Network fracture body diversion capacity anisotropy testing device and method

Abstract

The application provides a network fracture body flow conductivity anisotropy testing device and method, the device comprises a fluid injection and control module, a rock sample special-shaped clamping and flow guiding module, a special-shaped sealing rubber sleeve and a fluid output and metering module; the fluid injection and control module comprises a gas injection module and a liquid injection module, the gas injection module simulates a reservoir gas source; the liquid injection module simulates a stress state under reservoir conditions; the special-shaped sealing rubber sleeve is used for placing a rock sample and comprises a rock sample placement cavity; the fluid output and metering module is a dry output gas source, measures an outlet pressure value and a gas flow value, and forms a data record and a flow curve in a computer. The testing device can simulate the overall flow conductivity of a network fracture body under complex fracture morphology and stress conditions formed after reservoir fracturing reconstruction, evaluate the anisotropy degree of the network fracture body flow conductivity, and provide experimental data for reservoir reconstruction fracturing parameter design and post-fracturing production system optimization.

Description

Technical Field

[0001] This invention relates to the fields of oil and gas reservoir fracturing technology and oil and gas field development technology, specifically to a device and method for testing the anisotropy of the conductivity of network fracture bodies. Background Technology

[0002] Fracture conductivity is a crucial parameter in the design of oil and gas reservoir stimulation parameters and the formulation of development plans. Current testing of fracture conductivity primarily focuses on single fractures, emphasizing the impact of proppant type, particle size, and proppant concentration on conductivity within a single fracture. However, for brittle oil and gas reservoirs or those with well-developed natural fractures, such as shale oil and gas reservoirs or fractured tight sandstone reservoirs, fracturing often results in a fracture network composed of multiple fractures (primary and secondary fractures) rather than a single fracture. Therefore, existing conductivity testing devices and methods for single fractures are unsuitable for testing the conductivity of network fracture bodies, and cannot evaluate the anisotropic characteristics of their conductivity. Existing methods use rock slabs to simulate fractures, failing to simulate fracture penetration across layers, i.e., the conductivity of fractures at different lithological conditions along the fracture walls. Furthermore, existing methods for testing fracture conductivity involve spreading proppant across the fracture surface (uniformly distributed along the fracture height and length). However, in reality, proppant in hydraulic fracturing fractures exhibits a non-uniform distribution along both the fracture length and height. Therefore, existing methods for testing fracture conductivity have limitations and cannot test the conductivity of fractures under different proppant spreading patterns. Consequently, there is an urgent need for a conductivity testing device for complex fracture networks and an experimental and evaluation method for assessing the anisotropic characteristics of conductivity in network fracture volumes. Summary of the Invention

[0003] The purpose of this invention is to address at least one of the aforementioned deficiencies in the prior art. For example, one objective of this invention is to provide a device for testing the anisotropy of the conductivity of a network crack; another objective of this invention is to provide a method for testing the anisotropy of the conductivity of a network crack.

[0004] To achieve the above objectives, the present invention provides an anisotropic testing device for the conductivity of network fracture bodies, the device comprising: a fluid pumping and control module, a rock sample irregular clamping and conductivity module, an irregular sealing sleeve, and a fluid output and metering module;

[0005] The fluid pumping and control module includes a gas pumping module and a liquid pumping module. The gas pumping module provides a gas source to simulate the reservoir gas source; the liquid pumping module applies circumferential pressure to the experimental rock sample to simulate the stress state under reservoir conditions.

[0006] The function of the irregularly shaped sealing sleeve is to hold rock samples, including the rock sample placement cavity;

[0007] The fluid output and metering module is the source of the drying output gas, which measures the outlet pressure and gas flow rate, and generates data records and flow curves in the computer.

[0008] Optionally, the gas injection module includes a nitrogen cylinder, a nitrogen switch valve, a gas flow regulating valve, a first check valve, a first pressure relief valve, a first pressure gauge, and a first gas delivery pipeline;

[0009] The liquid injection module includes a liquid pump, a liquid control valve, a second check valve, a second pressure relief valve, a liquid storage tank, a pumping pipeline, and a second pressure gauge.

[0010] Optionally, the rock sample irregular clamping and guiding module includes a rock sample cylinder, a limiting plate, a stainless steel mesh, a rubber sleeve pressure block, a connecting plate, a pressure plate, a liquid cylinder, and an irregular sealing ring rubber sleeve.

[0011] Alternatively, the rock sample placement cavity of the irregularly shaped sealing sleeve is a cubic structure slightly larger than the rock sample. The four sides of the cavity are edged with hollow cylindrical structure sleeve film. The sleeve film has only an annular surface and a bottom surface. The bottom surface is an inscribed circle structure of the cavity surface, which wraps the rock sample. The annular surface and the irregularly shaped clamping and guiding components of the rock sample are connected. The irregularly shaped sealing sleeve can only be produced as a whole mold and cannot be spliced.

[0012] Alternatively, the irregularly shaped sealing sleeve may be made of high-pressure resistant plastic material.

[0013] Optionally, the fluid output and metering module includes a third pressure gauge, a first switching valve, a second gas supply line, a first gas flow meter, a first data transmission line, a second switching valve, a fourth pressure gauge, a third gas supply line, a first gas desiccant container, a second gas flow meter, a second data transmission line, a third switching valve, a fifth pressure gauge, a fourth gas supply line, a second gas desiccant container, a third gas flow meter, a third data transmission line, a computer, and a third gas desiccant container.

[0014] Another aspect of the present invention provides a method for testing the anisotropy of the flow conduction capacity of a network crack, wherein the testing method is performed using the aforementioned testing apparatus.

[0015] The testing method includes:

[0016] 1) Based on the inversion results of fracture morphology of similar reservoirs or the numerical simulation results of fracture propagation, rock outcrops are cut and combined into possible fracture network morphologies.

[0017] 2) Obtain the morphology of rock sample fractures and record the fracture length L and height H;

[0018] 3) Adjust and place the acquired rock sample inside an anisotropic sealing sleeve;

[0019] 4) Close all switches and valves of the device, open the liquid control valve of the liquid pump to pump liquid into the irregular flow guide module, and close the liquid pump and liquid control valve when the pressure gauge shows that the pressure meets the requirements.

[0020] 5) According to the requirements of multi-isotropy testing, simultaneously open the first, second, and third gas outlet valves;

[0021] 6) Open the nitrogen switch valve of the nitrogen cylinder and introduce nitrogen into the irregular flow guide module. Adjust the pressure value displayed by the gas flow regulating valve to meet the requirements. Record the pressure value P of the first pressure gauge, the pressure value P1 of the third pressure gauge, the pressure value P2 of the fourth pressure gauge, and the pressure value P3 of the fifth pressure gauge.

[0022] 7) The gas enters the irregular flow guiding module through the first gas pipeline and then simultaneously enters the first gas desiccant container, the second gas desiccant container, and the third gas desiccant container. It then enters the first gas flow meter, the second gas flow meter, and the third gas flow meter through the second gas pipeline, the third gas pipeline, and the fourth gas pipeline, respectively. Finally, the flow data is automatically recorded by the computer.

[0023] 8) After the experiment, turn off the nitrogen cylinder, close the nitrogen switch valve, open the first pressure relief valve, open the second pressure relief valve, close all switch valves, disassemble the irregular flow guide module, and take out the rock sample;

[0024] 9) Calculate the pressure difference between the inlet and outlet of the rock sample ΔP1=P-P1, ΔP2=P-P2, ΔP3=P-P3; and obtain the outlet gas flow rates Q1, Q2, and Q3.

[0025] Alternatively, the test duration may be longer than 24 hours.

[0026] Alternatively, the flow guiding capacity in different directions can be calculated using the flow guiding capacity calculation formula:

[0027]

[0028] In the formula, C1, C2, and C3 represent the flow conductivity of the cracks in different directions, μ represents the viscosity of the test gas, L1, L2, and L3 represent the crack lengths in different directions, and H1, H2, and H3 represent the crack heights in different directions.

[0029] Alternatively, the anisotropy H of the conductivity of the network fracture volume can be evaluated based on the ratio of the difference between the maximum and minimum conductivity values ​​in each direction to the average conductivity of the network fracture volume. The larger H is, the stronger the anisotropy of the conductivity of the network fracture volume.

[0030]

[0031] C1, C2, and C3 represent the flow conductivity of the cracks in different directions.

[0032] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0033] (1) The testing device of the present invention can obtain the conductivity and anisotropic characteristics of network fracture bodies with different sand-laying morphologies and different fracture combinations, providing basic data for the optimization of oil and gas reservoir stimulation parameters and the formulation of development plans.

[0034] (2) The testing device of the present invention can simulate the complex fracture morphology and overall conductivity of the network fracture body under stress conditions formed after reservoir fracturing, and evaluate the anisotropy of the conductivity of the network fracture body, that is, the difference in conductivity in each direction, so as to provide experimental data for reservoir fracturing parameter design and post-fracturing drainage system optimization. Attached Figure Description

[0035] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0036] Figure 1A and Figure 1B A schematic diagram of a network crack body with different crack combinations of the present invention is shown.

[0037] Figure 2 A schematic diagram of the anisotropic testing device for the flow conduction capacity of the network crack body according to the present invention is shown.

[0038] Figure 3 The rock sample irregular clamping and flow guiding module of the present invention is shown.

[0039] Figure 4A , Figure 4B and Figure 4C The side view, front view and top view of the irregular sealing sleeve structure of the present invention are shown respectively.

[0040] Explanation of key figure labels:

[0041] 1-Nitrogen cylinder; 2-Nitrogen switch valve; 3-Gas flow regulating valve; 4-First check valve; 5-First pressure relief valve; 6-First pressure gauge; 7-First gas delivery line; 8-Liquid pump; 9-Liquid control valve; 10-Second check valve; 11-Second pressure relief valve; 12-Storage tank; 13-Pump line; 14-Second pressure gauge; 15-Third pressure gauge; 16-First switch valve; 17-Second gas delivery line; 18-First gas flow meter; 19-First data transmission line; 2 0-Second switch valve; 21-Fourth pressure gauge; 22-Third gas pipeline; 23-First gas desiccant container; 24-Second gas flow meter; 25-Second data transmission line; 26-Third switch valve; 27-Fifth pressure gauge; 28-Fourth gas pipeline; 29-Second gas desiccant container; 30-Third gas flow meter; 31-Third data transmission line; 32-Computer; 33-Rock sample; 34-Rock sample irregular clamping and flow guiding module; 35-Third gas desiccant container;

[0042] 3401-Containing pressure cylinder body; 3402-Limiting plate; 3403-Stainless steel mesh; 3404-Rubber sleeve pressure block; 3405-Connecting plate; 3406-Pressure plate; 3407-Connecting plate; 3408-Liquid cylinder; 3409-Irregularly shaped sealing sleeve; 3410-Rock sample;

[0043] 3491 - Irregularly shaped sealing sleeve (3409 and 3491 refer to the same irregularly shaped sealing sleeve); 3492 - Rock sample (33 and 3492 both refer to the placed rock sample);

[0044] A, B, and C represent different lithologies, and F1-F6 represent fractures. Detailed Implementation

[0045] In the following sections, the anisotropic testing apparatus and method for the conductivity of network cracks according to the present invention will be described in detail with reference to exemplary embodiments.

[0046] Exemplary Example 1

[0047] This exemplary embodiment provides a device for testing the anisotropy of the conductivity of a network fracture body. The device includes: a fluid pumping and control module, a rock sample irregular clamping and conductivity module, an irregular sealing sleeve, and a fluid output and metering module.

[0048] The fluid pumping and control module includes a gas pumping module and a liquid pumping module. The gas pumping module provides a gas source to simulate the reservoir gas source; the liquid pumping module applies circumferential pressure to the experimental rock sample to simulate the stress state under reservoir conditions.

[0049] The function of the irregularly shaped sealing sleeve is to hold rock samples, including the rock sample placement cavity;

[0050] The fluid output and metering module is the source of the drying output gas, which measures the outlet pressure and gas flow rate, and generates data records and flow curves in the computer.

[0051] In this embodiment, the gas injection module includes a nitrogen cylinder, a nitrogen switch valve, a gas flow regulating valve, a first check valve, a first pressure relief valve, a first pressure gauge, and a first gas delivery pipeline;

[0052] The liquid injection module includes a liquid pump, a liquid control valve, a second check valve, a second pressure relief valve, a liquid storage tank, a pumping pipeline, and a second pressure gauge.

[0053] In this embodiment, the rock sample irregular clamping and guiding module includes a rock sample cylinder, a limiting plate, a stainless steel mesh, a rubber sleeve pressure block, a connecting plate, a pressure plate, a liquid cylinder, and an irregular sealing ring rubber sleeve.

[0054] In this embodiment, the rock sample placement cavity of the irregularly shaped sealing sleeve is a cubic structure slightly larger than the rock sample. The four sides of the cavity are edged with hollow cylindrical sealing sleeve films. The sealing sleeve film has only an annular surface and a bottom surface. The bottom surface is an inscribed circle structure of the cavity surface, which wraps around the rock sample. The annular surface is connected to the components in the irregularly shaped rock sample clamping and guiding module. In order to ensure sealing and accuracy, the irregularly shaped sealing sleeve can only be produced as a single piece from the mold and cannot be spliced.

[0055] In this embodiment, the irregularly shaped sealing sleeve is made of high-pressure resistant plastic material.

[0056] In this embodiment, the fluid output and metering module includes a third pressure gauge, a first switching valve, a second gas supply line, a first gas flow meter, a first data transmission line, a second switching valve, a fourth pressure gauge, a third gas supply line, a first gas desiccant container, a second gas flow meter, a second data transmission line, a third switching valve, a fifth pressure gauge, a fourth gas supply line, a second gas desiccant container, a third gas flow meter, a third data transmission line, a computer, and a third gas desiccant container.

[0057] Exemplary Example 2

[0058] This exemplary embodiment provides a method for testing the anisotropy of the flow conduction capability of a network crack body, wherein the testing method is performed using the testing apparatus described in Exemplary Embodiment 1.

[0059] The testing method includes:

[0060] 1) Based on the inversion results of fracture morphology of similar reservoirs or the numerical simulation results of fracture propagation, rock outcrops are cut and combined into possible fracture network morphologies.

[0061] 2) Obtain the morphology of rock sample fractures and record the fracture length L and height H;

[0062] 3) Adjust and place the acquired rock sample inside an anisotropic sealing sleeve;

[0063] 4) Close all switches and valves of the device, open the liquid control valve of the liquid pump to pump liquid into the irregular flow guide module, and close the liquid pump and liquid control valve when the pressure gauge shows that the pressure meets the requirements.

[0064] 5) According to the requirements of multi-isotropy testing, simultaneously open the first, second, and third gas outlet valves;

[0065] 6) Open the nitrogen switch valve of the nitrogen cylinder and introduce nitrogen into the irregular flow guide module. Adjust the pressure value displayed by the gas flow regulating valve to meet the requirements. Record the pressure value P of the first pressure gauge, the pressure value P1 of the third pressure gauge, the pressure value P2 of the fourth pressure gauge, and the pressure value P3 of the fifth pressure gauge.

[0066] 7) The gas enters the irregular flow guiding module through the first gas pipeline and then simultaneously enters the first gas desiccant container, the second gas desiccant container, and the third gas desiccant container. It then enters the first gas flow meter, the second gas flow meter, and the third gas flow meter through the second gas pipeline, the third gas pipeline, and the fourth gas pipeline, respectively. Finally, the flow data is automatically recorded by the computer.

[0067] If it is necessary to test the flow conduction capacity of the crack in a specific direction, the gas outlet valve in the required direction can be opened as needed, while the valve in other directions remains closed.

[0068] 8) After the experiment, turn off the nitrogen cylinder, close the nitrogen switch valve, open the first pressure relief valve, open the second pressure relief valve, close all switch valves, disassemble the irregular flow guide module, and take out the rock sample;

[0069] 9) Calculate the pressure difference between the inlet and outlet of the rock sample ΔP1=P-P1, ΔP2=P-P2, ΔP3=P-P3; and obtain the outlet gas flow rates Q1, Q2, and Q3.

[0070] In this embodiment, the test time is greater than 24 hours.

[0071] In this embodiment, the flow guiding capacity in different directions is calculated using the flow guiding capacity calculation formula:

[0072]

[0073] In the formula, C1, C2, and C3 represent the flow conductivity of the cracks in different directions, μ represents the viscosity of the test gas, L1, L2, and L3 represent the crack lengths in different directions, and H1, H2, and H3 represent the crack heights in different directions.

[0074] In this embodiment, the anisotropy H of the conductivity of the network fracture body is evaluated based on the ratio of the difference between the maximum and minimum conductivity values ​​in each direction to the average conductivity of the network fracture body. The larger H is, the stronger the anisotropy of the conductivity of the network fracture body.

[0075]

[0076] C1, C2, and C3 represent the flow conductivity of the cracks in different directions.

[0077] Exemplary Example 3

[0078] This exemplary embodiment provides a method for testing the anisotropy of the flow conduction capability of a network crack body, wherein the testing method is performed using the testing apparatus described in Exemplary Embodiment 1.

[0079] The testing method includes:

[0080] 1. Based on the inversion results of fracture morphology in similar reservoirs or the numerical simulation results of fracture propagation, rock outcrops are cut and combined into possible fracture network morphologies. For example... Figure 1A and Figure 1B As shown, rock outcrops of different lithologies, with relatively or staggered fracture distribution, vertical or horizontal fractures, and different fracture widths, are used to simulate different morphologies of network fracture bodies using the above methods.

[0081] 2. Obtain the morphology of rock sample fractures and record the fracture length L and height H.

[0082] 3. Based on the rock sample obtained in step 1, adjust and place it in... Figure 3 Inside the 3409 irregular-shaped sealing sleeve, Figure 3 The flow diversion simulation includes:

[0083] 1) Use high-pressure resistant plastic materials to make irregularly shaped sealing sleeves, such as... Figure 4A , Figure 4B and Figure 4C As shown: The middle part is a 200mm*200mm*200mm cubic cavity, and the two ends are cylindrical sealed edges. Rock sample 3410 is placed in the cubic cavity.

[0084] 2) The integral confining cylinder body 3401 is made of No. 45 steel. The irregularly shaped sealing sleeve 3409 is placed inside the confining cylinder body 3401. The two ends of the cylinder body are sealed with the hydraulic cylinder 3408 through stainless steel mesh 3403, rubber sleeve pressure block 3404, connecting plate 3405, pressure plate 3406, and connecting plate 3407. The cylinder body ring surface is sealed with four limiting plates 3402. The front end of the limiting plate has a mesh-like air dissipation structure.

[0085] 4. Through Figure 3The device structure includes the installation of the irregularly shaped rock sample clamping and flow guiding module 34 formed in step 3 within the device to simulate the anisotropic test of the flow guiding capacity of the network fracture body.

[0086] 1) Close all switches and valves of the device;

[0087] 2) Open the liquid control valve 9 of the liquid pump 8 to direct the flow to the rock sample irregular clamping and guiding module ( Figure 3 (As shown) Pump liquid into the system. When the second pressure gauge 14 shows that the pressure meets the requirements, shut off the liquid pump 8 and the liquid control valve 9.

[0088] 3) According to the requirements of multi-directional anisotropy testing, simultaneously open the first switch valve 16, the second switch valve 20, and the third switch valve 26 of the gas outlet;

[0089] 4) Open the nitrogen switch valve 2 of nitrogen cylinder 1 to introduce nitrogen into the rock sample irregular clamping and guiding module 34. Adjust the pressure value displayed by the gas flow regulating valve 3 to meet the requirements of the first pressure gauge 6. Record the pressure value P of the first pressure gauge 6, the pressure value P1 of the third pressure gauge 15, the pressure value P2 of the fourth pressure gauge 21, and the pressure value P3 of the fifth pressure gauge 27.

[0090] 5) The gas enters the rock sample irregular clamping and guiding module 34 through the first gas supply line 7, and then simultaneously enters the first gas desiccant container 23, the second gas desiccant container 29, and the third gas desiccant container 35. It then enters the first gas flow meter 18, the second gas flow meter 24, and the third gas flow meter 30 through the second gas supply line 17, the third gas supply line 22, and the fourth gas supply line 28, respectively. Finally, the flow data is automatically recorded by the computer 32.

[0091] 5. If it is necessary to test the flow conduction capacity of the crack in a specific direction, the gas outlet valve in the required direction can be opened as needed, while the valves in other directions should be kept closed.

[0092] 6. The experiment should last longer than 24 hours before it ends.

[0093] 7. Close nitrogen cylinder 1, close nitrogen switch valve 2, and open the first pressure relief valve 5.

[0094] 8. Open the second pressure relief valve 11, then close it. Figure 2 All switches and valves in the middle, disassemble the rock sample irregular clamp and flow guide module 34.

[0095] 9. From Figure 3 Rock sample 3410 / 33 was taken out from inside the sealing sleeve 3409.

[0096] 10. Based on step 4, obtain the pressure difference between the inlet and outlet of the rock sample ΔP1 = P - P1, ΔP2 = P - P2, ΔP3 = P - P3; and obtain the outlet gas flow rates Q1, Q2, and Q3.

[0097] 11. Based on the crack length L and height H obtained in steps 2 and 4, calculate the flow conductivity in different directions using the flow conductivity calculation formula.

[0098]

[0099] Where C1, C2, and C3 represent the flow conductivity of the cracks in different directions, μ represents the viscosity of the test gas, L1, L2, and L3 represent the crack lengths in different directions, and H1, H2, and H3 represent the crack heights in different directions.

[0100] 12. The anisotropy H of the conductivity of the network fracture volume is evaluated based on the ratio of the difference between the maximum and minimum conductivity in each direction to the average conductivity of the network fracture volume. The larger this value, the stronger the anisotropy of the conductivity of the network fracture volume.

[0101]

[0102] C1, C2, and C3 represent the flow conductivity of the cracks in different directions.

[0103] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A device for testing the anisotropy of the conductivity of a network crack, characterized in that, The device includes: a fluid pumping and control module, a rock sample irregular clamping and diversion module, an irregular sealing sleeve, and a fluid output and metering module, wherein... The fluid pumping and control module includes a gas pumping module and a liquid pumping module. The gas pumping module provides a gas source to simulate the reservoir gas source; the liquid pumping module applies circumferential pressure to the experimental rock sample to simulate the stress state under reservoir conditions. The function of the irregularly shaped sealing sleeve is to hold rock samples, including the rock sample placement cavity; The fluid output and metering module is the source of the drying output gas, which measures the outlet pressure and gas flow rate, and generates data records and flow curves in the computer.

2. The network crack flow conductivity anisotropy testing device according to claim 1, characterized in that, The gas injection module includes a nitrogen cylinder, a nitrogen switch valve, a gas volume regulating valve, a first check valve, a first pressure relief valve, a first pressure gauge, and a first gas transmission pipeline. The liquid injection module includes a liquid pump, a liquid control valve, a second check valve, a second pressure relief valve, a liquid storage tank, a pumping pipeline, and a second pressure gauge.

3. The network crack flow conductivity anisotropy testing device according to claim 1, characterized in that, The rock sample irregular clamping and guiding module includes a rock sample cylinder, a limiting plate, a stainless steel mesh, a rubber sleeve pressure block, a connecting plate, a pressure plate, a liquid cylinder, and an irregular sealing ring rubber sleeve.

4. The anisotropic testing device for the conductivity of network cracks according to claim 1, characterized in that, The rock sample placement cavity of the irregularly shaped sealing sleeve is a cubic structure slightly larger than the rock sample. The four sides of the cavity are edged with hollow cylindrical structures of the sleeve film. The sleeve film has only a ring surface and a bottom surface. The bottom surface is an inscribed circle structure of the cavity surface, which wraps the rock sample. The ring surface and the irregularly shaped clamping and guiding components of the rock sample are connected. The irregularly shaped sealing sleeve can only be produced as a whole mold and cannot be spliced.

5. The network crack volume conductance anisotropy testing device according to claim 1, characterized in that, The irregularly shaped sealing sleeve is made of high-pressure resistant plastic material.

6. The anisotropic testing device for the conductivity of network cracks according to claim 1, characterized in that, The fluid output and metering module includes a third pressure gauge, a first switching valve, a second gas supply line, a first gas flow meter, a first data transmission line, a second switching valve, a fourth pressure gauge, a third gas supply line, a first gas desiccant container, a second gas flow meter, a second data transmission line, a third switching valve, a fifth pressure gauge, a fourth gas supply line, a second gas desiccant container, a third gas flow meter, a third data transmission line, a computer, and a third gas desiccant container.

7. A method for testing the anisotropy of the conductivity of a network crack, characterized in that, The anisotropy test method for the conductivity of the network crack body is performed using the test apparatus described in any one of claims 1-6.

8. The method for testing the anisotropy of the conductivity of network cracks according to claim 7, characterized in that, The testing method includes: 1) Based on the inversion results of fracture morphology of similar reservoirs or the numerical simulation results of fracture propagation, rock outcrops are cut and combined into possible fracture network morphologies. 2) Obtain the morphology of rock sample fractures and record the fracture length L and height H; 3) Adjust and place the acquired rock sample inside an anisotropic sealing sleeve; 4) Close all switches and valves of the device, open the liquid control valve of the liquid pump, and pump liquid into the irregular flow guide module. When the pressure gauge shows that the pressure meets the requirements, close the liquid pump and the liquid control valve. 5) According to the requirements of multi-isotropy testing, simultaneously open the first, second, and third gas outlet valves; 6) Open the nitrogen switch valve of the nitrogen cylinder and introduce nitrogen into the irregular flow guide module. Adjust the pressure value displayed by the gas flow regulating valve to meet the requirements. Record the pressure value P of the first pressure gauge, the pressure value P1 of the third pressure gauge, the pressure value P2 of the fourth pressure gauge, and the pressure value P3 of the fifth pressure gauge. 7) The gas enters the irregular flow guiding module through the first gas pipeline and then simultaneously enters the first gas desiccant container, the second gas desiccant container, and the third gas desiccant container. It then enters the first gas flow meter, the second gas flow meter, and the third gas flow meter through the second gas pipeline, the third gas pipeline, and the fourth gas pipeline, respectively. Finally, the flow data is automatically recorded by the computer. 8) After the experiment, turn off the nitrogen cylinder, close the nitrogen switch valve, open the first pressure relief valve, open the second pressure relief valve, close all switch valves, disassemble the irregular flow guide module, and take out the rock sample; 9) Calculate the pressure difference between the inlet and outlet of the rock sample ΔP1=P-P1, ΔP2=P-P2, ΔP3=P-P3; and obtain the outlet gas flow rates Q1, Q2, and Q3.

9. The method for testing the anisotropy of the conductivity of network cracks according to claim 8, characterized in that, The test lasted for more than 24 hours.

10. The method for testing the anisotropy of the conductivity of a network crack body according to claim 7, characterized in that, Calculate the flow guiding capacity in different directions using the flow guiding capacity calculation formula: In the formula, C1, C2, and C3 represent the flow conductivity of the cracks in different directions, μ represents the viscosity of the test gas, L1, L2, and L3 represent the crack lengths in different directions, and H1, H2, and H3 represent the crack heights in different directions.

11. The method for testing the anisotropy of the conductivity of network cracks according to claim 7, characterized in that, The anisotropy H of the conductivity of the network fracture volume is evaluated by the ratio of the difference between the maximum and minimum conductivity values ​​in each direction to the average conductivity of the network fracture volume. The larger the H, the stronger the anisotropy of the conductivity of the network fracture volume. C1, C2, and C3 represent the flow conductivity of the cracks in different directions.

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