Sand adding device for geothermal well fracturing operation

Abstract

The invention discloses a sand adding device for geothermal well fracturing operation, and particularly relates to the technical field of fracturing sand adding, the sand adding device comprises a sand adding pipe, an electric cylinder, a pressure sensor and a two-way synchronous constant force sealing sand adding assembly; wherein the bidirectional synchronous anchoring force sealing sand adding assembly comprises a pressing block, a linkage groove ring, a plurality of hinge shafts, a sleeving rod, a linkage shaft, a concave block, a transverse pressing plate and a rubber ring. The bidirectional synchronous constant-force sealing sand adding assembly has the advantages that transverse and vertical synchronous constant-force sealing can be achieved for a gap at the joint of a sand adding pipe and a geothermal well, and the sand adding sealing performance of the geothermal well is greatly improved, so that the problem that the sand adding pipe and the edge of the geothermal well have the gap, and the sand adding sealing performance is poor is solved. The problems that sand-carrying fluid is easily jetted and overflows upwards along the outer wall of the sand adding pipeline, transverse and vertical synchronous constant force sealing of a gap at the connecting position of the sand adding pipeline and the geothermal well is difficult to achieve, and the sand adding sealing performance of the geothermal well is extremely poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing sand adding, and more specifically, to a sand adding device for geothermal well fracturing operation. Background Art

[0002] The principle of the sand-adding device for geothermal well fracturing operation is to use the ground high-pressure pump group to inject high-viscosity fracturing fluid into the well, and build up high pressure at the bottom of the well. When the pressure overcomes the ground stress near the well wall and reaches the tensile strength of the formation, cracks will be generated at the bottom of the well, and then the sand-carrying fluid will be injected. The sand-carrying fluid with proppant will continue to be injected into the cracks, and the cracks will continue to extend and be filled with proppant.

[0003] In the existing public documents, the patent publication number CN101619654A discloses a horizontal well pulse fracturing sand adding device, which introduces proppant into the high-energy gas fracturing process, improves the stability of the cracks, prolongs the production increase time, and has the characteristics of low cost, obvious production increase effect, simple process, safe and reliable use. It is suitable for horizontal wells, vertical wells or inclined wells with different completion methods, such as cased wells, screen wells or open hole wells, but the technology has the following defects.

[0004] When fracturing geothermal wells, a sand-adding device is required. After the sand-adding pipe is extended into the geothermal well for fracturing, the sand-carrying liquid is injected to achieve support operations. There will be a gap between the sand-adding pipe and the edge of the geothermal well. The sand-carrying liquid is injected in a high-pressure state, which can easily cause the sand-carrying liquid to spray upward along the outer wall of the sand-adding pipe. It is difficult to achieve horizontal and vertical synchronous fixed force sealing of the gap at the connection between the sand-adding pipe and the geothermal well, which can easily lead to poor sealing of the geothermal well sand addition. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides the following technical solutions: a sand adding device for geothermal well fracturing operation, comprising a sand adding pipe, an electric cylinder and a pressure sensor, the electric cylinder is fixed on the outer wall of the sand adding pipe, the pressure sensor is fixedly connected to the output end of the electric cylinder, and a bidirectional synchronous constant force sealing sand adding assembly is provided on the lower surface of the pressure sensor; the bidirectional synchronous constant force sealing sand adding assembly comprises a pressure block fixedly arranged on the lower surface of the pressure sensor, a linkage groove ring is fixedly connected to one side of the pressure block, a plurality of hinge shafts are fixedly connected to the outer wall of the linkage groove ring, and a sleeve rod is rotatably connected to the outer wall of each hinge shaft; a linkage shaft is rotatably connected to the inner wall of the sleeve rod and away from the hinge shaft, a concave block is fixedly installed on one end of the linkage shaft, a transverse pressure plate is fixedly connected to the lower surface of the concave block, a rubber ring is fixedly connected to the outer wall of the transverse pressure plate, and the transverse pressure plate and the rubber ring are both slidably connected to the sand adding pipe.

[0006] Preferably, the linkage groove ring is slidably connected to the sand adding pipe, and the plurality of hinge shafts are arranged and distributed equidistantly in a circular ring. The center point of the hinge shaft is higher than the center point of the linkage shaft, and the vertical sections of the hinge shaft and the linkage shaft are both circular. A lowering rod is fixedly connected to the other side of the pressure block, and a lowering ring is fixedly installed on the top of the lowering rod; a plurality of pressure columns are fixedly connected to the lower surface of the lowering ring, and a pressure ring is provided at the bottom end of the pressure column, and the plurality of pressure columns are fixedly connected to the pressure ring, and a rubber convex ring is fixedly connected to the bottom end of the pressure ring, and the rubber convex ring is slidably connected to the rubber ring. The cross-sectional shape of the lowering ring is circular, and the plurality of pressure columns are arranged and distributed equidistantly in a circular ring; the cross-sectional shape of each pressure column is circular. A gap is provided between the pressure ring and the transverse pressure plate, and the outer wall of the pressure ring and the outer wall of the rubber convex ring are both smooth surfaces. The bottom end of each transverse pressing plate is fixedly connected with a sliding sleeve block, and the sliding sleeve block is slidably connected to the sand adding pipe; the inner wall of the sliding sleeve block is slidably connected with a sliding rod, and the sliding rod is fixedly connected to the sand adding pipe.

[0007] When this technology is in use, the electric cylinder pushes the pressure sensor downward, the pressure block moves the linkage groove ring downward, the hinged shaft drives the top of the sleeve rod downward, the linkage shaft drives the concave block away from the center point of the sand-adding pipe, and the concave block drives the transverse pressure plate away from the center point of the sand-adding pipe. The sliding sleeve slides along the inner wall of the sand-adding pipe, and the transverse pressure plate squeezes the rubber ring, causing the rubber ring to deform laterally, and the rubber ring is squeezed and fits in the gap between the geothermal well and the sand-adding pipe. The downward rod drives the downward ring downward, so that the pressure column can drive the pressure ring to move downward, so that the rubber convex ring can deform downward to extrude and seal, and can also cause the rubber convex ring to deform laterally outward to extrude and seal.

[0008] Preferably, a plurality of sand adding holes are provided on the inner wall of the sand adding pipe, and a guide head is fixedly connected to the bottom end of the sand adding pipe, the outer wall diameter of the top end of the guide head is larger than the outer wall diameter of the bottom end thereof, and the top end of the sand adding pipe is fixedly connected to a high-pressure sand adding assembly; the high-pressure sand adding assembly comprises a three-way pipe fixedly arranged on the top end of the sand adding pipe, a sleeve plate is fixedly connected to the outer wall of the sand adding pipe and near the position of the three-way pipe, both top ends of the three-way pipe are fixedly connected to electric valves, the top end of each of the electric valves is fixedly connected to a feed tank, and the top end of the feed tank is fixedly connected to a feed valve.

[0009] A boosting pipe is installed on one side of the feed valve, and the boosting pipe is fixedly connected to the feed tank. A high-pressure fan is fixedly installed at the bottom of the boosting pipe, and the high-pressure fan is used to increase the pressure inside the feed tank; a controller is installed on one side of the three-way pipe, and the controller is fixedly connected to the sleeve plate. Reinforcement plates are fixedly installed on both sides of the sleeve plate, and the inner wall of each reinforcement plate has two mounting holes. The two feed tanks are symmetrically arranged about the center point of the sand adding pipe, and the inner wall of each feed tank is a smooth surface; the two reinforcement plates are symmetrically arranged about the sleeve plate.

[0010] When this technology is used, when sand fracturing is required, the feed valve needs to be connected to the sand-carrying fluid pipe port, and the other feed valve needs to be connected to the high-viscosity fracturing fluid pipeline, so that the sand-carrying fluid can be injected into the feed tank, and the high-viscosity fracturing fluid can be added to the other feed tank. The high-viscosity fracturing fluid in the other feed tank enters another electric valve, opens another electric valve, closes the electric valve, and enters multiple sand-adding holes through the sand-adding pipe to achieve geothermal downhole fracturing operations. Then close another electric valve, start the high-pressure fan, and after pressurization, the boosting pipe will inject pressure into the feed tank, open the electric valve, so that the sand-carrying fluid enters the sand-adding pipe along the three-way pipe.

[0011] Technical effects and advantages of the present invention:

[0012] The present invention adopts a bidirectional synchronous constant force sealing sand adding component. The electric cylinder pushes the pressure sensor to move downward, the pressure block causes the linkage groove ring to move downward, the linkage shaft drives the concave block to move away from the center point of the sand adding tube, the concave block drives the transverse pressure plate to move away from the center point of the sand adding tube, the rubber ring is deformed laterally, the rubber ring is squeezed and fits in the gap between the geothermal well and the sand adding tube, the downward moving rod drives the downward moving ring to move downward, the rubber convex ring can be deformed downward to perform extrusion sealing, and can also be deformed laterally outward to perform extrusion sealing, so that the gap at the connection between the sand adding tube and the geothermal well can be synchronously sealed with constant force laterally and vertically, thereby greatly improving the sand adding sealing performance of the geothermal well. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the sand adding device used for geothermal well fracturing operation of the present invention.

[0014] Figure 2 It is a schematic diagram of the partial structure of the connection between the sand adding pipe and the electric cylinder of the present invention.

[0015] Figure 3 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0016] Figure 4 It is a schematic diagram of the partial structure of the connection between the sleeve rod and the linkage shaft of the present invention.

[0017] Figure 5 It is a schematic diagram of the partial structure of the connection between the sleeve rod and the hinge shaft of the present invention from a front view.

[0018] Figure 6 It is a schematic diagram of the vertical cross-section structure of the sand adding device used for geothermal well fracturing operation of the present invention.

[0019] Figure 7 It is a schematic diagram of the local structure of the vertical section of the connection between the transverse pressing plate and the sliding sleeve block of the present invention.

[0020] Figure 8 It is a schematic diagram of the partial structure of the connection between the sand adding pipe and the sleeve plate of the present invention.

[0021] The accompanying drawings are marked as follows: 1. sand adding pipe; 2. electric cylinder; 3. pressure sensor; 4. pressure block; 5. linkage groove ring; 6. hinge shaft; 7. sleeve rod; 8. linkage shaft; 9. concave block; 10. horizontal pressure plate; 11. rubber ring; 12. lower moving rod; 13. lower moving ring; 14. pressure column; 15. pressure ring; 16. rubber convex ring; 17. sliding sleeve block; 18. sliding rod; 19. sand adding hole; 20. guide head; 21. sleeve plate; 22. three-way pipe; 23. electric valve; 24. feed tank; 25. feed valve; 26. booster pipe; 27. high-pressure fan; 28. controller; 29. ​​reinforcement plate; 30. mounting hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0023] As attached Figure 1 - Attachment Figure 8 A sand adding device for geothermal well fracturing operation is shown, and the sand adding device for geothermal well fracturing operation is provided with a bidirectional synchronous constant force sealing sand adding component and a high-pressure sand adding component. The arrangement of each mechanism and component can achieve horizontal and vertical synchronous constant force sealing of the gap at the connection between the sand adding pipe 1 and the geothermal well, greatly improving the sealing performance of the geothermal well sand adding. The specific structural arrangement of each mechanism and component is as follows.

[0024] In this technical solution, as shown in the attached Figure 1 - Attachment Figure 7As shown, the electric cylinder 2 is fixed on the outer wall of the sand adding tube 1, the pressure sensor 3 is fixedly connected to the output end of the electric cylinder 2, and the lower surface of the pressure sensor 3 is provided with a bidirectional synchronous constant force sealing sand adding component; the bidirectional synchronous constant force sealing sand adding component includes a pressing block 4 fixedly arranged on the lower surface of the pressure sensor 3, one side of the pressing block 4 is fixedly connected with a linkage groove ring 5, the outer wall of the linkage groove ring 5 is fixedly connected with a plurality of hinge shafts 6, and the outer wall of each hinge shaft 6 is rotatably connected with a sleeve rod 7.

[0025] The inner wall of the sleeve rod 7 is rotatably connected to a linkage shaft 8 at a position away from the hinge shaft 6. A concave block 9 is fixedly installed at one end of the linkage shaft 8. A transverse pressure plate 10 is fixedly connected to the lower surface of the concave block 9. A rubber ring 11 is fixedly connected to the outer wall of the transverse pressure plate 10. The transverse pressure plate 10 and the rubber ring 11 are both slidably connected to the sand adding pipe 1. The linkage groove ring 5 is slidably connected to the sand adding pipe 1. Multiple hinge shafts 6 are arranged in a circular ring with equal spacing. The center point of the hinge shaft 6 is higher than the center point of the linkage shaft 8. The vertical sections of the hinge shaft 6 and the linkage shaft 8 are both circular.

[0026] In this technical solution, as shown in the attached Figure 3 - Attachment Figure 7 As shown, the other side of the pressing block 4 is fixedly connected with a downward rod 12, and a downward ring 13 is fixedly installed on the top of the downward rod 12; a plurality of pressing columns 14 are fixedly connected to the lower surface of the downward ring 13, and a pressing ring 15 is provided at the bottom end of the pressing column 14, and the plurality of pressing columns 14 are fixedly connected to the pressing ring 15, and a rubber convex ring 16 is fixedly connected to the bottom end of the pressing ring 15, and the rubber convex ring 16 is slidably connected to the rubber ring 11. The cross-sectional shape of the downward ring 13 is a circular ring, and the plurality of pressing columns 14 are arranged and arranged in a circular ring with equal spacing; the cross-sectional shape of each pressing column 14 is a circle. A gap is provided between the pressure ring 15 and the transverse pressure plate 10, and the outer wall of the pressure ring 15 and the outer wall of the rubber convex ring 16 are both smooth surfaces, so that the pressure block 4 can drive the downward moving rod 12 to move downward, the downward moving rod 12 drives the downward moving ring 13 to move downward, and the pressure column 14 can drive the pressure ring 15 to move downward, and the pressure ring 15 is guided downward and extruded along the inner wall of the rubber convex ring 16. The rubber convex ring 16 can deform downward to extrude and seal, and can also deform outward laterally to extrude and seal.

[0027] In this technical solution, as shown in the attached Figure 1 - Attachment Figure 7As shown, the bottom end of each transverse pressing plate 10 is fixedly connected with a sliding sleeve 17, and the sliding sleeve 17 is slidably connected to the sand adding tube 1; the inner wall of the sliding sleeve 17 is slidably connected with a sliding rod 18, and the sliding rod 18 is fixedly connected to the sand adding tube 1, so that the transverse pressing plate 10 drives the sliding sleeve 17 to move, the sliding sleeve 17 slides along the inner wall of the sand adding tube 1, and the sliding sleeve 17 is guided and lateral along the outer wall of the sliding rod 18. A plurality of sand adding holes 19 are provided on the inner wall of the sand adding tube 1, so that the sand carrying liquid can be injected into the crack through the sand adding holes 19 inside the sand adding tube 1, so as to play a supporting operation of sand adding. The bottom end of the sand adding tube 1 is fixedly connected with a guide head 20, and the outer wall diameter of the top end of the guide head 20 is larger than the outer wall diameter of the bottom end, so that the sand adding tube 1 drives the guide head 20 to move downward.

[0028] In this technical solution, as shown in the attached Figure 8 As shown, the top of the sand adding pipe 1 is fixedly connected with a high-pressure sand adding assembly; the high-pressure sand adding assembly includes a three-way pipe 22 fixedly arranged at the top of the sand adding pipe 1, a sleeve plate 21 is fixedly connected to the outer wall of the sand adding pipe 1 and near the position of the three-way pipe 22, both top ends of the three-way pipe 22 are fixedly connected with electric valves 23, the top of each electric valve 23 is fixedly connected with a feed tank 24, and a feed valve 25 is fixedly connected at the top of the feed tank 24, a boosting pipe 26 is installed on one side of the feed valve 25, and the boosting pipe 26 is fixedly connected with the feed tank 24, and a high-pressure fan 27 is fixedly installed at the bottom end of the boosting pipe 26, and the high-pressure fan 27 is used to increase the pressure inside the feed tank 24; a controller 28 is installed on one side of the three-way pipe 22, and the controller 28 is fixedly connected to the sleeve plate 21, and reinforcement plates 29 are fixedly installed on both sides of the sleeve plate 21, and the inner wall of each reinforcement plate 29 is provided with two mounting holes 30. The two feed tanks 24 are symmetrically arranged about the center point of the sand adding tube 1 , and the inner wall of each feed tank 24 is a smooth surface; the two reinforcement plates 29 are symmetrically arranged about the sleeve plate 21 .

[0029] The working principle of the sand adding device for geothermal well fracturing operation of the present invention is as follows:

[0030] Step 1: During installation, the sand adding pipe 1 is installed in the deep hole inside the geothermal well, and the sand adding pipe 1 drives the guide head 20 to move downward, and the rubber ring 11 is located inside the geothermal well and the lower surface of the two reinforcing plates 29 is attached to the upper surface of the geothermal well. At the same time, a nail is inserted into the installation hole 30 to fix the reinforcing plate 29 on the upper surface of the geothermal well. The sleeve plate 21 is supported by the two reinforcing plates 29 to increase the stability of the sleeve plate 21, and the sleeve plate 21 supports the sand adding pipe 1, and the sand adding pipe 1 supports the tee pipe 22.

[0031] Step 2: When adding sand in bidirectional synchronous fixed force sealing, the electric cylinder 2 is started through the controller 28, and the electric cylinder 2 pushes the pressure sensor 3 downward, and the pressure sensor 3 drives the pressure block 4 downward, and the pressure block 4 makes the linkage groove ring 5 move downward, and the linkage groove ring 5 can drive multiple articulated shafts 6 to move downward synchronously. The articulated shaft 6 drives the top of the sleeve rod 7 to move downward, and the bottom of the sleeve rod 7 drives the linkage shaft 8 away from the center point of the sand adding tube 1, and the linkage shaft 8 drives the concave block 9 away from the center point of the sand adding tube 1, and the concave block 9 drives the transverse pressure plate 10 away from the center point of the sand adding tube 1. At the same time, the transverse pressure plate 10 drives the sliding sleeve block 17 to move, and the sliding sleeve block 17 slides along the inner wall of the sand adding tube 1, and the sliding sleeve block 17 slides along the outer wall of the slide rod 18 for guided transverse movement. The transverse pressing plates 10 further squeeze the rubber ring 11 , so that the rubber ring 11 is deformed transversely under the outward expansion pressure of the multiple transverse pressing plates 10 , and the rubber ring 11 is squeezed and fits in the gap between the geothermal well and the sand adding pipe 1 .

[0032] At the same time, the pressure block 4 drives the downward rod 12 to move downward, and the downward rod 12 drives the downward ring 13 to move downward. The downward ring 13 makes multiple pressure columns 14 move downward synchronously, so that the pressure column 14 can drive the pressure ring 15 to move downward, and the pressure ring 15 is guided and squeezed downward along the inner wall of the rubber convex ring 16, so that the rubber convex ring 16 can deform downward to extrude and seal, and can also make the rubber convex ring 16 deform outward laterally to extrude and seal. Pressure sensing is performed by the pressure sensor 3. When the pressure value sensed by the pressure sensor 3 is the same as the pressure value set by the controller 28, the electric cylinder 2 is closed by the controller 28, so that the gap between the geothermal well and the sand adding pipe 1 can achieve horizontal and vertical synchronous fixed force sealing, and then the sand adding operation is performed.

[0033] Step 3, when adding sand for high-pressure fracturing, when adding sand for fracturing is needed, the feed valve 25 needs to be connected to the sand-carrying liquid pipe port, and the other feed valve 25 needs to be connected to the high-viscosity fracturing liquid pipeline, so that the sand-carrying liquid can be injected into the feed tank 24, and the high-viscosity fracturing liquid can be added to the other feed tank 24. First, by starting another high-pressure blower 27, the high-viscosity fracturing liquid in the other feed tank 24 enters into another electric valve 23, and the other electric valve 23 is opened. When the electric valve 23 is closed, the high-viscosity fracturing liquid can enter the sand adding pipe 1 along the tee pipe 22, and enter the multiple sand adding holes 19 through the sand adding pipe 1, so as to realize the fracturing operation of the underground formation of the geothermal well. Then close another electric valve 23, start the high-pressure blower 27, and after pressurization, the pressure-increasing pipe 26 injects the pressure into the feed tank 24, and the sand-carrying liquid inside the feed tank 24 is injected into the electric valve 23. The electric valve 23 is opened, so that the sand-carrying liquid enters the sand-adding pipe 1 along the three-way pipe 22, and the sand-carrying liquid is injected into the formation fracture through the sand-adding hole 19 inside the sand-adding pipe 1, so as to play a sand-adding support operation.

[0034] The contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand adding device for geothermal well fracturing operation, comprising a sand adding pipe (1), an electric cylinder (2) and a pressure sensor (3), wherein the electric cylinder (2) is fixed to the outer wall of the sand adding pipe (1), and the pressure sensor (3) is fixedly connected to the output end of the electric cylinder (2), characterized in that: A bidirectional synchronous constant force sealing and sand adding component is provided on the lower surface of the pressure sensor (3); The bidirectional synchronous constant force sealing sand adding assembly comprises a pressing block (4) fixedly arranged on the lower surface of the pressure sensor (3), one side of the pressing block (4) is fixedly connected to a linkage groove ring (5), the outer wall of the linkage groove ring (5) is fixedly connected to a plurality of hinge shafts (6), and the outer wall of each hinge shaft (6) is rotatably connected to a sleeve rod (7); A linkage shaft (8) is rotatably connected to the inner wall of the sleeve rod (7) at a position away from the hinge shaft (6); a concave block (9) is fixedly installed on one end of the linkage shaft (8); a transverse pressing plate (10) is fixedly connected to the lower surface of the concave block (9); a rubber ring (11) is fixedly connected to the outer wall of the transverse pressing plate (10); and both the transverse pressing plate (10) and the rubber ring (11) are slidably connected to the sand adding pipe (1).

2. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The linkage groove ring (5) is slidably connected to the sand adding pipe (1), and a plurality of hinge shafts (6) are arranged in a circular ring at equal intervals.

3. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The center point of the articulated shaft (6) is higher than the center point of the linked shaft (8), and the vertical cross-sections of the articulated shaft (6) and the linked shaft (8) are both circular.

4. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The other side of the pressing block (4) is fixedly connected with a downward moving rod (12), and the top end of the downward moving rod (12) is fixedly mounted with a downward moving ring (13); A plurality of pressure columns (14) are fixedly connected to the lower surface of the downward moving ring (13), a pressure ring (15) is provided at the bottom end of each pressure column (14), each of the pressure columns (14) is fixedly connected to the pressure ring (15), a rubber convex ring (16) is fixedly connected to the bottom end of the pressure ring (15), and the rubber convex ring (16) is slidably connected to the rubber ring (11).

5. The sand adding device for geothermal well fracturing operation according to claim 4, characterized in that: The cross-sectional shape of the lower moving ring (13) is annular, and the plurality of pressure columns (14) are arranged in an equidistant manner in a circular ring; The cross-sectional shape of each of the pressure columns (14) is circular.

6. The sand adding device for geothermal well fracturing operation according to claim 4, characterized in that: A gap is provided between the pressure ring (15) and the transverse pressure plate (10), and the outer wall of the pressure ring (15) and the outer wall of the rubber convex ring (16) are both smooth surfaces.

7. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The bottom end of each of the transverse pressing plates (10) is fixedly connected to a sliding sleeve block (17), and the sliding sleeve block (17) is slidably connected to the sand adding pipe (1); The inner wall of the sliding sleeve block (17) is slidably connected with a sliding rod (18), and the sliding rod (18) is fixedly connected to the sand adding pipe (1).

8. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The inner wall of the sand adding pipe (1) is provided with a plurality of sand adding holes (19), and the bottom end of the sand adding pipe (1) is fixedly connected with a guide head (20), and the outer wall diameter at the top end of the guide head (20) is larger than the outer wall diameter at the bottom end thereof.

9. The sand adding device for geothermal well fracturing operation according to claim 1, characterized in that: The top end of the sand adding pipe (1) is fixedly connected to a high pressure sand adding assembly; The high-pressure sand adding assembly comprises a three-way pipe (22) fixedly arranged at the top end of the sand adding pipe (1); a sleeve plate (21) is fixedly connected to the outer wall of the sand adding pipe (1) and close to the three-way pipe (22); both top ends of the three-way pipe (22) are fixedly connected to electric valves (23); the top end of each of the electric valves (23) is fixedly connected to a feed tank (24); and the top end of the feed tank (24) is fixedly connected to a feed valve (25); A boosting pipe (26) is installed on one side of the feed valve (25), and the boosting pipe (26) is fixedly connected to the feed tank (24). A high-pressure fan (27) is fixedly installed at the bottom end of the boosting pipe (26), and the high-pressure fan (27) is used to increase the pressure inside the feed tank (24); A controller (28) is installed on one side of the three-way pipe (22), and the controller (28) is fixedly connected to the sleeve plate (21). Reinforcement plates (29) are fixedly installed on both sides of the sleeve plate (21), and the inner wall of each reinforcement plate (29) is provided with two installation holes (30).

10. The sand adding device for geothermal well fracturing operation according to claim 9, characterized in that: The two feed tanks (24) are symmetrically arranged about the center point of the sand adding pipe (1), and the inner wall of each feed tank (24) is a smooth surface; The two reinforcement plates (29) are symmetrically arranged with respect to the sleeve plate (21).

Images