High-pressure water injection conveying device for shale oil field

Abstract

The present application relates to the technical fields of shale oil oilfield high-pressure water injection, especially to a shale oil oilfield high-pressure water injection conveying device, comprising a box, a rack mechanism and a gear; the gear is coaxially fixed on a shaft body arranged longitudinally, the shaft body penetrates the box from the middle and is rotationally and sealingly connected with the box; two rack mechanisms are both horizontally arranged transversely and respectively engaged with the upper and lower sides of the gear; two first cylinder bodies are respectively sealingly fixed on the transverse sides of the box, a second cylinder body is fixedly and communicatively connected to the end of the first cylinder body away from the box, and a discharge port is arranged at the end of the second cylinder body away from the first cylinder body; the two ends of the rack mechanism respectively extend to the interiors of the two first cylinder bodies corresponding in position, and the two ends of the rack mechanism are connected with plunger rods through movable joints. The rack replacement operation is simple and efficient, the rack replacement time is shortened, and the whole water injection device can be quickly put into use again.

Description

Technical Field

[0001] This invention relates to the field of high-pressure water injection technology for shale oil fields, specifically to a high-pressure water injection and delivery device for shale oil fields. Background Technology

[0002] Shale oil, a highly anticipated unconventional oil and gas resource in the current petroleum industry, is primarily found in shale-dominated rock formations. Its core extraction technology is hydraulic fracturing, which involves injecting a large volume of high-pressure water-based or chemical-based mixture (precisely proportioned water, sand, and a small amount of chemical additives) into the target shale formation through the wellbore. Under high pressure, the proppant (sand particles) in the mixture propagates deep into the rock formation along with the fractures, forming a multi-level fracture network that effectively breaks down the low permeability barrier of the shale matrix. The chemical additives optimize fluid performance through drag reduction and swelling prevention, ensuring long-term flow through the fractures. This process allows the previously sealed shale oil to converge into the wellbore along the artificial fracture system. Combined with horizontal well multi-stage fracturing and temporary plugging and diversion fracturing technologies, it significantly increases single-well production, becoming a key technological system driving the global unconventional oil and gas revolution.

[0003] In high-pressure water injection operations during shale oil extraction, multi-plunger reciprocating plunger pumps are core equipment. The rack and pinion assembly in its transmission system is subjected to harsh conditions of high-frequency reciprocating loads and alternating stresses, making the tooth surfaces highly susceptible to abrasive wear, fatigue pitting, and galling failure. This leads to problems such as decreased transmission accuracy, pump displacement fluctuations, and unstable injection pressure, necessitating replacement. However, existing rack and pinion designs generally employ an integral structure, highly integrated with the pump body or transmission box. Replacement requires the sequential disassembly of more than ten related components, including bearing housings, sealing components, and drive shafts, involving multiple processes such as bolt tightening, shaft alignment, and seal reassembly. The operation is complex and relies on specialized tools. A single replacement operation can take 4-8 hours, during which the equipment is completely shut down, directly resulting in shale oil production losses and a surge in non-production time costs. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure water injection and delivery device for shale oil fields to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A high-pressure water injection and delivery device for shale oil fields includes a housing, a rack and pinion mechanism, and gears; the gears are coaxially fixed on a longitudinally arranged shaft, which passes through the housing from the middle and is rotatably and sealingly connected to the housing. Both rack mechanisms are horizontally arranged and mesh with each other on the upper and lower sides of the gear, respectively; Two first cylinders are sealed and fixed on both sides of the box. The end of the first cylinder away from the box is fixedly connected to the second cylinder. The end of the second cylinder away from the first cylinder is provided with an outlet. The two ends of the rack mechanism extend into the interior of the two first cylinders corresponding to their positions, and the two ends of the rack mechanism are connected to plunger rods through movable joints. The end of the plunger rod away from the rack mechanism is slidably sealed inside the corresponding second cylinder. The rack mechanism includes a rack frame, a first rack, and two second racks. The rack frame has a vertically penetrating strip-shaped hole. The first rack and the two second racks are detachably fixed inside the strip-shaped hole, and the two second racks are respectively located on the lateral sides of the first rack. The box body has through holes at both the top and bottom ends. The through holes are sealed by sealing caps. The sealing caps are fixed to the box body by bolts. The lengths of the first and second racks are both less than the lateral width of the through hole.

[0006] Preferably, insert plates are fixed at both ends of the inner wall of the strip hole, and a second slot is provided at the end of the second rack away from the first rack, and the insert plates and the second slot are matched. Both ends of the first rack are fixed with positioning blocks, and the second rack has a first slot at the end near the first rack. The positioning blocks are fixedly installed in the corresponding first slots by fastening screws.

[0007] Preferably, two protrusions are fixed at both ends of the inner wall of the strip hole, and two third slots are opened at the end of the second rack away from the first rack. The two third slots are respectively arranged on the upper and lower sides of the second slot, and the third slots are matched with the protrusions.

[0008] Preferably, the top longitudinal sides of the first rack and the second rack are both fixed with wing edges, and the bottom of the wing edges is provided with a strip-shaped locking piece, and the rack frame is provided with a strip-shaped locking groove that matches the strip-shaped locking piece.

[0009] Preferably, a threaded rod handle is threaded through the sealing cover, and a pressure roller is rotatably connected to the bottom of the threaded rod handle, the pressure roller making rolling contact with the rack and pinion mechanism.

[0010] Preferably, the movable joint includes a connecting seat, an annular cover, a circular plate, and two sets of universal balls. One end of the connecting seat is fixedly connected to the rack mechanism, and the other end of the connecting seat is fixedly connected to the annular cover. The other end of the connector is provided with a circular groove, the circular plate is placed inside the circular groove and is sandwiched in the middle by two sets of universal balls, and the diameter of the circular plate is smaller than the inner diameter of the circular groove. The circular plate is fixedly connected to the plunger rod via a connecting rod, and the diameter of the connecting rod is smaller than the inner diameter of the annular cover.

[0011] Preferably, a first cylinder bottom is fixedly installed at the end of the first cylinder body away from the housing, the second cylinder body is fixedly connected to the first cylinder bottom, a second cylinder bottom is fixedly installed at the end of the second cylinder body away from the first cylinder body, and the outlet is opened on the second cylinder bottom; a plurality of tie rods are provided between the first cylinder bottom and the second cylinder bottom.

[0012] Preferably, a support frame is provided between the two first cylinders located on the same side of the housing to separate the two first cylinders located on the same side of the housing.

[0013] Preferably, an angle sensor is coaxially mounted on one end of the shaft, and a protective cover is fixedly installed on the housing, with the angle sensor located inside the protective cover.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention detachably mounts the first rack and two second racks onto a rack frame, with through holes at both the top and bottom of the housing. During normal water filling, the through holes are closed by a sealing cap. When the racks need to be replaced, simply open the sealing cap, remove the first rack and two second racks in sequence, replace them with new ones, and then close the sealing cap again. The rack replacement operation is simple and efficient, shortening the rack replacement time and allowing the entire water filling device to be quickly put back into use.

[0015] This invention utilizes a movable joint to clamp a circular plate inside a circular groove using two sets of universal balls. The diameter of the circular plate is smaller than the inner diameter of the circular groove, allowing the circular plate to move within a small range without dead angles within the groove. Simultaneously, a connecting rod is used to fix the circular plate and the plunger rod together. The diameter of the connecting rod is smaller than the inner diameter of the annular cover, allowing the connecting rod to move within a small range without dead angles within the range defined by the annular cover. This prevents radial vibrations generated during the movement of the rack and pinion mechanism from being transmitted to the plunger rod, ensuring high-precision linear reciprocating motion of the plunger rod and reducing water injection pressure fluctuations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another perspective of the present invention; Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 4 This is a cross-sectional structural diagram of the present invention; Figure 5This is a schematic diagram of the structure of the shaft, gear, and protective cover of the present invention; Figure 6 This is a schematic diagram of the structure of the shaft, gear, angle sensor and protective cover of the present invention; Figure 7 This is a schematic diagram of the structure of the shaft, rack mechanism and plunger rod of the present invention; Figure 8 This is a schematic diagram of the rack and pinion mechanism of the present invention; Figure 9 This is a cross-sectional three-dimensional structural diagram of the rack mechanism of the present invention; Figure 10 This is a cross-sectional three-dimensional structural diagram of the rack frame of the present invention; Figure 11 This is a schematic diagram of the structure of the first and second racks of the present invention; Figure 12 This is a schematic diagram of the structure of the first rack of the present invention; Figure 13 This is a schematic diagram of the cross-sectional structure of the rack frame of the present invention; Figure 14 This is a cross-sectional three-dimensional structural diagram of the movable joint of the present invention; Figure 15 This is a schematic diagram of the structure of the housing of the present invention.

[0017] In the diagram: 1. Housing; 101. Through hole; 2. Shaft; 3. Sealing cover; 4. First cylinder body; 5. Second cylinder body; 6. First cylinder bottom; 7. Tie rod; 8. Second cylinder bottom; 801. Discharge port; 9. Support frame; 10. Rack mechanism; 1001. Rack frame; 10011. Strip hole; 10012. Strip groove; 1002. First rack; 10021. Positioning block; 10022. Fastening screw; 1003. Second rack; 10031. First slot ; 10032, Second slot; 10033, Third slot; 1004, Wing edge; 10041, Strip-shaped clip; 1005, Insert plate; 1006, Protrusion; 11, Piston rod; 12, Gear; 13, Pressure roller; 14, Threaded rod handle; 15, Movable joint; 1501, Connecting seat; 15011, Circular groove; 1502, Annular cover; 1503, Connecting rod; 1504, Circular plate; 1505, Universal ball; 16, Angle sensor; 17, Protective cover. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-15 The present invention provides a technical solution: The high-pressure water injection and delivery device for shale oil fields includes a housing 1, a rack and pinion mechanism 10, and gears 12; the structure of the housing 1 is as follows: Figure 15 As shown, it has a hollow structure.

[0020] The gear 12 is coaxially fixed on the longitudinally arranged shaft 2. The fixed connection method between the gear 12 and the shaft 2 is existing technology and is not limited here.

[0021] The shaft 2 passes through the middle of the housing 1 and is rotatably sealed to the housing 1; for example, the shaft 2 is rotatably sealed to the housing 1 through the cooperation between the bearing, the rotary seal and other structures, so that the gear 12 is housed inside the housing 1.

[0022] An angle sensor 16 is coaxially mounted on one end of the shaft 2, and a protective cover 17 is fixedly installed on the housing 1. The angle sensor 16 is located inside the protective cover 17. The angle sensor 16 is used to monitor the rotation angle of the shaft 2 to prevent the rotation angle of the shaft 2 from being too large or too small.

[0023] The shaft 2 is driven to rotate by a drive device, which can be an electric motor.

[0024] Both rack mechanisms 10 are horizontally arranged and meshed on the upper and lower sides of the gear 12 respectively. By rotating the shaft 2, the two rack mechanisms 10 can move synchronously through the meshing relationship between the rack mechanism 10 and the gear 12. For example, when one rack mechanism 10 moves to the left, the other rack mechanism 10 will move to the right at the same speed.

[0025] Two first cylinders 4 are sealed and fixed on both sides of the box body 1. The two ends of the rack mechanism 10 extend into the interior of the two first cylinders 4 corresponding to their positions. That is, the rack mechanism 10 will move left and right inside the two first cylinders 4.

[0026] The first cylinder 4 is fixedly connected to the second cylinder 5 at the end away from the housing 1. The second cylinder 5 is provided with an outlet 801 at the end away from the first cylinder 4. The two ends of the rack mechanism 10 are connected to the plunger rod 11 through the movable joint 15. The plunger rod 11 is slidably sealed at the end away from the rack mechanism 10 inside the corresponding second cylinder 5.

[0027] The first cylinder body 4 is fixedly installed with a first cylinder bottom 6 at the end away from the housing 1. The second cylinder body 5 is fixedly connected to the first cylinder bottom 6 by bolts or other structures. The second cylinder bottom 8 is fixedly installed at the end of the second cylinder body 5 away from the first cylinder body 4. The discharge port 801 is opened on the second cylinder bottom 8. Several tie rods 7 are provided between the first cylinder bottom 6 and the second cylinder bottom 8.

[0028] A support frame 9 is provided between the two first cylinders 4 located on the same side of the housing 1 to separate the two first cylinders 4 located on the same side of the housing 1.

[0029] In operation, the movement of the rack and pinion mechanism 10 drives the plunger rod 11 to move synchronously inside the second cylinder 5, thereby changing the volume inside the second cylinder 5. Specifically, when the volume inside the second cylinder 5 gradually increases, external water enters the second cylinder 5; when the volume inside the second cylinder 5 gradually decreases, the water inside the second cylinder 5 is discharged. Thus, in conjunction with a check valve, high-pressure water injection can be achieved. The specific principle of high-pressure water injection is as follows: two pipes (an inlet pipe and an outlet pipe) are connected to the outlet 801 through two check valves (an inlet check valve and an outlet check valve). The inlet check valve allows external water to enter the second cylinder 5 through the inlet pipe, and the outlet check valve allows water inside the second cylinder 5 to be discharged through the outlet pipe. Therefore, during the reciprocating motion of the plunger rod 11, external water first enters the second cylinder 5 through the inlet pipe and then exits through the outlet pipe. During the drainage process, the plunger rod 11 squeezes the water inside the second cylinder 5. Under the squeezing action of the plunger rod 11, the pressure of the water inside the second cylinder 5 rises rapidly. The high pressure pushes the control outlet check valve to open, and the high-pressure water inside the second cylinder 5 is discharged through the outlet pipe, realizing high-pressure water injection. At the same time, the inlet check valve will be tightly closed because the pressure inside the cylinder is higher than the external water pressure, preventing the high-pressure water from flowing back to the external water source, so that the water inside the second cylinder 5 is kept under high pressure for discharge. Each reciprocating motion of the plunger rod 11 will result in a high-pressure water injection.

[0030] In this technical solution, the rack mechanism 10 includes a rack frame 1001, a first rack 1002, and two second racks 1003. The rack frame 1001 has a vertically penetrating strip hole 10011. The first rack 1002 and the second rack 1003 have the same width. The width of the strip hole 10011 is just enough to install the first rack 1002 and the second rack 1003. The first rack 1002 and the two second racks 1003 are detachably fixed inside the strip hole 10011, and the two second racks 1003 are respectively located on the lateral sides of the first rack 1002. The upper and lower ends of the housing 1 are provided with through holes 101. The through holes 101 are sealed by sealing caps 3. The sealing caps 3 are fixed to the housing 1 by bolts. The length of the first rack 1002 and the length of the second rack 1003 are both less than the lateral width of the through hole 101.

[0031] In the above solution, the first rack 1002 and two second racks 1003 are detachably mounted on the rack frame 1001, and through holes 101 are provided at both the upper and lower ends of the housing 1. During normal water filling, the through holes 101 are covered by the sealing cover 3. When the racks need to be replaced, the sealing cover 3 is opened directly, and the first rack 1002 and two second racks 1003 are taken out in sequence, and new first racks 1002 and two second racks 1003 are replaced. Then the sealing cover 3 is closed. The rack replacement operation is simple and efficient, shortens the rack replacement time, and allows the entire water filling device to be put back into use quickly.

[0032] Furthermore, insert plates 1005 are fixed to both ends of the inner wall of the strip-shaped hole 10011. A second slot 10032 is provided at the end of the second rack 1003 away from the first rack 1002, and the insert plates 1005 and the second slot 10032 are matched. In the installed state, the insert plates 1005 are inserted into the interior of the second slot 10032, thereby ensuring the installation accuracy of the second rack 1003 and its stability during transmission. In addition, both ends of the first rack 1002 are fixed A positioning insert 10021 is provided. The positioning insert 10021 has a structure that is wider at the top and narrower at the bottom. For example, the cross-sectional shape of the positioning insert 10021 in this technical solution is an isosceles trapezoid. A first slot 10031 is provided at one end of the second rack 1003 near the first rack 1002. The cross-sectional shape of the first slot 10031 is the same as that of the positioning insert 10021. The positioning insert 10021 is fixedly installed in the corresponding first slot 10031 by fastening screws 10022.

[0033] In this design, the length of the insert plate 1005 is limited. Specifically, the process of disassembling the first rack 1002 and the two second racks 1003 is as follows: First, unscrew the fastening screw 10022, then move upward and remove the first rack 1002 until it is removed from the housing 1 through the through hole 101. Then, slide one of the second racks 1003 laterally until it abuts against the other second rack 1003. At this point, the insert plate 1005 is completely removed from the inside of the second slot 10032, so one of the second racks 1003 can be removed by moving upward. The other second rack 1003 is removed in the same way. During the entire removal process, it must be ensured that the insert plate 1005 does not obstruct the disassembly of the second racks 1003. Furthermore, the entire removal process is carried out through the through hole 101, making the operation simple and convenient.

[0034] Furthermore, in this technical solution, two protrusions 1006 are fixed at both ends of the inner wall of the strip-shaped hole 10011. Two third slots 10033 are provided at the end of the second rack 1003 away from the first rack 1002. The two third slots 10033 are respectively located on the upper and lower sides of the second slot 10032, and the third slots 10033 are matched with the protrusions 1006. In the installed state, the protrusions 1006 are inserted into the interior of the third slots 10033, which can improve the structural strength of the second rack 1003 in the working state, and also improve the installation accuracy of the second rack 1003.

[0035] Both sides of the top longitudinal direction of the first rack 1002 and the second rack 1003 are fixed with wing edges 1004. The wing edges 1004 are used to support the first rack 1002 and the second rack 1003 so that they do not fall out of the inside of the strip hole 10011. Moreover, the cross-sectional shape of the first rack 1002 and the second rack 1003 can also be designed as an isosceles trapezoidal structure that is wider at the top and narrower at the bottom, thereby ensuring their installation accuracy.

[0036] A strip-shaped retainer 10041 is provided at the bottom of the wing 1004, and a strip-shaped slot 10012 matching the strip-shaped retainer 10041 is provided on the rack frame 1001. The strip-shaped retainer 10041 and the strip-shaped slot 10012 are used to limit the longitudinal position of the first rack 1002 and the second rack 1003.

[0037] To improve the stability of the rack mechanism 10 during movement, a threaded rod handle 14 is threaded through the sealing cover 3. A pressure roller 13 is rotatably connected to the bottom of the threaded rod handle 14, and the pressure roller 13 makes rolling contact with the rack mechanism 10. Rotating the threaded rod handle 14 can adjust the pressure band between the pressure roller 13 and the top surface of the rack mechanism 10, ensuring that the rack mechanism 10 moves in a stable linear motion.

[0038] The movable joint 15 includes a connecting seat 1501, an annular cover 1502, a circular plate 1504, and two sets of universal balls 1505. The number of universal balls 1505 in each set is not limited here. For example, the number of universal balls 1505 in each set can be 18. One end of the connecting seat 1501 is fixedly connected to the rack mechanism 10, and the other end of the connecting seat 1501 is fixedly connected to the annular cover 1502 by bolts.

[0039] The other end of the connecting seat 1501 is provided with a circular groove 15011. A circular plate 1504 is disposed inside the circular groove 15011 and is sandwiched in the middle by two sets of universal balls 1505. The diameter of the circular plate 1504 is smaller than the inner diameter of the circular groove 15011, so that the circular plate 1504 can move within a small range without dead angles inside the circular groove 15011. The circular plate 1504 is fixedly connected to the plunger rod 11 through the connecting rod 1503, and the diameter of the connecting rod 1503 is smaller than the inner diameter of the annular cover 1502, so that the connecting rod 1503 can move within a small range without dead angles within the range defined by the annular cover 1502.

[0040] In the above scheme, the circular plate 1504 is clamped inside the circular groove 15011 by the movable joint 15 and two sets of universal balls 1505. The diameter of the circular plate 1504 is smaller than the inner diameter of the circular groove 15011, allowing the circular plate 1504 to move within a small range without dead angles inside the circular groove 15011. At the same time, the circular plate 1504 and the plunger rod 11 are fixedly connected by the connecting rod 1503. The diameter of the connecting rod 1503 is smaller than the inner diameter of the annular cover 1502, allowing the connecting rod 1503 to move within a small range without dead angles within the range defined by the annular cover 1502. This ensures that the radial vibration generated by the rack mechanism 10 during movement will not be transmitted to the plunger rod 11, guaranteeing the high-precision linear reciprocating motion of the plunger rod 11 and reducing water injection pressure fluctuations. In addition, the radial vibration of the rack mechanism 10 caused by small precision differences after rack assembly and disassembly will not be transmitted to the plunger rod 11.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure water injection and delivery device for shale oil fields, characterized in that, It includes a housing, a rack and pinion mechanism, and a gear; the gear is coaxially fixed on a longitudinally arranged shaft, which passes through the middle of the housing and is rotatably and sealingly connected to the housing. Both rack mechanisms are horizontally arranged and mesh with each other on the upper and lower sides of the gear, respectively; Two first cylinders are sealed and fixed on both sides of the box. The end of the first cylinder away from the box is fixedly connected to the second cylinder. The end of the second cylinder away from the first cylinder is provided with an outlet. The two ends of the rack mechanism extend into the interior of the two first cylinders corresponding to their positions, and the two ends of the rack mechanism are connected to plunger rods through movable joints. The end of the plunger rod away from the rack mechanism is slidably sealed inside the corresponding second cylinder. The rack mechanism includes a rack frame, a first rack, and two second racks. The rack frame has a vertically penetrating strip-shaped hole. The first rack and the two second racks are detachably fixed inside the strip-shaped hole, and the two second racks are respectively located on the lateral sides of the first rack. The box body has through holes at both the top and bottom ends. The through holes are sealed by sealing caps. The sealing caps are fixed to the box body by bolts. The lengths of the first and second racks are both less than the lateral width of the through hole.

2. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, Both ends of the inner wall of the strip-shaped hole are fixed with insert plates, and a second slot is provided at the end of the second rack away from the first rack. The insert plates and the second slot are matched. Both ends of the first rack are fixed with positioning blocks, and the second rack has a first slot at the end near the first rack. The positioning blocks are fixedly installed in the corresponding first slots by fastening screws.

3. The high-pressure water injection and delivery device for shale oil fields according to claim 2, characterized in that, Two protrusions are fixed at both ends of the inner wall of the strip hole. Two third slots are opened at the end of the second rack away from the first rack. The two third slots are respectively set on the upper and lower sides of the second slot, and the third slots are matched with the protrusions.

4. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, Both the top longitudinal sides of the first and second racks are fixed with wing edges, and the bottom of the wing edges is provided with a strip-shaped clamp. The rack frame is provided with a strip-shaped groove that matches the strip-shaped clamp.

5. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, A threaded rod handle is threaded through the sealing cap, and a pressure roller is rotatably connected to the bottom of the threaded rod handle. The pressure roller is in rolling contact with the rack and pinion mechanism.

6. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, The movable joint includes a connecting seat, an annular cover, a circular plate, and two sets of universal balls. One end of the connecting seat is fixedly connected to the rack mechanism, and the other end of the connecting seat is fixedly connected to the annular cover. The other end of the connector is provided with a circular groove, the circular plate is placed inside the circular groove and is sandwiched in the middle by two sets of universal balls, and the diameter of the circular plate is smaller than the inner diameter of the circular groove. The circular plate is fixedly connected to the plunger rod via a connecting rod, and the diameter of the connecting rod is smaller than the inner diameter of the annular cover.

7. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, The first cylinder body has a first cylinder bottom fixedly installed at the end away from the housing. The second cylinder body is fixedly connected to the first cylinder bottom. The second cylinder bottom is fixedly installed at the end of the second cylinder body away from the first cylinder body. The discharge port is opened on the second cylinder bottom. Several tie rods are provided between the first cylinder bottom and the second cylinder bottom.

8. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, A support frame is provided between the two first cylinders located on the same side of the housing to separate the two first cylinders located on the same side of the housing.

9. The high-pressure water injection and delivery device for shale oil fields according to claim 1, characterized in that, An angle sensor is coaxially mounted on one end of the shaft, and a protective cover is fixedly installed on the housing, with the angle sensor located inside the protective cover.

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