Device for simulating volume fracturing of shale reservoir

Abstract

The invention discloses a device for simulating volume fracturing of a shale reservoir. The device comprises a simulated reservoir cavity, a turnover adjusting mechanism and a pressurized liquid filling mechanism, the simulation reservoir cavity is used for carrying out a volume fracturing simulation experiment; the overturning adjusting mechanism is arranged below the simulated reservoir cavity and is used for adjusting the inclination angle between the simulated reservoir cavity and the horizontal plane; and the pressurizing and liquid filling mechanism is connected with the simulation reservoir cavity and the turnover adjusting mechanism through pipelines, and is used for providing pressure during a simulation experiment and also providing drive for the turnover adjusting mechanism. The device provided by the invention solves the technical problem that fracturing simulation of any dip angle stratums is difficult to simulate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fracturing simulation devices, and relates to a device for shale reservoir volume fracturing simulation. BACKGROUND

[0002] Shale reservoir volume fracturing is a technology for improving shale oil mining efficiency. Since shale reservoirs have the characteristics of low porosity and low permeability, traditional mining methods cannot effectively mine shale oil. Therefore, through volume fracturing technology, a complex fracture network can be formed in the shale reservoir, thereby increasing the permeability of the reservoir and improving the mining efficiency of shale oil. The horizontal wellbore is a commonly used wellbore type in volume fracturing technology. In order to study shale reservoir volume fracturing, shale reservoir volume fracturing simulation experiments are often conducted.

[0003] At present, shale reservoir volume fracturing simulation experiments generally use a formation simulation device, in which a plurality of pressure sensors are uniformly arranged, and a horizontal wellbore is arranged therein. The fracturing is carried out by filling liquid, the pressure sensors sense and feedback the pressure conditions at each position, and the simulation is realized. The traditional formation simulation device lacks an inclination adjusting device, and cannot automatically adjust the angle between the simulated formation and the horizontal plane. It is not easy to simulate the formation with an arbitrary inclination, which is not conducive to the fracturing research of different inclination formations. SUMMARY

[0004] The purpose of the present application is to provide a device for shale reservoir volume fracturing simulation, which solves the technical problem of not being easy to simulate the fracturing simulation of an arbitrary inclination formation.

[0005] The technical solution adopted by the present application is a device for shale reservoir volume fracturing simulation, comprising a simulated reservoir cavity, a turnover adjusting mechanism and a pressurized liquid filling mechanism. The simulated reservoir cavity is used for volume fracturing simulation experiments. The turnover adjusting mechanism is arranged below the simulated reservoir cavity and is used for adjusting the inclination angle between the simulated reservoir cavity and the horizontal plane. The pressurized liquid filling mechanism is connected to the simulated reservoir cavity and the turnover adjusting mechanism through a pipeline and is used for providing pressure during the simulation experiment and driving the turnover adjusting mechanism.

[0006] The present application has the following characteristics:

[0007] The simulated reservoir cavity comprises a box body and a cover arranged at the opening of the top of the box body. The box body is internally provided with a simulation medium, and a plurality of pressure sensors are uniformly arranged in the box body. The horizontal wellbore penetrates the side wall of the box body and is inserted into the simulation medium. A plurality of uniformly distributed perforation holes are arranged on the horizontal wellbore.

[0008] The pressurized liquid filling mechanism comprises a liquid storage tank, a delivery pipe is arranged on the side wall of the liquid storage tank, the other end of the delivery pipe is connected to the liquid inlet end of the plunger pump, the liquid outlet end of the plunger pump is connected with a three-way pipe, the other two ends of the three-way pipe are respectively connected with a first hose and a second hose, the other end of the first hose is connected to the turnover adjusting mechanism, and the other end of the second hose is connected with one end of the horizontal wellbore located outside the simulated reservoir cavity.

[0009] Valves are arranged at the connection positions of the first hose, the second hose and the three-way pipe, a pressure gauge and a flow meter are arranged on the second hose, a second support seat is fixedly arranged below the liquid storage tank, an agitator is arranged on the bottom of the liquid storage tank, and a temperature sensor and an electric heating plate are arranged on the inner wall of the liquid storage tank.

[0010] The turnover adjusting mechanism comprises a first support seat, a carrier plate is fixedly arranged on the first support seat, one end of the carrier plate is connected with a movable plate through a first hinged frame, an extension block is arranged at one end of the movable plate, and the extension block is hingedly connected with the first hinged frame; the top of the movable plate is fixedly connected with the bottom of a box body in the simulated reservoir cavity; a telescopic rod is arranged between the carrier plate and the movable plate, and two ends of the telescopic rod are fixedly connected with the carrier plate and the movable plate through a second hinged frame and a third hinged frame.

[0011] The telescopic rod comprises a connecting cylinder connected with the second hinged frame, a straight cylinder is fixedly connected to the other end of the connecting cylinder, a movable column is connected to the other end of the straight cylinder in a clearance fit mode, and the other end of the movable column is connected to the third hinged frame; a guide groove is formed in the surface of the movable column along the length direction, a guide strip is connected to the guide groove in a clearance fit mode, and the guide strip is fixedly connected with the inner wall of the straight cylinder; a screw hole is formed in the movable column along the length direction, a screw rod is threadedly connected to the screw hole, the other end of the screw rod is connected with a driving assembly, and the driving assembly is arranged in the connecting cylinder.

[0012] The driving assembly comprises an inner plate arranged in the radial direction of the connecting cylinder, the inner plate divides the inner part of the connecting cylinder into two chambers, i.e., a first chamber close to the second hinged frame and a second chamber close to the straight cylinder, a plurality of through holes are formed in the inner plate, and the two chambers are communicated through the through holes; a first rotating shaft is arranged in the center of the connecting cylinder in the axial direction, one end of the first rotating shaft is rotatably connected with the side surface of the connecting cylinder, the other end of the first rotating shaft passes through the inner plate and is connected with one end of the screw rod through a transmission component; an impeller is arranged in the first chamber of the connecting cylinder, the impeller is fixedly arranged on the first rotating shaft, a liquid inlet port is arranged on the side wall of the first chamber in a communication mode, a liquid outlet port is arranged on the side wall of the second chamber in a communication mode, a one-way valve is arranged on each of the liquid inlet port and the liquid outlet port, the one-way valve arranged on the liquid inlet port is connected with one end of the first hose, the one-way valve arranged on the liquid outlet port is connected with one end of a liquid return hose, and the other end of the liquid return hose is connected to the bottom of the liquid storage tank.

[0013] The transmission component comprises a protection box and an upper cover body fixedly installed on the top of the protection box, the upper cover body is fixedly installed on the inner wall of the end of the connecting barrel body, a worm is rotatably installed in the protection box, one end of the worm is fixedly connected with one end of a first rotating shaft, the worm is meshingly connected with a worm wheel, one electric telescopic plug-in part is fixedly installed on the middle of each side of the worm wheel, an inner frame is fixedly installed in the protection box, the electric telescopic plug-in part is rotatably installed with the inner frame, one gear part is arranged on the end of each electric telescopic plug-in part away from the worm wheel, the two gear parts are symmetrically arranged about the worm wheel, the two gear parts extend into the inside of the upper cover body, and a synchronous belt is arranged between the two gear parts, the inner belt surface of the synchronous belt is meshingly connected with a second synchronous wheel, the second synchronous wheel is fixedly installed on a fourth rotating shaft, the fourth rotating shaft is rotatably installed with the upper cover body, and the top end of the fourth rotating shaft is fixedly connected with the bottom end of a screw rod.

[0014] The electric telescopic plug-in part comprises a rotating tube fixedly connected with the middle of the worm wheel, the rotating tube passes through the inner frame and is rotatably installed with the inner frame, an electromagnet is fixedly installed on the inside of the end of the rotating tube close to the worm wheel, an iron column is arranged on the other end of the electromagnet, a plug rod is fixedly connected with the other end of the iron column, the plug rod is gap-fit connected with the guide hole at one end of the rotating tube, the plug rod passes out of the rotating tube from the guide hole, a spring is sleeved on the plug rod, and the two ends of the spring are fixedly connected with the inner wall of the rotating tube and the iron column respectively.

[0015] The gear part comprises a second rotating shaft, a first conical gear, a second conical gear, a third rotating shaft and a first synchronous wheel, the second rotating shaft is perpendicularly rotatably installed with the side wall of the protection box, one end of the second rotating shaft facing the electric telescopic plug-in part is provided with a plug hole, the plug hole is matched with the plug rod in the electric telescopic plug-in part, the first conical gear is fixedly sleeved on the second rotating shaft, the first conical gear is meshingly connected with the second conical gear, the middle of the second conical gear is fixedly connected with one end of the third rotating shaft, the third rotating shaft passes through the protection box and extends into the inside of the upper cover body, the third rotating shaft is rotatably connected with the protection box, the first synchronous wheel is fixedly sleeved on one end of the third rotating shaft in the inside of the upper cover body, a synchronous belt is arranged between the two first synchronous wheels, and the first synchronous wheel is meshingly connected with the inner surface of the synchronous belt.

[0016] The beneficial effects of the present application are:

[0017] (1) The device structure is reasonable, the device for shale reservoir volume fracturing simulation is provided, the inclination angle between the upper simulation reservoir cavity and the horizontal plane can be adjusted through the design of the overturning adjusting mechanism, and then the fracturing research of an arbitrary inclination angle stratum is simulated, and convenience is provided for the overall fracturing research.

[0018] (2) The device is convenient to operate, the design that the overturning adjusting mechanism is connected with the pressurizing and liquid filling mechanism, the pressurizing and liquid filling mechanism can provide driving for the overturning adjusting mechanism in addition to the simulated fracturing pressure, and a power source does not need to be additionally arranged, and convenience is provided for the overall use. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the simulated reservoir cavity in the device of the present invention;

[0021] Figure 3 This is a schematic diagram of the pressurized liquid filling mechanism in the device of the present invention;

[0022] Figure 4 This is a front view of the simulated reservoir cavity and the flipping adjustment mechanism in the device of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the connecting cylinder and the inside of the straight cylinder in the device of the present invention;

[0024] Figure 6 This is a top view of the impeller and the liquid inlet port in the device of the present invention;

[0025] Figure 7 This is a schematic diagram of the transmission component in the device of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the electrically telescopic plug in the device of the present invention;

[0027] Figure 9 for Figure 7 Enlarged structural diagram of section A in the middle.

[0028] In the diagram, 1. First support base, 2. Carrier plate, 3. Movable plate, 301. Extension block, 4. First hinge frame, 5. Second hinge frame, 6. Connecting cylinder, 7. Straight cylinder, 8. Box body, 9. Cover, 10. Screw, 11. Second support base, 12. Storage tank, 1201. Agitator, 1202. Temperature sensor, 1203. Electric heating plate, 13. Delivery pipe, 14. Plunger pump, 15. T-connector, 16. Valve, 17. First hose, 18. Second hose, 19. Pressure gauge, 20. Flow meter, 21. Return hose, 22. Horizontal wellbore, 23. Third hinge frame, 24. Movable column, 25. Inlet port, 26. 27. Liquid outlet port, 28. One-way valve, 29. Impeller, 30. First rotating shaft, 31. Inner plate, 32. Through hole, 33. Protective box, 34. Perforation hole, 35. Guide bar, 36. Screw, 37. Worm gear, 38. Inner frame, 39. Rotating tube, 40. Worm gear, 41. Second rotating shaft, 42. First bevel gear, 43. Insertion hole, 44. Second bevel gear, 45. Third rotating shaft, 46. First synchronous pulley, 47. Synchronous belt, 48. Second synchronous pulley, 49. Upper cover, 50. Fourth rotating shaft, 51. Insert rod, 52. Electromagnet, 53. Iron column, 54. Spring, 55. Guide hole, 56. Simulated medium, 57. Pressure sensor. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] The device for simulating volumetric fracturing in shale reservoirs according to the present invention has the following structure: Figure 1 As shown, the system includes a simulated reservoir cavity, a tilting adjustment mechanism, and a pressurized filling mechanism. The simulated reservoir cavity is used for volumetric fracturing simulation experiments. The tilting adjustment mechanism is located below the simulated reservoir cavity and is used to adjust the tilt angle between the simulated reservoir cavity and the horizontal plane. The pressurized filling mechanism is connected to the simulated reservoir cavity and the tilting adjustment mechanism via pipelines, providing pressure during the simulation experiment and also driving the tilting adjustment mechanism. Figure 2 As shown, the simulated reservoir cavity includes a box body 8 and a cover body 9 set at the top opening of the box body 8. The box body 8 is filled with a simulated medium 55, and a number of pressure sensors 56 are evenly arranged inside the box body 8. The horizontal wellbore 22 passes through the side wall of the box body 8 and is inserted into the simulated medium 55. A number of evenly distributed perforation holes 33 are provided on the horizontal wellbore 22.

[0032] Example 2

[0033] Based on Example 1, such as Figure 3 As shown, the pressurized filling mechanism includes a storage tank 12, a delivery pipe 13 is provided on the side wall of the storage tank 12, the other end of the delivery pipe 13 is connected to the inlet end of the plunger pump 14, the outlet end of the plunger pump 14 is connected to a three-way pipe 15, the other two ends of the three-way pipe 15 are respectively connected to a first hose 17 and a second hose 18, the other end of the first hose 17 is connected to a tilting adjustment mechanism, and the other end of the second hose 18 is connected to the end of the horizontal wellbore 22 located outside the simulated reservoir cavity.

[0034] Example 3

[0035] The device for simulating volumetric fracturing in shale reservoirs according to the present invention has the following structure: Figure 1 As shown, it includes a simulated reservoir cavity, a tilting adjustment mechanism, and a pressurized filling mechanism; the simulated reservoir cavity is used for volumetric fracturing simulation experiments; the tilting adjustment mechanism is located below the simulated reservoir cavity and is used to adjust the tilt angle between the simulated reservoir cavity and the horizontal plane; the pressurized filling mechanism is connected to the simulated reservoir cavity and the tilting adjustment mechanism through pipelines, and is used to provide pressure during the simulation experiment and also to drive the tilting adjustment mechanism.

[0036] like Figure 1 and Figure 2As shown, the simulated reservoir cavity includes a box body 8 and a cover 9 located at the top opening of the box body 8. The cover 9 is connected to the box body 8 by screws 10. The box body 8 contains a simulated medium 55, and several pressure sensors 56 are evenly distributed inside the box body 8. A horizontal wellbore 22 passes through the side wall of the box body 8 and inserts the simulated medium 55. Several evenly distributed perforation holes 33 are provided on the horizontal wellbore 22.

[0037] like Figure 1 and Figure 3 As shown, the pressurized filling mechanism includes a storage tank 12, with a second support base 11 fixedly installed below the storage tank 12. A stirrer 1201 is installed at the bottom of the storage tank 12, and a temperature sensor 1202 and an electric heating plate 1203 are installed on the inner wall of the storage tank 12. A delivery pipe 13 is provided on the side wall of the storage tank 12. The other end of the delivery pipe 13 is connected to the inlet end of the plunger pump 14, and the outlet end of the plunger pump 14 is connected to a three-way pipe 15. The other two ends of the three-way pipe 15 are respectively connected to a first hose 17 and a second hose 18. The other end of the first hose 17 is connected to a tilting adjustment mechanism, and the other end of the second hose 18 is connected to the end of the horizontal wellbore 22 located outside the simulated reservoir cavity. Valves 16 are provided at the connection points of the first hose 17 and the second hose 18 with the three-way pipe 15. A pressure gauge 19 and a flow meter 20 are installed on the second hose 18. Liquid in storage tank 12 enters the simulated reservoir cavity and tilting adjustment mechanism through delivery pipe 13, first hose 17, and second hose 18. This provides the simulated reservoir cavity with the liquid required for fracturing experiments and powers the tilting adjustment mechanism to adjust the tilt angle between the simulated reservoir cavity and the horizontal plane. Flow meter 20 and pressure gauge 19 control the flow rate and pressure of the liquid entering the simulated reservoir cavity.

[0038] like Figure 1 and Figure 4 As shown, the flipping adjustment mechanism includes a first support base 1, on which a carrier plate 2 is fixedly installed. One end of the carrier plate 2 is connected to a movable plate 3 via a first hinge frame 4. One end of the movable plate 3 is provided with an extension block 301, which is hinged to the first hinge frame 4. The top of the movable plate 3 is fixedly connected to the bottom of the box 8 in the simulated reservoir cavity.

[0039] A telescopic rod is provided between the carrier plate 2 and the movable plate 3, with its two ends fixed to the carrier plate 2 and the movable plate 3 respectively through the second hinge frame 5 and the third hinge frame 23. When the telescopic rod extends, the movable plate 3 will tilt, thereby tilting the simulated reservoir cavity, which can adjust the tilt angle between the simulated reservoir cavity and the horizontal plane.

[0040] The telescopic rod includes a connecting cylinder 6 connected to the second hinge frame 5, a straight cylinder 7 fixed to the other end of the connecting cylinder 6, a movable column 24 with clearance fit to the other end of the straight cylinder 7, and the other end of the movable column 24 connected to the third hinge frame 23.

[0041] like Figure 5 and Figure 6 As shown, a guide groove is formed on the surface of the movable column 24 along its length. A guide strip 34 is connected to the guide groove with a clearance fit. The guide strip 34 is fixed to the inner wall of the straight cylinder 7 and is used to guide the movable column 24 during its left and right movement. A screw hole is formed inside the movable column 24 along its length. A screw rod 35 is threadedly connected to the screw hole. The other end of the screw rod 35 is connected to a drive assembly, which is located inside the connecting cylinder 6.

[0042] The drive assembly includes an inner plate 30 arranged radially along the connecting cylinder 6. The inner plate 30 divides the interior of the connecting cylinder 6 into two chambers: a first chamber near the second hinge frame 5 and a second chamber near the straight cylinder 7. The inner plate 30 has multiple through holes 31, through which the two chambers are connected. A first rotating shaft 29 is axially arranged at the center of the connecting cylinder 6. One end of the first rotating shaft 29 is rotatably connected to the side of the connecting cylinder 6, and the other end passes through the inner plate 30 and is connected to one end of the screw 35 through a transmission component. An impeller 28 is installed in the first chamber of the connecting cylinder 6. The impeller 28 is fixedly installed on the first rotating shaft 29. An inlet port 25 is connected to the side wall of the first chamber, and an outlet port 26 is connected to the side wall of the second chamber. A one-way valve 27 is installed on both the inlet port 25 and the outlet port 26. The one-way valve 27 on the inlet port 25 is connected to one end of the first hose 17, and the one-way valve 27 on the outlet port 26 is connected to one end of the return hose 21. The other end of the return hose 21 is connected to the bottom of the storage tank 12.

[0043] like Figure 7 As shown, the transmission component includes a protective box 32 and an upper cover 48 fixedly installed on the top of the protective box 32. The upper cover 48 is fixedly installed on the inner wall of the end of the connecting cylinder 6. A worm gear 36 is rotatably installed inside the protective box 32, and one end of the worm gear 36 is fixedly connected to one end of the first rotating shaft 29. The worm gear 36 is meshed with a worm wheel 39. An electric telescopic plug is fixedly installed on the middle of both sides of the worm wheel 39. An inner frame 37 is fixedly installed inside the protective box 32. The electric telescopic plug is rotatably installed with the inner frame 37, and the inner frame 37 serves to support the electric telescopic plug. Each of the two electric telescopic inserts has a gear component at the end furthest from the worm gear 39. The two gear components are symmetrically arranged about the worm gear 39 and extend into the interior of the upper cover 48. A timing belt 46 is provided between the two gear components. The inner surface of the timing belt 46 is meshed with a second timing pulley 47. The second timing pulley 47 is fixedly mounted on the fourth rotating shaft 49. The fourth rotating shaft 49 is rotatably mounted to the upper cover 48, and the top end of the fourth rotating shaft 49 is fixedly connected to the bottom end of the screw 35.

[0044] like Figure 7 and Figure 8As shown, the electric telescopic plug includes a rotating tube 38 fixedly connected to the middle of the worm gear 39. The rotating tube 38 passes through the inner frame 37 and is rotatably installed with the inner frame 37. An electromagnet 51 is fixedly installed inside the rotating tube 38 near the worm gear 39. An iron column 52 is placed at the other end of the electromagnet 51. An insertion rod 50 is fixedly connected to the other end of the iron column 52. The insertion rod 50 is connected to the guide hole 54 at one end of the rotating tube 38 with clearance fit. The insertion rod 50 passes through the guide hole 54 and exits the rotating tube 38. A spring 53 is sleeved on the insertion rod 50. The two ends of the spring 53 are fixedly connected to the iron column 52 and the inner wall of the rotating tube 38, respectively.

[0045] like Figure 7 and Figure 9 As shown, the gear assembly includes a second rotating shaft 40, a first bevel gear 41, a second bevel gear 43, a third rotating shaft 44, and a first synchronous pulley 45. The second rotating shaft 40 is rotatably mounted perpendicularly to the side wall of the protective box 32, and the end of the second rotating shaft 40 facing the electric telescopic plug has an insertion hole 42, which is adapted to the plug rod 50 in the electric telescopic plug. The first bevel gear 41 is fixedly sleeved on the second rotating shaft 40, and the first bevel gear 41 is meshed with the second bevel gear 43. The middle part of the second bevel gear 43 is fixedly connected to one end of the third rotating shaft 44. The third rotating shaft 44 extends through the protective box 32 into the interior of the upper cover 48, and the third rotating shaft 44 is rotatably connected to the protective box 32. The end of the third rotating shaft 44 located inside the upper cover 48 is fixedly sleeved with the first synchronous pulley 45. A synchronous belt 46 is provided between the two first synchronous pulleys 45, and the inner surfaces of the first synchronous pulleys 45 and the synchronous belt 46 are meshed.

[0046] The working principle of the flipping adjustment mechanism in the device of this invention is as follows:

[0047] Open valve 16 connected to the first hose 17. Driven by plunger pump 14, liquid in storage tank 12 enters the first chamber of connecting cylinder 6 through the first hose 17, check valve 27, and inlet port 25. Then, it enters the second chamber from the first chamber through through hole 31, and then flows back to storage tank 12 through outlet port 26, check valve 27, and return hose 21. After entering the first chamber, the liquid drives impeller 28 to rotate. Impeller 28 drives first shaft 29 to rotate, which in turn drives worm gear 36 to rotate. Through the meshing transmission between worm gear 36 and worm wheel 39, the electric telescopic plug is driven to rotate until the end of plug rod 50 is aligned with plug hole 42. Through the elastic force of spring 53, plug rod 50 is inserted into plug hole 42, thereby realizing the connection between gear component and electric telescopic plug. The rotation of the electric telescopic plug drives the second rotating shaft 40 to rotate, and then drives the third rotating shaft 44 to rotate through the meshing transmission between the first bevel gear 41 and the second bevel gear 43. This in turn drives the first synchronous pulley 45, the synchronous belt 46, the second synchronous pulley 47 and the fourth rotating shaft 49 to rotate, causing the screw 35 to rotate, which in turn causes the movable column 24 to rotate, thus adjusting the inclination angle between the simulated reservoir cavity and the horizontal plane.

[0048] To disconnect one of the electrically operated telescopic inserts from the gear assembly, the electromagnet 51 in the insert is energized, magnetically attracting the end of the iron column 52. Simultaneously, the spring 53 is stretched, separating the insert rod 50 from the insertion hole 42, thus disconnecting the electrically operated telescopic insert from the gear assembly. When the power is off, the iron column 52 loses its magnetic attraction. Driven by the spring force of the spring 53, the iron column 52 and the insert rod 50 move, pressing the end of the insert rod 50 against the insertion hole 42 at the end of the second shaft 40 of the gear assembly, thus connecting the electrically operated telescopic insert to the gear assembly. The design of two electric telescopic plugs allows for selective connection of the two gear components. Due to the symmetrical arrangement of the two gear components, the first rotating shaft 29 is driven by liquid flow to rotate in one direction. After selective connection, the third rotating shaft 44 of the two gear components can rotate in opposite directions, driving the screw 35 to rotate in two directions. Through threaded transmission with the screw hole on the movable column 24, and with the guidance of the guide bar 34 and the guide groove, the movable column 24 can slide along the length of the straight cylinder 7 to adjust the overall length and realize the telescopic adjustment of the telescopic rod. During the telescopic extension and retraction of the telescopic rod, pushing the movable plate 3 can adjust the angle between the simulated reservoir cavity and the horizontal plane.

Claims

1. An apparatus for shale reservoir volume fracturing simulation, characterized in that, The simulation reservoir cavity is used for volume fracturing simulation experiment; the turnover adjusting mechanism is arranged below the simulation reservoir cavity and is used for adjusting the inclination angle between the simulation reservoir cavity and the horizontal plane; and the pressurized liquid filling mechanism is connected with the simulation reservoir cavity and the turnover adjusting mechanism through the pipeline and is used for providing pressure during the simulation experiment and providing driving for the turnover adjusting mechanism.

2. The apparatus for shale reservoir volume fracturing simulation of claim 1, wherein, The simulation reservoir cavity includes a box body (8) and a cover body (9) arranged at the top opening of the box body (8), the inside of the box body (8) is provided with a simulation medium (55), and the inside of the box body (8) is uniformly provided with a plurality of pressure sensors (56); a horizontal wellbore (22) is inserted into the simulation medium (55) through the side wall of the box body (8), and the horizontal wellbore (22) is provided with a plurality of uniformly distributed perforation holes (33).

3. The apparatus for shale reservoir volume fracturing simulation of claim 2, wherein, The pressurized liquid filling mechanism includes a liquid storage tank (12), the side wall of the liquid storage tank (12) is provided with a delivery pipe (13), the other end of the delivery pipe (13) is connected to the liquid inlet end of a plunger pump (14), the liquid outlet end of the plunger pump (14) is connected with a three-way pipe (15), the other two ends of the three-way pipe (15) are respectively connected with a first hose (17) and a second hose (18), the other end of the first hose (17) is connected to the turnover adjusting mechanism, and the other end of the second hose (18) is connected with one end of the horizontal wellbore (22) located outside the simulation reservoir cavity.

4. The apparatus for shale reservoir volume fracturing simulation of claim 3, wherein, Valves (16) are arranged at the connection positions of the first hose (17), the second hose (18) and the three-way pipe (15), a pressure gauge (19) and a flowmeter (20) are mounted on the second hose (18), a second support seat (11) is fixedly mounted below the liquid storage tank (12), a stirrer (1201) is arranged at the bottom of the liquid storage tank (12), and a temperature sensor (1202) and an electric heating plate (1203) are mounted on the inner wall of the liquid storage tank (12).

5. The apparatus for shale reservoir volume fracturing simulation of claim 3, wherein, The turnover adjusting mechanism includes a first support seat (1), a carrier plate (2) is fixedly mounted on the first support seat (1), one end of the carrier plate (2) is connected with a movable plate (3) through a first hinge frame (4), one end of the movable plate (3) is provided with an extension block (301), the extension block (301) is hingedly mounted with the first hinge frame (4); the top of the movable plate (3) is fixedly connected with the bottom of the box body (8) in the simulation reservoir cavity; a telescopic rod is arranged between the carrier plate (2) and the movable plate (3), and both ends of the telescopic rod are fixedly connected with the carrier plate (2) and the movable plate (3) through a second hinge frame (5) and a third hinge frame (23).

6. The apparatus for shale reservoir volume fracturing simulation of claim 5, wherein, The telescopic rod comprises a connecting cylinder (6) connected with the second articulated frame (5), a straight cylinder (7) fixed at the other end of the connecting cylinder (6), a movable column (24) connected with the other end of the straight cylinder (7) in a clearance fit, and a third articulated frame (23) connected with the other end of the movable column (24); a guide groove is formed on the surface of the movable column (24) along the length direction, a guide strip (34) is connected with the guide groove in a clearance fit, and the guide strip (34) is fixed with the inner wall of the straight cylinder (7); a screw hole is formed in the movable column (24) along the length direction, a screw rod (35) is screwed into the screw hole, the other end of the screw rod (35) is connected with a driving assembly, and the driving assembly is arranged in the connecting cylinder (6).

7. The apparatus for shale reservoir volume fracturing simulation of claim 6, wherein, The driving assembly comprises an inner plate (30) arranged radially in the connecting cylinder (6), the inner plate (30) divides the inner part of the connecting cylinder (6) into two chambers, i.e., a first chamber close to the second articulated frame (5) and a second chamber close to the straight cylinder (7), a plurality of through holes (31) are formed in the inner plate (30), and the two chambers are communicated through the through holes (31); a first rotating shaft (29) is arranged in the center of the connecting cylinder (6) along the axial direction, one end of the first rotating shaft (29) is rotatably connected with the side surface of the connecting cylinder (6), the other end of the first rotating shaft (29) penetrates through the inner plate (30) and is connected with one end of the screw rod (35) through a transmission member; an impeller (28) is arranged in the first chamber of the connecting cylinder (6), the impeller (28) is fixedly installed on the first rotating shaft (29), a liquid inlet port (25) is arranged on the side wall of the first chamber in communication, a liquid outlet port (26) is arranged on the side wall of the second chamber in communication, a one-way valve (27) is installed on the liquid inlet port (25) and the liquid outlet port (26), the one-way valve (27) located on the liquid inlet port (25) is connected with one end of the first hose (17), the one-way valve (27) located on the liquid outlet port (26) is connected with one end of a liquid return hose (21), and the other end of the liquid return hose (21) is connected with the bottom of the liquid storage tank (12).

8. The apparatus for shale reservoir volume fracturing simulation of claim 7, wherein, The transmission component comprises a protection box (32) and an upper cover (48) fixedly installed on the top of the protection box (32) and fixedly installed on the inner wall of the end of the connecting barrel (6); a worm (36) is rotatably installed in the protection box (32), one end of the worm (36) is fixedly connected with one end of a first rotating shaft (29), the worm (36) is meshingly connected with a worm wheel (39), one electric telescopic plug-in part is fixedly installed on the middle of each side of the worm wheel (39), an inner frame (37) is fixedly installed in the protection box (32), and the electric telescopic plug-in part is rotatably installed with the inner frame (37); one gear part is arranged at the end of each electric telescopic plug-in part away from the worm wheel (39), the two gear parts are symmetrically arranged about the worm wheel (39), the two gear parts extend into the upper cover (48), and a synchronous belt (46) is arranged between the two gear parts, the inner belt surface of the synchronous belt (46) is meshingly connected with a second synchronous wheel (47), the second synchronous wheel (47) is fixedly installed on a fourth rotating shaft (49), the fourth rotating shaft (49) is rotatably installed with the upper cover (48), and the top end of the fourth rotating shaft (49) is fixedly connected with the bottom end of a screw rod (35).

9. The apparatus for shale reservoir volume fracturing simulation of claim 8, wherein, The electric telescopic plug-in part comprises a rotating tube (38) fixedly connected with the middle of the worm wheel (39), the rotating tube (38) penetrates through the inner frame (37) and is rotatably installed with the inner frame (37), an electromagnet (51) is fixedly installed on the inner wall of one end of the rotating tube (38) close to the worm wheel (39), an iron column (52) is arranged at the other end of the electromagnet (51), an insertion rod (50) is fixedly connected with the other end of the iron column (52), the insertion rod (50) is gap-fit connected with a guide hole (54) at one end of the rotating tube (38), the insertion rod (50) penetrates out of the rotating tube (38) from the guide hole (54), a spring (53) is sleeved on the insertion rod (50), and the two ends of the spring (53) are fixedly connected with the inner wall of the rotating tube (38) and the iron column (52) respectively.

10. The apparatus for shale reservoir volume fracturing simulation of claim 9, wherein, The gear part comprises a second rotating shaft (40), a first conical gear (41), a second conical gear (43), a third rotating shaft (44) and a first synchronous wheel (45); the second rotating shaft (40) is perpendicularly rotatably installed with the side wall of the protection box (32), one end of the second rotating shaft (40) facing the electric telescopic plug-in part is provided with an insertion hole (42), the insertion hole (42) is matched with the insertion rod (50) in the electric telescopic plug-in part, the first conical gear (41) is fixedly sleeved on the second rotating shaft (40), the first conical gear (41) is meshingly connected with the second conical gear (43), the middle of the second conical gear (43) is fixedly connected with one end of the third rotating shaft (44), the third rotating shaft (44) penetrates through the protection box (32) and extends into the upper cover (48), the third rotating shaft (44) is rotatably connected with the protection box (32), a first synchronous wheel (45) is fixedly sleeved on one end of the third rotating shaft (44) in the upper cover (48), a synchronous belt (46) is arranged between the two first synchronous wheels (45), and the first synchronous wheel (45) is meshingly connected with the inner surface of the synchronous belt (46).

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