Shale multi-stage combined pressure-drive integrated simulation device for shale gas exploitation

Abstract

The invention discloses a shale multi-stage combined pressure-drive integrated simulation device for shale gas exploitation, and relates to the technical field of shale gas simulation exploitation, the shale multi-stage combined pressure-drive integrated simulation device comprises a box body, a cover plate and a rotating plate, one side of the box body is provided with a controller, and the top of the box body is movably provided with the cover plate through a hinge; the device comprises a cover plate, through holes are symmetrically formed in the top of the cover plate in a penetrating manner, a round rod is mounted at the top of the cover plate, a rotating plate is movably mounted on the outer side of the round rod, a plurality of first pipelines are movably mounted at the top of the rotating plate in a penetrating manner, silica gel cushions are mounted at the bottoms of the first pipelines, and a storage groove is formed in the bottom of the rotating plate in a penetrating manner; and a movable drilling mechanism is arranged at the top of the cover plate. The rotating plate rotates to a proper position, so that the drill rod can drill rocks in different directions, and the situation that the rocks cannot be effectively drilled due to the fact that the hardness of the rocks in a certain direction is too high is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of shale gas simulation mining, and in particular to a shale multi-stage combined pressure-driven integrated simulation device for shale gas mining. Background Art

[0002] When shale gas is extracted, a drill pipe is used to drill into the rock, and then high-pressure water is injected into the rock to fracture the rock. In order to study the state of the rock during shale gas extraction, simulation experiments are needed to analyze the stress conditions of the rock.

[0003] The defects of existing shale gas extraction simulation devices are:

[0004] 1. Prior art KR1020030049386A discloses a nighttime soil storage and fermentation tank. This technology is not convenient for drilling holes in different directions on the top of the rock when storing rock. When it is needed to simulate a fracturing experiment for shale gas extraction, the hardness of different parts of the rock varies, making it inconvenient to drill holes in appropriate directions of the rock stored inside as needed. Therefore, a shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction is needed to solve this problem, which allows for convenient drilling of different directions on the top of the rock when storing rock.

[0005] 2. The prior art JP2005306443A discloses an excavated soil storage container. This technology does not have the function of drilling holes and injecting water at different locations on the top of the rock. It is unable to inject high-pressure water from different locations on the top of the rock to perform fracturing experiments on the interior of the rock. Therefore, it is not suitable for the function of drilling holes at different locations on the top of the rock. Therefore, a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction is needed to solve this problem. The device can drill holes at different locations on the top of the rock to inject water into rock holes at different locations.

[0006] 3. The prior art CN208433157U discloses a new type of simulation experimental device for shale gas reservoir exploitation. This technology does not have the function of detecting the internal rock pressure of holes at different orientations on the top of the rock. When conducting water injection and fracturing experiments inside the rock, it is inconvenient to insert pressure detection components from different orientations on the top of the rock to detect the pressure of the rock. Therefore, a shale multi-stage combined pressure-drive integrated simulation device for shale gas exploitation that can insert holes at different orientations on the top of the rock to detect the pressure inside the rock is needed to solve this problem.

[0007] 4. The prior art CN214122230U discloses a shale gas extraction through fault casing simulation device. This technology does not simulate the interaction forces exerted on various parts of underground rocks. Underground rocks are subjected to interaction forces. In the simulation experiment, there is no force exerted by other rocks around the rocks, resulting in the rocks being subjected to different conditions from those underground during the fracturing experiment. Therefore, a shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction that can simulate the interaction forces exerted on rocks underground is needed to solve this problem. Summary of the Invention

[0008] One purpose of the present application is to provide a shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction, which can solve the technical problems raised in the prior art.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction, comprising a box, a cover plate, and a rotating plate; a controller is mounted on one side of the box; a cover plate is movably mounted on the top of the box via a hinge; openings are symmetrically formed through the top of the cover plate; a round rod is mounted on the top of the cover plate; a rotating plate is movably mounted on the outside of the round rod; a plurality of pipes 1 are movably mounted through the top of the rotating plate; a silicone cushion is mounted on the bottom of the pipes 1; and a storage groove is formed through the bottom of the rotating plate;

[0010] A movable drilling mechanism is provided on the top of the cover plate.

[0011] Preferably, multiple electric telescopic rods are symmetrically installed on both sides of the box, and the electric telescopic rod is connected to the controller by electrical signals. A push rod is installed at the output end of the electric telescopic rod, and a pressure sensor is installed at one end of the push rod, and the pressure sensor is connected to the controller by electrical signals. The pressure sensor is located inside the box, and a pressure plate is installed at the input end of the pressure sensor.

[0012] Preferably, a plurality of electric telescopic rods 2 are symmetrically installed on the front of the box body 1, and the electric telescopic rods 2 are connected to the controller electrical signal. A push rod 2 is installed at the output end of the electric telescopic rod 2, and a pressure sensor 2 is installed at one end of the push rod 2, and the pressure sensor 2 is connected to the controller electrical signal, and the pressure sensor 2 is located inside the box body, and a pressure frame is installed at the input end of the pressure sensor 2, and the pressure frame is located on the inner side of the pressure plate 1, a spring is installed through one side of the pressure frame, and a pressure plate 2 is installed at one end of the spring, and the pressure plate 2 is located on the inner side of the pressure frame.

[0013] Preferably, the mobile drilling mechanism includes a guide rod, a movable plate, a hydraulic cylinder, a lifting plate, a motor and a drill rod. The guide rod is installed on the top of the rotating plate, and the movable plate is movably installed on the outer side of the guide rod. The front of the movable plate is installed with a hydraulic cylinder, and the hydraulic cylinder is connected to the controller by electrical signals. The lifting plate is installed at the output end of the hydraulic cylinder, and the bottom of the lifting plate is installed with a motor, and the motor is connected to the controller by electrical signals. The drill rod is installed at the output end of the motor, and the drill rod is located above the pipe.

[0014] Preferably, a right-angle plate 1 is installed on one side of the rotating plate, a hydraulic cylinder 2 is installed on one side of the right-angle plate 1, the hydraulic cylinder 2 is connected to the controller electrical signal, a movable plate 2 is installed on the output end of the hydraulic cylinder 2, an electric telescopic rod 3 is installed on one side of the movable plate 2, and the electric telescopic rod 3 is connected to the controller electrical signal.

[0015] Preferably, a closing plate is installed at the output end of the electric telescopic rod three, a rubber pad is installed at the bottom of the closing plate, and a pipe two is installed through the top of the closing plate.

[0016] Preferably, a right-angle plate 2 is symmetrically installed on the top of the closing plate, a motor 2 is installed on the top of the right-angle plate 2, and the motor 2 is connected to the controller electrical signal, a screw rod is installed on the output end of the motor 2, one end of the screw rod passes through the top of the closing plate, a lifting block is installed on the outside of the screw rod, a pressure sensor 3 is installed on the bottom of the lifting block, and the pressure sensor 3 is connected to the controller electrical signal, and a detection rod is installed on the bottom input end of the pressure sensor 3.

[0017] Preferably, a hydraulic pump is installed on the top of the rotating plate, and the hydraulic pump is connected to the controller via an electrical signal. A hose is installed at the output end of the hydraulic pump, and the output end of the hose is connected to the input end of the second pipeline.

[0018] Preferably, the method for using the shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction is as follows:

[0019] S1. Put the rock into the box, then the first pressing plate moves inward to limit and squeeze the two sides of the rock, and the pressing frame and the second pressing plate squeeze and limit the front of the rock;

[0020] S2. The rotating plate is then rotated to an appropriate position, and the drill rod is then moved downward into the pipe 1 and continues to move downward to drill the rock inside the box, and drills the rocks under multiple pipes 1 respectively;

[0021] S3, by moving the closing plate to the top of the pipe 1, then moving the closing plate downward, and then moving the detection rod downward to extend into the interior of the pipe 1 on both sides and continue to move downward to extend into the bottom of the hole in the rock;

[0022] S4. The hydraulic pump sucks the external water into the second pipe, and then the water enters the first pipe and enters the pores of the rock to perform a hydraulic fracturing experiment on the rock.

[0023] Preferably, the step S2 further includes the following steps:

[0024] S21. When the drill rod encounters a rock portion with high hardness and cannot be moved downward, the drill rod moves upward and then continues to rotate the rotating plate to allow the drill rod to drill rocks in other directions.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention enables the drill rod to drill rocks in different directions by rotating the rotating plate to an appropriate position, thereby avoiding the situation where the hardness of the rock in a certain direction is too high and the rock cannot be effectively drilled.

[0027] 2. The present invention uses a hydraulic pump to suck external water into pipe 2, and then the water enters pipe 1 and the holes in the rock. The rotation of the rotating plate can drive pipes 1 and 2 to rotate, which can conveniently drill holes in multiple positions of the rock and then inject water to perform fracturing experiments.

[0028] 3. The present invention moves the closing plate to the top of the pipe 1, then moves the closing plate downward, and then moves the detection rod downward to extend into the interior of the pipe 1 on both sides and continues to move downward to extend into the bottom of the hole in the rock, so that the detection rod and the pressure sensor 3 can be inserted into the rock in multiple directions to test the force inside the rock during the fracturing experiment, making the detection process more convenient.

[0029] 4. The present invention moves the first pressure plate inward to limit the extrusion on both sides of the rock, and the pressure frame and the second pressure plate squeeze and limit the front of the rock, thereby simulating the interaction force between various parts of the rock when it is underground, avoiding the situation where the simulation result is inaccurate due to the lack of pressure from other rocks on the outside of the rock during simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A perspective view of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the pressing plate 1 and the pressing frame of the present invention;

[0032] Figure 3 It is a front cross-sectional view of the cover plate of the present invention;

[0033] Figure 4 This is a schematic diagram of the press frame structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the cover plate and rotating plate structure of the present invention;

[0035] Figure 6 This is a structural diagram of a rotating plate and a right-angle plate according to the present invention;

[0036] Figure 7 This is a schematic diagram of the right-angle plate structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the closing plate structure of the present invention;

[0038] Figure 9 The figure is a flow chart of the method of using the present invention.

[0039] In the figure: 1, box; 2, controller; 3, electric telescopic rod 1; 4, push rod 1; 5, pressure sensor 1; 6, pressure plate 1; 7, electric telescopic rod 2; 8, push rod 2; 9, pressure sensor 2; 10, pressure frame; 11, spring; 12, pressure plate 2; 13, cover plate; 14, round rod; 15, opening; 16, rotating plate; 17, guide rod; 18, moving plate 1; 19, hydraulic cylinder 1; 20, lifting plate; 21, Motor 1; 22. Drill rod; 23. Pipe 1; 24. Right-angle plate 1; 25. Hydraulic cylinder 2; 26. Moving plate 2; 27. Electric telescopic rod 3; 28. Closing plate; 29. ​​Pipe 2; 30. Right-angle plate 2; 31. Motor 2; 32. Screw; 33. Lifting block; 34. Pressure sensor 3; 35. Probe rod; 36. Hydraulic pump; 37. Hose; 38. Rubber pad; 39. Silicone pad; 40. Storage slot. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] See also Figure 1 、 Figure 3 、 Figure 5 and Figure 6 , an embodiment provided by the present invention: a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction;

[0044] The invention comprises a box body 1, a cover plate 13 and a rotating plate 16. A controller 2 is installed on one side of the box body 1. The cover plate 13 is movably installed on the top of the box body 1 through a hinge. A through-hole 15 is symmetrically penetrated on the top of the cover plate 13. A round rod 14 is installed on the top of the cover plate 13. A rotating plate 16 is movably installed on the outside of the round rod 14. A plurality of pipes 23 are movably installed on the top of the rotating plate 16. A silicone cushion 39 is installed at the bottom of the pipe 23. A storage groove 40 is penetrated at the bottom of the rotating plate 16. The box body 1 can provide an installation position for other components of the equipment and can also provide a placement space for rocks. The controller 2 can receive signals from the pressure sensor 15, the pressure sensor 29 and the pressure sensor 34, and can also control the electric telescopic rod 3, the electric telescopic rod 27, the hydraulic cylinder 19, the motor 121, and the hydraulic Cylinder 25, electric telescopic rod 3 27, motor 2 31 and water pressure pump 36 are controlled, the cover plate 13 can close the top of the box body 1, the through port 15 can provide space for the downward movement of pipe 1 23, and provide a path for the downward movement of the drill rod 22 and the detection rod 35, the round rod 14 can provide an installation position for the rotating plate 16, the rotating plate 16 can rotate, so that the pipe 1 23 and the drill rod 22 can rotate, the drill rod 22 can move down to drill rocks in different directions, the pipe 1 23 can provide a path for water to enter the rock inside the box body 1, and can provide a path for the detection rod 35 to enter the rock inside the box body 1, the silicone cushion 39 can move down to contact the top of the rock, thereby filling and sealing the gap between the rock and pipe 1 23, and the storage groove 40 can provide a storage space for the silicone cushion 39.

[0045] See also Figure 1 、 Figure 5 and Figure 6 , an embodiment provided by the present invention: a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction;

[0046] The mobile drilling mechanism is provided on the top of the cover plate 13. The mobile drilling mechanism includes a guide rod 17, a mobile plate 18, a hydraulic cylinder 19, a lifting plate 20, a motor 21 and a drill rod 22. The guide rod 17 is installed on the top of the rotating plate 16. The outer side of the guide rod 17 is movably installed with a mobile plate 18. The front of the mobile plate 18 is installed with a hydraulic cylinder 19, and the hydraulic cylinder 19 is connected to the controller 2 by electrical signals. The output end of the hydraulic cylinder 19 is installed with a lifting plate 20. The bottom of the lifting plate 20 is installed with a motor 21, and the motor A motor 21 is electrically connected to the controller 2. A drill rod 22 is installed at the output end of the motor 21, and the drill rod 22 is located above the pipe 23. The guide rod 17 can provide a guide for the movable plate 18. The movable plate 18 can drive the hydraulic cylinder 19 to move left and right by moving left and right. The hydraulic cylinder 19 can drive the lifting plate 20 and the drill rod 22 to move up and down. The lifting plate 20 can provide an installation position for the motor 21. The motor 21 can drive the drill rod 22 to rotate, so that the drill rod 22 can drill holes in the rock inside the box 1 when it moves downward.

[0047] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , an embodiment provided by the present invention: a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction;

[0048] It includes an electric telescopic rod 1 3 and an electric telescopic rod 2 7. Multiple electric telescopic rods 3 are symmetrically installed on both sides of the box body 1, and the electric telescopic rod 3 is electrically connected to the controller 2. The output end of the electric telescopic rod 3 is installed with a push rod 1 4, and one end of the push rod 4 is installed with a pressure sensor 1 5, and the pressure sensor 5 is electrically connected to the controller 2, and the pressure sensor 5 is located inside the box body 1. The input end of the pressure sensor 5 is installed with a pressure plate 6. Multiple electric telescopic rods 2 7 are symmetrically installed on the front of the box body 1. The electric telescopic rod 2 7 is electrically connected to the controller 2. The output end of the electric telescopic rod 2 7 is installed with a push rod 2 8, and one end of the push rod 2 8 is installed with a pressure sensor 2 9, and the pressure sensor 2 9 is electrically connected to the controller 2, and the pressure sensor 2 9 is located inside the box body 1. The input end of the pressure sensor 2 9 is installed with a pressure frame 10, and the pressure frame 10 is located on the inner side of the pressure plate 6. A spring is installed through one side of the pressure frame 10. 11. A pressure plate 2 12 is installed at one end of the spring 11, and the pressure plate 2 12 is located on the inner side of the pressure frame 10. The electric telescopic rod 13 can drive the push rod 14 to move left and right, and the push rod 4 can drive the pressure plate 6 to move left and right by moving left and right. The pressure sensor 15 can detect the pressure of the pressure plate 6 on the rock, and the pressure plate 6 can squeeze and limit the two sides of the rock, simulating the mutual force between the various parts of the underground rock. The electric telescopic rod 27 can drive the push rod 28 to move back and forth, and the push rod 28 can drive the pressure frame 10 and the pressure plate 2 12 to move back and forth by moving back and forth. The pressure sensor 29 can detect the pressure of the pressure frame 10 and the pressure plate 2 12 on the rock. The pressure frame 10 can squeeze and limit the front of the rock and provide storage space for the pressure plate 2 12. The spring 11 can squeeze the pressure plate 2 12 so that the pressure plate 2 12 can move outward on both sides. The pressure plate 2 12 can squeeze and limit the front of rocks of different widths.

[0049] See also Figure 1 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , an embodiment provided by the present invention: a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction;

[0050] The rotary plate 16 includes a right-angle plate 24, a right-angle plate 24 installed on one side of the rotary plate 16, a hydraulic cylinder 25 installed on one side of the right-angle plate 24, the hydraulic cylinder 25 is connected to the controller 2 by electrical signals, the output end of the hydraulic cylinder 25 is installed with a mobile plate 26, one side of the mobile plate 26 is installed with an electric telescopic rod 3 27, and the electric telescopic rod 3 27 is connected to the controller 2 by electrical signals, the output end of the electric telescopic rod 3 27 is installed with a closing plate 28, the bottom of the closing plate 28 is installed with a rubber pad 38, the top of the closing plate 28 is penetrated by a pipe 29, and the right-angle plate 24 can be a hydraulic plate. The hydraulic cylinder 25 provides an installation position. The hydraulic cylinder 25 can drive the movable plate 26 to move left and right. The movable plate 26 can drive the closing plate 28, the pipe 2 29 and the detection rod 35 to move left and right by moving left and right. The electric telescopic rod 3 27 can drive the closing plate 28 to move up and down. The up and down movement of the closing plate 28 can drive the pipe 2 29 and the detection rod 35 to move up and down. The rubber pad 38 plays a sealing role and can fill the gap between the closing plate 28 and the pipe 1 23. The pipe 2 29 can provide a transmission path for the water in the hose 37 to enter the pipe 1 23.

[0051] See also Figure 1 、 Figure 6 、 Figure 7 and Figure 8 , an embodiment provided by the present invention: a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction;

[0052] The second right-angle plate 30 is symmetrically mounted on the top of the closing plate 28, the second motor 31 is mounted on the top of the second right-angle plate 30, and the second motor 31 is electrically connected to the controller 2, the output end of the second motor 31 is mounted with a screw rod 32, one end of the screw rod 32 passes through the top of the closing plate 28, a lifting block 33 is mounted on the outside of the screw rod 32, a pressure sensor 34 is mounted on the bottom of the lifting block 33, and the pressure sensor 34 is electrically connected to the controller 2, a detection rod 35 is mounted on the bottom input end of the pressure sensor 34, a water pressure pump 36 is mounted on the top of the rotating plate 16, and the water pressure pump 36 is electrically connected to the controller 2, a hose 37 is mounted on the output end of the water pressure pump 36, and the output end of the hose 37 is connected to the input end of the pipe 29 The two ends are connected, and the right-angle plate 2 30 can provide an installation position for the motor 2 31. The motor 2 31 can drive the screw rod 32 to rotate. The rotation of the screw rod 32 can drive the lifting block 33 to move up and down. The up and down movement of the lifting block 33 can drive the pressure sensor 34 and the detection rod 35 to move up and down. The pressure sensor 34 can detect the upward force applied to the detection rod 35, and then detect the upward force applied to the rock in the box 1, thereby detecting the pressure applied to the rock under the action of water pressure. The detection rod 35 can detect the pressure from the rock by being inserted into the hole in the rock. The water pressure pump 36 can pressurize the external water and transport it into the hose 37. The hose 37 can transmit the water in the water pressure pump 36 into the pipe 2 29, and then transmit it into the pipe 1 23.

[0053] The method of using the shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction is as follows:

[0054] S1. Place the rock into the box 1, then the pressing plate 1 6 moves inward to limit and squeeze the two sides of the rock, and the pressing frame 10 and the pressing plate 2 12 squeeze and limit the front of the rock;

[0055] S2. Then, the rotating plate 16 is rotated to an appropriate position, and then the drill rod 22 is moved downward to extend into the pipe 1 23 and continues to move downward to drill the rock inside the box 1, and drills the rocks under multiple pipes 1 23 respectively;

[0056] S3. The closing plate 28 is moved to the top of the pipe 1 23 and then moves downward. Then, the detection rod 35 moves downward and extends into the interior of the pipe 1 23 on both sides and continues to move downward and extends into the bottom of the hole in the rock.

[0057] S4. The hydraulic pump 36 sucks the external water into the second pipe 29, and then the water enters the first pipe 23 and enters the pores of the rock to perform a hydraulic fracturing experiment on the rock.

[0058] S2 also includes the following steps:

[0059] S21. When the drill rod 22 encounters a rock portion with high hardness and cannot move downward, the drill rod 22 moves upward and then continues to rotate the rotating plate 16 to allow the drill rod 22 to drill rocks in other directions.

[0060] Working principle: Before using the shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction, you should first check whether there are any problems that affect the use of the shale multi-stage combined pressure-driven integrated simulation device for shale gas extraction. Put the rock into the box 1, and then move the pressure plate 16 inward to limit and squeeze the two sides of the rock. The pressure frame 10 and the pressure plate 2 12 squeeze and limit the front of the rock. Then, the rotating plate 16 is rotated to the appropriate position, and then the drill rod 22 moves down and extends into the pipe 1 23 and continues to move down to drill the rock inside the box 1, and drills multiple pipes 23 respectively. The rock below is drilled. When the drill rod 22 encounters a rock with high hardness and cannot move down, the drill rod 22 moves up and continues to rotate the rotating plate 16 to make the drill rod 22 drill the rock in other directions. By moving the closing plate 28 to the top of the pipe 1 23, and then moving the closing plate 28 down, the detection rod 35 moves down and extends into the interior of the pipe 1 23 on both sides and continues to move down and extends into the bottom of the hole in the rock. The hydraulic pump 36 sucks the external water into the pipe 2 29, and then the water enters the pipe 1 23 and enters the hole in the rock to perform a hydraulic fracturing experiment on the rock.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the rights involved.

Claims

1. A shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction, characterized by: The invention comprises a box body (1), a cover plate (13) and a rotating plate (16), wherein a controller (2) is installed on one side of the box body (1), a cover plate (13) is movably installed on the top of the box body (1) through a hinge, a through-hole (15) is symmetrically opened through the top of the cover plate (13), a round rod (14) is installed on the top of the cover plate (13), a rotating plate (16) is movably installed on the outer side of the round rod (14), a plurality of pipes (23) are movably installed through the top of the rotating plate (16), a silicone soft pad (39) is installed at the bottom of the pipe (23), and a storage groove (40) is opened through the bottom of the rotating plate (16); A movable drilling mechanism is provided on the top of the cover plate (13).

2. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 1, characterized in that: A plurality of electric telescopic rods (3) are symmetrically mounted on both sides of the box (1), and the electric telescopic rods (3) are electrically connected to the controller (2). A push rod (4) is mounted on the output end of the electric telescopic rod (3), and a pressure sensor (5) is mounted on one end of the push rod (4). The pressure sensor (5) is electrically connected to the controller (2), and the pressure sensor (5) is located inside the box (1). A pressure plate (6) is mounted on the input end of the pressure sensor (5).

3. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 1, characterized in that: The front of the box body (1) is symmetrically mounted with a plurality of electric telescopic rods (7), the electric telescopic rods (7) are electrically connected to the controller (2), the output end of the electric telescopic rods (7) is mounted with a push rod (8), one end of the push rod (8) is mounted with a pressure sensor (9), and the pressure sensor (9) is electrically connected to the controller (2), and the pressure sensor (9) is located inside the box body (1), the input end of the pressure sensor (9) is mounted with a pressure frame (10), and the pressure frame (10) is located inside the pressure plate (6), a spring (11) is installed through one side of the pressure frame (10), one end of the spring (11) is mounted with a pressure plate (12), and the pressure plate (12) is located inside the pressure frame (10).

4. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 1, characterized in that: The mobile drilling mechanism comprises a guide rod (17), a movable plate (18), a hydraulic cylinder (19), a lifting plate (20), a motor (21) and a drill rod (22), wherein the guide rod (17) is mounted on the top of the rotating plate (16), the movable plate (18) is movably mounted on the outer side of the guide rod (17), the front of the movable plate (18) is mounted with a hydraulic cylinder (19), and the hydraulic cylinder (19) is electrically connected to the controller (2), the output end of the hydraulic cylinder (19) is mounted with the lifting plate (20), the bottom of the lifting plate (20) is mounted with a motor (21), and the motor (21) is electrically connected to the controller (2), the output end of the motor (21) is mounted with the drill rod (22), and the drill rod (22) is located above the pipe (23).

5. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 1, characterized in that: A right-angle plate 1 (24) is installed on one side of the rotating plate (16), a hydraulic cylinder 2 (25) is installed on one side of the right-angle plate 1 (24), the hydraulic cylinder 2 (25) is electrically connected to the controller (2), a moving plate 2 (26) is installed on the output end of the hydraulic cylinder 2 (25), an electric telescopic rod 3 (27) is installed on one side of the moving plate 2 (26), and the electric telescopic rod 3 (27) is electrically connected to the controller (2).

6. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 5, characterized in that: The output end of the electric telescopic rod 3 (27) is installed with a closing plate (28), the bottom of the closing plate (28) is installed with a rubber pad (38), and the top of the closing plate (28) is penetrated and installed with a pipe 2 (29).

7. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 6, characterized in that: A right-angle plate 2 (30) is symmetrically mounted on the top of the closing plate (28), a motor 2 (31) is mounted on the top of the right-angle plate 2 (30), and the motor 2 (31) is electrically connected to the controller (2), a screw rod (32) is mounted on the output end of the motor 2 (31), one end of the screw rod (32) passes through the top of the closing plate (28), a lifting block (33) is mounted on the outside of the screw rod (32), a pressure sensor 3 (34) is mounted on the bottom of the lifting block (33), and the pressure sensor 3 (34) is electrically connected to the controller (2), and a detection rod (35) is mounted on the bottom input end of the pressure sensor 3 (34).

8. The shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 6, characterized in that: A hydraulic pump (36) is installed on the top of the rotating plate (16), and the hydraulic pump (36) is electrically connected to the controller (2). A hose (37) is installed at the output end of the hydraulic pump (36), and the output end of the hose (37) is connected to the input end of the second pipe (29).

9. A method for using a shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to any one of claims 1 to 8, characterized in that: The method for using the shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction is as follows: S1. Place the rock into the box (1), then the first pressing plate (6) moves inward to limit and squeeze the two sides of the rock, and the pressing frame (10) and the second pressing plate (12) squeeze and limit the front of the rock; S2, the rotating plate (16) is then rotated to an appropriate position, and then the drill rod (22) is moved downward to extend into the pipe one (23) and continues to move downward to drill the rock inside the box (1), and drills the rocks below the multiple pipes one (23) respectively; S3, by moving the closing plate (28) to the top of the pipe (23), then the closing plate (28) moves downward, and then the detection rod (35) moves downward to extend into the interior of the pipe (23) on both sides and continues to move downward to extend into the bottom of the hole in the rock; S4. The hydraulic pump (36) sucks the external water into the second pipe (29), and then the water enters the first pipe (23) and enters the pores of the rock to perform a hydraulic fracturing experiment on the rock.

10. The method for using the shale multi-stage combined pressure-drive integrated simulation device for shale gas extraction according to claim 9, characterized in that: The step S2 also includes the following steps: S21. When the drill rod (22) encounters a rock portion with high hardness and cannot be moved downward, the drill rod (22) moves upward and then continues to rotate the rotating plate (16) so that the drill rod (22) can drill rocks in other directions.

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