Fracturing simulation permeability experiment device

Abstract

The invention discloses a fracturing simulation permeability experiment device, and relates to the technical field of fracturing simulation. The device comprises a base, the top of the base is fixedly connected with a test box, the top of the test box is provided with a test bin, the top of the test box is covered with a cover plate, one side of the test bin is symmetrically provided with a pair of separation openings, separation plates are inserted into the separation openings, and one end of the cover plate and one end of each separation plate are provided with insertion openings; a shaping rod, an air guide pipe and a tracing pipe are installed at one end of the base. The multiple partition plates penetrate through the partition openings to be inserted into the test bin, the soil filled in the test bin is divided into the upper layer, the middle layer and the lower layer, and the gas guide pipes are matched with the pressure pump to input pressurized gas into the soil of the upper layer, the middle layer and the lower layer, so that cracks are generated in the soil; then, a tracing pipe is matched with a tracing gas pump to input tracing gas into cracks in the soil, and a gas chromatograph is matched to track the distribution and flowing path of the tracing gas in the soil.

Description

Technical Field

[0001] The present application relates to the technical field of fracturing simulation, and in particular to a fracturing simulation permeability experimental device. Background Art

[0002] In the field of soil remediation, ex situ remediation and in situ remediation are the two main technical means. Ex situ remediation involves the complex steps of "excavation-transportation-remediation-backfilling", which is costly and takes a long time. In situ remediation mostly uses the placement of remediation reagents and the "permeable reaction wall (PRB)" technology based on groundwater migration, but this method is limited by the slow seepage rate in low permeability formations, and it is difficult to effectively diffuse to the contaminated area in a short time, resulting in unsatisfactory remediation effects. In order to improve the remediation efficiency of low permeability formations, permeability enhancement technology has been proposed. This technology increases the porosity of the formation through hydraulic fracturing or pneumatic fracturing, thereby enhancing permeability, so that the remediation reagents can diffuse to the contaminated area more quickly and more widely.

[0003] At present, permeability enhancement technology mainly relies on hydraulic fracturing or pneumatic fracturing technology to multiply cracks in low permeability formations. This method increases the effective channels and improves the seepage rate and diffusion range of the repair reagents to achieve more effective repair purposes. In the process of technical application, it is crucial to monitor the effect of the multiplied cracks and provide real-time feedback on the degree of fracturing, which can be achieved by adjusting parameters such as pressure and injection rate to ensure the safety of the project. Existing monitoring technologies include hydrogeological and geotechnical mechanics methods such as taking characteristic points before and after fracturing to measure the porosity of the original soil, observing the hydrostatic pressure head of characteristic points, and pumping tests, as well as emerging geophysical technologies such as microseismic monitoring technology and electrical resistance tomography technology.

[0004] Although existing technologies have improved the efficiency of repairing low-permeability formations to a certain extent, they still face significant challenges when implementing fracturing and monitoring work on large-scale plots. Specifically, traditional monitoring methods are time-consuming and labor-intensive when covering a wide area, which not only increases the overall cost of the project but also limits the progress of the project. In addition, these methods have limitations in accuracy and it is difficult to fully capture and evaluate subtle changes in the fracturing effect of the entire plot, especially in terms of permeability and fracture proliferation. Summary of the invention

[0005] The purpose of this application is to solve the problem that traditional monitoring methods are time-consuming and labor-intensive when covering a wide area, and it is difficult to fully capture and evaluate the subtle changes in the fracturing effect of the entire plot, especially in terms of permeability and fracture proliferation. This application provides a fracturing simulation permeability experimental device.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A fracturing simulation permeability experimental device comprises a base, a test box is fixedly connected to the top of the base, a test chamber is opened on the top of the test box, and a cover plate is provided on the top cover of the test box, a pair of partitions are symmetrically opened on one side of the test chamber, a partition plate is inserted inside the partition, and a socket is opened at one end of the cover plate and the partition plate, a shaping rod, an air guide tube and a tracer tube are respectively installed at one end of the base, the input ends of the air guide tube and the tracer tube are both fixedly connected to a gas flow meter, one end of the base is fixedly connected to a pressure pump, and the other end of the base is fixedly connected to a tracer air pump, the pressure pump and the tracer air pump are respectively fixedly connected to the air guide tube and the tracer tube through pipelines, a locking assembly for fixed connection with the test box is installed at one end of the cover plate, and three groups of pressing assemblies for compacting soil samples are installed inside the test chamber.

[0007] By adopting the above technical scheme, by setting the locking assembly and the pressing assembly for use together, it is convenient to insert a plurality of partition plates through the partition opening into the interior of the test chamber, so as to separate the soil filled in the test chamber into three layers of upper, middle and lower. The air guide tube is used in conjunction with a pressure pump to input pressurized gas into the upper, middle and lower layers of soil to generate cracks in the soil. Then, the tracer tube is used in conjunction with a tracer gas pump to input the tracer gas into the cracks in the soil. The distribution and flow path of the tracer gas in the soil are tracked in conjunction with a gas chromatograph, so as to facilitate the rapid simulation of the air pressure repair test on the soil and monitor the soil repair effect, thereby effectively improving the test efficiency and monitoring accuracy of the device.

[0008] Furthermore, the locking assembly includes a pair of locking rods symmetrically hinged at one end of the cover plate, the bottom of the locking rods is fixedly connected with a locking bevel block, the bottom of the test box is symmetrically fixedly connected with a locking bevel matched with the locking bevel block, a locking socket is provided at one end of the locking rod, a locking screw matched with the locking socket is fixedly connected at one end of the test box, and a locking nut is threadedly connected to one end of the locking screw.

[0009] By adopting the above technical scheme, by arranging the coordinated use of the locking screw and the locking nut, after the locking rod is rotated around the hinge axis to drive the locking socket to sleeve one end of the locking screw, by tightening the locking nut, the locking nut pushes the locking rod along the length direction of the locking screw to drive the locking bevel block to form a fixed contact with the locking bevel edge, so as to realize the fixed connection between the cover plate and the test box, thereby improving the practicability of the device.

[0010] Furthermore, the pressing assembly includes pressing plates symmetrically installed inside the test chamber, and pressure sensors are fixedly connected to opposite sides of two adjacent pressing plates. An electric push rod is symmetrically fixedly connected to one end of the test box, and the output end of the electric push rod is fixedly connected to the pressing plate.

[0011] By adopting the above technical solution, by setting the compression plate in conjunction with the pressure sensor and the electric push rod, it is convenient to start the electric push rod to push the two opposing compression plates to squeeze the soil inside the test chamber. At the same time, a pressure sensor is set to monitor the pressure on the soil in real time, so as to simulate the pressure that the soil is subjected to at different depths, thereby further improving the accuracy of the test.

[0012] Furthermore, a sealing groove 1 adapted to the partition opening is provided on the outer side of the test box, a rubber sealing pad 1 is fixedly connected to the inside of the sealing groove 1, and a sealing plate adapted to the sealing groove 1 is fixedly connected to one end of the partition plate.

[0013] By adopting the above technical scheme, by setting the sealing plate and the rubber sealing gasket 1 for use in combination, when the locking rod is rotated to drive the locking bevel block to come into contact with the locking bevel edge, one end of the locking rod pushes the sealing plate to squeeze the rubber sealing gasket 1, and the rubber sealing gasket 1 is deformed under the force and filled in the inside of the sealing groove 1, thereby effectively improving the sealing effect between the partition plate and the partition opening, and further improving the test accuracy of the device.

[0014] Furthermore, a supporting slide groove adapted to the partition opening is symmetrically opened on the inner side of the test chamber, and one end of the partition plate is inserted into the supporting slide groove.

[0015] By adopting the above technical solution, by setting the partition plate and the supporting slide groove for use together, it is convenient to support one end of the partition plate by setting the supporting slide groove when the partition plate is inserted into the test chamber, thereby effectively improving the supporting strength of the partition plate to the soil inside the test chamber, reducing the impact between the soils on the adjacent two sides, and effectively improving the accuracy of the test.

[0016] Furthermore, a sealing groove 2 is provided on the inner side of the socket, and a rubber sealing pad 2 is fixedly connected inside the sealing groove 2.

[0017] By adopting the above technical solution, by setting the rubber sealing pad 2 for use with the airway tube and the tracer tube, it is convenient to squeeze the rubber sealing pad 2 to produce deformation when the airway tube or the tracer tube is inserted into the socket, and improve the sealing between the socket and the airway tube or the tracer tube, thereby effectively improving the sealing effect between the upper, middle and lower three layers of soil during the test, and further improving the accuracy of the test.

[0018] Furthermore, one end of the base is evenly and fixedly connected with three support rods, one end of the support rod is fixedly connected with an arc-shaped elastic sleeve, and the shaping rod, the air guide tube and the tracer tube are respectively inserted into the three arc-shaped elastic sleeves.

[0019] By adopting the above technical solution, by arranging the support rod and the arc-shaped elastic clamping sleeve for use in combination, it is convenient to utilize the rebound characteristics of the arc-shaped elastic clamping sleeve, so that the arc-shaped elastic clamping sleeve rebounds and clamps the shaping rod or the air guide tube or the tracer tube, thereby facilitating the rapid fixation and storage of the shaping rod or the air guide tube or the tracer tube, thereby improving the practicability of the device.

[0020] Furthermore, three installation slots are provided on one side of the test box, an acrylic transparent plate is fixedly connected to the inside of the installation slot, and a scale mark is provided on the surface of the acrylic transparent plate.

[0021] By adopting the above technical solution, by setting the acrylic transparent plate and the scale mark for use in conjunction, it is convenient to observe the soil filling amount inside the test chamber in real time, thereby improving the practicability of the device.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. By setting the locking assembly and the pressing assembly for use together, it is convenient to insert multiple partition plates through the partition opening into the interior of the test chamber, so as to divide the soil filled in the test chamber into three layers of upper, middle and lower. The air guide tube is used in conjunction with the pressure pump to input pressurized gas into the upper, middle and lower layers of soil to cause cracks in the soil. Then, the tracer tube is used in conjunction with the tracer gas pump to input the tracer gas into the cracks in the soil, and the gas chromatograph is used to track the distribution and flow path of the tracer gas in the soil, so as to quickly simulate the repair test of the soil by air pressure and monitor the repair effect of the soil, thereby effectively improving the test efficiency and monitoring accuracy of the device.

[0023] 2. By setting the locking screw and the locking nut for coordinated use, after the locking rod is rotated around the hinge axis to drive the locking socket to cover one end of the locking screw, the locking nut is tightened so that the locking nut pushes the locking rod along the length direction of the locking screw to drive the locking bevel block to form a fixed contact with the locking bevel edge, so as to achieve a fixed connection between the cover plate and the test box, thereby improving the practicability of the device.

[0024] 3. By setting up the sealing plate and the rubber sealing gasket for use together, when the locking rod is rotated to drive the locking bevel block to come into contact with the locking bevel, one end of the locking rod pushes the sealing plate to squeeze the rubber sealing gasket, and the rubber sealing gasket is deformed under the force and filled in the inside of the sealing groove, thereby effectively improving the sealing effect between the partition plate and the partition opening, and further improving the test accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0026] Figure 2 It is a side cross-sectional view of the device body in this application.

[0027] Figure 3 It is an exploded view of the internal structure of the installation slot in this application.

[0028] Figure 4 It is an exploded view of the internal structure of the test chamber in this application.

[0029] Figure 5 It is a schematic diagram of the back three-dimensional structure of the device body in this application.

[0030] Description of reference numerals: 1. Base; 2. Test box; 3. Test chamber; 4. Cover; 5. Partition; 6. Partition plate; 7. Socket; 8. Molding rod; 9. Air guide tube; 10. Tracer tube; 11. Gas flow meter; 12. Pressure pump; 13. Tracer air pump; 14. Locking rod; 15. Locking bevel block; 16. Locking bevel edge; 17. Locking socket; 18. Locking screw; 19. Locking nut; 20. Pressing plate; 21. Pressure sensor; 22. Electric push rod; 23. Sealing groove 1; 24. Rubber sealing pad 1; 25. Sealing plate; 26. Support slide groove; 27. Sealing groove 2; 28. Rubber sealing pad 2; 29. ​​Support rod; 30. Arc elastic ferrule; 31. Mounting groove; 32. Acrylic transparent plate; 33. Scale mark. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 —5 further describes this application in detail.

[0032] The embodiment of the present application discloses a fracturing simulation permeability experimental device.

[0033] Reference Figure 1 - Figure 4 A fracturing simulation permeability experimental device comprises a base 1, a test box 2 is fixedly connected to the top of the base 1, a test chamber 3 is opened on the top of the test box 2, and a cover plate 4 is provided on the top cover of the test box 2, a pair of partitions 5 are symmetrically opened on one side of the test chamber 3, a partition plate 6 is inserted inside the partition 5, and a socket 7 is opened at one end of the cover plate 4 and the partition plate 6, a shaping rod 8, an air guide tube 9 and a tracer tube 10 are respectively installed at one end of the base 1, and the input ends of the air guide tube 9 and the tracer tube 10 are fixedly connected with a gas flow meter 11, a pressure pump 12 is fixedly connected to one end of the base 1, and a tracer air pump 13 is fixedly connected to the other end of the base 1, and the pressure pump 12 and the tracer air pump 13 are respectively fixedly connected to the air guide tube 9 and the tracer tube 10 through pipelines, a locking assembly for fixed connection with the test box 2 is installed at one end of the cover plate 4, and three groups of pressing assemblies for compacting soil samples are installed inside the test chamber 3; The locking assembly includes a pair of locking rods 14 symmetrically hinged at one end of the cover plate 4, a locking bevel 15 is fixedly connected to the bottom of the locking rod 14, a locking bevel 16 adapted to the locking bevel 15 is symmetrically fixedly connected to the bottom of the test box 2, a locking socket 17 is provided at one end of the locking rod 14, a locking screw 18 adapted to the locking socket 17 is fixedly connected to one end of the test box 2, and a locking nut 19 is threadedly connected to one end of the locking screw 18; Moreover, the pressing assembly includes a pressing plate 20 symmetrically installed inside the test chamber 3, and pressure sensors 21 are fixedly connected to the opposite sides of two adjacent pressing plates 20. An electric push rod 22 is symmetrically fixedly connected to one end of the test box 2, and the output end of the electric push rod 22 is fixedly connected to the pressing plate 20.

[0034] When in use, first fill the interior of the test chamber 3 with soil, and in the process of filling the soil, pull one end of the partition plate 6 from bottom to top through the partition opening 5 and insert it into the interior of the test chamber 3, so that the multiple partition plates 6 divide the interior space of the test chamber 3 into three layers: upper, middle and lower. When inserting the two partition plates 6 at the bottom layer, pull the shaping rod 8 to insert it into the socket 7 between the two opposing partition plates 6, so that the shaping rod 8 forms a barrier to the soil filled in the test chamber 3, so as to reduce the situation where the soil in the test chamber 3 blocks the socket 7. Then, the cover plate 4 is pulled to cover the top of the test box 2, and the locking rod 14 is rotated around the hinge axis to a position parallel to the length direction of the test box 2. At this time, the locking rod 14 drives the locking socket 17 to cover one end of the locking screw 18, and at the same time, the locking rod 14 drives the locking bevel 15 to form a fit and contact with the locking bevel 16. Then, the locking nut 19 is rotated to form a threaded connection with the locking screw 18, and the locking nut 19 is driven to push one end of the locking rod 14 along the length direction of the locking screw 18 toward the test box 2, and at the same time, the locking rod 14 forms a fixed contact with one end of the test box 2 to complete the fixed connection between the cover plate 4 and the test box 2; Then, the electric push rod 22 is started to drive the pressing plate 20 to move along the inner wall of the test chamber 3, and the two opposite pressing plates 20 are pushed to move closer to each other, so that the two opposite pressing plates 20 squeeze the soil inside the test chamber 3. At the same time, when the pressing plate 20 pushes the soil, the pressing plate 20 drives the pressure sensor 21 to form a conflict with the soil, and the pressure sensor 21 is used to monitor the pressure on the soil in real time, so as to simulate the pressure on the soil in different soil layers, thereby effectively improving the accuracy of the test; Finally, the shaping rod 8 is pulled out, and one end of the air pipe 9 is pulled through the socket 7 and moved to the middle of the upper, middle and lower soil layers in the test chamber 3 in sequence. At the same time, the pressure pump 12 is started to input pressurized gas into the air pipe 9, and the pressurized gas is introduced into the upper, middle and lower soil layers in the test chamber 3 through the air pipe 9 in sequence, so that the soil is stressed and cracks are generated. Then the air pipe 9 is pulled out, and one end of the tracer tube 10 is pulled through the socket 7 and moved to the middle of the upper, middle and lower soil layers in the test chamber 3 in sequence. At the same time, the tracer air pump 12 is started to input pressurized gas into the air pipe 9 in sequence, and the pressurized gas is introduced into the upper, middle and lower soil layers in the test chamber 3 in sequence, so that the soil is stressed and cracks are generated. Then, the air pipe 9 is pulled out, and one end of the tracer tube 10 is pulled through the socket 7 and moved to the middle of the upper, middle and lower soil layers in the test chamber 3 in sequence. 3 is connected to an external tracer gas, so that the tracer gas pump 13 sequentially inputs the tracer gas into the upper, middle and lower three layers of soil in the test chamber 3 through the tracer tube 10, and the tracer gas flows along the cracks generated in the soil. At the same time, a gas flow meter 11 is set to monitor the gas flow in the air guide tube 9 and the tracer tube 10 in real time, and then a gas chromatograph is used to track the distribution and flow path of the tracer gas in the soil, so as to facilitate the rapid simulation of the air pressure on the soil repair test and monitor the soil repair effect, which effectively improves the test efficiency and monitoring accuracy of the device.

[0035] Reference Figure 1 and Figure 2 , Figure 4 A sealing groove 23 adapted to the partition opening 5 is provided on the outside of the test box 2, a rubber sealing pad 24 is fixedly connected to the inside of the sealing groove 23, and a sealing plate 25 adapted to the sealing groove 23 is fixedly connected to one end of the partition plate 6.

[0036] When in use, when the locking rod 14 is rotated around the hinge axis to drive the locking bevel block 15 to form a conflict with the locking bevel edge 16, one end of the locking rod 14 pushes the sealing plate 25 to form a conflict with the sealing groove 23, and squeezes the rubber sealing pad 24 to deform. At the same time, the rubber sealing pad 24 is deformed under force and filled in the interior of the sealing groove 23, thereby forming a seal between the partition plate 6 and the partition opening 5, further improving the accuracy of the test.

[0037] Reference Figure 1 and Figure 3 , Figure 4 A supporting slide groove 26 adapted to the partition opening 5 is symmetrically opened on the inner side of the test chamber 3 , and one end of the partition plate 6 is inserted into the supporting slide groove 26 .

[0038] When in use, when one end of the traction partition plate 6 is inserted into the interior of the test chamber 3 through the partition opening 5, one end of the partition plate 6 passes through the partition opening 5 and is embedded in the interior of the support slide groove 26, and slides along the interior of the support slide groove 26, so that the support slide groove 26 is used to form support for both ends of the partition plate 6, so as to improve the supporting strength of the partition plate 6 on the soil inside the test chamber 3, reduce the influence between the adjacent two sides of the soil, and effectively improve the accuracy of the test.

[0039] Reference Figure 2 - Figure 4 A sealing groove 27 is provided on the inner side of the socket 7, and a rubber sealing pad 28 is fixedly connected inside the sealing groove 27.

[0040] During use, when the airway tube 9 or the tracer tube 10 is pulled through the socket 7 and inserted into the test chamber 3, the airway tube 9 or the tracer tube 10 is squeezed with the rubber sealing pad 28, and the rubber sealing pad 28 is deformed by the force, filling the space between the socket 7 and the airway tube 9 or the tracer tube 10, thereby effectively improving the sealing effect between the upper, middle and lower layers of soil during the test, and further improving the accuracy of the test.

[0041] Reference Figure 1 and Figure 3 , Figure 5 One end of the base 1 is evenly and fixedly connected with three support rods 29, one end of the support rod 29 is fixedly connected with an arc-shaped elastic sleeve 30, and the shaping rod 8, the air guide tube 9, and the tracer tube 10 are respectively inserted into the inside of the three arc-shaped elastic sleeves 30.

[0042] When in use, the arc-shaped elastic sleeve 30 is squeezed by pulling one end of the shaping rod 8 or the air guide tube 9 or the tracer tube 10, so that the arc-shaped elastic sleeve 30 is deformed by force and wraps the shaping rod 8 or the air guide tube 9 or the tracer tube 10. Then, the rebound characteristics of the arc-shaped elastic sleeve 30 are utilized to make the arc-shaped elastic sleeve 30 rebound and clamp the shaping rod 8 or the air guide tube 9 or the tracer tube 10, thereby facilitating the rapid fixation and storage of the shaping rod 8 or the air guide tube 9 or the tracer tube 10, thereby improving the practicability of the device.

[0043] Reference Figure 1 and Figure 3 Three installation slots 31 are provided on one side of the test box 2 , and acrylic transparent plates 32 are fixedly connected inside the installation slots 31 , and scale marks 33 are provided on the surface of the acrylic transparent plates 32 .

[0044] When in use, the test process inside the test chamber 3 can be observed by setting the acrylic transparent plate 32, so that when the soil is filled into the test chamber 3, the amount of soil added can be observed in real time with the help of the scale mark 33, thereby improving the practicality of the device.

[0045] The implementation principle of the fracturing simulation permeability test device of this embodiment is as follows: first, fill the test chamber 3 with soil, and in the process of filling the soil, pull one end of the partition plate 6 from bottom to top through the partition opening 5 and insert it into the test chamber 3, so that the multiple partition plates 6 divide the internal space of the test chamber 3 into three layers: upper, middle and lower. When inserting the two partition plates 6 at the bottom layer, pull the shaping rod 8 into the socket 7 between the two opposite partition plates 6, so that the shaping rod 8 forms a barrier to the soil filled in the test chamber 3; Then, the cover plate 4 is pulled to cover the top of the test box 2, and the locking rod 14 is rotated around the hinge axis to a position parallel to the length direction of the test box 2. At this time, the locking rod 14 drives the locking socket 17 to cover one end of the locking screw 18, and at the same time, the locking rod 14 drives the locking bevel 15 to form a fit and contact with the locking bevel 16. Then, the locking nut 19 is rotated to form a threaded connection with the locking screw 18, and the locking nut 19 is driven to push one end of the locking rod 14 along the length direction of the locking screw 18 toward the test box 2, and at the same time, the locking rod 14 forms a fixed contact with one end of the test box 2 to complete the fixed connection between the cover plate 4 and the test box 2; At the same time, one end of the locking rod 14 pushes the sealing plate 25 to form a conflict with the sealing groove 23, and squeezes the rubber sealing pad 24 to deform. At the same time, the rubber sealing pad 24 is deformed by force and fills the inside of the sealing groove 23, so that a seal is formed between the partition plate 6 and the partition opening 5; Then, the electric push rod 22 is started to drive the pressing plate 20 to move along the inner wall of the test chamber 3, and the two opposite pressing plates 20 are pushed to move closer to each other, so that the two opposite pressing plates 20 squeeze the soil inside the test chamber 3. At the same time, when the pressing plate 20 pushes the soil, the pressing plate 20 drives the pressure sensor 21 to form a conflict with the soil, and the pressure sensor 21 is used to monitor the pressure on the soil in real time, so as to simulate the pressure on the soil in different soil layers; Finally, by pulling out the shaping rod 8 and pulling one end of the air pipe 9 through the socket 7, it is moved to the middle of the upper, middle and lower soil layers inside the test chamber 3 in sequence. At the same time, by starting the pressure pump 12, pressurized gas is input into the air pipe 9, and the pressurized gas is introduced into the upper, middle and lower soil layers inside the test chamber 3 through the air pipe 9 in sequence, so that the soil is stressed and cracks are generated. Then, the air pipe 9 is pulled out, and one end of the tracer tube 10 is pulled through the socket 7 and moved to the middle of the upper, middle and lower soil layers inside the test chamber 3 in sequence. At the same time, by starting the tracer gas pump 13 to connect the tracer gas externally, the tracer gas pump 13 inputs the tracer gas into the upper, middle and lower soil layers inside the test chamber 3 through the tracer tube 10 in sequence, and the tracer gas flows along the cracks generated inside the soil. Then, a gas chromatograph is used to track the distribution and flow path of the tracer gas in the soil.

Claims

1. A fracturing simulation permeability experimental device, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a test box (2), the top of the test box (2) is provided with a test chamber (3), and the top of the test box (2) is covered with a cover plate (4), one side of the test chamber (3) is symmetrically provided with a pair of partitions (5), the interior of the partitions (5) is inserted with a partition plate (6), one end of the cover plate (4) and the partition plate (6) are provided with a socket (7), one end of the base (1) is respectively installed with a shaping rod (8), an air guide tube (9) and a tracer tube (10), the air guide tube (9) A gas flow meter (11) is fixedly connected to the input end of the tracer tube (10); a pressure pump (12) is fixedly connected to one end of the base (1), and a tracer gas pump (13) is fixedly connected to the other end of the base (1); the pressure pump (12) and the tracer gas pump (13) are respectively fixedly connected to the air guide tube (9) and the tracer tube (10) through pipelines; a locking assembly for fixedly connecting to the test box (2) is installed at one end of the cover plate (4); and three groups of pressing assemblies for compacting soil samples are installed inside the test chamber (3).

2. A fracturing simulation permeability experimental device according to claim 1, characterized in that: The locking assembly comprises a pair of locking rods (14) symmetrically hinged at one end of the cover plate (4); a locking bevel block (15) is fixedly connected to the bottom of the locking rods (14); a locking bevel (16) adapted to the locking bevel block (15) is symmetrically fixedly connected to the bottom of the test box (2); a locking socket (17) is formed at one end of the locking rods (14); a locking screw (18) adapted to the locking socket (17) is fixedly connected to one end of the test box (2); and a locking nut (19) is threadedly connected to one end of the locking screw (18).

3. The fracturing simulation permeability experimental device according to claim 1, characterized in that: The pressing assembly comprises pressing plates (20) symmetrically mounted inside the test chamber (3), pressure sensors (21) being fixedly connected to opposite sides of two adjacent pressing plates (20), and an electric push rod (22) being symmetrically fixedly connected to one end of the test box (2), the output end of the electric push rod (22) being fixedly connected to the pressing plate (20).

4. The fracturing simulation permeability experimental device according to claim 1, characterized in that: The outer side of the test box (2) is provided with a sealing groove (23) adapted to the partition opening (5), a rubber sealing pad (24) is fixedly connected to the interior of the sealing groove (23), and a sealing plate (25) adapted to the sealing groove (23) is fixedly connected to one end of the partition plate (6).

5. The fracturing simulation permeability experimental device according to claim 1, characterized in that: A supporting slide groove (26) adapted to the partition opening (5) is symmetrically provided on the inner side of the test chamber (3), and one end of the partition plate (6) is inserted into the interior of the supporting slide groove (26).

6. The fracturing simulation permeability experimental device according to claim 1, characterized in that: A second sealing groove (27) is provided on the inner side of the socket (7), and a second rubber sealing pad (28) is fixedly connected inside the second sealing groove (27).

7. The fracturing simulation permeability experimental device according to claim 1, characterized in that: One end of the base (1) is evenly and fixedly connected to three support rods (29), one end of the support rod (29) is fixedly connected to an arc-shaped elastic sleeve (30), and the shaping rod (8), the air guide tube (9), and the tracer tube (10) are respectively inserted into the interior of the three arc-shaped elastic sleeves (30).

8. The fracturing simulation permeability experimental device according to claim 1, characterized in that: Three installation slots (31) are provided on one side of the test box (2), an acrylic transparent plate (32) is fixedly connected inside the installation slots (31), and a scale mark (33) is provided on the surface of the acrylic transparent plate (32).

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