阅读说明：本技术 致密岩心内的流体检测方法及装置 (Method and device for detecting fluid in tight rock core ) 是由 陈挺 杨正明 骆雨田 齐丹 熊生春 于 2020-05-07 设计创作，主要内容包括：本申请提供了一种致密岩心内的流体检测方法及装置,该方法包括：获取经洗油处理后的目标致密岩心的物性参数；将所述目标致密岩心设置在核磁设备夹持器内并分别获取沿该目标致密岩心轴向方向的至少一个截面的饱和水核磁分层T2谱图、饱和油核磁分层T2谱图和氘水驱油核磁分层T2谱图,其中,该氘水驱油核磁分层T2谱图为对该目标致密岩心进行核磁氘水驱油过程中的该截面的核磁分层T2谱图；应用所述物性参数、饱和水核磁分层T2谱图、饱和油核磁分层T2谱图和氘水驱油核磁分层T2谱图对目标致密岩心进行流体检测。本申请能够实现对致密岩心不同截面进行流体检测,检测过程高效且可靠。(The application provides a method and a device for detecting fluid in a tight rock core, wherein the method comprises the following steps: obtaining physical property parameters of the target compact rock core after oil washing treatment; the target compact rock core is arranged in a nuclear magnetic equipment holder, and a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core are respectively obtained, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core; and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram. The fluid detection can be carried out on different sections of the compact rock core, and the detection process is efficient and reliable.)

1. A method of fluid testing in a tight core, comprising:

obtaining physical property parameters of the target compact rock core after oil washing treatment;

the target compact rock core is arranged in a nuclear magnetic equipment holder, and a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core are respectively obtained, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core;

and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

2. The method for fluid detection in a tight rock core according to claim 1, wherein the fluid detection of the target tight rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium water flooding nuclear magnetic stratification T2 spectrogram comprises the following steps:

obtaining the initial oil saturation of the target compact rock core by applying a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram;

obtaining the core recovery ratio and the core residual oil saturation of the target compact core by applying the pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-flooding nuclear magnetic stratification T2 spectrogram;

and determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

3. The method for detecting fluid in a tight core according to claim 1, wherein the obtaining of the T2 spectrum, the T2 spectrum and the T2 spectrum of the saturated oil nuclear magnetic stratification, respectively, of at least one cross section along the axial direction of the target tight core comprises:

performing saturated water treatment on the target compact rock core subjected to oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state;

performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state;

and performing nuclear magnetic deuterium displacement on the target compact rock core treated by saturated oil, and generating a deuterium displacement nuclear magnetic stratification T2 spectrogram of the cross section in the nuclear magnetic deuterium displacement process.

4. The method of fluid testing in a tight core according to claim 1, further comprising:

and detecting the position and the form of the water flooding front edge in the target compact rock core by using the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

5. The method of fluid testing in a tight core according to claim 1, further comprising:

and performing nuclear magnetic resonance imaging treatment on the cross section in the nuclear magnetic resonance deuterium displacement process.

6. A fluid testing apparatus in a tight core, comprising:

the physical property parameter acquisition module is used for acquiring the physical property parameters of the target compact rock core after the oil washing treatment;

the acquisition nuclear magnetic stratification T2 spectrogram module is used for arranging the target compact rock core in a nuclear magnetic equipment holder and respectively acquiring a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one cross section along the axial direction of the target compact rock core, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is a nuclear magnetic stratification T2 spectrogram of the cross section in a nuclear magnetic deuterium flooding process of the target compact rock core;

and the fluid detection module is used for carrying out fluid detection on the target compact rock core by applying the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

7. The apparatus of claim 6, wherein the fluid detection module comprises:

an initial oil saturation unit is obtained and used for obtaining the initial oil saturation of the target compact rock core by applying a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram;

a recovery factor and residual saturation unit, configured to apply the pre-acquired nuclear magnetic spectrum curve of the instrument base signal, a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium water flooding nuclear magnetic stratification T2 spectrogram to obtain a core recovery factor and a core residual oil saturation of the target dense core;

and the fluid distribution change unit is used for determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

8. The apparatus for detecting fluid in tight rock core according to claim 6, wherein said module for obtaining nuclear magnetic stratification T2 spectrum comprises:

acquiring a saturated water nuclear magnetic stratification T2 spectrogram unit, wherein the saturated water nuclear magnetic stratification T2 spectrogram unit is used for performing saturated water treatment on the target compact rock core after oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state;

acquiring a saturated oil nuclear magnetic stratification T2 spectrogram unit, wherein the saturated oil nuclear magnetic stratification T2 spectrogram unit is used for performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state;

and obtaining a deuterium-water flooding nuclear-magnetism layering T2 spectrogram unit, wherein the deuterium-water flooding nuclear-magnetism layering T2 spectrogram unit is used for performing nuclear-magnetism deuterium-water flooding on the target compact rock core after saturated oil treatment, and generating a deuterium-water flooding nuclear-magnetism layering T2 spectrogram of the cross section in the nuclear-magnetism deuterium-water flooding process.

9. The apparatus for testing fluids in a tight core according to claim 6, further comprising:

and the module for acquiring the position and the shape of the water flooding front edge is used for detecting the position and the shape of the water flooding front edge in the target compact rock core by applying the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

10. The apparatus for testing fluids in a tight core according to claim 6, further comprising:

and the nuclear magnetic resonance imaging module is used for performing nuclear magnetic resonance deuterium displacement on the target compact rock core after saturated oil, and performing nuclear magnetic resonance imaging treatment on the cross section in the nuclear magnetic resonance deuterium displacement process.

11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method of fluid detection in tight rock centers of any of claims 1 to 5.

12. A computer readable storage medium having computer instructions stored thereon which, when executed, implement the method of fluid detection in tight rock centers of any of claims 1 to 5.

Technical Field

The application relates to the technical field of tight oil reservoirs, in particular to a method and a device for detecting fluid in a tight rock core.

Background

Because the permeability of the tight oil reservoir is extremely low and the non-Darcy seepage is obvious, the accurate determination of the internal fluid content, particularly the mobile fluid content, is extremely important.

A common holder is applied to a conventional core physical simulation experiment, the extraction degree of the core is measured through a balance or a test tube, and the measuring result precision is low. Along with the development of a compact oil reservoir, the porosity and permeability of a core subjected to an experiment are continuously reduced, and the precision of a conventional metering means cannot meet the requirement of the current experiment precision. Therefore, methods for measuring fluids inside the core using low-field nuclear magnetic resonance technology are gradually developed. The conventional nuclear magnetic resonance test requires that a core in an experiment is taken out from a holder for testing, so that the environment of the core is no longer high-temperature and high-pressure environment when the core detects internal fluid, and the loss of the internal fluid is caused.

The core online nuclear magnetic resonance physical simulation technology combines a low-field nuclear magnetic resonance testing technology with a core high-temperature high-pressure displacement physical simulation experiment technology, utilizes online nuclear magnetic equipment to calculate physical parameters such as oil saturation and the like of a core in a high-temperature high-pressure state through testing a T2 spectrum, and can perform nuclear magnetic resonance imaging analysis on the distribution condition of fluid in the core. However, the conventional T2 spectrum test is used for testing the nuclear magnetic signal of the whole core, and cannot accurately test the nuclear magnetic data of the water flooding front edge part. Although nuclear magnetic resonance imaging can test fluid distribution of different layers of the rock core, the precision is extremely low (the resolution is less than 0.1mm), and the requirement of a compact rock core mainly comprising micro-nano pores is difficult to meet.

Disclosure of Invention

Aiming at the problems in the prior art, the application provides a method and a device for detecting fluid in a compact rock core, which can realize fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable.

In order to solve the technical problem, the present application provides the following technical solutions:

in a first aspect, the present application provides a method of fluid testing in a tight core, comprising:

obtaining physical property parameters of the target compact rock core after oil washing treatment;

the target compact rock core is arranged in a nuclear magnetic equipment holder, and a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core are respectively obtained, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core;

and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Further, the fluid detection of the target compact rock core by using the physical property parameter, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram comprises: obtaining the initial oil saturation of the target compact rock core by applying a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram; obtaining the core recovery ratio and the core residual oil saturation of the target compact core by applying the pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-flooding nuclear magnetic stratification T2 spectrogram; and determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

Further, the obtaining of the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium water flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target dense core includes: performing saturated water treatment on the target compact rock core subjected to oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state; performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state; and performing nuclear magnetic deuterium displacement on the target compact rock core treated by saturated oil, and generating a deuterium displacement nuclear magnetic stratification T2 spectrogram of the cross section in the nuclear magnetic deuterium displacement process.

Further, the method for detecting the fluid in the tight rock core further comprises the following steps: and detecting the position and the form of the water flooding front edge in the target compact rock core by using the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Further, the method for detecting the fluid in the tight rock core further comprises the following steps: and performing nuclear magnetic resonance imaging treatment on the cross section in the nuclear magnetic resonance deuterium displacement process.

In a second aspect, the present application provides a fluid testing apparatus in a tight core, comprising:

the physical property parameter acquisition module is used for acquiring the physical property parameters of the target compact rock core after the oil washing treatment;

the acquisition nuclear magnetic stratification T2 spectrogram module is used for arranging the target compact rock core in a nuclear magnetic equipment holder and respectively acquiring a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one cross section along the axial direction of the target compact rock core, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is a nuclear magnetic stratification T2 spectrogram of the cross section in a nuclear magnetic deuterium flooding process of the target compact rock core;

and the fluid detection module is used for carrying out fluid detection on the target compact rock core by applying the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Further, the fluid detection module includes: an initial oil saturation unit is obtained and used for obtaining the initial oil saturation of the target compact rock core by applying a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram; a recovery factor and residual saturation unit, configured to apply the pre-acquired nuclear magnetic spectrum curve of the instrument base signal, a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium water flooding nuclear magnetic stratification T2 spectrogram to obtain a core recovery factor and a core residual oil saturation of the target dense core; and the fluid distribution change unit is used for determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

Further, the module for obtaining nuclear magnetic stratification T2 spectrogram comprises: acquiring a saturated water nuclear magnetic stratification T2 spectrogram unit, wherein the saturated water nuclear magnetic stratification T2 spectrogram unit is used for performing saturated water treatment on the target compact rock core after oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state; acquiring a saturated oil nuclear magnetic stratification T2 spectrogram unit, wherein the saturated oil nuclear magnetic stratification T2 spectrogram unit is used for performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state; and obtaining a deuterium-water flooding nuclear-magnetism layering T2 spectrogram unit, wherein the deuterium-water flooding nuclear-magnetism layering T2 spectrogram unit is used for performing nuclear-magnetism deuterium-water flooding on the target compact rock core after saturated oil treatment, and generating a deuterium-water flooding nuclear-magnetism layering T2 spectrogram of the cross section in the nuclear-magnetism deuterium-water flooding process.

Further, the fluid detection device in the tight rock core further comprises: and the module for acquiring the position and the shape of the water flooding front edge is used for detecting the position and the shape of the water flooding front edge in the target compact rock core by applying the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Further, the fluid detection device in the tight rock core further comprises: and the nuclear magnetic resonance imaging module is used for performing nuclear magnetic resonance deuterium displacement on the target compact rock core after saturated oil, and performing nuclear magnetic resonance imaging treatment on the cross section in the nuclear magnetic resonance deuterium displacement process.

In a third aspect, the present application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method for fluid detection in a tight rock core when executing the program.

In a fourth aspect, the present application provides a computer readable storage medium having stored thereon computer instructions that, when executed, implement the method of fluid detection in tight rock centers.

According to the technical scheme, the application provides a method and a device for detecting the fluid in the compact rock core. Wherein, the method comprises the following steps: obtaining physical property parameters of the target compact rock core after oil washing treatment; the target compact rock core is arranged in a nuclear magnetic equipment holder, and a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core are respectively obtained, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core; and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram. The fluid detection method and the fluid detection device can realize fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable; particularly, the method can detect the change of key physical property parameters such as the recovery ratio of different sections of different positions of the compact oil core and the distribution of residual oil, can realize the effect which cannot be realized by the traditional experiment, particularly various parameters of the water flooding front edge, has high process accuracy, and can provide a basis for the development and adjustment of an oil field.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow chart of a method for fluid detection in a tight core in an embodiment of the present application;

FIG. 2 is a schematic view of a nuclear magnetic equipment holder according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of steps 301 to 303 of a method for detecting fluid in a tight core according to an embodiment of the present application;

FIG. 4 is a schematic flow chart of steps 201 to 203 of a method for detecting fluid in a tight core according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of the fluid detection device in the tight core of the present example;

FIGS. 6(a) to 6(f) are the nuclear magnetic stratification T2 spectra in the specific application example of the present application;

FIG. 7 is a line graph of the extent of mining along an axial cross-section of a core in an example of a particular application of the present application;

FIG. 8 is a plot of residual oil saturation along an axial section of a core in a particular example of the application;

FIGS. 9(a) and 9(b) are schematic diagrams illustrating the spectra of the nuclear magnetic stratification T2 in the specific application example of the present application;

fig. 10 is a block diagram schematically illustrating a system configuration of an electronic device 9600 according to an embodiment of the present application.

Description of the symbols

1. An intermediate container;

2. an online nuclear magnetic device;

3. a displacement pump;

4. a control unit;

5. a back pressure valve;

6. a hand pump;

7. a heating unit and a circulating pump;

8. and (7) enclosing and pressing the pump.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to solve the problems of low detection precision of fluid in the compact rock core, internal fluid loss and incapability of accurately detecting nuclear magnetic data of a water flooding front edge part, the application considers changing the existing fluid detection method, provides a fluid detection method applied to the physical simulation experiment process of the compact rock core in the petroleum industry, processes the compact rock core subjected to oil washing, tests the nuclear magnetic T2 signal of saturated simulated formation water of the compact rock core, and eliminates the nuclear magnetic T2 signal of the saturated oil after the water phase signal is eliminated. Putting the core into high-temperature high-pressure online nuclear magnetic resonance equipment, setting the temperature and the injection pressure, starting a physical simulation experiment, and detecting layered T2 spectrums corresponding to fluids with different cross sections in the process of the physical simulation experiment of the core by combining a T2 spectrum detection and gradient field application in the process of the experiment. According to the results of a nuclear magnetic test layering T2 spectrum, the residual oil saturation and the recovery ratio of different sections of the compact oil core in the physical simulation experiment process are calculated, and particularly, various parameters of the water flooding front are quantitatively researched. The method and the device can accurately test the distribution, the recovery rate and the residual oil saturation of the fluid in different pores of the compact rock core in the physical simulation experiment process, and can effectively improve the detection efficiency.

Based on this, in order to realize fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable, an embodiment of the application provides a fluid detection device in the compact rock core, the device may be a server or a client device, and the client device may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), a vehicle-mounted device, an intelligent wearable device, and the like. Wherein, intelligence wearing equipment can include intelligent glasses, intelligent wrist-watch and intelligent bracelet etc..

In practical applications, the part of performing the fluid detection in the tight rock core may be performed at the server side as described above, or all operations may be performed in the client device. The selection may be specifically performed according to the processing capability of the client device, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. The client device may further include a processor if all operations are performed in the client device.

The client device may have a communication module (i.e., a communication unit), and may be communicatively connected to a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, the server may also include a server on an intermediate platform, for example, a server on a third-party server platform that is communicatively linked to the task scheduling center server. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed apparatus.

The server and the client device may communicate using any suitable network protocol, including network protocols not yet developed at the filing date of this application. The network protocol may include, for example, a TCP/IP protocol, a UDP/IP protocol, an HTTP protocol, an HTTPS protocol, or the like. Of course, the network Protocol may also include, for example, an RPC Protocol (Remote Procedure Call Protocol), a REST Protocol (Representational State Transfer Protocol), and the like used above the above Protocol.

The following examples are intended to illustrate the details.

As shown in fig. 1, in order to implement fluid detection on different sections of a tight core, and the detection process is efficient and reliable, the embodiment provides a method for detecting fluid in a tight core, in which an execution main body is a fluid detection device in the tight core, and the method specifically includes the following steps:

step 100: and acquiring physical property parameters of the target compact rock core after oil washing treatment.

Specifically, the physical property parameters comprise the length, the diameter, the porosity, the permeability and a movable fluid T2 cut-off value of the target dense core; for example, the target dense core has a length of 5cm and a diameter of 2.5 cm.

Step 200: and arranging the target compact rock core in a nuclear magnetic equipment holder, and respectively obtaining a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core.

Specifically, a plurality of nuclear magnetic stratification T2 spectrograms with the same cross section in the nuclear magnetic deuterium water flooding process of the target compact rock core can be obtained. It can be understood that the T2 spectrum of different sections of the core can be effectively obtained by applying the layered T2 technology, and the effects of identifying the water flooding front and calculating the oil content change and fluid distribution of different sections can be realized.

For example, referring to fig. 2, the nuclear magnetic equipment holder comprises an online nuclear magnetic equipment 2, a displacement pump 3, an intermediate container 1, a warming unit and circulating pump 7, a confining pressure pump 8, a hand pump 6, a control unit 4 and a back pressure valve 5; the online nuclear magnetic equipment comprises a rock core holder, and an N-pole magnet and an S-pole magnet which are respectively arranged on two sides of the rock core holder; the control unit may be a fluid detection device in the tight core; the intermediate container 1 respectively contains manganese water, crude oil, deuterium water and N₂And the like.

Step 300: and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Referring to fig. 3, to further improve the accuracy and efficiency of fluid detection in tight rock core, in one embodiment of the present application, step 300 comprises:

step 301: and obtaining the initial oil saturation of the target compact rock core by using a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram.

Specifically, the pre-acquired nuclear magnetic spectrum curve of the instrument base signal is related to hardware parameters of a nuclear magnetic equipment holder, and in order to avoid the influence of the nuclear magnetic equipment holder on a detection result, the nuclear magnetic spectrum curve of the instrument base signal can be acquired by detecting the nuclear magnetic spectrum curve before a target compact rock core is placed in the nuclear magnetic equipment holder. The formula for obtaining the initial oil saturation of the target compact core is as follows:

wherein S is_oiThe initial oil saturation of the core is expressed in units of: percent; a. the_i,o、A_i,wAnd A_i,bRespectively representing the corresponding amplitude value on the saturated oil nuclear magnetic stratification T2 spectrogram, the corresponding amplitude value on the saturated water nuclear magnetic stratification T2 spectrogram and the corresponding amplitude value on the instrument substrate signal nuclear magnetic spectrum curve at the same time point.

Step 302: and obtaining the core recovery ratio and the core residual oil saturation of the target compact core by using the pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-flooding nuclear magnetic stratification T2 spectrogram.

Specifically, the formula for obtaining the core recovery factor of the target compact core is as follows:

specifically, a formula for obtaining the core residual oil saturation of the target dense core is as follows:

wherein E is_RRepresenting the core recovery ratio in%; s_orRepresents the core remaining oil saturation in%; a. the_i,o、A_i,aAnd A_i,bRespectively representing the corresponding amplitude value on a saturated oil nuclear magnetic stratification T2 spectrogram, the corresponding amplitude value on a deuterium water flooding nuclear magnetic stratification T2 spectrogram and the corresponding amplitude value on an instrument substrate signal nuclear magnetic spectrum curve at the same time point.

Step 303: and determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

Referring to fig. 4, in order to further improve the efficiency and accuracy of obtaining the nuclear magnetic stratification T2 spectrum, in an embodiment of the present application, step 200 includes:

step 201: and performing saturated water treatment on the target compact rock core after oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state.

Specifically, a nuclear magnetic stratification T2 spectrogram of at least one section of the axial direction of the core in a test saturated water state placed in a nuclear magnetic equipment holder is detected, wherein the nuclear magnetic stratification T2 spectrogram is the saturated water nuclear magnetic stratification T2 spectrogram.

Step 202: and performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state.

Specifically, a nuclear magnetic stratification T2 spectrogram of the cross section in a saturated oil state is detected, wherein the nuclear magnetic stratification T2 spectrogram is the saturated oil nuclear magnetic stratification T2 spectrogram.

Step 203: and performing nuclear magnetic deuterium displacement on the target compact rock core treated by saturated oil, and generating a deuterium displacement nuclear magnetic stratification T2 spectrogram of the cross section in the nuclear magnetic deuterium displacement process.

Specifically, an online nuclear magnetic deuterium-water flooding experiment can be performed, a nuclear magnetic stratification T2 spectrogram under different injection quantities is detected in the flooding process, and the nuclear magnetic stratification T2 spectrogram is the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

In a preferred embodiment, step 202 further comprises displacing the target dense core treated with saturated water with manganese water to eliminate interference of the nuclear magnetic signal of the water phase.

In order to achieve quantitative detection of the water flooding front and provide a basis for development and adjustment of an oil field, in an embodiment of the present application, the method for detecting a fluid in a tight core further includes:

step 400: and detecting the position and the form of the water flooding front edge in the target compact rock core by using the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

In order to further improve the efficiency and accuracy of fluid detection on different sections of the tight core, in an embodiment of the present application, the method for fluid detection in the tight core further includes:

step 500: and performing nuclear magnetic resonance imaging treatment on the cross section in the nuclear magnetic resonance deuterium displacement process.

Specifically, according to the result of the nuclear magnetic resonance imaging, the occurrence state of the fluid in the target compact core can be qualitatively detected.

From the aspect of software, in order to implement fluid detection on different sections of the tight rock core, and the detection process is efficient and reliable, the present application provides an embodiment of a fluid detection apparatus in the tight rock core for implementing all or part of the fluid detection method in the tight rock core, and referring to fig. 5, the fluid detection apparatus in the tight rock core specifically includes the following contents:

and the physical property parameter obtaining module 10 is used for obtaining the physical property parameters of the target compact rock core after the oil washing treatment.

The acquisition nuclear magnetic stratification T2 spectrogram module 20 is configured to set the target compact core in a nuclear magnetic equipment holder, and respectively acquire a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram, and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one cross section along an axial direction of the target compact core, where the deuterium flooding nuclear magnetic stratification T2 spectrogram is a nuclear magnetic stratification T2 spectrogram of the cross section in a process of performing nuclear magnetic deuterium flooding on the target compact core.

And the fluid detection module 30 is used for performing fluid detection on the target compact rock core by applying the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

In one embodiment of the present application, the fluid detection module 30 comprises:

and the initial oil saturation obtaining unit 31 is configured to obtain the initial oil saturation of the target dense core by applying a pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram and the saturated oil nuclear magnetic stratification T2 spectrogram.

And the recovery factor and residual saturation unit 32 is used for obtaining the core recovery factor and the core residual oil saturation of the target compact core by applying the pre-obtained instrument substrate signal nuclear magnetic spectrum curve, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium water flooding nuclear magnetic stratification T2 spectrogram.

And the fluid distribution change obtaining unit 33 is used for determining the internal fluid distribution change of the target compact rock core according to the initial oil saturation, the rock core recovery ratio, the rock core residual oil saturation and the physical parameters.

Further, in an embodiment of the present application, the module 20 for obtaining a nuclear magnetic stratification T2 spectrum includes:

and acquiring a saturated water nuclear magnetic stratification T2 spectrogram unit 21, which is used for performing saturated water treatment on the target compact rock core after oil washing treatment and generating a saturated water nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated water state.

And acquiring a saturated oil nuclear magnetic stratification T2 spectrogram unit 22, which is used for performing saturated oil treatment on the target compact rock core after saturated water treatment, and generating a saturated oil nuclear magnetic stratification T2 spectrogram of the cross section when the target compact rock core is in a saturated oil state.

And obtaining a deuterium-flooding nuclear-magnetism delamination T2 spectrogram unit 23, which is used for performing nuclear-magnetism deuterium-flooding on the target compact rock core treated by saturated oil, and generating a deuterium-flooding nuclear-magnetism delamination T2 spectrogram of the cross section in the nuclear-magnetism deuterium-flooding process.

Further, in an embodiment of the present application, the fluid detecting apparatus in the tight core further includes:

and the module 40 for acquiring the position and the shape of the water flooding front edge is used for detecting the position and the shape of the water flooding front edge in the target compact rock core by applying the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

Further, in an embodiment of the present application, the fluid detecting apparatus in the tight core further includes:

and the nuclear magnetic resonance imaging module 50 is used for performing nuclear magnetic resonance deuterium water flooding on the target compact rock core after saturated oil, and performing nuclear magnetic resonance imaging processing on the cross section in the nuclear magnetic resonance deuterium water flooding process.

The embodiment of the fluid detection apparatus in a tight rock core provided in this specification may be specifically used for performing the processing procedure of the embodiment of the fluid detection method in a tight rock core, and the functions thereof are not described herein again, and reference may be made to the detailed description of the embodiment of the fluid detection method in a tight rock core.

In order to further explain the scheme, the application provides a specific application example of the fluid detection device in the tight rock core, which specifically comprises the following contents:

s1: and selecting a compact rock core, and testing basic physical parameters such as length, diameter, porosity, permeability, movable fluid T2 cut-off value and the like after oil washing.

S2: vacuumizing saturated water, and placing the core into a holder of nuclear magnetic equipment to test nuclear magnetic stratification T2 spectrograms of different sections of the core in the axial direction under the state of saturated water. Then, the water phase nuclear magnetic signal is eliminated by using manganese water for displacement.

For example, the nuclear magnetic stratification T2 is shown in FIGS. 9(a) and (b), wherein H represents length, T2 represents time, and NMR represents magnitude of signal.

S3: and (3) carrying out saturated oil on the rock core, and placing the rock core in a holder of nuclear magnetic equipment to test a nuclear magnetic stratification T2 spectrogram under a saturated oil state.

S4: and then carrying out an online nuclear magnetic deuterium-water flooding experiment, and testing a layered T2 spectrum under different injection quantities in the flooding process.

S5: by means of the obtained layered T2 spectrum, key parameters such as extraction degrees, residual oil saturation and the like of different sections of different positions of the core can be calculated by using a T2 spectrum calculation method.

Fig. 6(a) to 6(f) are layered T2 spectrograms of the core with an injection amount of 0.5 times the Pore Volume (PV), wherein fig. 6(a) and 6(b) respectively show the deuterium flooding nuclear magnetic layered T2 spectrograms measured by two target dense cores with different pore permeabilities collected in the Changqing area; fig. 6(c) and 6(d) show the deuterium water flooding nuclear magnetic stratification T2 spectrogram measured by two target compact core points with different pore permeability collected in daqing area respectively; fig. 6(e) and 6(f) show the measured deuterium water flooding nuclear magnetic stratification T2 spectra of two different pore-infiltrated target dense cores collected in the Jilin area, respectively. The injection medium was injected from the left side, with the horizontal axis being the core axial length and the vertical axis being the T2 relaxation time. With the injection of the injection medium from the left side, the position of a displacement front is obviously seen in the center of a layered T2 spectrum with the displacement of 0.5PV, the length is 5-8 mm, and the core signal amount is mutated at the position. The size of a black area wrapped by a white area in a spectrum of the nuclear magnetic stratification T2 represents the intensity of a signal, and the signal quantity of the right part in a core is high and is an initial saturated oil state. Compared with the core of the same oil field, the core with lower pore permeability has obviously more short relaxation components. The left part is the water-driven part, and the signal quantity of the core is obviously reduced at the position after oil is displaced by deuterium water without nuclear magnetic signals.

FIG. 7 is a graph of the extent of mining of different cross-sections of the core interior along the axial direction at a displacement of 0.5PV calculated using the stratified T2 data. It can be seen that about 50% of the oil in the core is produced in the left injection medium swept portion, while the right injection medium is not fully swept and the production degree is low. The central part of the flooding front is the area with a sharp change in production degree.

FIG. 8 is a graph of residual oil saturation of different sections of the core interior along the axial direction at a displacement of 0.5PV calculated using the stratified T2 data. Corresponding to the extraction degree result, the residual oil in the left area affected by the injected medium in the rock core is lower, the right side is basically in a saturated oil state, and the central water flooding front edge part is in a transition state.

According to the description, the method and the device for detecting the fluid in the compact rock core provided by the application aim at the physical simulation online nuclear magnetic experiment of the compact oil rock core, the change of key physical property parameters such as the recovery ratio of different sections of the compact oil rock core at different positions in the experiment process, the distribution of residual oil and the like can be tested, the data which cannot be obtained by the traditional experiment, particularly various parameters of the water flooding front edge can be obtained, higher precision can be kept at the same time, the fluid detection on different sections of the compact rock core is realized, and the detection process is efficient and reliable; particularly, the method can detect the change of key physical property parameters such as the recovery ratio of different sections of different positions of the compact oil core and the distribution of residual oil, can realize the effect which cannot be realized by the traditional experiment, particularly various parameters of the water flooding front edge, has high process accuracy, and can provide a basis for the development and adjustment of an oil field.

In terms of hardware, in order to enable fluid detection on different sections of the tight rock core, and the detection process is efficient and reliable, the application provides an embodiment of an electronic device for implementing all or part of contents in a fluid detection method in the tight rock core, where the electronic device specifically includes the following contents:

a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used for realizing information transmission between the fluid detection device in the tight rock core, the user terminal and other related equipment; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, and the like, but the embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the embodiment of the method for implementing the fluid detection in the tight rock core and the embodiment of the device for implementing the fluid detection in the tight rock core, which are incorporated herein, and repeated details are not repeated.

Fig. 10 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 10, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 10 is exemplary; other types of structures may also be used in addition to or in place of the structure to implement telecommunications or other functions.

In one or more embodiments of the present application, the fluid detection function within the tight core may be integrated into the central processor 9100. The central processor 9100 may be configured to control as follows:

step 100: and acquiring physical property parameters of the target compact rock core after oil washing treatment.

Step 200: and arranging the target compact rock core in a nuclear magnetic equipment holder, and respectively obtaining a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core.

Step 300: and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

From the above description, the electronic device provided by the embodiment of the application can realize fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable.

In another embodiment, the fluid detection device in tight rock core may be configured separately from the central processor 9100, for example, the fluid detection device in tight rock core may be configured as a chip connected to the central processor 9100, and the fluid detection function in tight rock core may be realized by the control of the central processor.

As shown in fig. 10, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 also does not necessarily include all of the components shown in fig. 10; in addition, the electronic device 9600 may further include components not shown in fig. 10, which can be referred to in the prior art.

As shown in fig. 10, a central processor 9100, sometimes referred to as a controller or operational control, can include a microprocessor or other processor device and/or logic device, which central processor 9100 receives input and controls the operation of the various components of the electronic device 9600.

The memory 9140 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to realize information storage or processing, or the like.

The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. Power supply 9170 is used to provide power to electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, an LCD display, but is not limited thereto.

The memory 9140 can be a solid state memory, e.g., Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 9140 could also be some other type of device. Memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 being used for storing application programs and function programs or for executing a flow of operations of the electronic device 9600 by the central processor 9100.

The memory 9140 can also include a data store 9143, the data store 9143 being used to store data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers for the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, contact book applications, etc.).

The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.

Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing ordinary telecommunications functions. The audio processor 9130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling recording locally through the microphone 9132 and enabling locally stored sounds to be played through the speaker 9131.

According to the above description, the electronic device provided by the embodiment of the application can be used for carrying out fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable.

Embodiments of the present application also provide a computer-readable storage medium capable of implementing all the steps of the fluid detection method in a tight rock core in the above embodiments, the computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements all the steps of the fluid detection method in a tight rock core in the above embodiments, for example, the processor implements the following steps when executing the computer program:

step 100: and acquiring physical property parameters of the target compact rock core after oil washing treatment.

Step 200: and arranging the target compact rock core in a nuclear magnetic equipment holder, and respectively obtaining a saturated water nuclear magnetic stratification T2 spectrogram, a saturated oil nuclear magnetic stratification T2 spectrogram and a deuterium flooding nuclear magnetic stratification T2 spectrogram of at least one section along the axial direction of the target compact rock core, wherein the deuterium flooding nuclear magnetic stratification T2 spectrogram is the nuclear magnetic stratification T2 spectrogram of the section in the nuclear magnetic deuterium flooding process of the target compact rock core.

Step 300: and carrying out fluid detection on the target compact rock core by using the physical property parameters, the saturated water nuclear magnetic stratification T2 spectrogram, the saturated oil nuclear magnetic stratification T2 spectrogram and the deuterium-water flooding nuclear magnetic stratification T2 spectrogram.

From the above description, the computer-readable storage medium provided by the embodiment of the application can be used for performing fluid detection on different sections of the compact rock core, and the detection process is efficient and reliable.

In the present application, each embodiment of the method is described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Reference is made to the description of the method embodiments.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The principle and the implementation mode of the present application are explained by applying specific embodiments in the present application, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.