device, and then enter the top of a metering piston container (D1);

step four, shooting the micro-flowing and displacing process of the oil displacement agent in the first core (C1C) by the microscope (C1 h), shooting the volume of the oil displacement agent in the metering piston container (B1) by the camera (D1B), and closing the constant-speed constant-pressure pump (A1), the constant-speed constant-pressure pump (A3), the shearing device (E), the microscope (C1 h), the light source (C1 j), the camera (D1B), the light source (D1D) and all valves when the volume of the oil displacement agent in the metering piston container (B1) meets the experimental requirements, and ending the experiment.

10. A method for evaluating the oil-displacing agent seepage performance of the oil-displacing agent seepage performance evaluation apparatus according to claim 8, characterized by comprising the steps of:

firstly, filling an oil displacement agent into the upper part of a piston container I (B1), filling oil into the upper part of a piston container II (B2), filling gas into the upper part of a piston container III (B3), positioning pistons in a metering piston container I (D1) and a metering piston container II (D2) at the top, closing all valves, and opening a heat insulation box (M) to heat to an experimental temperature;

step two, setting the rotation angle of the first core clamping device (C1) around the first longitudinal rotating shaft (C1 g) and the first transverse rotating shaft (C1 e) according to the experimental requirements, putting the first core with saturated water into the first transparent rubber sleeve (C1 b), and injecting water between the first core clamping device shell (C1 a) and the first transparent rubber sleeve (C1 b) through the first ring pressure tracker (C1 f), wherein the pressure of the injected water is the pressure required by the experiment; in the experimental process, the first ring pressure tracker (C1 f) tracks the pressure of the inlet of the first core clamper in real time, the pressure of water between the first core clamper shell (C1 a) and the first transparent rubber sleeve (C1 b) is adjusted, and the pressure difference value between the pressure of the water between the first core clamper shell (C1 a) and the first transparent rubber sleeve (C1 b) and the pressure difference value of the inlet of the first core clamper is constant to be the pressure difference value required by the experiment;

similarly, setting the rotation angle of the core clamper II (C2) around the longitudinal rotating shaft II (C2 g) and the transverse rotating shaft II (C2 e) according to the experimental requirement, putting the core II which is saturated with water into the transparent rubber sleeve II (C2 b), and injecting water between the core clamper shell II (C2 a) and the transparent rubber sleeve II (C2 b) through the ring pressure tracker II (C2 f), wherein the pressure of the injected water is the pressure required by the experiment; in the experiment process, the second ring pressure tracker (C2 f) tracks the pressure of the inlet of the second core clamper in real time, the pressure of water between the second core clamper shell (C2 a) and the second transparent rubber sleeve (C2 b) is adjusted, and the pressure difference value between the pressure of the water between the second core clamper shell (C2 a) and the second transparent rubber sleeve (C2 b) and the pressure difference value of the inlet of the second core clamper is constant to be the pressure difference value required by the experiment;

step three, setting a first constant-speed constant-pressure pump (A1) to work in a constant-speed mode, wherein the constant speed is the oil saturation speed of the rock core required by the experiment, and setting a third constant-speed constant-pressure pump (A3) to work in a constant-pressure mode, wherein the constant pressure is the pressure required by the experiment; connecting a first quick joint (Q1) and a second quick joint (Q2), opening a second valve (K2), a fourth valve (K4), a sixth valve (K6), an eighth valve (K8) and a ninth valve (K9), starting a first constant-speed constant-pressure pump (A1) and a third constant-speed constant-pressure pump (A3) to enable oil to enter a first core (C1C) of a first core gripper, and closing the first constant-speed constant-pressure pump (A1), the third constant-speed constant-pressure pump (A3) and all valves when the volume of the oil in a metering piston container I (D1) meets the experimental requirements; disconnecting the quick connector I (Q1) and the quick connector II (Q2), opening a valve seventh (K7), starting a constant-speed constant-pressure pump III (A3) to discharge oil in a metering piston container I (D1), and then closing the constant-speed constant-pressure pump III (A3) and the valve seventh (K7);

similarly, a first constant-speed constant-pressure pump (A1) is arranged to work in a constant-speed mode, the constant speed is the oil saturation speed of the rock core required by the experiment, a fourth constant-speed constant-pressure pump (A4) is arranged to work in a constant-pressure mode, and the constant pressure is the pressure required by the experiment; connecting a first quick joint (Q1) and a second quick joint (Q2), opening a second valve (K2), a fourth valve (K4), a sixth valve (K6), a tenth valve (K10) and an eleventh valve (K11), starting a first constant-speed constant-pressure pump (A1) and a fourth constant-speed constant-pressure pump (A4) to enable oil to enter a second core (C2C) of the second core gripper, and when the volume of the oil in a metering piston container II (D2) meets the experimental requirements, closing the first constant-speed constant-pressure pump (A1), the fourth constant-speed constant-pressure pump (A4) and all valves; disconnecting the first quick joint (Q1) and the second quick joint (Q2), opening a valve seventh (K7), starting a constant-speed constant-pressure pump IV (A4) to discharge oil in a metering piston container II (D2), and then closing the constant-speed constant-pressure pump IV (A4) and the valve seventh (K7);

step four, setting a first constant-speed constant-pressure pump (A1) and a second constant-speed constant-pressure pump (A2) to work in a constant-speed mode, wherein the constant speeds are respectively required by experiments, setting a third constant-speed constant-pressure pump (A3) and a fourth constant-speed constant-pressure pump (A4) to work in a constant-pressure mode, wherein the constant pressures are required by the experiments, and setting the shearing speed of a shearing device (E); turning on a first microscope (C1 h), a first light source (C1 j), a second microscope (C2 h), a second light source (C2 j), a first camera (D1 b), a third light source (D1D), a second camera (D2 b) and a fourth light source (D2D); connecting a quick joint five (Q5) and a quick joint two (Q2), opening a valve I (K1), a valve III (K3), a valve V (K5), a valve eight (K8), a valve nine (K9), a valve ten (K10), a valve eleven (K11), a valve fourteen (K14) and a valve fifteen (K15), and opening a shearing device (E), a foam generator (F), a constant-speed constant-pressure pump I (A1), a constant-speed constant-pressure pump II (A2), a constant-speed constant-pressure pump III (A3) and a constant-speed constant-pressure pump IV (A4); the oil displacement agent and the gas form a foam system through a foam generator, the foam system is sheared by a shearing device (E) and then enters a first core (C1C) and a second core (C2C), then the fluid flowing out of the outlet end of the first core enters a first metering piston container (D1), and the fluid flowing out of the outlet end of the second core enters a second metering piston container (D2);

step five, shooting the micro flow and displacement process of the foam system in the first rock core (C1C) by a microscope I (C1 h), and shooting the micro flow and displacement process of the foam system in the second rock core (C2C) by a microscope II (C2 h); the first camera (D1 b) shoots the volumes of the oil, the gas and the oil displacement agent in the first metering piston container (D1), the second camera (D2 b) shoots the volumes of the oil, the gas and the oil displacement agent in the second metering piston container (D2), and the flow splitting rate and the recovery rate are calculated according to the volumes of the oil, the gas and the oil displacement agent;

step six, stopping the experiment after the injection amount of the oil displacement agent and the gas meets the experiment requirement, closing the shearing device (E), the foam generator (F), the first constant-speed constant-pressure pump (A1), the second constant-speed constant-pressure pump (A2), the third constant-speed constant-pressure pump (A3), the fourth constant-speed constant-pressure pump (A4), the first microscope (C1 h), the first light source (C1 j), the second microscope (C2 h), the second light source (C2 j), the first camera (D1 b), the third light source (D1D), the second camera (D2 b) and the fourth light source (D2D), and closing all valves;

and step seven, repeating the step one to the step six to respectively measure the seepage performance of the foam system flowing out of the quick connector I (Q1), the quick connector III (Q3) and the quick connector IV (Q4).

The technical field is as follows:

the invention belongs to the technical field of petroleum engineering and tertiary oil recovery, and particularly relates to a device and a method for evaluating the seepage performance of an oil displacement agent.

Background art:

two thirds of crude oil still remains underground after most of oil fields in China are subjected to water flooding, and in order to further improve the recovery ratio of the crude oil, a tertiary oil recovery technology is developed according to oil reservoirs and fluid characteristics, so that the recovery ratio can be improved by about twenty percent. The polymer flooding, ternary combination flooding, binary combination flooding, foam flooding and other technologies are widely applied to tertiary oil recovery, and the seepage performance parameters of the oil displacement agent system in the core are important bases for judging whether the technology can be applied on site or not, and are also important basic parameters for compiling the technical scheme of tertiary oil recovery.

At present, the disclosed indoor oil displacement system seepage performance evaluation device is provided with a physical simulation oil displacement device and a microcosmic oil displacement device, wherein the physical simulation oil displacement device can be used for evaluating the flow performance, the flow rate and the oil displacement effect of an oil displacement agent by using a natural rock core, an artificial rock core or sand filling, but the device cannot observe microcosmic flow and the oil displacement process, and the experimental back pressure control precision is low, so that the injection pressure is obviously fluctuated. The microcosmic oil displacement device utilizes microcosmic etched glass to replace a natural rock core, but the maximum working pressure of an experimental instrument is low, and the control precision of the experimental back pressure is low. Therefore, the existing oil displacement agent seepage performance evaluation device cannot accurately measure the seepage performance of the oil displacement agent in the core under the high-pressure condition.

The invention content is as follows:

the invention aims to provide an oil-displacing agent seepage performance evaluation device which is used for solving the problem that the existing oil-displacing agent seepage performance evaluation device cannot accurately measure the seepage performance of an oil-displacing agent in a rock core under a high-pressure condition.

The technical scheme adopted by the invention for solving the technical problems is as follows: the oil displacement agent seepage performance evaluation device comprises an injection system, a measurement system and a metering system, wherein the injection system comprises a piston container I, a piston container II, a piston container III, a foam generator, a shearing device, a simulation well bore, a quick joint I, a quick joint III, a quick joint IV and a quick joint V; the measuring system comprises a quick connector II, a core clamping device I and a core clamping device II; the metering system comprises a metering piston container I and a metering piston container II;

the top end of the simulated shaft is connected with the shearing device through a pipeline and a valve fifteen, the side face of the simulated shaft is provided with a simulated perforation I, a simulated perforation II and a simulated perforation III, the simulated perforation I is connected with a pressure gauge II, a valve twelve and a quick connector III through pipelines, the simulated perforation II is connected with the pressure gauge III, the valve thirteen and the quick connector IV through pipelines, the simulated perforation III is connected with the pressure gauge IV, the valve fourteen and the quick connector V through pipelines, and the quick connector III, the quick connector IV or the quick connector V is connected with the quick connector II of the measuring system;

the quick joint II is respectively connected with the core clamp I and the core clamp II, the core clamp I and the core clamp II are respectively provided with an inlet valve and an outlet valve, the core clamp I and the core clamp II are respectively connected with a metering piston container through the outlet valve, and the bottom end of each metering piston container is connected with a constant-speed constant-pressure pump; the quick connector II is also connected with a metering piston container through a pipeline, and a valve seventh is arranged on the pipeline;

any one core clamping device comprises a core clamping device shell, a transparent rubber sleeve and an observation window, wherein the transparent rubber sleeve is arranged inside the core clamping device shell, and a core is arranged inside the transparent rubber sleeve; the side surface of the shell of the core holder is provided with an observation window, a microscope and a light source are arranged outside the observation window, and the shell of the core holder and the transparent rubber sleeve are connected with the ring crush tracker through a pipeline; the two ends of the shell of the core clamping device are respectively connected with the transverse rotating shaft, the shell of the core clamping device can rotate around the transverse rotating shaft, the shell of the core clamping device is connected with the longitudinal rotating shaft, the shell of the core clamping device is perpendicular to the longitudinal rotating shaft, and the shell of the core clamping device can rotate around the longitudinal rotating shaft.

In the scheme, a piston container I, a piston container II and a piston container III are connected in parallel and then connected with a valve IV and a valve V which are connected in parallel, the valve V is connected with a foam generator, the valve IV and the foam generator are connected to a shearing device, the shearing device is respectively connected with a valve VI and a simulation shaft, a pressure gauge I is arranged in front of the valve VI, and the valve VI is connected with a quick connector I; the bottom end of the first piston container and the bottom end of the second piston container are both connected with a first constant-speed constant-pressure pump, the bottom end of the third piston container is connected with a second constant-speed constant-pressure pump, a first valve is arranged at the outlet of the first piston container, a second valve is arranged at the outlet of the second piston container, and a third valve is arranged at the outlet of the third piston container.

In the scheme, a first core clamping device shell is arranged outside a first core clamping device, a first transparent rubber sleeve is arranged inside the first core clamping device shell, and a first core is arranged inside the first transparent rubber sleeve; one side surface of the shell of the core clamp device is provided with a first observation window, a first microscope and a first light source are arranged outside the first observation window, and the first shell of the core clamp device and the first transparent rubber sleeve are connected with a first ring crush tracker through a pipeline; two ends of a core clamping device shell are respectively connected with the transverse rotating shaft I, and a longitudinal rotating shaft I is vertically arranged at the center of the core clamping device shell; an inlet valve of the core clamping device I is a valve eight, and an outlet valve of the core clamping device I is a valve nine;

the outer part of the core clamper II is a core clamper shell II, the inner part of the core clamper shell II is a transparent rubber sleeve II, and the inner part of the transparent rubber sleeve II is a core II; the two sides of the shell of the core clamp device are provided with a second observation window, a second microscope and a second light source are arranged outside the second observation window, and the second shell of the core clamp device and the second transparent rubber sleeve are connected with a second ring crush tracker through a pipeline; two ends of the core clamping device shell II are respectively connected with the transverse rotating shaft II, and a longitudinal rotating shaft II is vertically arranged at the center of the core clamping device shell II; the inlet valve of the core clamper II is a valve ten, and the outlet valve is a valve eleven.

In the scheme, a first observation window is arranged on one side surface of a first core clamping device shell, and a first microscope and a first light source are arranged on the same side of the outer part of the first observation window; two opposite side surfaces of the first core clamping device shell are respectively provided with a first observation window, the same side of the outer part of the first observation window is provided with a first microscope and a first light source, or two sides of the outer part of the first observation window are respectively provided with a first microscope and a first light source;

a second observation window is arranged on one side surface of the second core clamp shell, and a second microscope and a second light source are arranged on the same side of the outer part of the second observation window; two opposite side surfaces of the second core clamping device shell are respectively provided with a second observation window, the same side of the outer part of the second observation window is provided with a second microscope and a second light source, or two sides of the outer part of the second observation window are respectively provided with the second microscope and the second light source;

the first core clamping device shell, the first transparent rubber sleeve, the first rock core, the second core clamping device shell, the second transparent rubber sleeve and the second rock core are all cuboids, the width of the first rock core or the second rock core is 0.01-2.5 cm, the length of the first rock core or the second rock core is 2-30 cm, and the height of the first rock core or the second rock core is 0.5-2.5 cm, and the first rock core or the second rock core can be a natural rock core, an artificial rock core, a bailey rock core or a sand-filled rock core.

In the scheme, a first metering container shell is arranged outside a first metering piston container, a first metering container window is arranged on one side surface of the first metering container shell, a first metering container piston is arranged inside the first metering container shell, a first camera and a third light source are arranged outside the first metering container window, and the bottom of the first metering piston container is connected with a third constant-speed constant-pressure pump;

the outer part of the second metering piston container is a second metering container shell, the two side surfaces of the second metering container shell are second metering container windows, a second metering container piston is arranged in the second metering container shell, a second camera and a fourth light source are arranged outside the second metering container window, and the bottom of the second metering piston container is connected with a fourth constant-speed constant-pressure pump.

In the scheme, a first metering container window is arranged on one side surface of a first metering container shell, and a first camera and a third light source are arranged on the same side outside the first metering container window; two opposite side surfaces of the first metering container shell are respectively provided with a first metering container window, the same side of the outer part of the first metering container window is provided with a first camera and a third light source, or two sides of the outer part of the first metering container window are respectively provided with a first camera and a third light source;

a second metering container window is arranged on one side surface of the second metering container shell, and a second camera and a fourth light source are arranged on the same side outside the second metering container window; two opposite side surfaces of the second metering container shell are respectively provided with a second metering container window, the same side of the outside of the second metering container window is provided with a second camera and a fourth light source, or two sides of the outside of the second metering container window are respectively provided with a second camera and a fourth light source.

In the scheme, the simulated shaft side is provided with a simulated perforation I, a simulated perforation II and a simulated perforation III from top to bottom, the simulated perforation I is positioned at one fifth to one half of the height of the simulated shaft, the simulated perforation II is positioned at one sixth to one third of the height of the simulated shaft, and the simulated perforation III is positioned at the bottom of the simulated shaft.

In the scheme, the injection system, the measurement system and the metering system are arranged in the heat preservation box; and each constant-speed and constant-pressure pump, each pressure gauge, each foam generator, the shearing device, each microscope, each camera and each ring pressure tracker are electrically connected with a computer.

One method for evaluating the seepage performance of the oil displacement agent by the oil displacement agent seepage performance evaluation device is as follows:

step one, filling an oil displacement agent into the upper part of a piston container I, measuring the position of a piston in the piston container I at the top, connecting a quick connector I and a quick connector II, closing all valves, and opening an insulation can to heat to an experimental temperature;

step two, setting a rotation angle of the first core clamping device around the first longitudinal rotating shaft and the first transverse rotating shaft according to experimental requirements, placing the first core in the first transparent rubber sleeve, and injecting water between the first core clamping device shell and the first transparent rubber sleeve through a ring pressure tracker, wherein the pressure of the injected water is the pressure value required by the experiment; in the experiment process, a first ring pressure tracker tracks the pressure of an inlet of a first core clamping device in real time, and adjusts the pressure of water between a first core clamping device shell and a first transparent rubber sleeve to ensure that the pressure difference value between the pressure of the water between the first core clamping device shell and the first transparent rubber sleeve and the pressure difference value of the inlet of the first core clamping device is constant as the pressure difference value required by the experiment;

step three, setting a first constant-speed constant-pressure pump to work in a constant-speed mode, setting a constant speed as an experimental required speed, setting a third constant-speed constant-pressure pump to work in a constant-pressure mode, setting a shearing speed of a shearing device, starting a first microscope, a first light source, a first camera and a third light source, opening a first valve, a fourth valve, a sixth valve, an eighth valve and a ninth valve, starting the shearing device, the first constant-speed constant-pressure pump and the third constant-speed constant-pressure pump, and cutting an oil displacement agent by the shearing device, then entering a first rock core and then entering the top of a metering piston container;

and step four, shooting the micro-flowing and displacing process of the oil displacement agent in the first core by the first microscope, shooting the volume of the oil displacement agent in the first metering piston container by the first camera, and closing the first constant-speed constant-pressure pump, the third constant-speed constant-pressure pump, the shearing device, the first microscope, the first light source, the first camera, the third light source and all valves when the volume of the oil displacement agent in the first metering piston container meets the experimental requirements, and ending the experiment.

The oil displacement agent seepage performance evaluation device has the following another method for evaluating the oil displacement agent seepage performance:

step one, filling an oil displacement agent into the upper part of a piston container I, filling oil into the upper part of a piston container II, filling gas into the upper part of a piston container III, positioning pistons in a metering piston container I and a metering piston container II at the tops, closing all valves, and opening an insulation can to heat to an experimental temperature;

step two, setting a rotation angle of the first core clamping device around the first longitudinal rotating shaft and the first transverse rotating shaft according to experimental requirements, placing the first core saturated with water into the first transparent rubber sleeve, and injecting water between the first core clamping device shell and the first transparent rubber sleeve through a ring pressure tracker, wherein the pressure of the injected water is the pressure required by the experiment; in the experiment process, a first ring pressure tracker tracks the pressure of an inlet of a first core clamping device in real time, and adjusts the pressure of water between a first core clamping device shell and a first transparent rubber sleeve to ensure that the pressure difference value between the pressure of the water between the first core clamping device shell and the first transparent rubber sleeve and the pressure difference value of the inlet of the first core clamping device is constant as the pressure difference value required by the experiment;

similarly, setting the rotation angle of the second core clamping device around the second longitudinal rotating shaft and the second transverse rotating shaft according to the experimental requirements, putting the second core saturated with water into the second transparent rubber sleeve, and injecting water between the second two core clamping device shell and the second transparent rubber sleeve through the ring pressure tracker, wherein the pressure of the injected water is the pressure required by the experiment; in the experiment process, the second ring pressure tracker tracks the pressure of the inlet of the second core clamping device in real time, and adjusts the pressure of water between the second core clamping device shell and the second transparent rubber sleeve to ensure that the pressure difference between the pressure of the water between the second core clamping device shell and the second transparent rubber sleeve and the pressure difference of the inlet of the second core clamping device is constant as the pressure difference required by the experiment;

step three, setting a first constant-speed constant-pressure pump to work in a constant-speed mode, wherein the constant speed is the oil saturation speed of the rock core required by the experiment, and setting a third constant-speed constant-pressure pump to work in a constant-pressure mode, wherein the constant pressure is the pressure required by the experiment; connecting a first quick joint and a second quick joint, opening a second valve, a fourth valve, a sixth valve, an eighth valve and a ninth valve, starting a first constant-speed constant-pressure pump and a third constant-speed constant-pressure pump to enable oil to enter a first core of a first core clamping device, and closing the first constant-speed constant-pressure pump, the third constant-speed constant-pressure pump and all valves when the volume of the oil in a metering piston container I meets the experimental requirements; disconnecting the first quick joint and the second quick joint, opening a valve seventh, starting a third constant-speed constant-pressure pump to discharge oil in the first metering piston container, and then closing the third constant-speed constant-pressure pump and the valve seventh;

similarly, a first constant-speed constant-pressure pump is arranged to work in a constant-speed mode, the constant speed is the oil saturation speed of the rock core required by the experiment, a second constant-speed constant-pressure pump is arranged to work in a constant-pressure mode, and the constant pressure is the pressure required by the experiment; connecting a first quick joint and a second quick joint, opening a second valve, a fourth valve, a sixth valve, a tenth valve and a eleventh valve, starting a first constant-speed constant-pressure pump and a fourth constant-speed constant-pressure pump to enable oil to enter a second core of a second core clamping device, and closing the first constant-speed constant-pressure pump, the fourth constant-speed constant-pressure pump and all the valves when the volume of the oil in a metering piston container II meets the experimental requirements; disconnecting the first quick joint and the second quick joint, opening a valve seventh, starting a fourth constant-speed constant-pressure pump to discharge oil in the second metering piston container, and then closing the fourth constant-speed constant-pressure pump and the valve seventh;

step four, setting a first constant-speed constant-pressure pump and a second constant-speed constant-pressure pump to work in a constant-speed mode, wherein the constant speeds are respectively required by experiments, setting a third constant-speed constant-pressure pump and a fourth constant-speed constant-pressure pump to work in a constant-pressure mode, wherein the constant pressures are required by the experiments, and setting the shearing speed of the shearing device; starting a microscope I, a light source I, a microscope II, a light source II, a camera I, a light source III, a camera II and a light source IV; connecting a first quick joint and a second quick joint, opening a first valve, a third valve, a fifth valve, an eighth valve, a ninth valve, a tenth valve, a eleventh valve, a fourteenth valve and a fifteenth valve, and opening a shearing device, a foam generator, a first constant-speed constant-pressure pump, a second constant-speed constant-pressure pump, a third constant-speed constant-pressure pump and a fourth constant-speed constant-pressure pump; the oil displacement agent and the gas form a foam system through a foam generator, the foam system is sheared by a shearing device and then enters a first rock core and a second rock core, then the fluid flowing out of the outlet end of the first rock core enters a first metering piston container, and the fluid flowing out of the outlet end of the second rock core enters a second metering piston container;

step five, shooting the micro-flowing and displacement process of the foam system in the first rock core by the first microscope, and shooting the micro-flowing and displacement process of the foam system in the second rock core by the second microscope; the first camera shoots and measures the volumes of the oil, the gas and the oil-displacing agent in the first piston container, the second camera shoots and measures the volumes of the oil, the gas and the oil-displacing agent in the second piston container, and the flow splitting rate and the recovery rate are calculated according to the volumes of the oil, the gas and the oil-displacing agent;

step six, stopping the experiment when the injection amount of the oil displacement agent and the gas meets the experiment requirements, closing the shearing device, the foam generator, the first constant-speed constant-pressure pump, the second constant-speed constant-pressure pump, the third constant-speed constant-pressure pump, the fourth constant-speed constant-pressure pump, the first microscope, the first light source, the second microscope, the second light source, the first camera, the third light source, the second camera and the fourth light source, and closing all valves;

and step seven, repeating the step one to the step six to respectively measure the seepage performance of the foam system flowing out of the quick connector I, the quick connector III and the quick connector IV.

The invention has the following beneficial effects:

1. the method has the advantages that the microscopic flow and displacement process of the oil displacement agent in the core are measured under the conditions of high pressure and different oil reservoir angles, and meanwhile, the data of the flow splitting rate and the oil displacement effect can be obtained; the invention also has the advantages that under the high-pressure condition, the solution performance and the flow performance of the oil displacement agent after shaft sedimentation and perforation shearing are evaluated.

2. The constant-speed constant-pressure pump is used for controlling the back pressure, so that the device is ensured to control the back pressure more accurately and accurately, the injection pressure is stable, and the obtained experimental result is more accurate.

Drawings

FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;

FIG. 2 is a schematic side view of the core holder of the present invention;

FIG. 3 is a schematic side view of a core holder according to the present invention;

FIG. 4 is a schematic top view of the core holder of the present invention;

FIG. 5 is a schematic diagram of a side view of the core holder of the present invention rotated at a certain angle along the longitudinal axis;

FIG. 6 is a schematic diagram of a side view of the core holder of the present invention rotated at a certain angle along the transverse axis;

FIG. 7 is a schematic side view of the piston of the metering container of the present invention;

fig. 8 is a schematic diagram of the piston side structure of the metering container of the present invention.

In the figure: ZX: injection system, CX: measurement system, JX: a metering system;

a1: constant-speed constant-pressure pump one, a 2: constant-speed constant-pressure pump two, a 3: constant-speed constant-pressure pump three, a 4: constant-speed constant-pressure pump four, B1: piston container one, B2: piston container two, B3: piston container three, C1: core holder one, C2: core clamper two, D1: metering piston container one, D2: metering piston container two, E: shearing device, F: foam generator, G: simulated wellbore, G1: simulated perforation one, G2: simulated perforation two, G3: simulated perforation three, H1: pressure gauge one, H2: pressure gauge two, H3: pressure gauge three, H4: pressure gauge four, K1-K15: valves one to fifteen, M: insulation can, P: computer, Q1~ Q5: the quick connectors I to V;

c1 a: core holder shell one, C1 b: transparent rubber sleeve one, C1C: core one, C1 d: observation window one, C1 e: transverse rotating shaft one, C1 f: ring pressure tracker one, C1 g: longitudinal rotating shaft one, C1 h: microscope one, C1 i: microscope slide rail one, C1 j: light source one, C1 k: a first light source sliding track; c2 a: core holder shell two, C2 b: transparent second rubber sleeve, C2C: core two, C2 d: observation window two, C2 e: transverse rotating shaft two, C2 f: second ring pressure tracker, C2 g: longitudinal rotating shaft two, C2 h: microscope two, C2 i: microscope slide rail two, C2 j: light source two, C2 k: a light source sliding track II;

d1 a: first metering container housing, D1 b: camera one, D1 c: first camera slide rail, D1D: light source three, D1 e: light source sliding track three, D1 f: a first metering container piston; d1 g: metering container window one, D2 a: second metering container housing, D2 b: camera two, D2 c: camera slide rail two, D2D: light source four, D2 e: light source sliding track four, D2 f: metering container piston two, D2 g: and a second measuring container window.

Detailed Description

The invention is further described with reference to the accompanying drawings in which:

example 1:

as shown in figure 1, the oil displacement agent seepage performance evaluation device comprises an injection system ZX, a measurement system CX, a metering system JX, an insulation box M and a computer P, wherein a solid line in the figure represents physical pipeline connection, and a dotted line represents electric connection.

(1) Injection system ZX

The injection system ZX comprises a first constant-speed and constant-pressure pump A1, a second constant-speed and constant-pressure pump A2, a first piston container B1, a second piston container B2, a third piston container B3 and a shearing device E; the top end of the piston container I B1 is connected with the shearing device E through a pipeline, a valve I K1 and a valve IV K4, and the bottom end of the piston container I B1 is connected with the constant-speed constant-pressure pump I A1 through a pipeline. The top end of the piston container II B2 is connected with the shearing device E through a pipeline, a valve II K2 and a valve IV K4, and the bottom end of the piston container II B2 is connected with the constant-speed constant-pressure pump I A1 through a pipeline. The top end of the piston container III B3 is connected with the shearing device E through a pipeline, a valve III K3 and a valve IV K4, and the bottom end of the piston container III B3 is connected with the constant-speed constant-pressure pump II A2 through a pipeline. The shearing device E is connected with a pressure gauge I H1, a valve six K6 and a quick connector I Q1 in sequence through pipelines. The first quick coupling Q1 may be connected to the second quick coupling Q2 of the measurement system CX as required by the experiment, and if not, the first quick coupling Q1 is not connected to the second quick coupling Q2, which is in a disconnected state.

The injection system ZX comprises a first constant-speed and constant-pressure pump A1, a second constant-speed and constant-pressure pump A2, a first piston container B1, a second piston container B2, a third piston container B3, a foam generator F and a shearing device E; the top end of the first piston container B1 is connected with a shearing device E through a pipeline, a valve I K1 and a valve IV K4, or the top end of the first piston container B1 is connected with a foam generator F through a pipeline, a valve I K1 and a valve V K5, and the bottom end of the first piston container B1 is connected with a constant-speed constant-pressure pump I A1 through a pipeline. The top end of the second piston container B2 is connected with a shearing device E through a pipeline, a second valve K2 and a fourth valve K4, or the top end of the second piston container B2 is connected with a foam generator F through a pipeline, a second valve K2 and a fifth valve K5, and the bottom end of the second piston container B2 is connected with a first constant-speed and constant-pressure pump A1 through a pipeline. The top end of the piston container III B3 is connected with a shearing device E through a pipeline, a valve III K3 and a valve IV K4, or the top end of the piston container III B3 is connected with a foam generator F through a pipeline, a valve III K3 and a valve V K5, and the bottom end of the piston container III B3 is connected with a constant-speed and constant-pressure pump II A2 through a pipeline. The foam generator F is connected with a shearing device E through a pipeline, and the shearing device E is sequentially connected with a pressure gauge I H1, a valve VI K6 and a quick coupling I Q1 through pipelines. The first quick coupling Q1 may be connected to the second quick coupling Q2 of the measurement system CX as required by the experiment, and if not, the first quick coupling Q1 is not connected to the second quick coupling Q2, which is in a disconnected state.

The injection system ZX can inject oil displacement agents such as crude oil, a polymer system, a ternary composite system, a binary composite system, a gel system, a heterogeneous system, a gas system or a foam system and the like into the measuring system CX or the metering system JX. The working speeds of the first constant-speed and constant-pressure pump A1 and the second constant-speed and constant-pressure pump A2 are 0.01-10 mL/min, the working pressure is 0-40 MPa, and the pressure resistance of the first piston container B1, the second piston container B2, the third piston container B3, the foam generator F, the shearing device E, the first quick joint Q1, the pipeline and the valve is 0-40 MPa.

The injection system ZX also comprises a simulated well bore G, the top end of the simulated well bore G is connected with the shearing device E through a pipeline and a valve fifteen K15, and the side face of the simulated well bore G is provided with a simulated perforation one G1, a simulated perforation two G2 and a simulated perforation three G3 from top to bottom. The simulated perforation one G1 is at one fifth to one half of the height of the simulated wellbore G, the simulated perforation two G2 is at one sixth to one third of the height of the simulated wellbore G, and the simulated perforation three G3 is at the bottom of the simulated wellbore G. The first simulated perforation G1 is connected with a second pressure gauge H2, a valve twelve K12 and a quick connector three Q3 through pipelines, the second simulated perforation G2 is connected with a third pressure gauge H3, a valve thirteen K13 and a quick connector four Q4 through pipelines, and the third simulated perforation G3 is connected with a fourth pressure gauge H4, a valve fourteen K14 and a quick connector five Q5 through pipelines. The quick connector three Q3, the quick connector four Q4 or the quick connector five Q5 can be respectively connected with the quick connector two Q2 of the measuring system CX according to experimental needs, and if the quick connector three Q3, the quick connector four Q4 or the quick connector five Q5 are not connected with the quick connector two Q2 and are in a disconnected state.

The length of the simulated shaft G is 0.5-10 m, the inner diameter of the simulated shaft G is 0.2-15 cm, the aperture of the simulated perforation is 0.02-3 cm, and the simulated shaft G, the quick coupling, the pipeline and the valve are all resistant to pressure of 0-40 MPa. The simulated wellbore G is used for simulating separation and settlement of the oil displacement agent in the wellbore. And the simulated perforation is used for enabling the oil displacement agent to flow out of the simulated shaft, and the simulated oil displacement agent is sheared through the perforation hole of the shaft.

(2) Measuring system CX

The measuring system CX comprises a first core gripper C1, the inlet end of the first core gripper C1 is connected with a second quick connector Q2 through a pipeline and a valve eight K8, and the second quick connector Q2 is connected with the injection system ZX. The outlet end of the core clamper one C1 is connected with the top end of a metering piston container one D1 of the metering system JX through a pipeline and a valve nine K9.

As shown in fig. 2 and 4, the core gripper-C1 has a core gripper housing-C1 a outside, a core gripper housing-C1 a has a transparent rubber sleeve-C1 b inside, and a core-C1C inside the transparent rubber sleeve-C1 b. The side surface of the first core gripper shell C1a is provided with an observation window C1d, the exterior of the observation window C1d is provided with a microscope C1h and a light source C1j, and the first core gripper shell C1a and the first transparent rubber sleeve C1b are connected with a first ring-crush tracker C1f through pipelines. The magnification of the microscope C1h is 10-100 times, and a three-dimensional stereo image can be shot.

The first core clamp device shell C1a, the first transparent rubber sleeve C1b and the first core C1C are cuboids, the first core C1C is 0.01-2.5 cm in width, 2-30 cm in length and 0.5-2.5 cm in height, the first core C1C can be a natural core, an artificial core, a bailey core or a sand-filled core and the like, and the inner side size of the transparent rubber sleeve is the same as the outer side size of the core, so that the transparent rubber sleeve is tightly sleeved on the outer surface of the core. The transparent rubber sleeve provides a high-pressure displacement environment for the rock core, prevents liquid between the clamp shell and the transparent rubber sleeve from entering the rock core, and prevents an oil displacement agent from flowing through a gap between the rock core and the transparent rubber sleeve. In addition, the transparent rubber sleeve provides an observation window for measuring the micro-flowing and displacement process of the oil displacement agent on the surface and in the rock core under high pressure.

A first observation window C1d is arranged on one side surface of the first core clamp casing C1a, and a first microscope C1h and a first light source C1j are arranged on the same side outside the first observation window C1 d; two opposite side surfaces of the first core clamp casing C1a are respectively provided with a first observation window C1d, the same side outside the first observation window C1d is provided with a first microscope C1h and a first light source C1j, or two sides outside the first observation window C1d are respectively provided with a first microscope C1h and a first light source C1 j. The observation window is matched with the transparent rubber sleeve, and the microcosmic flowing and displacement processes of the oil displacement agent on the surface and inside of the rock core can be measured under the high-pressure condition.

Two opposite side surfaces of the first core clamp shell C1a are respectively provided with an observation window C1d, and when the first core C1C is 0.01-0.05 cm wide and has good light transmittance, the microscope C1h and the light source C1j are arranged on two opposite sides of the outer part of the observation window C1 d; when the core C1C has a width of 0.03-2.5 cm and poor light transmittance, the microscope C1h and the light source C1j are on the same side of the observation window C1 d. The microscope C1h can move on the microscope sliding track C1i parallel to the observation window C1d, and the light source C1j can move on the light source sliding track C1k parallel to the observation window C1d, so that the microscope can shoot the micro-flowing and displacement processes of the oil displacement agent at different positions of the rock core in the observation window.

Referring to fig. 5 and 6, two ends of the first core gripper housing C1a are respectively connected to the first transverse rotating shaft C1e, and the first core gripper housing C1a can rotate around the first transverse rotating shaft C1 e. The core holder housing C1a is vertically connected to the longitudinal axis C1g, and the core holder housing C1a is rotatable around the longitudinal axis C1 g. The first transverse rotating shaft C1e and the first longitudinal rotating shaft C1g enable the first core C1C to simulate different oil reservoir angles, and can be used for measuring seepage performance experiments of the oil displacement agent at different oil reservoir angles.

The ring pressure tracker is used for injecting water between the core clamping device shell and the transparent rubber sleeve, so that the pressure around the core is greater than the internal pressure of the core. The pressure of ware entry is put to the real-time tracking core of ring pressure tracker, adjusts the pressure of water between core holder shell and the transparent gum cover simultaneously, makes its pressure differential with the ware entry is put to the core and keeps invariable, has realized that the pressure around the core is invariable with the inside pressure differential value of core, provides accurate stable high-pressure experimental environment for the experiment, has guaranteed that the oil-displacing agent flows at core surface and inside, and does not get into the gap between core and the transparent gum cover.

The measuring system CX comprises a first core clamper C1 and a second core clamper C2, and the structure and the connection mode of the second core clamper C2 are the same as those of the first core clamper C1. The first core clamping device C1 and the second core clamping device C2 can realize the micro-flowing and displacement process of the oil displacement agent under the conditions of the same injection pressure and different cores, and can obtain the flow splitting rate and the recovery rate value at the same time.

The inlet end of the core clamper II C2 is connected with a quick connector II Q2 through a pipeline and a valve ten K10, and the quick connector II Q2 is connected with the injection system ZX. The outlet end of the core clamper II C2 is connected with the top end of a metering piston container II D2 of the metering system JX through a pipeline and a valve eleven K11.

As shown in fig. 3, the exterior of the core gripper casing C2 is core gripper housing C2a, the interior of the core gripper housing C2a is transparent rubber sleeve C2b, the interior of the transparent rubber sleeve C2b is core C2C, the side of the core gripper housing C2a is observation window C2d, the exterior of the observation window C2d is provided with microscope C2h and light source C2j, and the core gripper housing C2a and the transparent rubber sleeve C2b are connected with the ring crush tracker C2f through a pipeline. The shape and size of the core clamper shell II C2a, the transparent rubber sleeve II C2b and the core II C2C of the core clamper II C2 are the same as those of the core clamper I C1, and the core II C2C can be a natural core, an artificial core, a Bailey core or a sand-filled core and the like. The second microscope C2h has a magnification of 10-100 times, and can be used for shooting three-dimensional stereo images.

And a second observation window C2d is arranged on one side surface of the second core clamp shell C2a, and a second microscope C2h and a second light source C2j are arranged on the same side outside the second observation window C2 d. Two opposite side surfaces of the second core gripper shell C2a are respectively provided with a second observation window C2d, the same side outside the second observation window C2d is provided with a second microscope C2h and a second light source C2j, or two sides outside the second observation window C2d are respectively provided with a second microscope C2h and a second light source C2 j.

Two opposite side surfaces of the second core clamp shell C2a are respectively provided with a second observation window C2d, and when the thickness of the second core C2C is 0.01-0.05 cm and the light transmittance is good, the microscope C2h and the light source C2j are arranged on two opposite sides of the outside of the second observation window C2 d; when the thickness of the second core C2C is 0.03-2.5 cm and the light transmission is poor, the second microscope C2h and the second light source C2j are arranged on the same side of the outer portion of the second observation window C2 d. The second microscope C2h can move on the second microscope slide rail C2i parallel to the second observation window C2d, and the second light source C2j can move on the second light source slide rail C2k parallel to the second observation window C2 d.

Two ends of the second core gripper housing C2a are respectively connected with the second transverse rotating shaft C2e, and the second core gripper housing C2a can rotate around the second transverse rotating shaft C2 e. The second core gripper housing C2a is vertically connected with the second longitudinal rotating shaft C2g, and the second core gripper housing C2a can rotate around the second longitudinal rotating shaft C2 g. The second transverse rotating shaft C2e and the second longitudinal rotating shaft C2g enable the second core C2C to simulate different reservoir angles.

The first core clamping device shell C1a, the first observation window C1d, the first transparent rubber sleeve C1b, the second core clamping device shell C2a, the second observation window C2d, the second transparent rubber sleeve C2b, the second quick connector Q2, and pipelines and valves are all resistant to pressure of 0-40 MPa.

(3) Metering system JX

The metering system JX comprises a metering piston container I D1 and a constant-speed constant-pressure pump III A3, the top end of the metering piston container I D1 is connected with an outlet of a core gripper I C1 of the measuring system CX through a pipeline and a valve nine K9, and the bottom end of the metering piston container I D1 is connected with a constant-speed constant-pressure pump III A3 through a pipeline. The first metering piston container D1 is externally provided with a first metering container shell D1a, the first metering container shell D1a is internally provided with a first metering container piston D1f, the side surface of the first metering container shell D1a is provided with a first metering container window D1g, and the first metering container window D1g is externally provided with a first camera D1b and a third light source D1D.

The metering system JX comprises a first metering piston container D1, a second metering piston container D2, a third constant-pressure pump A3 and a fourth constant-pressure pump A4, the top end of the first metering piston container D1 is connected with the outlet of a first core gripper C1 of the measuring system CX through a pipeline and a valve nine K9, or the top end of the first metering piston container D1 is connected with a quick joint Q2 through a pipeline and a valve seven K7, and the bottom end of the first metering piston container D1 is connected with the third constant-pressure pump A3 through a pipeline. The top end of the metering piston container II D2 is connected with the outlet of a core clamper II C2 of the measuring system CX through a pipeline and a valve eleven K11, and the bottom end of the metering piston container II D2 is connected with a constant-speed constant-pressure pump IV A4 through a pipeline. The metering piston container is matched with the constant-speed constant-pressure pump for use, so that the outlet pressure of the measuring system can be accurately controlled, and the volume of oil, gas or/and water under a high-pressure condition can be metered.

As shown in fig. 7, the exterior of the metering piston container one D1 is a metering container housing one D1a, and the interior of the metering container housing one D1a is a metering container piston one D1 f. One side of the first metering container shell D1a is provided with a first metering container window D1g, and the same side outside the first metering container window D1g is provided with a first camera D1b and a third light source D1D. Two opposite side surfaces of the first metering container shell D1a are respectively provided with a first metering container window D1g, the same side outside the first metering container window D1g is provided with a first camera D1b and a third light source D1D, or two sides outside the first metering container window D1g are respectively provided with a first camera D1b and a third light source D1D. The first camera D1b may be movable on a first camera slide rail D1c parallel to the first metrology container window D1g, and the third light source D1D may be movable on a third light source slide rail D1e parallel to the first metrology container window D1 g.

The first measuring container window D1g is provided with scale marks, so that the accuracy and the measuring precision of measuring the volume of oil, gas or/and water are improved. The magnification of the first camera D1b is 1-20 times, and the first camera D1b and the light source three D1D can shoot an oil-water interface, an oil-gas interface or a gas-water interface when moving on the track, so that the accuracy and the metering precision of oil, gas or/and water volume are improved. The first metering container piston D1f can prevent the oil displacement agent or oil from emulsifying or mutual dissolving with the liquid in the constant-speed constant-pressure pump three A3, so that the volume of oil, gas or/and water can be metered more accurately.

The structure of the second metering piston container D2 is the same as that of the first metering piston container D1, as shown in fig. 8, a second metering container housing D2a is arranged outside the second metering piston container D2, scale marks are arranged on the second metering container window D2g, and a second metering container piston D2f is arranged inside the second metering container housing D2 a. One side of the second metering container shell D2a is provided with a second metering container window D2g, and the same side outside the second metering container window D2a is provided with a second camera D2b and a fourth light source D2D. Two opposite side surfaces of the second metering container casing D2a are respectively provided with a second metering container window D2g, the same side outside the second metering container window D2g is provided with a second camera D2b and a fourth light source D2D, or two sides outside the second metering container window D2g are respectively provided with a second camera D2b and a fourth light source D2D. The second camera D2b may move on the second camera slide rail D2c parallel to the second metrology container view D2g, and the fourth light source D2D may move on the fourth light source slide rail D2e parallel to the second metrology container view D2 g. The magnification of the second camera D2b is 1-20 times.

The metering piston container I D1, the metering piston container II D2, the constant-speed constant-pressure pump III A3, the constant-speed constant-pressure pump IV A4, the metering container shell I D1a, the metering container window I D1g, the metering container shell II D2a, the metering container window II D2g, and pipelines and valves are all resistant to pressure of 0-40 MPa.

The injection system ZX, the measurement system CX and the metering system JX are arranged in an insulation box M, and the temperature of the insulation box M can be 20-120 ℃.

The constant-speed constant-pressure pump A1, the constant-speed constant-pressure pump II A2, the constant-speed constant-pressure pump III A3, the constant-speed constant-pressure pump IV A4, the pressure gauge I H1, the pressure gauge II H2, the pressure gauge III H3, the pressure gauge IV H4, the foam generator F, the shearing device E, the microscope C1H, the microscope C2H, the camera D1b, the camera II D2b, the ring pressure tracker I C1F and the ring pressure tracker II C2F are electrically connected with the computer P, and automatic control and recording of the computer P can be achieved.

Example 2:

the method for evaluating the seepage performance of the oil displacement agent by adopting the device comprises the following steps:

step one, filling an oil displacement agent into the upper part of a piston container I B1, measuring the position of a piston in a piston container I D1 at the top, connecting a quick connector I Q1 and a quick connector II Q2, closing all valves, and opening an insulation can M to heat to an experimental temperature.

Step two, setting the rotation angle of the first core gripper C1 around the first longitudinal rotating shaft C1g and the first transverse rotating shaft C1e according to the experimental requirements, putting the first core C1C into the first transparent rubber sleeve C1b, and injecting water between the first core gripper shell C1a and the first transparent rubber sleeve C1b through the first annular pressure tracker C1f, wherein the pressure of the injected water is the pressure required by the experiment. In the experiment process, the first ring pressure tracker C1f tracks the pressure of the inlet C1 of the first core gripper in real time, the pressure of water between the first core gripper shell C1a and the first transparent rubber sleeve C1b is adjusted, and the pressure difference value between the pressure of the water between the first core gripper shell C1a and the first transparent rubber sleeve C1b and the pressure difference value of the inlet C1 of the first core gripper is constant as the pressure difference value required by the experiment.

Step three, the computer p sets a first constant-speed constant-pressure pump A1 to work in a constant-speed mode, the constant speed is the experimental required speed, the computer p sets a third constant-speed constant-pressure pump A3 to work in a constant-pressure mode, the constant pressure is the experimental required pressure, the shearing speed of the shearing device E is set, a first microscope C1h, a first light source C1j, a first camera D1b and a third light source D1D are started, a second valve K2, a fourth valve K4, a sixth valve K6, an eighth valve K8 and a ninth valve K9 are opened, the computer p starts the shearing device E, the first constant-speed constant-pressure pump A1 and the third constant-speed constant-pressure pump A3, and the oil displacement agent enters a first rock core C1C after being sheared by the shearing device E and then enters a first metering piston container D1.

Step four, the computer p controls the microscope C1h to shoot the micro-flow and displacement process of the oil displacement agent system in the rock core C1C, the computer p controls the camera D1b to shoot the volume of the oil displacement agent in the metering piston container D1, when the volume of the oil displacement agent in the metering piston container D1 meets the experimental requirements, the computer p closes the constant-speed constant-pressure pump A1, the constant-speed constant-pressure pump three A3, the shearing device E, the microscope C1h, the light source C1j, the camera D1b and the light source three D1D, closes all valves, and the experiment is ended.

Example 3:

the method for evaluating the seepage performance of the oil displacement agent by adopting the device comprises the following steps:

step one, oil displacement agent is filled in the upper part of a piston container I B1, oil is filled in the upper part of a piston container II B2, gas is filled in the upper part of a piston container III B3, pistons in a metering piston container I D1 and a metering piston container II D2 are both positioned at the top, all valves are closed, and a heat preservation box M is opened to heat to the experimental temperature.

Step two, setting the rotation angle of the first core gripper C1 around the first longitudinal rotating shaft C1g and the first transverse rotating shaft C1e according to the experimental requirements, putting the first core C1C which is saturated with water into the first transparent rubber sleeve C1b, and injecting water between the first core gripper shell C1a and the first transparent rubber sleeve C1b through the first annular pressure tracker C1f, wherein the pressure of the injected water is the pressure required by the experiment. In the experiment process, the first ring pressure tracker C1f tracks the pressure of the inlet C1 of the first core gripper, the pressure of water between the first core gripper shell C1a and the first transparent rubber sleeve C1b is adjusted in real time, and the pressure difference value between the pressure of the water between the first core gripper shell C1a and the first transparent rubber sleeve C1b and the pressure difference value of the inlet C1 of the first core gripper is constant as the pressure difference value required by the experiment.

Similarly, the rotation angle of the core clamper II C2 around the longitudinal rotating shaft II C2g and the transverse rotating shaft II C2e is set according to the experimental requirements, the core II C2C which is saturated with water is placed in the transparent rubber sleeve II C2b, the size and the type of the core II C2C are the same as those of the core I C1C, and the permeability of the core II C2C is different from that of the core I C1C. And injecting water between the core clamper outer shell II C2a and the transparent rubber sleeve II C2b through the ring pressure tracker II C2f, wherein the pressure of the injected water is the pressure required by the experiment. In the experiment process, the second ring pressure tracker C2f tracks the pressure of the inlet of the second core clamper C2, the pressure of water between the second core clamper shell C2a and the second transparent rubber sleeve C2b is adjusted in real time, and the pressure difference value between the pressure of the water between the second core clamper shell C2a and the second transparent rubber sleeve C2b and the pressure difference value of the inlet of the second core clamper C2 is constant as the pressure difference value required by the experiment.

Setting a first constant-speed and constant-pressure pump A1 to work in a constant-speed mode through a computer P, wherein the constant speed is the oil saturation speed of the rock core required by the experiment, setting a third constant-speed and constant-pressure pump A3 to work in a constant-pressure mode through the computer P, and the constant pressure is the pressure required by the experiment; connecting a first quick joint Q1 and a second quick joint Q2, opening a second valve K2, a fourth valve K4, a sixth valve K6, an eighth valve K8 and a ninth valve K9, starting a first constant-speed constant-pressure pump A1 and a third constant-speed constant-pressure pump A3 to enable oil to enter a first core C1C of a first core gripper C1, and closing the first constant-speed constant-pressure pump A1, the third constant-speed constant-pressure pump A3 and all valves when the volume of the oil in a metering piston container D1 meets the experimental requirements. And disconnecting the first quick connector Q1 and the second quick connector Q2, opening a valve seven K7, starting the constant-speed constant-pressure pump three A3 to discharge oil in the metering piston container one D1, and then closing the constant-speed constant-pressure pump three A3 and the valve seven K7.

Similarly, the computer P is used for setting a first constant-speed constant-pressure pump A1 to work in a constant-speed mode, the constant speed is the oil saturation speed of the rock core required by the experiment, the computer P is used for setting a fourth constant-speed constant-pressure pump A4 to work in a constant-pressure mode, and the constant pressure is the pressure required by the experiment; and connecting the first quick joint Q1 and the second quick joint Q2, opening a second valve K2, a fourth valve K4, a sixth valve K6, a tenth valve K10 and an eleventh valve K11, starting a first constant-speed constant-pressure pump A1 and a fourth constant-speed constant-pressure pump A4 to enable oil to enter a second core C2C of the second core gripper C2, and closing the first constant-speed constant-pressure pump A1, the fourth constant-speed constant-pressure pump A4 and all valves when the volume of the oil in the metering piston container II D2 meets the experimental requirements. And disconnecting the first quick connector Q1 and the second quick connector Q2, opening a valve seven K7, starting the constant-speed constant-pressure pump four A4 to discharge oil in the metering piston container two D2, and then closing the constant-speed constant-pressure pump four A4 and the valve seven K7.

Setting a first constant-speed constant-pressure pump A1 and a second constant-speed constant-pressure pump A2 to work in a constant-speed mode through a computer P, wherein the constant speeds are respectively required for experiments, setting a third constant-speed constant-pressure pump A3 and a fourth constant-speed constant-pressure pump A4 to work in a constant-pressure mode through the computer P, and setting the shearing speed of a shearing device E, wherein the constant pressure is required for the experiments; the method comprises the steps of starting a first microscope C1h, a first light source C1j, a second microscope C2h, a second light source C2j, a first camera D1b, a third light source D1D, a second camera D2b and a fourth light source D2D. Connecting a quick joint five Q5 and a quick joint two Q2, opening a valve one K1, a valve three K3, a valve five K5, a valve eight K8, a valve nine K9, a valve ten K10, a valve eleven K11, a valve fourteen K14 and a valve fifteen K15, and opening a shearing device E, a foam generator F, a constant-speed constant-pressure pump one A1, a constant-speed constant-pressure pump two A2, a constant-speed constant-pressure pump three A3 and a constant-speed constant-pressure pump four A4 through a computer P. And the oil displacement agent and the gas form a foam system through a foam generator F, the foam system is sheared by a shearing device E and then enters a first core C1C and a second core C2C, then the fluid flowing out of an outlet end of the first core C1C enters a first metering piston container D1, and the fluid flowing out of an outlet end of the second core C2C enters a second metering piston container D2.

Fifthly, the micro flow and displacement process of the foam system in the first rock core C1C is shot by the first computer P control microscope C1h, and the micro flow and displacement process of the foam system in the second rock core C2C is shot by the second computer P control microscope C2 h; the volume of the oil, gas and oil displacement agent in the metering piston container I D1 is shot by the computer P control camera I D1b, the volume of the oil, gas and oil displacement agent in the metering piston container II D2 is shot by the computer P control camera II D2b, and the flow splitting rate and the recovery rate are calculated according to the volume of the oil, gas and oil displacement agent.

And step six, stopping the experiment after the injection amount of the oil displacement agent and the gas meets the experiment requirements, closing all valves by using a computer P, and closing a shearing device E, a foam generator F, a first constant-speed constant-pressure pump A1, a second constant-speed constant-pressure pump A2, a third constant-speed constant-pressure pump A3, a fourth constant-speed constant-pressure pump A4, a first microscope C1h, a first light source C1j, a second microscope C2h, a second light source C2j, a first camera D1b, a third light source D1D, a second camera D2b and a fourth light source D2D.

And step seven, repeating the step one to the step six to respectively measure the seepage performance of the foam system flowing out of the quick connector I Q1, the quick connector III Q3 and the quick connector IV Q4.

Example 4:

the method for evaluating the seepage performance of the oil displacement agent by adopting the device comprises the following steps:

step one, filling an oil displacement agent into the upper part of a piston container II B1, measuring the position of a piston in a piston container I D1 at the top, connecting a quick connector I Q1 and a quick connector II Q2, closing all valves, and opening an insulation can M to heat to an experimental temperature;

step two, the computer P sets a first constant-speed and constant-pressure pump A1 to work in a constant-speed mode, the constant speed is the experimental required speed, the computer P sets a third constant-speed and constant-pressure pump A3 to work in a constant-pressure mode, the constant pressure is the experimental required pressure, the shearing speed of a shearing device E is set, and a first valve K1, a fourth valve K4, a sixth valve K6 and a seventh valve K7 are opened;

step three, the computer P starts a shearing device E, a constant-speed constant-pressure pump A1, a constant-speed constant-pressure pump III A3, a camera I D1b and a light source III D1D, and an oil displacement agent enters a metering piston container I D1 after passing through the shearing device E;

step four, shooting the microscopic state of the oil displacement agent system in the metering piston container I D1 by controlling a camera I D1b through a computer P, closing a shearing device E, a constant-speed constant-pressure pump I A1 and a constant-speed constant-pressure pump III A3 when the volume of the oil displacement agent system in the metering piston container I D1 meets the experimental requirements, closing all valves, disconnecting a quick joint I Q1 and a quick joint II Q2, and discharging the oil displacement agent in the metering piston container I D1;

and step five, opening a valve I K1, a valve IV K4, a valve IV K15, a valve IV K12 and a valve IV K7, connecting a quick joint III Q3 and a quick joint II Q2, starting a shearing device E, a constant-speed constant-pressure pump I A1 and a constant-speed constant-pressure pump III A3, enabling the oil displacement agent to enter a simulated shaft G through the shearing device E, then enabling the oil displacement agent to flow out through a simulated perforation I G1, enabling the oil displacement agent to enter a metering piston container I D1 through a pipeline, a valve IV K12 and a valve IV K7, and repeating the step four to measure the microscopic state of the oil displacement agent.

And step six, sequentially measuring the micro states of the oil displacement agent flowing out of the simulated perforation two G2 and the simulated perforation three G3 according to the operation of the step five.

In addition, if other special requirements exist in the experiment, the oil displacement agent seepage performance evaluation device and the evaluation method can be adjusted according to actual conditions so as to meet the experiment requirements.