A fracturing simulation permeability experimental device

Abstract

The present application discloses a fracturing simulation permeability experimental device, which relates to the field of fracturing simulation technology. The present application includes 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 the top cover of the test box is provided with a cover plate, a pair of partitions are symmetrically opened on one side of the test chamber, a partition plate is inserted into the interior of the partition, and a socket is opened at one end of the cover plate and the partition plate, and a shaping rod, an air guide tube and a tracer tube are respectively installed at one end of the base. The present application divides the soil filled in the test chamber into three layers of upper, middle and lower by setting multiple partitions to pass through the partition opening and insert them into the interior of the test chamber, and uses the air guide tube 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, and then uses the tracer tube in conjunction with the tracer gas pump to input the tracer gas into the cracks in the soil, and cooperates with a gas chromatograph to track the distribution and flow path of the tracer 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 time-consuming. In situ remediation mostly uses the placement of remediation reagents and the "permeable reaction wall (PRB)" technology based on groundwater migration. However, this method is limited by the slow seepage rate in low-permeability formations, making it difficult to effectively diffuse to the contaminated area in a short period of time, resulting in unsatisfactory remediation results. 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, allowing the remediation reagents to diffuse more quickly and widely to the contaminated area.

[0003] Currently, permeability enhancement technology primarily relies on hydraulic or pneumatic fracturing to create fractures in low-permeability formations. This method achieves more effective remediation by increasing the effective channels, increasing the seepage rate and diffusion range of the repair reagents. During the application of this technology, it is crucial to monitor the effectiveness of the fractures and provide real-time feedback on the degree of fracturing. This 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 methods such as measuring the porosity of characteristic points in situ before and after fracturing, observing the hydrostatic pressure head at characteristic points, and pumping tests, as well as emerging geophysical technologies such as microseismic monitoring and electrical resistance tomography.

[0004] While existing technologies have improved the efficiency of remediating low-permeability formations to some extent, significant challenges remain when implementing fracturing and monitoring across large-scale sites. Specifically, traditional monitoring methods are time-consuming and labor-intensive when covering wide areas, which not only increases overall project costs but also limits progress. Furthermore, these methods have limited accuracy, making it difficult to fully capture and assess subtle changes in fracturing effectiveness across the entire site, particularly in terms of permeability and fracture growth. 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 crack 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:

[0007] A fracturing simulation permeability experimental device comprises a base, the top of the base is fixedly connected to a test box, the top of the test box is provided with a test chamber, and the top cover of the test box is provided with a cover plate, a pair of partition openings are symmetrically provided on one side of the test chamber, a partition plate is inserted into the interior of the partition opening, and a socket is provided 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 to 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.

[0008] By adopting the above technical solution and arranging the locking assembly and the pressing assembly for use in conjunction with each other, it is convenient to arrange multiple partition plates and insert them into the interior of the test chamber through the partition opening, so as to separate the soil filled in the test chamber into three layers of upper, middle and lower. An air guide tube is used in conjunction with a pressure pump to input pressurized gas into the three layers of soil in the upper, middle and lower layers, so as to generate cracks in the soil. Then, a tracer tube is used in conjunction with a tracer gas pump to input tracer gas into the cracks in the soil, and a gas chromatograph is used to track the distribution and flow path of the tracer gas in the soil. This facilitates rapid simulation of the air pressure repair test on the soil and monitoring of the soil repair effect, thereby effectively improving the test efficiency and monitoring accuracy of the device.

[0009] 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 to a locking bevel block, the bottom of the test box is symmetrically fixedly connected to a locking bevel adapted to the locking bevel block, a locking socket is provided at one end of the locking rod, a locking screw adapted to the locking socket is fixedly connected to one end of the test box, and a locking nut is threadedly connected to one end of the locking screw.

[0010] By adopting the above technical solution and 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, 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 to form a fixed contact with the locking bevel, thereby realizing a fixed connection between the cover and the test box, thereby improving the practicality of the device.

[0011] Furthermore, the pressing assembly includes pressing plates symmetrically installed inside the test chamber, and pressure sensors are fixedly connected to the 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.

[0012] By adopting the above technical solution, by setting up the combination of the compression plate, the pressure sensor and the electric push rod, it is convenient to push the two opposing compression plates to squeeze the soil inside the test chamber by starting the electric push rod. At the same time, the pressure sensor is set to monitor the pressure on the soil in real time, so as to simulate the pressure on the soil at different depths, thereby further improving the accuracy of the test.

[0013] Furthermore, a sealing groove 1 adapted to the partition opening is opened on the outside of the test box, a rubber sealing gasket 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.

[0014] By adopting the above technical solution, by setting up the cooperation between the sealing plate and the rubber sealing gasket 1, 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.

[0015] Furthermore, a supporting chute adapted to the partition opening is symmetrically provided on the inner side of the test chamber, and one end of the partition plate is inserted into the supporting chute.

[0016] By adopting the above technical solution, by setting up the partition plate and the supporting chute for use together, it is convenient to support one end of the partition plate by setting the supporting chute when the partition plate is inserted into the test chamber, thereby effectively improving the supporting strength of the partition plate on the soil inside the test chamber, reducing the impact between the soil on the adjacent two sides, and effectively improving the accuracy of the test.

[0017] Furthermore, a second sealing groove is provided on the inner side of the socket, and a second rubber sealing gasket is fixedly connected to the interior of the second sealing groove.

[0018] By adopting the above technical solution, by arranging 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 pulled 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 layers of soil during the test, and further improving the accuracy of the test.

[0019] Furthermore, one end of the base is evenly fixedly connected to three support rods, one end of the support rod is fixedly connected to an arc-shaped elastic sleeve, and the shaping rod, air guide tube, and tracer tube are respectively inserted into the three arc-shaped elastic sleeves.

[0020] By adopting the above technical solution, by setting up 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 practicality of the device.

[0021] 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 slots, and a scale mark is provided on the surface of the acrylic transparent plate.

[0022] By adopting the above technical solution and providing the acrylic transparent plate in conjunction with the scale mark, the soil filling amount inside the test chamber can be observed in real time, thereby improving the practicality of the device.

[0023] In summary, this application has at least one of the following beneficial effects:

[0024] 1. By arranging the locking assembly and the pressing assembly for use together, it is convenient to insert multiple partition plates into the interior of the test chamber through the partition opening, so as to divide the soil filled in the test chamber into three layers: 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 soil layers 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. The distribution and flow path of the tracer gas in the soil are tracked in conjunction with the gas chromatograph. This facilitates the rapid simulation of the air pressure repair test on the soil and monitors the soil repair effect, effectively improving the test efficiency and monitoring accuracy of the device.

[0025] 2. By setting up 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 to form a fixed contact with the locking bevel, so as to realize the fixed connection between the cover and the test box, thereby improving the practicality of the device.

[0026] 3. By setting up the cooperation between the sealing plate and the rubber sealing gasket, 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 port, and further improving the test accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0028] Figure 2It is a side sectional view of the device body in this application.

[0029] Figure 3 It is an exploded view of the internal structure of the installation slot in this application.

[0030] Figure 4 This is an exploded view of the internal structure of the test chamber in this application.

[0031] Figure 5 It is a schematic diagram of the back three-dimensional structure of the device body in this application.

[0032] Description of reference numerals:

[0033] 1. Base; 2. Test chamber; 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; 16. Locking bevel; 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 gasket 1; 25. Sealing plate; 26. Support slide; 27. Sealing groove 2; 28. Rubber sealing gasket 2; 29. ​​Support rod; 30. Curved elastic sleeve; 31. Mounting slot; 32. Acrylic transparent plate; 33. Scale mark. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 —5 provides further details of this application.

[0035] The embodiment of the present application discloses a fracturing simulation permeability experimental device.

[0036] Reference Figure 1 - Figure 4 , a fracturing simulation permeability experimental device, comprising 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 the top cover of the test box 2 is provided with a cover plate 4, a pair of partition openings 5 ​​are symmetrically opened on one side of the test chamber 3, a partition plate 6 is inserted inside the partition opening 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 to a gas flow meter 11, one end of the base 1 is fixedly connected to a pressure pump 12, and the other end of the base 1 is fixedly connected to a tracer air pump 13, 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 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;

[0037] The locking assembly includes a pair of locking rods 14 symmetrically hinged at one end of the cover plate 4, a locking bevel 15 fixedly connected to the bottom of the locking rods 14, and a locking bevel 16 adapted to the locking bevel 15 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, and 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;

[0038] In addition, the pressing assembly includes a pressing plate 20 symmetrically installed inside the test chamber 3, and a pressure sensor 21 is fixedly connected to the opposite side 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.

[0039] When in use, first fill the interior of the test chamber 3 with soil, and during the soil filling process, 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 and 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 filling in the test chamber 3, thereby reducing the situation where the soil inside the test chamber 3 blocks the socket 7.

[0040] 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 sleeve 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 resistance 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 resistance with one end of the test box 2, so as to complete the fixed connection between the cover plate 4 and the test box 2.

[0041] Then, the electric push rod 22 is activated to drive the pressing plate 20 to move along the inner wall of the test chamber 3, and the two opposing pressing plates 20 are pushed to move closer to each other, so that the two opposing pressing plates 20 squeeze the soil inside the test chamber 3. At the same time, when the pressing plate 20 pushes the soil, it drives the pressure sensor 21 to form a resistance 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;

[0042] Finally, by pulling out the shaping rod 8, and pulling one end of the air guide tube 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 guide tube 9, and the pressurized gas is sequentially introduced into the upper, middle and lower soil layers inside the test chamber 3 through the air guide tube 9, so that the soil is stressed and cracks are generated. Then, the air guide tube 9 is pulled out, and one end of the tracer tube 10 is pulled through the socket 7, and 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 tracer air pump 1 3. An external tracer gas is connected, so that the tracer gas pump 13 sequentially inputs the tracer gas into the upper, middle and lower soil layers inside the test chamber 3 through the tracer tube 10, and the tracer gas flows along the cracks generated inside the soil. At the same time, a gas flow meter 11 is set to monitor the gas flow inside the gas guide tube 9 and the tracer tube 10 in real time. Then, a gas chromatograph is used to track the distribution and flow path of the tracer gas in the soil, thereby facilitating a rapid simulation of the soil remediation test by air pressure and monitoring the soil remediation effect, effectively improving the test efficiency and monitoring accuracy of the device.

[0043] 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 gasket 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.

[0044] During use, when the locking rod 14 is rotated around the hinge axis to drive the locking bevel 15 to form a conflict with the locking bevel 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 gasket 24 to produce deformation. At the same time, the rubber sealing gasket 24 is deformed under force and fills the inside 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.

[0045] Reference Figure 1 and Figure 3 、 Figure 4 A supporting chute 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 inner part of the supporting chute 26 .

[0046] During use, when one end of the partition plate 6 is pulled through the partition opening 5 and inserted into the interior of the test chamber 3, one end of the partition plate 6 passes through the partition opening 5 and is embedded in the interior of the support slide 26, and slides along the interior of the support slide 26, thereby utilizing the support slide 26 to form support for both ends of the partition plate 6, so as to increase the supporting strength of the partition plate 6 on the soil inside the test chamber 3, reduce the influence between the soil on the adjacent two sides, and effectively improve the accuracy of the test.

[0047] 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 to the interior of the sealing groove 27.

[0048] During use, when the air tube 9 or the tracer tube 10 is pulled through the socket 7 and inserted into the test chamber 3, the air tube 9 or the tracer tube 10 is squeezed with the rubber sealing gasket 28, and the rubber sealing gasket 28 is deformed under force and filled between the socket 7 and the air 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.

[0049] Reference Figure 1 and Figure 3 、 Figure 5 One end of the base 1 is evenly 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 inside of the three arc-shaped elastic sleeves 30.

[0050] 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 the 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 practicality of the device.

[0051] Reference Figure 1 and Figure 3 Three mounting slots 31 are provided on one side of the test box 2 . An acrylic transparent plate 32 is fixedly connected to the interior of the mounting slots 31 . A scale mark 33 is provided on the surface of the acrylic transparent plate 32 .

[0052] During use, the test process inside the test chamber 3 can be observed by setting the acrylic transparent plate 32. Therefore, when filling the test chamber 3 with soil, 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.

[0053] The operating principle of the fracturing simulation permeability test device of this embodiment is as follows: first, the interior of the test chamber 3 is filled with soil. During the soil filling process, one end of the partition plate 6 is sequentially pulled from bottom to top through the partition opening 5 and inserted 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 the two partition plates 6 at the bottom are inserted, the shaping rod 8 is pulled and inserted 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.

[0054] 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 sleeve 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 resistance 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 resistance with one end of the test box 2, so as to complete the fixed connection between the cover plate 4 and the test box 2.

[0055] At the same time, one end of the locking rod 14 pushes the sealing plate 25 to come into contact with the sealing groove 1 23 and squeezes the rubber sealing gasket 1 24 to deform. At the same time, the rubber sealing gasket 1 24 is deformed by the force and fills the interior of the sealing groove 1 23, thereby forming a seal between the partition plate 6 and the partition opening 5.

[0056] Then, the electric push rod 22 is activated to drive the pressing plate 20 to move along the inner wall of the test chamber 3, and the two opposing pressing plates 20 are pushed to move closer to each other, so that the two opposing pressing plates 20 squeeze the soil inside the test chamber 3. At the same time, when the pressing plate 20 pushes the soil, it is set to cause the pressing plate 20 to drive the pressure sensor 21 to form a resistance 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;

[0057] Finally, by pulling out the shaping rod 8 and pulling one end of the air guide tube 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 guide tube 9, and the pressurized gas is sequentially introduced into the upper, middle and lower soil layers inside the test chamber 3 through the air guide tube 9, and the soil is stressed to produce cracks. Then, the air guide tube 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, the tracer gas pump 13 sequentially inputs the tracer gas into the upper, middle and lower soil layers inside the test chamber 3 through the tracer tube 10, 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 cover of the test box (2) is provided with a cover plate (4), a pair of partitions (5) are symmetrically provided on one side of the test chamber (3), a partition plate (6) is inserted into the interior of the partition (5), and a socket (7) is provided at one end of each of the cover plate (4) and the partition plate (6), and 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 air guide tube (9) A gas flow meter (11) is fixedly connected to the input end of the tracer tube (10), one end of the base (1) is fixedly connected to a pressure pump (12), and the other end of the base (1) is fixedly connected to a tracer air pump (13), the pressure pump (12) and the tracer air pump (13) are fixedly connected to the air guide tube (9) and the tracer tube (10) through pipelines, one end of the cover plate (4) is installed with a locking assembly for fixed connection to the test box (2), and three sets of pressing assemblies for compacting soil samples are installed inside the test chamber (3); The locking assembly comprises a pair of locking rods (14) symmetrically hinged at one end of the cover plate (4), the bottom of the locking rods (14) is fixedly connected to a locking bevel (15), the bottom of the test box (2) is symmetrically fixedly connected to a locking bevel (16) adapted to the locking bevel (15), one end of the locking rods (14) is provided with a locking socket (17), one end of the test box (2) is fixedly connected to a locking screw (18) adapted to the locking socket (17), and one end of the locking screw (18) is threadedly connected to a locking nut (19); The pressing assembly comprises pressing plates (20) symmetrically mounted inside the test chamber (3), two adjacent pressing plates (20) are fixedly connected to opposite sides with pressure sensors (21), one end of the test box (2) is symmetrically fixedly connected to an electric push rod (22), and the output end of the electric push rod (22) is fixedly connected to the pressing plate (20); Filling the interior of the test chamber (3) with soil, and sequentially pulling one end of the partition plate (6) from bottom to top through the partition opening (5) and inserting it into the interior of the test chamber (3), so that the plurality of partition plates (6) divide the interior space of the test chamber (3) into three layers: upper, middle, and lower layers; 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 opposing pressing plates (20) are pushed to move closer to each other, so that the pressing plate (20) drives the pressure sensor (21) to form a resistance 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.

2. A 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), the interior of the sealing groove (23) is fixedly connected to a rubber sealing gasket (24), and one end of the partition plate (6) is fixedly connected to a sealing plate (25) adapted to the sealing groove (23).

3. The fracturing simulation permeability experimental device according to claim 1, characterized in that: A supporting chute (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 supporting chute (26).

4. 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 to the interior of the second sealing groove (27).

5. 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).

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

Images