阅读说明：本技术 一种二氧化碳驱油与封存中测量二氧化碳运移规律的装置与方法 (Device and method for measuring carbon dioxide migration rule in carbon dioxide flooding and sequestration ) 是由 李健 温庆志 种珊 杨富康 于 2019-09-18 设计创作，主要内容包括：本发明涉及油气田开发与二氧化碳埋存的技术领域,具体为一种二氧化碳驱油与封存中测量二氧化碳运移规律的装置与方法,包括注入系统、密封腔夹持系统和信息采集系统,密封腔夹持系统内部模拟地层条件,其上方设置有与地层底部连通的注入井和生产井；注入系统连接于密封腔加持系统并注入一定量的二氧化碳,生产井用于向外部排出原油；信息采集系统包括气体探测器和信息数据处理计算机,气体探测器与信息数据处理计算机信号连接,能够模拟并得出二氧化碳的运移规律,并在二氧化碳的扩散范围达到泄露阈值时进行实时封堵,并对该封堵技术进行评判,对实际生产防止二氧化碳泄露和封存具有重要意义。(the invention relates to the technical field of oil and gas field development and carbon dioxide sequestration, in particular to a device and a method for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration, wherein the device comprises an injection system, a sealed cavity clamping system and an information acquisition system, the sealed cavity clamping system internally simulates the stratum condition, and an injection well and a production well which are communicated with the bottom of the stratum are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity clamping system and injects a certain amount of carbon dioxide, and the production well is used for discharging crude oil to the outside; the information acquisition system comprises a gas detector and an information data processing computer, the gas detector is in signal connection with the information data processing computer, the migration rule of the carbon dioxide can be simulated and obtained, the carbon dioxide is blocked in real time when the diffusion range of the carbon dioxide reaches a leakage threshold value, the blocking technology is judged, and the method has important significance for preventing the carbon dioxide from being leaked and sealed in actual production.)

1. a device for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration comprises an injection system, a sealed cavity clamping system and an information acquisition system, wherein the sealed cavity clamping system is filled with sand, crude oil and formation water to simulate the formation conditions, and an injection well (10) and a production well (11) which are communicated with the bottom of the formation are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity holding system and injects a certain amount of carbon dioxide through the injection well (10), and the production well (11) is used for discharging crude oil to the outside; the information acquisition system comprises gas detectors (17) and an information data processing computer (16), wherein the gas detectors (17) are uniformly distributed in the inner space of the seal box clamping system, and the gas detectors (17) are in signal connection with the information data processing computer (16).

2. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 1, characterized in that: the injection system include among carbon dioxide container (8), surfactant intermediate container (7), advection pump No. two (6) and six-way valve No. two (9), this carbon dioxide intermediate container (8) and this surfactant intermediate container (7) bottom are connected in this advection pump No. two (6), and the top is connected in six-way valve No. two (9), six-way valve No. two (9) connect injection well (10) in sealed chamber clamping system, advection pump No. two (6) connect carbon dioxide intermediate container (8), inject carbon dioxide into injection well (10) in sealed chamber clamping system in, and connect surfactant intermediate container (7).

3. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 2, characterized in that: the device comprises a sealed cavity clamping system, a saturated system, an air compressor, a horizontal flow pump I (4), a six-way valve I (5), a horizontal flow pump I (1), a horizontal flow pump II (2), a horizontal flow pump I (4), a horizontal flow pump II (5), a horizontal flow pump I (4), a horizontal flow pump II (5), a horizontal flow pump II (3), a horizontal flow pump II (5), a horizontal flow pump; the first six-way valve (5) is connected to the sealing cavity clamping system.

4. The apparatus for measuring carbon dioxide migration law in carbon dioxide flooding and sequestration according to claim 3, wherein: furthermore, the sealed cavity clamping system internally comprises a stratum water system (18), a crude oil system (19) and a soil system (20).

5. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 4, wherein: the production well (11) external connection recovery metering system connect in sealed chamber clamping system, the recovery metering system include oil-gas separation counter (15), six-way valve No. three (14) connect in production well (11), oil-gas separation counter (15) be connected with six-way valve No. three (14).

6. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 5, wherein: the sealing cavity clamping system is arranged in the constant temperature control box and comprises a sealing cavity clamping device (12) and a confining pressure tracking pump (13), the sealing cavity clamping device (12) is a box body, and the confining pressure tracking pump (13) is connected to the bottom of the sealing cavity clamping device (12).

7. a use method of a device for measuring a carbon dioxide migration rule in carbon dioxide flooding and sequestration comprises the following steps:

Step 1, adding sand with a specific mesh number into a sealed cavity holder (12);

Step 2, a saturation system is adopted to perform saturated formation water, saturated crude oil and saturated air on the sealed cavity clamping system;

step 3, injecting a certain amount of carbon dioxide from an injection well (10) by using an injection system;

Step 4, recording the variable quantities of water production, oil production and gas production at different moments through an extraction metering system;

Step 5, the migration rule of the carbon dioxide is proved and counted through an information acquisition system;

and 6, when the carbon dioxide reaches the leakage level, injecting a surfactant solution into the injection well (10) through an injection system to block the carbon dioxide.

8. The use method of the device for measuring the carbon dioxide migration law in the carbon dioxide flooding and sequestration according to claim 7, characterized in that: in the step 1, sand with a specific mesh number is selected to fill the sealed cavity according to the porosity, the permeability and the oil-water-oil-gas saturation of the target block.

In step 2, the formation water is saturated through the formation water intermediate container (1) in the saturation system to the formation water layer in the sealed cavity holder (12), and the crude oil is saturated through the crude oil intermediate container (2) in the saturation system to the crude oil layer in the sealed cavity holder (12). And air saturation is carried out on the air layer system in the sealed cavity holder (12) through an air compressor (3) in the saturation system, and after a certain pressure is reached, air tightness inspection is carried out.

In step 3, a quantity of carbon dioxide is injected into an injection well (10) in the sealed chamber gripping system through a carbon dioxide intermediate vessel (8) in the injection system.

in step 4, oil, gas and water are produced from a production well (11) in the sealed cavity clamping system and led to a recovery metering system, and the variable quantities of water production, oil production and gas production at different moments are recorded through the recovery metering system.

In step 5, the content change of carbon dioxide at different positions in the sealed cavity clamping system is obtained through a gas detector (17) in the sealed cavity clamping system. And wirelessly transmits the carbon dioxide to an information acquisition system to find out and count the migration rule of the carbon dioxide.

In step 6, the migration rule of the carbon dioxide is obtained through the information acquisition system, and when the diffusion range of the carbon dioxide reaches a leakage threshold value, a surfactant solution is injected into an injection well (10) in the sealed cavity clamping system through a surfactant intermediate container (7) in the injection system. The large channel in which carbon dioxide is easy to diffuse is blocked in a foam form, so that the carbon dioxide is prevented from being leaked continuously, the distribution rule of the carbon dioxide in the information acquisition system is observed, and whether the blocking technology reaches the expected standard or not is judged.

9. A data processing method of a device for measuring carbon dioxide migration law in carbon dioxide flooding and sequestration comprises the following steps: the method comprises the following steps:

1) Outputting data of the change of the concentration of the carbon dioxide measured by the gas detector (17) along with the time;

2) Determining the three-dimensional coordinates of a gas detector (17) and the three-dimensional coordinates of an injection well (10) and a production well;

3) Obtaining carbon dioxide concentration data of each gas detector (17) in the sealed cavity system at a certain time t 0;

4) The size of concentration data is represented by the shade of color through the three-dimensional coordinates of the gas detector (17), and a three-dimensional carbon dioxide concentration field diagram in the sealing ring system at a certain moment can be obtained;

5) establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between a time axis T and the different moments T;

6) The change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.

Technical Field

The invention belongs to the technical field of oil and gas field development and carbon dioxide sequestration, and mainly relates to a device and a method for measuring a carbon dioxide migration rule in carbon dioxide flooding and sequestration.

Background

Carbon dioxide flooding has become an important development tool for tertiary oil recovery. The widespread use of carbon dioxide in petroleum is mainly due to several advantages. Firstly, the carbon dioxide can effectively supplement stratum energy, and the problems of difficult water injection, high water content rising speed and the like of the low-permeability reservoir are solved. And the carbon dioxide has high solubility in the crude oil, so that the viscosity of the crude oil can be effectively reduced, and the flow property of the crude oil is improved. Finally, the carbon dioxide can be mixed with the crude oil under certain pressure, so that the reservoir condition is improved, and the recovery degree of the crude oil is greatly improved.

Carbon dioxide capture and sequestration are one of the main measures for reducing the emission of carbon dioxide into the atmosphere and relieving global warming. Since carbon dioxide may leak through pores in the cap rock, faults or fractures in the geological formation, abandoned wells or drilled wells, etc., carbon dioxide stored in deep formations migrates upward under high pressure and buoyancy to invade shallow groundwater, thereby affecting shallow groundwater quality. Therefore, the carbon dioxide flooding and sequestration technology gradually becomes a non-negligible technical challenge in the petroleum industry.

Disclosure of Invention

The invention aims to provide a device and a method for measuring carbon dioxide migration rules in carbon dioxide oil displacement and sequestration, which can simulate the oil displacement process, geological conditions, simulation of the migration and leakage of carbon dioxide among wells, carbon dioxide and miscible phases after the occurrence of the carbon dioxide and the miscible phases in an oil field displacement process, observe the migration rules and the diffusion range of the carbon dioxide through data acquisition and processing, perform real-time plugging when the diffusion range of the carbon dioxide reaches a leakage threshold value, judge the plugging technology and have important significance for preventing the carbon dioxide leakage and sequestration in actual production.

In order to achieve the purpose, the invention provides the following technical scheme: a device for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration comprises an injection system, a sealed cavity clamping system and an information acquisition system, wherein the sealed cavity clamping system is filled with sand, crude oil and formation water to simulate the formation conditions, and an injection well and a production well which are communicated with the bottom of the formation are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity holding system and injects a certain amount of carbon dioxide through the injection well, and the production well is used for discharging crude oil to the outside; the information acquisition system comprises gas detectors and an information data processing computer, wherein the gas detectors are uniformly distributed in the inner space of the seal box clamping system, and the gas detectors are in signal connection with the information data processing computer.

Furthermore, the injection system comprises a carbon dioxide intermediate container, a surfactant intermediate container, a constant flow pump II and a six-way valve II, wherein the bottoms of the carbon dioxide intermediate container and the surfactant intermediate container are connected with the constant flow pump II, and the top of the carbon dioxide intermediate container and the surfactant intermediate container is connected with the six-way valve II. The six-way valve No. two is connected to an injection well in a seal chamber gripping system. The surfactant intermediate container stores surfactant solution which is easily obtained in a target area and has better foaming performance. The advection pump is connected with the carbon dioxide intermediate container in number two, the carbon dioxide is injected into the injection well in the sealed cavity clamping system, the surfactant intermediate container is connected, and the surfactant solution is injected into the injection well in the sealed cavity clamping system.

Furthermore, a saturation system is connected to the outside of the sealing cavity clamping system, the saturation system comprises a formation water intermediate container, a crude oil intermediate container, an air compressor, a first advection pump and a first six-way valve, the bottoms of the formation water intermediate container and the crude oil intermediate container are connected to the first advection pump, the top of the formation water intermediate container and the crude oil intermediate container is connected to the first six-way valve, and the air compressor is connected to the first six-way valve; the first six-way valve is connected to the sealing cavity clamping system. The formation water intermediate container is used for storing formation water of a target area, and the crude oil intermediate container is used for storing crude oil of the target area; the constant-current pump I is connected with the stratum water intermediate container to inject stratum water into the sealed cavity clamping system, and connected with the crude oil intermediate container to inject stratum crude oil into the sealed cavity clamping system to saturate stratum water, saturated crude oil and saturated air to the sealed cavity clamping device.

furthermore, the sealed cavity clamping system comprises a stratum water layer system, a crude oil layer system and a soil layer system. The distribution of a production well, an injection well, a gas detector, a stratum water layer system, a crude oil layer system and a soil layer system can be observed from the vertical direction. The injection well is perforated at the crude oil formation and the production well is perforated at the crude oil formation.

Furthermore, the production well is externally connected with a recovery metering system which is connected with the sealing cavity clamping system, the recovery metering system comprises an oil-gas separation meter and a six-way valve III, the six-way valve III is connected with the production well, and the oil-gas separation meter is connected with the six-way valve III and used for metering the variation of water production, oil production and gas production in the recovery process.

Furthermore, the sealed cavity clamping system is arranged in the constant temperature control box and comprises a sealed cavity clamp and a confining pressure tracking pump, wherein the sealed cavity clamp is a box body, sand is arranged in the sealed cavity clamp to simulate the stratum environment, the confining pressure tracking pump is connected to the bottom of the sealed cavity clamp, and the confining pressure tracking pump pumps water into a confining pressure cavity in the sealed cavity clamping system and gives stratum pressure through confining pressure. Confining pressure needs exist to meet formation pressures in different test environments.

A use method of the device for measuring the carbon dioxide migration law in the carbon dioxide flooding and sequestration comprises the following steps:

Step 1, filling a simulated stratum: sand of a specified mesh size is added to the capsule holder.

Step 2, simulating a saturated stratum environment: and a saturation system is adopted to carry out saturated formation water, saturated crude oil and saturated air on the sealed cavity clamping system.

Step 3, injecting a certain amount of carbon dioxide from an injection well by adopting an injection system for carbon dioxide flooding; the invention can realize the observation of the migration rule of the carbon dioxide in the carbon dioxide flooding process.

Step 4, recording the variable quantities of water production, oil production and gas production at different moments through an extraction metering system; in the carbon dioxide flooding process, the migration rule of carbon dioxide is observed along with the changes of oil production, gas production and water production in the crude oil exploitation process. The statistic of the produced quantity change is to make certain contrast and technical support for the oil displacement and sequestration of the carbon dioxide in the oil field, and a carbon dioxide migration field diagram at the moment of the produced degree can be obtained by observing the produced quantity change and the carbon dioxide migration path in different periods. And observing the migration and diffusion rules of the carbon dioxide in the stratum water layer system and the soil layer system in different periods in the process of the leakage of the carbon dioxide in the reservoir. Excessive diffusion in the water system may lead to increased water production, and excessive migration in the soil system may lead to decreased oil production. Therefore, the oil field can judge the migration condition of the carbon dioxide in the stratum by observing the change and the proportion of the produced quantity (including oil production, gas production and water production).

step 5, the migration rule of the carbon dioxide is proved and counted through an information acquisition system; and outputting the data of the concentration of the carbon dioxide measured by the gas detector along with the change of the concentration of the carbon dioxide along with the time. Carbon dioxide concentration data for each gas detector in the sealed chamber system at a time t0 may be obtained. The three-dimensional carbon dioxide concentration field diagram (and the concentration data values corresponding to different colors) in the sealing ring system at a certain moment can be obtained by representing the size of the concentration data by the color depth through the three-dimensional coordinates of the gas detector. And establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between the time axis T and the different moments T. The change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.

And 6, when the carbon dioxide reaches the leakage level, injecting a surfactant solution into the injection well through the injection system to block the carbon dioxide, wherein the leakage standards in different simulated environments are different from the specific judgment standard of 10-100ppm, and the concentration of the carbon dioxide in the local surface gas detector is more than 10ppm, so that the carbon dioxide can be judged to reach the leakage level.

in the step 1, sand with a specific mesh number is selected to fill the sealed cavity according to the porosity, the permeability and the oil-water-oil-gas saturation of the target block.

In step 2, the formation water is saturated to the formation water layer in the sealed cavity holder through the formation water intermediate container in the saturation system, and the crude oil is saturated to the crude oil layer in the sealed cavity holder through the crude oil intermediate container in the saturation system. And air saturation is carried out on the air layer system in the sealed cavity holder through an air compressor in the saturation system, and the air tightness is checked after a certain pressure is reached.

In step 3, a quantity of carbon dioxide is injected into an injection well in the sealed chamber gripping system through a carbon dioxide intermediate vessel in the injection system.

In step 4, the production well in the oil, gas and water sealing cavity clamping system is produced and led to a recovery metering system. And recording the variable quantities of water production, oil production and gas production at different moments by an extraction metering system.

In step 5, the content change of carbon dioxide at different positions in the sealed cavity clamping system is obtained through the gas detector in the sealed cavity clamping system. And wirelessly transmits the carbon dioxide to an information acquisition system to find out and count the migration rule of the carbon dioxide.

in step 6, the migration rule of the carbon dioxide is obtained through the information acquisition system. When the diffusion range of the carbon dioxide reaches a leakage threshold, a surfactant solution is injected into an injection well in the sealed chamber gripping system through a surfactant intermediate reservoir in the injection system. The large channel which is easy to diffuse carbon dioxide is blocked in a foam form, so that the carbon dioxide is prevented from continuously leaking. And meanwhile, observing the distribution rule of carbon dioxide in the information acquisition system, and judging whether the plugging technology reaches the expected standard.

A data processing method for measuring the carbon dioxide migration rule in the carbon dioxide flooding and sequestration comprises the following steps: the method comprises the following steps:

1) and outputting the data of the concentration of the carbon dioxide measured by the gas detector along with the change of the concentration of the carbon dioxide along with the time.

2) And determining the three-dimensional coordinates of the gas detector and the three-dimensional coordinates of the injection well and the production well.

3) And obtaining carbon dioxide concentration data of each gas detector in the sealed cavity system at a certain time t 0.

4) the three-dimensional carbon dioxide concentration field diagram (and the concentration data values corresponding to different colors) in the sealing ring system at a certain moment can be obtained by representing the size of the concentration data by the color depth through the three-dimensional coordinates of the gas detector.

5) and establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between the time axis T and the different moments T.

6) the change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.

Compared with the prior art, the invention has the beneficial effects that:

1. the simulation of the carbon dioxide displacement, the carbon dioxide diffusion and the carbon dioxide plugging process is realized, and the comprehensive process simulation is realized for the implementation of the carbon dioxide displacement and the carbon dioxide plugging on site.

2. the migration rule and the diffusion range of the carbon dioxide are observed in the carbon dioxide displacement process, the carbon dioxide is blocked in real time when the diffusion range of the carbon dioxide reaches the leakage threshold value, and the blocking technology is judged.

3. and observing the migration and diffusion rules of the carbon dioxide in the stratum water layer system and the soil layer system at different periods in the process of the leakage of the carbon dioxide in the reservoir. Excessive diffusion in the water system may lead to increased water production, and excessive migration in the soil system may lead to decreased oil production. Therefore, the oil field can judge the migration condition of the carbon dioxide in the stratum by observing the change and the proportion of the produced quantity (including oil production, gas production and water production).

4. The simulation of the carbon dioxide migration process under different well pattern conditions and different geological conditions is realized. By adjusting the position relation of the water layer system, the crude oil layer system and the soil layer system, process simulation of complex geological conditions including different deposition rhythmicity, fracture zones and the like and process simulation of different development modes under different geological conditions can be obtained.

Drawings

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic diagram of a saturation system according to the present invention;

FIG. 3 is a schematic view of the injection system of the present invention;

FIG. 4 is a schematic diagram of a capsule clamping system of the present invention;

FIG. 5 is a schematic diagram of the stoping metering system of the present invention;

FIG. 6 is a schematic structural diagram of an information acquisition system according to the present invention;

FIG. 7 is a top view of the interior of the capsule clamping system of the present invention;

FIG. 8 is a side view of the interior of the capsule clamping system of the present invention;

FIG. 9 is a cross-sectional view showing the distribution of carbon dioxide concentration when carbon dioxide leaks out in a soil layer by means of Tough software;

FIG. 10 is a cross-sectional view showing the distribution of carbon dioxide concentration during the carbon dioxide flooding process according to the present invention.

In the figure: 1. the system comprises a formation water intermediate container, 2, a crude oil intermediate container, 3, an air compressor, 4, a first advection pump, 5, a first six-way valve, 6, a second advection pump, 7, a surfactant intermediate container, 8, a carbon dioxide intermediate container, 9, a second six-way valve, 10, an injection well, 11, a production well, 12, a sealing cavity clamp, 13, a confining pressure tracking pump, 14, a third six-way valve, 15, an oil-gas separation meter, 16, an information data processing computer, 17, a gas detector, 18, a formation water layer system, 19, a crude oil layer system, 20 and a soil layer system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to the drawings in the figures 1-10,