A sandstone self-priming damage evaluation method, device and electronic equipment

Abstract

The present invention relates to a sandstone self-imbibition damage evaluation method, device, and electronic equipment. The sandstone self-imbibition damage evaluation method comprises: using a preset test gas to perform a transmission pressure test on a sandstone core sample to determine a first breakthrough pressure of the sandstone core sample; obtaining a pretreated sandstone core sample; using a preset test gas to perform a transmission pressure test on the pretreated sandstone core sample to determine a second breakthrough pressure of the pretreated sandstone core sample; determining the self-imbibition damage rate of the sandstone core sample using a preset self-imbibition damage determination model based on the first breakthrough pressure and the second breakthrough pressure, and evaluating the self-imbibition damage of the test fluid to the sandstone core sample using the self-imbibition damage rate. The method provided by the present invention is simple and easy to operate, and can be used to systematically evaluate and optimize oil and gas well working fluids and oilfield chemical treatment agents, providing a scientific basis for inhibiting capillary self-imbibition, reducing the capillary self-imbibition rate, and promoting working fluid flowback.

Description

Technical Field

[0001] The present invention relates to the field of petroleum engineering, and in particular to a sandstone self-imbibition damage evaluation method, device and electronic equipment. Background Art

[0002] Tight sandstone gas reservoirs are characterized by fine pore throats, high capillary pressures, and severe water lock and water-phase trapping. Capillary imbibition is a major factor in damaging tight, low-permeability sandstone gas reservoirs during oil and gas well drilling, completion, and stimulation. It is also a key mechanism in the recovery of water-driven and fractured reservoirs, and has become a widespread concern in oil and gas drilling and production.

[0003] Extensive research has been conducted both domestically and internationally on the mechanisms and experimental aspects of capillary imbibition. A convenient, accurate, and quantifiable capillary imbibition evaluation method could provide a basis for preventing damage to tight sandstone gas reservoirs during drilling and completion, effectively controlling capillary imbibition behavior and rate, and evaluating, preventing, and resolving water trap damage caused by capillary imbibition and water retention during drilling operations. It could also provide valuable guidance for evaluating and optimizing various oilfield chemical treatment agents and working fluids.

[0004] However, current capillary imbibition evaluation experiments for tight sandstone gas reservoirs mainly characterize the rock sample by indirectly detecting changes in macroscopic physical parameters such as water saturation and permeability. These experiments, such as suspended capillary imbibition experiments and horizontal capillary imbibition experiments, are relatively complex and cumbersome to operate. The suspended capillary imbibition experiment uses a high-precision electronic balance to suspend the imbibition rock sample and measure and analyze the capillary imbibition process. The capillary imbibition characteristics are studied by continuously weighing the rock sample over time. However, these experiments are often affected by unfavorable factors such as balance accuracy, resulting in capillary imbibition characteristic curves that differ from actual results. Furthermore, conventional core flowmeters, used to measure permeability changes, are often difficult to quickly and accurately measure due to the small pore throats of tight sandstone gas reservoir rock samples. Summary of the Invention

[0005] In response to the above problems, the present invention provides a sandstone self-imbibition damage evaluation method, device and electronic equipment.

[0006] The sandstone self-imbibition damage assessment method provided by the present invention comprises the following steps:

[0007] S1. Using a preset test gas to perform a transmission pressure test on a sandstone core sample to determine a first breakthrough pressure of the sandstone core sample;

[0008] S2. Obtain a pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time;

[0009] S3. Performing a transmission pressure test on the pretreated sandstone core sample using a preset test gas to determine a second breakthrough pressure of the pretreated sandstone core sample;

[0010] S4. Determine the self-imbibition damage rate of the sandstone core sample according to the first breakthrough pressure and the second breakthrough pressure using a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample using the self-imbibition damage rate.

[0011] Furthermore, step S3 includes:

[0012] The lower end surface of the pretreated sandstone core sample was used as the end;

[0013] The pre-treated sandstone core sample is subjected to a transmission pressure test using a preset test gas to determine a second breakthrough pressure of the pre-treated sandstone core sample.

[0014] Furthermore, a self-priming damage determination model is preset, including:

[0015]

[0016] Wherein, η is the self-priming damage rate, P0 is the first breakthrough pressure, and P1 is the second breakthrough pressure.

[0017] Furthermore, the preset test gas includes nitrogen.

[0018] Furthermore, in step S2, the lower end surface of the sandstone core sample is immersed in the test fluid to a preset depth, and the ratio of the preset depth to the height of the sandstone core sample is 0.01 to 0.06; and / or the preset time in step S2 is 20 to 50 minutes.

[0019] Furthermore, the test fluid includes distilled water or a solution prepared by using a waterproof lock agent for drilling fluid and distilled water according to a preset concentration.

[0020] The present invention also provides a sandstone self-imbibition damage assessment device, comprising:

[0021] a first breakthrough pressure determination module, configured to perform a transmission pressure test on the sandstone core sample using a preset test gas to determine a first breakthrough pressure of the sandstone core sample;

[0022] a pretreatment module, configured to obtain a pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset period of time;

[0023] a second breakthrough pressure determination module, configured to perform a transmission pressure test on the pretreated sandstone core sample using a preset test gas to determine a second breakthrough pressure of the pretreated sandstone core sample;

[0024] The self-imbibition damage rate determination module is used to determine the self-imbibition damage rate of the sandstone core sample according to the first breakthrough pressure and the second breakthrough pressure through a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate.

[0025] The present invention also provides a computer program product, which includes a computer program or instructions, and implements the steps of the above method when the computer program or instructions are executed by a processor.

[0026] The present invention also provides a computer-readable storage medium, wherein the computer program stored in the computer-readable storage medium implements the steps of the above method when executed by one or more processors.

[0027] The present invention also provides an electronic device comprising a memory and one or more processors, wherein a computer program is stored in the memory, and the memory and the one or more processors are communicatively connected to each other. When the computer program is executed by the one or more processors, the steps of the above method are executed.

[0028] The sandstone self-imbibition damage evaluation method, device and electronic equipment provided by the present invention, when performing sandstone self-imbibition damage evaluation, first determine the first breakthrough pressure of the sandstone core sample; then obtain the pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; determine the second breakthrough pressure of the pretreated sandstone core sample; finally, based on the first breakthrough pressure and the second breakthrough pressure, determine the self-imbibition damage rate of the sandstone core sample through a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate. The method is simple and easy to operate. It can be used to systematically evaluate the preferred oil and gas well working fluid and oilfield chemical treatment agent, and provide a scientific basis for inhibiting the self-imbibition effect of dense sandstone capillaries, reducing the capillary self-imbibition rate, and promoting the return of working fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a flow chart of the steps of the sandstone self-imbibition damage assessment method in Example 1 of the present invention;

[0031] Figure 2 This is a flowchart of an example of evaluating the capillary self-imbibition capacity of a tight sandstone gas reservoir in Example 1 of the present invention;

[0032] Figure 3This is a schematic structural diagram of a sandstone self-priming damage assessment device in Example 2 of the present invention;

[0033] Figure 4 This is a structural diagram of an electronic device in Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0034] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] Figure 1 This is a flow chart of the steps of the sandstone self-imbibition damage assessment method provided in Example 1 of the present invention. Figure 1 As shown, the method includes the following steps:

[0037] Step S1: Using a preset test gas to perform a transmission pressure test on a sandstone core sample to determine a first breakthrough pressure of the sandstone core sample.

[0038] Prior to this step, a sandstone core sample must be prepared and a detection device for transmitting pressure detection must be installed. The sandstone core sample is pre-prepared by a technician based on experimental requirements, and the present invention does not limit the specific method for preparing the sandstone core sample. During the preparation of the sandstone core sample, the specifications of the sandstone core sample can be determined by those skilled in the art based on actual conditions or the specifications of the detection device, and the present invention does not limit this.

[0039] As an example, the size of a sandstone core sample may be 25.4 mm x 50 mm.

[0040] Specifically, an existing rock pressure transmission experimental device can be used as a detection device to measure the first breakthrough pressure. During measurement, the device can provide a gas displacement pressure of more than 10 MPa through a high-pressure gas supply system, and accurately measure the transmission pressure at multiple points on the core column through a pressure measurement system, thereby measuring the breakthrough pressure of the sandstone core sample. When using the rock pressure transmission experimental device to measure the first breakthrough pressure, the sandstone core sample is placed in the core holder of the rock pressure transmission experimental device, and one end of the sandstone core sample is connected to the test gas pipeline (the end of the sandstone core sample connected to the test gas pipeline is the starting end of the gas displacement, and the other end is the end of the gas displacement). Then, the rock pressure transmission experimental device is started and the first breakthrough pressure is recorded.

[0041] The preset test gas in this step can be determined by those skilled in the art based on actual circumstances, and the present invention does not impose any restrictions on this. In one implementation, the preset test gas can be nitrogen. Of course, the preset test gas can also be other gases, such as air. Similarly, the present invention does not impose any restrictions on the purity and flow rate of the preset test gas, and those skilled in the art can set it based on actual circumstances.

[0042] When the rock pressure transmission experimental device is used to detect the transmission pressure of the sandstone core sample using the preset test gas and the first breakthrough pressure of the sandstone core sample is determined, it is necessary to control the rock pressure transmission experimental device to decompress. After decompression, the sandstone core sample is removed from the core holder and the operation of step S2 is performed.

[0043] Step S2: obtaining a pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test liquid for a preset time.

[0044] The lower end face of the sandstone core sample in this step refers to the end face of the gas displacement.

[0045] In this step, the preset duration can be set by those skilled in the art according to experimental needs, and the present invention does not limit this. Specifically, the preset duration can be set to 20 to 50 minutes. More specifically, the preset duration can be 30 minutes.

[0046] Furthermore, in this step, when immersing the lower end surface of the sandstone core sample in the test fluid, the lower end surface of the sandstone core sample is immersed in the test fluid to a predetermined depth. The predetermined depth can be determined by a person skilled in the art based on the height of the sandstone core, and the present invention does not impose any limitation on the value of the predetermined depth. Specifically, the ratio of the predetermined depth to the height of the sandstone core sample is 0.01 to 0.06. In one implementation, if the height of the sandstone core sample is 50 mm, the predetermined depth can be 1 mm to 3 mm.

[0047] In addition, the present invention does not limit the type, concentration, and ratio of the test fluid. The test fluid can be prepared in advance by a technician according to the experimental requirements. For example, the test fluid can be distilled water or a solution prepared by a waterproof lock agent for drilling fluid and distilled water at a preset concentration. Of course, the test fluid can also be other liquids such as purified water and tap water. The preset concentration can also be set by those skilled in the art according to actual needs. The present invention does not limit this. In one implementation, the preset concentration can be 0.5 mol / L.

[0048] Furthermore, after the sandstone core sample is taken out from the test fluid, the height change of the test fluid before and after the pretreatment can be measured and recorded simultaneously.

[0049] Step S3: Using a preset test gas, perform a transmission pressure test on the pretreated sandstone core sample to determine a second breakthrough pressure of the pretreated sandstone core sample.

[0050] Specifically, step S3 includes:

[0051] Step S31: using the lower end surface of the pre-treated sandstone core sample as the end;

[0052] The end refers to the end of the gas displacement, that is, in this step, the lower end surface of the pretreated sandstone core sample is used as the end of the gas displacement.

[0053] Step S32: using a preset test gas to perform a transmission pressure test on the pretreated sandstone core sample to determine a second breakthrough pressure of the pretreated sandstone core sample.

[0054] Wherein, step S3 may also use an existing rock pressure transmission experimental device to detect the second breakthrough pressure. It should be noted that in actual testing, it is necessary to ensure that the various parameter settings of the rock pressure transmission experimental device in step S3 are consistent with the parameter settings of the rock pressure transmission experimental device in step S1.

[0055] It should be understandable that after the measurement is completed, it is necessary to relieve the pressure, shut down the rock pressure transmission experimental device, take out the sandstone core sample, and clean and maintain the experimental device according to the operating instructions of the rock pressure transmission experimental device.

[0056] Step S4: Determine the self-imbibition damage rate of the sandstone core sample according to the first breakthrough pressure and the second breakthrough pressure using a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample using the self-imbibition damage rate.

[0057] Specifically, the preset self-priming damage determination model includes:

[0058]

[0059] Wherein, η is the self-priming damage rate, P0 is the first breakthrough pressure, and P1 is the second breakthrough pressure.

[0060] A higher self-imbibition damage rate indicates a higher degree of self-imbibition damage. If the degree of self-imbibition damage is high as assessed using the method of Example 1, preventive technical measures can be taken to prevent self-imbibition damage, such as using a waterproofing agent for the drilling fluid to reduce capillary self-imbibition damage in dense sandstone during drilling.

[0061] The sandstone self-imbibition damage evaluation method provided in this embodiment first determines the first breakthrough pressure of the sandstone core sample; then obtains the pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; determines the second breakthrough pressure of the pretreated sandstone core sample; finally, based on the first breakthrough pressure and the second breakthrough pressure, determines the self-imbibition damage rate of the sandstone core sample through a preset self-imbibition damage determination model, and evaluates the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate. The method is simple and easy to operate. It can be used to systematically evaluate the optimal oil and gas well working fluid and oilfield chemical treatment agent, providing a scientific basis for inhibiting the self-imbibition effect of dense sandstone capillaries, reducing the capillary self-imbibition rate, and promoting the return of working fluid.

[0062] Furthermore, the sandstone self-imbibition damage evaluation method provided in this embodiment can be used to compare and evaluate the degree of self-imbibition damage of dense sandstone in multiple different blocks (i.e., different locations), and can also be used to compare and evaluate the preventive effects of different waterproofing agents on self-imbibition damage.

[0063] When used to compare and evaluate the degree of self-imbibition damage of dense sandstone in multiple different blocks, it is necessary to prepare a sandstone core sample using the dense sandstone of each block, and then use the method in this embodiment to evaluate the sandstone self-imbibition damage of the sandstone core sample corresponding to each block to obtain the self-imbibition damage rate of the sandstone core sample corresponding to each block. By comparing the size of the self-imbibition damage rate, the degree of self-imbibition damage of dense sandstone in multiple different blocks can be compared and evaluated. However, it should be noted that when comparing and evaluating, it is necessary to ensure that the block where the sandstone core sample is located is used as the experimental variable, and other experimental conditions (such as the specifications of the sandstone core sample, the preset test gas, the test fluid, the preset time, etc.) are all guaranteed to be the same.

[0064] When used to compare and evaluate the preventive effects of different waterproof lockers on self-imbibition damage, taking N types of waterproof lockers as an example, it is necessary to use each waterproof locker to prepare a test liquid, that is, to obtain N test liquids, and use the dense sandstone of the same block to prepare N sandstone core samples, and use each test liquid to evaluate the sandstone self-imbibition damage of each sandstone core sample according to the method in Example 1, and obtain the self-imbibition damage rate of each sandstone core sample. By comparing the size of the self-imbibition damage rate, the preventive effects of different waterproof lockers on self-imbibition damage can be compared and evaluated. It should be noted that when comparing and evaluating, the test liquid needs to be used as an experimental variable, and other experimental conditions (such as the specifications of the sandstone core sample and the block where it is located, the preset test gas, the test liquid, the preset time, etc.) are all guaranteed to be the same.

[0065] The method in Example 1 is described in detail below through a specific implementation case.

[0066] 1. Example of evaluation of capillary self-imbibition capacity in tight sandstone gas reservoirs

[0067] A rock sample from a tight sandstone gas reservoir in a certain area was selected to evaluate the capillary self-imbibition damage of the tight sandstone gas reservoir. Figure 2 As shown in Figure 2, the self-priming injury assessment specifically includes the following steps:

[0068] Step S21: using a selected tight sandstone gas reservoir rock sample from a certain block, a sandstone core sample with a size of 25.4 mm×50 mm is prepared.

[0069] In this example, three sandstone core samples A1, A2, and A3 were prepared, and the core specifications of the three sandstone core samples were the same, specifically 25.4 mm × 50 mm.

[0070] Step S22: Debug and assemble the various components according to the operating instructions of the rock pressure transmission experimental device.

[0071] Step S23: correctly load the sandstone core sample into the core holder and assemble the pipeline. Use nitrogen as the test gas, start the rock pressure transmission experimental device for measurement, and record the nitrogen breakthrough pressure P0.

[0072] Step S24: Measure 50 mL of distilled water and place it in a 150 mL beaker, and place the beaker on a flat laboratory table.

[0073] Step S25: Unload the pressure, remove the sandstone core sample from the core holder, immerse the lower end surface of the sandstone core sample (the end of the gas displacement) in the distilled water surface by 1-2 mm, and fix it for 30 minutes to obtain a pretreated sandstone core sample.

[0074] Step S26: After fixed suspension for 30 minutes, remove the pretreated sandstone core sample, measure and record the height change of distilled water before and after pretreatment (capillary self-imbibition height), reinstall the pretreated sandstone core sample into the core holder, pay attention to the direction, and immerse the liquid end (lower end face) as the end of gas displacement. After reassembly, start the rock pressure transmission experimental device for measurement and record the nitrogen breakthrough pressure P1.

[0075] Step S27: Calculate the capillary self-imbibition damage rate η, and perform self-imbibition damage evaluation based on the capillary self-imbibition damage rate η.

[0076] Specifically, the capillary self-priming damage rate is calculated according to the formula Calculate the capillary self-imbibition damage rate η.

[0077] The test results are shown in Table 1. They show that the tight sandstone gas reservoir in this block has strong capillary imbibition ability, with an average capillary imbibition damage rate of 60.38%. Distilled water imbibition can cause severe water lock and water phase trap damage, significantly increasing the gas breakthrough pressure. In other words, the resistance to gas output from the formation increases during the production process, reducing natural gas production capacity, and requiring preventive technical measures.

[0078] Table 1 Evaluation data of capillary self-imbibition capacity of tight sandstone gas reservoirs

[0079]

[0080] 2. Example of comparative evaluation of waterproof lock agents (evaluating the preventive effect of waterproof lock agents on self-absorption damage)

[0081] The alternative waterproofing agents for drilling fluid include F1, F2, and F3. The comparison and evaluation of waterproofing agents include:

[0082] (1) A tight sandstone gas reservoir rock sample from a certain block was selected and three sandstone core samples with a size of 25.4 mm × 50 mm were prepared, which were marked as B1, B2, and B3 respectively;

[0083] (2) Debug and assemble all components according to the operating instructions of the rock pressure transmission experimental device;

[0084] (3) Correctly load the sandstone core sample B1 into the core holder and assemble the pipeline. Use nitrogen as the test gas, start the rock pressure transmission experimental device for measurement, and record the nitrogen breakthrough pressure P0;

[0085] (4) Select the drilling fluid waterproofing agent F1 and prepare the test solution at a dosage of 0.5% (a 0.5 mol / L solution is obtained by mixing the drilling fluid waterproofing agent with distilled water). Measure 50 mL of the test solution and place it in a 150 mL beaker. Place the beaker on a flat laboratory table.

[0086] (5) Unload the pressure and carefully remove the sandstone core sample B1 from the core holder. Submerge the lower end surface (gas displacement end) of the sandstone core sample B1 into the test fluid surface by 1-2 mm and keep it fixed for 30 minutes. The pretreated sandstone core sample B1 is obtained.

[0087] (6) After suspending for 30 minutes, immediately remove the pretreated sandstone core sample B1, measure and record the height change of the test liquid before and after pretreatment (capillary self-imbibition height), reinstall the sandstone core sample B1 into the core holder, pay attention to the direction, and use the liquid end (lower end face) as the gas displacement end. Reassemble it, start the rock pressure transmission experimental device for measurement, and record the nitrogen breakthrough pressure P1;

[0088] (7) According to the formula capillary self-absorption damage rate Data processing was performed to calculate the capillary self-imbibition damage rate η corresponding to the sandstone core sample B1 and the waterproof lock agent F1.

[0089] (8) Prepare the other two drilling fluid waterproofing agents F2 and F3 corresponding waterproofing agent test solutions in turn, repeat the above steps to test the sandstone core samples B2 and B3 respectively, and obtain the capillary self-imbibition damage rate corresponding to the sandstone core sample B2 and waterproofing agent F2, and the capillary self-imbibition damage rate corresponding to the sandstone core sample B3 and waterproofing agent F3.

[0090] (9) Based on the test results (see Table 2 below), the effects of different types of drilling fluid waterproofing agents were compared and analyzed to select the waterproofing agent.

[0091] The test results show that the three selected waterproofing agents for drilling fluid all have a preventive effect on capillary imbibition damage in the tight sandstone gas reservoirs in this block, among which F3 has the best effect, followed by F1, and F2 has the worst effect. This shows that evaluating and selecting highly targeted waterproofing agents for drilling fluid has a good guiding role in preventing and reducing capillary imbibition damage during drilling.

[0092] Table 2 Preferred evaluation data of waterproof lock agent

[0093]

[0094] Example 2

[0095] This embodiment provides a sandstone self-priming damage assessment device. Figure 3 As shown, the device includes:

[0096] The first breakthrough pressure determination module 301 is configured to perform a transmission pressure test on the sandstone core sample using a preset test gas to determine a first breakthrough pressure of the sandstone core sample.

[0097] The preset test gas includes nitrogen, and the test fluid includes distilled water or a solution prepared by using a drilling fluid waterproofing agent and distilled water at a preset concentration.

[0098] The pre-processing module 302 is configured to obtain a pre-processed sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time.

[0099] In some embodiments, the lower end surface of the sandstone core sample is immersed in the test fluid to a preset depth, and the ratio of the preset depth to the height of the sandstone core sample is 0.01 to 0.06; the preset time is 20 to 50 minutes; the test fluid includes distilled water or a solution prepared by a waterproofing agent for drilling fluid and distilled water at a preset concentration.

[0100] In some embodiments, the second breakthrough pressure determination module 303 is configured to perform a transmission pressure test on the pre-treated sandstone core sample using a preset test gas to determine a second breakthrough pressure of the pre-treated sandstone core sample;

[0101] Among them, when the pre-treated sandstone core sample is subjected to a transmission pressure test using a preset test gas, the lower end surface of the pre-treated sandstone core sample is used as the end; the pre-treated sandstone core sample is subjected to a transmission pressure test using a preset test gas to determine the second breakthrough pressure of the pre-treated sandstone core sample.

[0102] In some embodiments, the self-imbibition damage rate determination module 304 is respectively connected to the first breakthrough pressure determination module 301, the preprocessing module 302, and the second breakthrough pressure determination module 303, and is used to determine the self-imbibition damage rate of the sandstone core sample based on the first breakthrough pressure and the second breakthrough pressure through a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate.

[0103] In some embodiments, a pre-set self-absorption injury determination model includes:

[0104]

[0105] Wherein, η is the self-priming damage rate, P0 is the first breakthrough pressure, and P1 is the second breakthrough pressure.

[0106] The sandstone self-imbibition damage evaluation device provided in this embodiment first determines the first breakthrough pressure of the sandstone core sample; then obtains the pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; determines the second breakthrough pressure of the pretreated sandstone core sample; finally, based on the first breakthrough pressure and the second breakthrough pressure, determines the self-imbibition damage rate of the sandstone core sample through a preset self-imbibition damage determination model, and evaluates the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate. The method is simple and easy to operate. It can be used to systematically evaluate the preferred oil and gas well working fluid and oilfield chemical treatment agent, providing a scientific basis for inhibiting the self-imbibition effect of dense sandstone capillaries, reducing the capillary self-imbibition rate, and promoting the return of working fluid.

[0107] Example 3

[0108] In this embodiment, a computer program product is provided, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, all or part of the steps of the method in the above-mentioned embodiment 1 are implemented, and this embodiment will not be repeated here.

[0109] Furthermore, the computer program product may include one or more computer executable components configured to perform the embodiments when the program is run; the computer program product may also include a computer program tangibly embodied on a computer-readable medium, the computer program including program code for performing any method in the embodiments of the present disclosure. In such an embodiment, the computer program may be downloaded and installed from a network via a communication component and / or installed from a removable medium.

[0110] Example 4

[0111] This embodiment provides a computer-readable storage medium. The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements all or part of the steps of the method in the above-mentioned embodiment 1. This embodiment will not be repeated here.

[0112] Example 5

[0113] This embodiment provides an electronic device, Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the electronic device 400 includes: at least one processor 401, at least one communication bus 402, a user interface 403, at least one external communication interface 404, and a memory 405. The communication bus 402 is configured to achieve connection and communication between these components. The user interface 403 may include a display screen, and the external communication interface 404 may include a standard wired interface and a wireless interface. The memory 405 stores a computer program, and the memory 405 and one or more processors 401 are in communication with each other. When the computer program is executed by one or more processors, the processor 401 is configured to execute the computer program stored in the memory to implement all or part of the steps of the method in the above-mentioned embodiment 1. This embodiment will not be repeated here.

[0114] The sandstone self-imbibition damage evaluation method, device and electronic equipment provided by the present invention, when performing sandstone self-imbibition damage evaluation, first determine the first breakthrough pressure of the sandstone core sample; then obtain the pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; determine the second breakthrough pressure of the pretreated sandstone core sample; finally, based on the first breakthrough pressure and the second breakthrough pressure, determine the self-imbibition damage rate of the sandstone core sample through a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate. The method is simple and easy to operate. It can be used to systematically evaluate the preferred oil and gas well working fluid and oilfield chemical treatment agent, and provide a scientific basis for inhibiting the self-imbibition effect of dense sandstone capillaries, reducing the capillary self-imbibition rate, and promoting the return of working fluid.

[0115] The terms and expressions used in this specification are for illustrative purposes only and are not intended to be limiting. Those skilled in the art will appreciate that various changes may be made to the details of the embodiments described above without departing from the basic principles of the disclosed embodiments. Therefore, the scope of the present invention is determined solely by the claims. In the claims, unless otherwise indicated, all terms are to be interpreted in their broadest reasonable sense.

Claims

1. A sandstone self-imbibition damage assessment method, characterized in that: The method comprises the following steps: S1. Performing a transmission pressure test on a sandstone core sample using a preset test gas to determine a first breakthrough pressure of the sandstone core sample; S2. Obtaining a pretreated sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; S3. Using the preset test gas to perform a transmission pressure test on the pretreated sandstone core sample to determine a second breakthrough pressure of the pretreated sandstone core sample; S4. Determine the self-imbibition damage rate of the sandstone core sample according to the first breakthrough pressure and the second breakthrough pressure using a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample using the self-imbibition damage rate.

2. The sandstone self-imbibition damage assessment method according to claim 1, characterized in that: Step S3 includes: Using the lower end surface of the pretreated sandstone core sample as the end; The pre-treated sandstone core sample is subjected to a transmission pressure test using the preset test gas to determine a second breakthrough pressure of the pre-treated sandstone core sample.

3. The sandstone self-imbibition damage assessment method according to claim 1, characterized in that: The preset self-priming damage determination model includes: Wherein, η is the self-priming damage rate, P0 is the first breakthrough pressure, and P1 is the second breakthrough pressure.

4. The sandstone self-imbibition damage assessment method according to claim 1, characterized in that: The preset test gas includes: nitrogen.

5. The sandstone self-imbibition damage assessment method according to claim 1, characterized in that: In step S2, the lower end surface of the sandstone core sample is immersed in the test fluid to a preset depth, and the ratio of the preset depth to the height of the sandstone core sample is 0.01 to 0.06; and / or the preset time in step S2 is 20 to 50 minutes.

6. The sandstone self-imbibition damage assessment method according to any one of claims 1 to 5, characterized in that: The test fluid includes distilled water or a solution prepared by using a drilling fluid waterproofing agent and distilled water according to a preset concentration.

7. A sandstone self-priming damage assessment device, characterized in that: include: a first breakthrough pressure determination module, configured to perform a transmission pressure test on the sandstone core sample using a preset test gas to determine a first breakthrough pressure of the sandstone core sample; a pre-processing module, configured to obtain a pre-processed sandstone core sample by immersing the lower end surface of the sandstone core sample in a test fluid for a preset time; a second breakthrough pressure determination module, configured to perform a transmission pressure test on the pretreated sandstone core sample using the preset test gas to determine a second breakthrough pressure of the pretreated sandstone core sample; A self-imbibition damage rate determination module is used to determine the self-imbibition damage rate of the sandstone core sample according to the first breakthrough pressure and the second breakthrough pressure through a preset self-imbibition damage determination model, and evaluate the self-imbibition damage of the test fluid to the sandstone core sample through the self-imbibition damage rate.

8. A computer program product comprising a computer program or instructions, characterized in that: When the computer program or instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium, characterized in that The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements the steps of the method according to any one of claims 1 to 6.

10. An electronic device, characterized in that: The method comprises a memory and one or more processors, wherein a computer program is stored in the memory, and the memory and the one or more processors are communicatively connected to each other, and when the computer program is executed by the one or more processors, the steps of the method according to any one of claims 1 to 6 are performed.

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