Dynamic simulation system for performance of pre-splitting fracturing fluid of thick and hard key layer

Abstract

The invention discloses a dynamic simulation system for the performance of a pre-splitting fracturing fluid of a thick and hard key layer, and relates to the technical field of fracturing fluid performance simulation. The clamping device comprises a clamping device body, one end of the clamping device body is fixedly connected with a bottom plate, the outer wall of the other end of the clamping device body is fixedly connected with a fixing plate, and a rock core plug is installed on one side of the fixing plate. The clamping and fixing assembly is arranged, after a rock core sample is placed in the holder body, the interior of a fixing block is pressurized through an air inlet by means of a high-pressure air pump, so that two clamping plates can be pushed to be attached to the rock core sample through a sealing plate, and a sealing air cushion can be inflated and expanded together through an air conveying pipe; according to the clamp holder, the core sample can be stabilized in the clamp holder body, so that the stability and the sealing performance of the core sample in the clamp holder body are greatly improved, the clamp holder body can adapt to different sizes of different core samples, and the flexibility and the universality of an experiment are improved.

Description

Technical Field

[0001] The present application relates to the technical field of fracturing fluid performance simulation, and in particular to a dynamic simulation system for pre-fracture fracturing fluid performance in thick and hard critical layers. Background Art

[0002] Fracturing fluid refers to a heterogeneous and unstable chemical system formed by a variety of additives in a certain ratio. Its main function is to transfer the high pressure formed by ground equipment to the formation, causing the formation to break and form cracks and transport proppant along the cracks. In daily simulation of real formation conditions, dynamic simulation of the performance of pre-fracture fracturing fluid in thick and hard key layers is generally used to evaluate the performance of fracturing fluid under high pressure and high temperature environment.

[0003] In the coal mining field, hydraulic measures represented by hydraulic fracturing are widely used to increase the permeability of coal seams. Optimization of hydraulic fracturing parameters is the key to achieving ideal economic benefits, involving multiple dimensions such as fracturing section design parameters and construction parameters. Therefore, the dynamic simulation system can help researchers and engineers intelligently find the best matching set of fracturing parameters to improve fracturing efficiency and effect. Existing simulation systems usually contain a series of precision equipment, such as core clamps, presses, constant temperature boxes, constant speed and pressure pumps, intermediate containers and various valves. Among them, the role of the clamp is particularly critical. It not only needs to fix the core sample, but also ensures the sealing in the high-pressure experiment to ensure the accuracy and safety of the experiment.

[0004] However, when using a traditional core holder, the core sample is usually simply stuffed into the holder, which often results in insufficient stability and sealing of the holder for the core sample. In addition, due to the different sizes of different core samples, traditional holders are difficult to adapt to cores of various specifications, which limits the flexibility and breadth of the experiment. For this reason, the present application provides a dynamic simulation system for the performance of pre-fracture fracturing fluid in thick and hard critical layers. Summary of the invention

[0005] The purpose of this application is to solve the problem that the stability and sealing of the clamp to the core sample are insufficient, which limits the flexibility and extensiveness of the experiment. This application provides a dynamic simulation system for the performance of pre-fracture fracturing fluid in thick and hard critical layers.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A dynamic simulation system for the performance of pre-fracture fracturing fluid for thick and hard key layers, comprising a clamp body, one end of the clamp body is fixedly connected to a base plate, the other end outer wall of the clamp body is fixedly connected to a fixing plate, one side of the fixing plate is installed with a core plug, one side of the core plug is symmetrically threaded with a plurality of nuts, the plurality of nuts can be threadedly connected to one side of the fixing plate, a liquid inlet is fixedly connected to the clamp body, a liquid outlet is fixedly connected to the clamp body, one end of the liquid inlet and the liquid outlet are both fixedly connected to a solenoid valve, two sides of the clamp body are symmetrically fixedly connected to fixing blocks, a clamping assembly is installed inside the fixing block, and a sealing air cushion is fixedly connected inside the clamp body.

[0007] By adopting the above technical solution, the core sample is inserted into the interior of the clamp body, at which time the fixing plate and the core plug can be fitted, and one end of the clamp body can be sealed through the core plug by screwing a plurality of nuts in the opposite direction. After the core sample is placed in the interior of the clamp body, the clamping assembly inside the fixing block can be started to operate, and core samples of different sizes and models can be fixed in the interior of the clamp body through the operation of the clamping assembly. At the same time, when the clamping assembly is operating, the sealing air cushion can also be inflated, thereby greatly improving the stability and sealing of the core sample in the clamp body, and also enabling the clamp body to adapt to different sizes of core samples, thereby improving the flexibility and extensiveness of the experiment.

[0008] Furthermore, the clamping assembly includes an air inlet fixedly connected to one side of the two fixed blocks, one end of the air inlet is fixedly connected to a solenoid valve 2, one side of the two fixed blocks is penetrated and fixedly connected with an air supply pipe, the ends of the two air supply pipes away from the fixed blocks are penetrated and fixedly connected with a sealing air cushion, the interior of the two fixed blocks is slidably connected with a sealing plate, and a clamping part is provided on one side of the sealing plate.

[0009] By adopting the above technical solution, the interior of the fixed block is inflated through the air inlet by a high-pressure air pump. At this time, the impact force of the air pump will push the sealing plate to move inside the fixed block, so that the sealing plate is gradually separated from one end of the air pipe. At this time, the gas will gradually enter the interior of the sealing air cushion through the air pipe, causing the sealing air cushion to gradually inflate and expand.

[0010] Furthermore, a connecting column is fixedly connected to one side of the sealing plate, the connecting column penetrates and is slidably connected to the inside of the clamp body, and a clamping plate is fixedly connected to one end of the connecting column away from the sealing plate.

[0011] By adopting the above technical solution, the two connecting columns are used to push the two clamps closer to each other inside the clamp body, so that the two clamps fit the core sample, so that the clamp body can adapt to different sizes of core samples, thereby improving the flexibility and breadth of the experiment.

[0012] Furthermore, the inner walls of the two clamping plates are fixedly connected with rubber pads, the side of the sealing plate away from the connecting column is fixedly connected with a spring 1, and the end of the spring 1 away from the sealing plate is fixedly connected to one side of the inner wall of the fixed block.

[0013] By adopting the above technical solution, the friction between the clamping plate and the core sample can be increased by setting the rubber pad, thereby improving the clamping stability. After the pressure inside the fixed block is released, the sealing plate can be pulled to reset through one side of the spring.

[0014] Furthermore, the clamping component includes a connecting block fixedly connected to one side of the sealing plate, a groove is provided on one side of the connecting block, a spring 2 is fixedly connected inside the groove, a clamping block is slidably connected inside the groove, one end of the spring 2 is fixedly connected to one end of the groove, and a plurality of clamping grooves are provided on one side of the interior of the fixed block.

[0015] By adopting the above technical solution, when the two clamps are clamped stably according to the size of the core sample, the clamping block and one of the slots will be on the same horizontal line, and the clamping block will be pushed into the corresponding slot according to spring 2 to effectively stabilize the position of the two clamps.

[0016] Furthermore, one end of the clamping block away from the second spring is arc-shaped, and the shape and size of the clamping slot are consistent with the arc-shaped end of the clamping block.

[0017] By adopting the above technical solution, after the influence of air pressure is lost, the card block and the card slot can be separated through the arc-shaped guidance of the card block and the card slot.

[0018] Furthermore, a pressure sensor is fixedly connected to one side of the base plate, the pressure sensor is located inside the clamp body, the pressure sensor is electrically connected to an external controller, and the solenoid valve 1 is electrically connected to the external controller.

[0019] By adopting the above technical solution, the pressure condition inside the clamp body can be checked in real time through the pressure sensor. At the same time, when the pressure deviation is detected, the pressure inside the clamp body can be precisely controlled by controlling the solenoid valve one through the external controller.

[0020] Furthermore, a plurality of guide grooves are evenly formed on the inner wall of the clamp body.

[0021] By adopting the above technical solution, the flow of the fracturing fluid in the core sample can be guided by the multiple guide grooves, thereby ensuring the uniform distribution and effective penetration of the fluid in the experiment.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. The present application is provided with a clamping assembly. When the core sample is placed inside the clamp body, a high-pressure air pump is used to pressurize the inside of the fixed block through the air inlet, so that the two clamping plates can be pushed to fit the core sample through the sealing plate, and the sealing air cushion can be inflated through the air pipe at the same time, so that the clamp body can firmly hold the core sample inside the clamp body, greatly improving the stability and sealing of the core sample inside the clamp body, so that the clamp body can adapt to different sizes of core samples, and improve the flexibility and breadth of the experiment.

[0023] 2. The present application is provided with a clamping piece. As the sealing plate moves inside the fixed block, it will drive the clamping plate to clamp and stabilize the core sample according to the size of the core sample. When stabilized, the clamping block and one of the clamping slots will be on the same horizontal line. At this time, the positions of the two clamping plates can be effectively stabilized through the coordination of the clamping block, the clamping slot and the air pressure inside the fixed block, so that the core sample can be firmly stabilized inside the clamp body, reducing the possibility of shaking of the core sample during the experiment.

[0024] 3. The present application is provided with a pressure sensor and a guide groove. The high-pressure fluid replenishment pump is started through the software to pressurize the inside of the clamp body to the pressure value required for the experiment. At this time, the pressure situation inside the clamp body can be checked in real time through the pressure sensor. At the same time, when the pressure deviation is identified, the pressure inside the clamp body can be precisely controlled by controlling the solenoid valve through an external controller. In addition, the multiple guide grooves can be used to guide the flow of fracturing fluid in the core sample to ensure uniform distribution and effective penetration of the fluid in the experiment. 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 cross-sectional view of the main body of the device in this application.

[0027] Figure 3 It is a schematic diagram of the connection structure of the device body in this application.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the clamping assembly in this application.

[0029] Figure 5 It is a schematic diagram of the internal structure of the clamping assembly in this application.

[0030] Figure 6 It is a cross-sectional view of the card connector in this application.

[0031] Description of reference numerals: 1. Clamp body; 2. Bottom plate; 3. Fixing plate; 4. Core plug; 5. Nut; 6. Liquid inlet; 7. Liquid outlet; 8. Solenoid valve 1; 9. Fixing block; 10. Air inlet; 11. Solenoid valve 2; 12. Sealing air cushion; 13. Air pipe; 14. Sealing plate; 15. Connecting column; 16. Clamping plate; 17. Rubber pad; 18. Spring 1; 19. Connecting block; 20. Groove; 21. Spring 2; 22. Block; 23. Slot; 24. Pressure sensor; 25. Guide groove. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 —6 Provide further details of this application.

[0033] The embodiment of the present application discloses a dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers.

[0034] Reference Figure 1 , Figure 2 and Figure 3 A dynamic simulation system for the performance of pre-fracture fracturing fluid for thick and hard key layers comprises a clamp body 1, one end of the clamp body 1 is fixedly connected to a bottom plate 2, the outer wall of the other end of the clamp body 1 is fixedly connected to a fixing plate 3, a core plug 4 is installed on one side of the fixing plate 3, one side of the core plug 4 is symmetrically threaded with multiple nuts 5, and the multiple nuts 5 can be threadedly connected to one side of the fixing plate 3, a liquid inlet 6 is fixedly connected to the clamp body 1, a liquid outlet 7 is fixedly connected to the clamp body 1, one end of the liquid inlet 6 and the liquid outlet 7 are both fixedly connected to an electromagnetic valve 8, both sides of the clamp body 1 are symmetrically fixedly connected to fixing blocks 9, a clamping assembly is installed inside the fixing block 9, a sealing air cushion 12 is fixedly connected to the inside of the clamp body 1, a pressure sensor 24 is fixedly connected to one side of the bottom plate 2, the pressure sensor 24 is located inside the clamp body 1, the pressure sensor 24 is electrically connected to an external controller, and the electromagnetic valve 8 is electrically connected to the external controller.

[0035] When conducting a simulation, first prepare the core samples, materials, water, etc. required for the experiment before the experiment, configure the fracturing fluid required for the experiment, then close all valves in the equipment, pour the fracturing fluid into the suction tank of the high-pressure fluid replenishment pump, then open the constant temperature box and adjust it to a suitable temperature, then take out the core sample for the experiment, and release the connection between the fixing plate 3 and the core plug 4 by screwing a plurality of nuts 5, so that the core plug 4 and the nuts 5 are separated from the fixing plate 3, and then insert the core sample into the interior of the clamp body 1. At this time, the fixing plate 3 and the core plug 4 can be fitted together, and one end of the clamp body 1 can be sealed through the core plug 4 by screwing a plurality of nuts 5 in the opposite direction. After the core sample is placed in the interior of the clamp body 1, the clamping assembly inside the fixing block 9 can be started to operate, and the operation of the clamping assembly can be used to clamp cores of different sizes The core sample of No. is firmly fixed inside the clamp body 1. At the same time, when the clamping assembly is running, the sealing air cushion 12 can also be inflated, thereby greatly improving the stability and sealing of the core sample inside the clamp body 1. At the same time, the clamp body 1 can also adapt to the different sizes of core samples, thereby improving the flexibility and extensiveness of the experiment. When the core sample is clamped stably, the medium in the container can be injected into the clamp body 1 through the liquid injection pump connected to the liquid inlet 6, so as to test the relevant liquid permeability, and then the clamp body 1 is placed in the thermostatic box and the thermostatic box door is closed. The temperature of the thermostatic box is set according to the experimental requirements. After the temperature of the thermostatic box reaches the set stability, the confining pressure can be first injected into the filtration loss clamp through the ring pressure tracking pump, and then the back pressure pressure can be injected through the back pressure control pump; Secondly, when doing the dynamic filtration test of fracturing fluid, the core sample will be exposed to the fracturing fluid. At this time, the high-pressure fluid replenishment pump is started through the software to pressurize the inside of the clamp body 1 to the pressure value required for the experiment, and the pressure sensor 24 is used to check the pressure situation in real time, and then the high-pressure circulation pump is started to make the fracturing fluid shear flow on the end face of the core sample and the core end face. At the same time, a filter cake is formed on the core end face under the action of the pressure difference, and part of the test liquid seeps out from the other end of the core through the filter cake. The damage of the test liquid to the formation permeability is evaluated under the real simulation of the formation conditions. After the core end face is filtered out for a period of time according to the experimental requirements, the solenoid valve 8 can be opened to relieve the pressure inside the clamp body 1, and finally the temperature control temperature of the thermostat is set to room temperature. After the temperature of the thermostat drops to room temperature, the thermostat is opened to perform the core permeability test on the core sample after filtration damage.

[0036] Reference Figure 1 , Figure 4 and Figure 5The clamping assembly includes an air inlet 10 fixedly connected to one side of the two fixed blocks 9, one end of the air inlet 10 is fixedly connected to a solenoid valve 2 11, one side of the two fixed blocks 9 is penetrated and fixedly connected with an air pipe 13, the ends of the two air pipes 13 away from the fixed blocks 9 are penetrated and fixedly connected with a sealing air cushion 12, the inside of the two fixed blocks 9 are slidably connected with a sealing plate 14, one side of the sealing plate 14 is provided with a clamping piece, one side of the sealing plate 14 is fixedly connected with a connecting column 15, the connecting column 15 penetrates and is slidably connected inside the clamp body 1, the end of the connecting column 15 away from the sealing plate 14 is fixedly connected with a clamp 16, the inner walls of the two clamps 16 are fixedly connected with rubber pads 17, the side of the sealing plate 14 away from the connecting column 15 is fixedly connected with a spring 18, and the end of the spring 18 away from the sealing plate 14 is fixedly connected to one side of the inner wall of the fixed block 9.

[0037] When in use, first open one of the solenoid valves 11, so that one of the air inlets 10 is connected to the external high-pressure air pump, and then the high-pressure air pump is used to inflate the interior of the fixed block 9 through the air inlet 10. At this time, the impact force of the air pump will push the sealing plate 14 to move inside the fixed block 9, so that the sealing plate 14 is gradually separated from one end of the air supply pipe 13. At this time, the gas will gradually enter the interior of the sealing air cushion 12 through the air supply pipe 13, so that the sealing air cushion 12 is gradually inflated and expanded, so that the sealing effect inside the clamp body 1 is maintained by the expanded sealing air cushion 12, and the leakage of liquid and gas is reduced. When the sealing plate 14 is pushed to move, the sealing The guidance of the plate 14 will also push the connecting column 15 to slide, so as to push the two clamping plates 16 to be close to each other inside the clamp body 1 through the two connecting columns 15. When the two rubber pads 17 on one side of the two clamping plates 16 are in contact with the core sample, the inflation into the fixing block 9 can be stopped, and then the solenoid valve 11 is closed to prevent air pressure leakage, so that the clamp body 1 can stabilize the core sample inside the clamp body 1, and at the same time, the sealing air cushion 12 can be inflated, which greatly improves the stability and sealing of the core sample inside the clamp body 1, so that the clamp body 1 can adapt to different sizes of core samples, thereby improving the flexibility and breadth of the experiment.

[0038] Reference Figure 4 , Figure 5 and Figure 6 The clamping member includes a connecting block 19 fixedly connected to one side of the sealing plate 14, a groove 20 is provided on one side of the connecting block 19, a spring 21 is fixedly connected inside the groove 20, a clamping block 22 is slidably connected inside the groove 20, one end of the spring 21 is fixedly connected to one end of the groove 20, a plurality of clamping grooves 23 are provided on one side of the interior of the fixed block 9, the end of the clamping block 22 away from the spring 21 is arc-shaped, and the shape and size of the clamping groove 23 are consistent with the arc-shaped end of the clamping block 22.

[0039] When in use, as the sealing plate 14 moves inside the fixed block 9, the connecting block 19 is also driven to move. During the movement of the connecting block 19, the block 22 is firstly pushed into the interior of the groove 20 by squeezing the inner wall of the fixed block 9. Since a plurality of slots 23 are provided on one side of the fixed block 9, and the shape and size of the slots 23 are consistent with the arc-shaped end of the block 22, when the two clamping plates 16 are clamped stably according to the size of the core sample, the block 22 and one of the slots 23 are at the same horizontal line. At this time, according to the rebound contraction of the spring 21, the block 22 is pushed into the interior of the corresponding slot 23, so that the block 22, the slot 23 and the air inside the fixed block 9 are pressed together. The cooperation of pressure can effectively stabilize the position of the two clamps 16, so that the core sample can be firmly stabilized inside the clamp body 1, and when the subsequent simulation is completed, the solenoid valve 11 can be opened to discharge the air pressure inside the fixed block 9. At this time, after the influence of air pressure is lost, the sealing plate 14 will be pulled to move by the spring 18. At this time, the arc-shaped guidance of the block 22 and the slot 23 will separate the block 22 from the slot 23, so as to release the clamping connection between the block 22 and the slot 23, so that the sealing plate 14 is reset inside the fixed block 9, and when the sealing plate 14 moves and resets, it will drive the clamps 16 to move away from each other through the connecting column 15 to release the clamping of the core sample.

[0040] Reference Figure 1 and Figure 2 A plurality of guide grooves 25 are evenly arranged on the inner wall of the clamp body 1 .

[0041] When in use, the multiple guide grooves 25 can guide the flow of the fracturing fluid in the core sample, ensuring uniform distribution and effective penetration of the fluid in the experiment.

[0042] The implementation principle of the dynamic simulation system for pre-fracture fracturing fluid performance of thick hard key layers in this embodiment is as follows: when conducting simulation, first prepare the core samples, materials, water, etc. required for the experiment before the experiment, configure the fracturing fluid required for the experiment, then close all valves in the equipment, pour the fracturing fluid into the suction tank of the high-pressure fluid replenishment pump, then open the thermostat and adjust it to a suitable temperature, then take out the core sample for the experiment, and release the connection between the fixing plate 3 and the core plug 4 by twisting a plurality of nuts 5, so that the core plug 4 and the nuts 5 are separated from the fixing plate 3, and then Then, the core sample is inserted into the interior of the clamp body 1. At this time, the fixing plate 3 can be fitted with the core plug 4. By screwing the multiple nuts 5 in the opposite direction, one end of the clamp body 1 can be sealed through the core plug 4. After the core sample is placed in the interior of the clamp body 1, one of the solenoid valves 11 can be opened to connect one of the air inlets 10 to the external high-pressure air pump. Then, the high-pressure air pump is used to inflate the interior of the fixed block 9 through the air inlet 10. At this time, the impact force of the air pump will push the sealing plate 14 inside the fixed block 9. The sealing plate 14 is moved so that the sealing plate 14 is gradually separated from one end of the gas pipe 13. At this time, the gas gradually enters the interior of the sealing air cushion 12 through the gas pipe 13, so that the sealing air cushion 12 is gradually inflated, so that the expanded sealing air cushion 12 can maintain the sealing effect inside the clamp body 1, reduce the leakage of liquid and gas, and when the sealing plate 14 is pushed to move, the connecting column 15 is also pushed to slide through the guidance of the sealing plate 14, so that the two clamping plates 16 are pushed on the clamp body 1 through the two connecting columns 15. The inside of the clamp body 1 is close to each other, and when the two rubber pads 17 on one side of the two clamps 16 are in contact with the core sample, the inflation of the fixed block 9 can be stopped, and then the electromagnetic valve 11 is closed to prevent air pressure leakage, so that the clamp body 1 can stabilize the core sample inside the clamp body 1, and at the same time, the sealing air cushion 12 can be inflated, which greatly improves the stability and sealing of the core sample inside the clamp body 1, so that the clamp body 1 can adapt to different sizes of core samples, thereby improving the flexibility and extensiveness of the experiment; In addition, as the sealing plate 14 moves inside the fixed block 9, the connecting block 19 is also driven to move. During the movement of the connecting block 19, the inner wall of the fixed block 9 is squeezed to make the block 22 enter the interior of the groove 20 first. Since a plurality of slots 23 are provided on one side of the fixed block 9, and the shape and size of the slots 23 are consistent with the arc-shaped end of the block 22, when the two clamping plates 16 are clamped stably according to the size of the core sample, the block 22 and one of the slots 23 will be on the same horizontal line. At this time, according to the rebound contraction of the spring 21, the block 22 will be pushed into the interior of the corresponding slot 23, so that the block 22, the slot 23 and the internal air pressure of the fixed block 9 are pressed together. The cooperation of the two clamping plates 16 can effectively stabilize the positions of the two clamping plates 16, so that the core sample can be firmly and stably fixed inside the clamp body 1. When the subsequent simulation is completed, the electromagnetic valve 2 11 can be opened to discharge the air pressure inside the fixed block 9. After the air pressure is lost, the sealing plate 14 will be pulled to move by the spring 18. At this time, the arc-shaped guidance of the clamping block 22 and the clamping groove 23 will separate the clamping block 22 from the clamping groove 23, so as to release the clamping connection between the clamping block 22 and the clamping groove 23, so that the sealing plate 14 is reset inside the fixed block 9. When the sealing plate 14 moves and resets, it will drive the clamping plates 16 to move away from each other through the connecting column 15 to release the clamping of the core sample. When the core sample is clamped stably, the medium in the container can be injected into the clamp body 1 through the liquid injection pump connected to the liquid inlet 6 to test the relevant liquid permeability. Then, the clamp body 1 is placed in a constant temperature box and the door of the constant temperature box is closed. The temperature of the constant temperature box is set according to the experimental requirements. After the constant temperature reaches the set stability, the confining pressure can be first injected into the filtration clamp through the ring pressure tracking pump, and then the back pressure pressure can be injected through the back pressure control pump. Secondly, when doing the dynamic filtration test of fracturing fluid, the core sample will be exposed to the fracturing fluid. At this time, the high-pressure fluid replenishment pump is started through the software to pressurize the inside of the clamp body 1 to the pressure value required for the experiment, and the pressure sensor 24 is used to check the pressure situation in real time, and then the high-pressure circulation pump is started to make the fracturing fluid shear flow on the end face of the core sample and the core end face. At the same time, a filter cake is formed on the core end face under the action of the pressure difference, and part of the test liquid seeps out from the other end of the core through the filter cake. The damage of the test liquid to the formation permeability is evaluated under the real simulation of the formation conditions. After the core end face is filtered out for a period of time according to the experimental requirements, the solenoid valve 8 can be opened to relieve the pressure inside the clamp body 1, and finally the temperature control temperature of the thermostat is set to room temperature. After the temperature of the thermostat drops to room temperature, the thermostat is opened to perform the core permeability test on the core sample after filtration damage.

Claims

1. A dynamic simulation system for the performance of pre-fracture fluid in thick and hard critical layers, comprising a holder body (1), characterized in that: One end of the clamp body (1) is fixedly connected to a base plate (2), and the other end of the outer wall of the clamp body (1) is fixedly connected to a fixing plate (3), one side of the fixing plate (3) is installed with a core plug (4), one side of the core plug (4) is symmetrically threaded with a plurality of nuts (5), and the plurality of nuts (5) can be threadedly connected to one side of the fixing plate (3), the clamp body (1) is fixedly connected to a liquid inlet (6), the clamp body (1) is fixedly connected to a liquid outlet (7), one end of the liquid inlet (6) and the liquid outlet (7) are both fixedly connected to a solenoid valve (8), the two sides of the clamp body (1) are symmetrically fixedly connected to fixing blocks (9), a clamping assembly is installed inside the fixing block (9), and a sealing air cushion (12) is fixedly connected inside the clamp body (1).

2. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 1, characterized in that: The clamping assembly comprises an air inlet (10) fixedly connected to one side of two fixed blocks (9), one end of the air inlet (10) is fixedly connected to a second solenoid valve (11), one side of the two fixed blocks (9) is penetrated and fixedly connected to an air supply pipe (13), one end of the two air supply pipes (13) away from the fixed blocks (9) is penetrated and fixedly connected to a sealing air cushion (12), and the inside of the two fixed blocks (9) is slidably connected to a sealing plate (14), and one side of the sealing plate (14) is provided with a clamping member.

3. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 2, characterized in that: A connecting column (15) is fixedly connected to one side of the sealing plate (14), the connecting column (15) penetrates and is slidably connected to the inside of the clamp body (1), and a clamping plate (16) is fixedly connected to one end of the connecting column (15) away from the sealing plate (14).

4. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 3, characterized in that: The inner walls of the two clamping plates (16) are fixedly connected with rubber pads (17), the side of the sealing plate (14) away from the connecting column (15) is fixedly connected with a spring 1 (18), and the end of the spring 1 (18) away from the sealing plate (14) is fixedly connected to the inner wall of the fixing block (9).

5. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 2, characterized in that: The clamping member comprises a connecting block (19) fixedly connected to one side of the sealing plate (14); a groove (20) is provided on one side of the connecting block (19); a second spring (21) is fixedly connected inside the groove (20); a clamping block (22) is slidably connected inside the groove (20); one end of the second spring (21) is fixedly connected to one end of the groove (20); and a plurality of clamping grooves (23) are provided on one side of the interior of the fixing block (9).

6. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 5, characterized in that: One end of the clamping block (22) away from the second spring (21) is arc-shaped, and the shape and size of the clamping slot (23) are consistent with the arc-shaped end of the clamping block (22).

7. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 1, characterized in that: A pressure sensor (24) is fixedly connected to one side of the base plate (2), the pressure sensor (24) is located inside the clamp body (1), the pressure sensor (24) is electrically connected to an external controller, and the solenoid valve 1 (8) is electrically connected to the external controller.

8. A dynamic simulation system for pre-fracture fluid performance in thick and hard critical layers according to claim 1, characterized in that: The inner wall of the clamp body (1) is evenly provided with a plurality of guide grooves (25).

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