Hydraulic pressurizing water injection device

Abstract

The utility model belongs to the technical field of oil field high-pressure water injection equipment, and discloses a hydraulic pressurizing water injection device which comprises a base, a hydraulic reversing device, a pressurizing device, a driving isolation pipe set and a driving device for driving the hydraulic reversing device to operate are arranged on the base, and the hydraulic reversing device is communicated with the pressurizing device. The supercharging device is communicated with the driving isolation pipe group; the hydraulic pressurizing water injection device is simple in overall structure, the efficiency of the hydraulic pressurizing water injection device can be improved, smooth and impact-free reciprocating reversing is guaranteed, the service life of quick-wear parts is prolonged, the maintenance workload is small, the economic and environment-friendly requirements are met, and the using effect is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-pressure water injection equipment for oil fields, specifically, it relates to a hydraulic booster water injection device. Background Technology

[0002] During oilfield development, as crude oil is continuously extracted, formation pressure gradually decreases. If the formation pressure is too low, crude oil cannot flow naturally to the wellhead, reducing the oilfield's recovery rate. By reinjecting produced water into the formation, formation energy can be replenished, formation pressure can be maintained, and crude oil can be extracted continuously and stably.

[0003] In existing technologies, produced water reinjection in oilfields mainly employs centrifugal and reciprocating injection pumps. Centrifugal injection pumps are used for high-displacement, low-head water injection conditions; reciprocating injection pumps are used for low-displacement, high-head pressurized water injection conditions.

[0004] A reciprocating water pump mainly consists of two parts: a power end and a hydraulic end. The power end uses a crank-connecting rod-slider reciprocating mechanism, while the hydraulic end uses a packing seal for the plunger seal. The check valve is either an integrated inlet / outlet type or a separate spring-loaded check valve.

[0005] Crank-connecting rod reciprocating water pumps have short strokes and fast strokes, and there is rapid acceleration and deceleration during reversal, resulting in large flow pulsations, significant impact on check valves, and high noise. Since the medium is in direct contact with the sealing cavity, the sealing cavity has high requirements for the medium, which can easily cause wear, corrosion, and other failures in the sealing cavity. In addition, due to poor lubricity of the medium, the frictional power consumption of the sealing system increases, the wear of the sealing surface is large, and the sealing fails, leading to medium leakage.

[0006] The existing crank-connecting rod reciprocating water injection pump, as the main equipment for high-pressure water injection in oil fields, can meet the water injection requirements under normal working conditions, but the life of vulnerable parts is short and the maintenance workload is large; in addition, the noise and leakage do not meet environmental protection requirements.

[0007] Chinese patent application number CN202210633368.6 relates to a forced lubrication system for a high-pressure plunger pump packing box assembly in an oilfield. The system includes an oil tank and a packing box assembly. The oil tank is connected to the packing box assembly via an inlet pipe, on which a valve and an oil pump are installed. The packing box assembly is connected to the oil tank via a return pipe, on which a filter is installed. The packing box assembly includes a packing box, the axial direction of which forms a through-plunger cavity. Several packing rings are installed on the inner wall of the plunger cavity. The packing rings have a ring structure and a V-shaped longitudinal section. The packing rings are stacked on top of each other. An inlet pipe connector is installed through the side wall of the packing box. When installed, the pointed ends of the packing rings face the inlet pipe connector. A plunger is installed inside the plunger cavity, and the plunger makes sealing contact with the packing rings during movement. This invention reduces the frequency of plunger pump maintenance, reduces maintenance costs, and improves equipment utilization.

[0008] While this patent reduces friction on the sealing surface, the additional power consumption and potential contamination of the injection medium affect the quality of the injection water.

[0009] Chinese patent application number CN202420183557.2 relates to a reciprocating pump, belonging to the technical field of circulating pump equipment. A drive motor is mounted at one end of a base plate, and a centralizing frame is mounted at the other end. A transmission screw is movably mounted on the centralizing frame. The drive motor is connected to the transmission screw via a reducer. A cylinder is mounted on the centralizing frame, with end caps at both ends. A piston assembly is installed inside the cylinder. A left reciprocating rod is mounted at one end of the piston assembly, extending through the end cap to the outside of the cylinder. The extended left reciprocating rod is connected to the centralizing frame and the transmission screw via a locking device. A right reciprocating rod is mounted at the other end of the piston assembly, extending to the outside of the cylinder. A protective sleeve is fitted onto the extended right reciprocating rod, and the protective sleeve is fixedly connected to the cylinder. This reciprocating pump is easy to maintain, effectively improves the stability of the piston movement of the cylinder, piston, and piston rod, and effectively reduces wear on the piston rod and cylinder wall caused by particulate impurities in the liquid, thus reducing the service life of the reciprocating pump.

[0010] However, although the patent has a certain effect on the lubrication of the mechanism, the sealing of the valve body, and the motion state, the pulsation and impact cannot be eliminated due to the characteristics of the crank connecting rod structure itself. Utility Model Content

[0011] The main technical problem to be solved by this utility model is to provide a hydraulic booster water injection device with a simple overall structure, low noise, small flow pulsation, and high efficiency, which ensures smooth and impact-free reciprocating switching, long service life of vulnerable parts, and low maintenance workload, thereby meeting the requirements of economy and environmental protection.

[0012] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0013] A hydraulic booster water injection device includes a base, on which a hydraulic reversing device, a booster device, a drive isolation pipe assembly, and a drive device for driving the hydraulic reversing device are disposed. The hydraulic reversing device is connected to the booster device, and the booster device is connected to the drive isolation pipe assembly.

[0014] The following are further optimizations of the above technical solution by this utility model:

[0015] The hydraulic reversing device includes a housing fixedly installed on a base, a gear shaft rotatably installed inside the housing, and a left cylinder and a right cylinder fixedly installed on the two side walls of the housing, respectively.

[0016] A rack meshes with the outer surface of the gear shaft, and the two ends of the rack pass through the two side walls of the housing and extend to the left cylinder and the right cylinder, respectively.

[0017] Further optimization: A left piston is fixedly installed at one end of the rack inside the left cylinder, and a right piston is fixedly installed at one end of the rack inside the right cylinder. The left piston can slide inside the left cylinder and make sealing contact with the inner wall of the left cylinder, and the right piston can slide inside the right cylinder and make sealing contact with the inner wall of the right cylinder.

[0018] The left piston and the inner wall of the left cylinder away from the rack are configured as a left sliding cavity, and the right piston and the inner wall of the right cylinder away from the rack are configured as a right sliding cavity.

[0019] Further optimization: The left cylinder has a left oil outlet on its outer wall, which is connected to the left sliding cavity; the right cylinder has a right oil outlet on its outer wall, which is connected to the right sliding cavity.

[0020] Further optimization: The booster device includes a bracket fixedly installed on the base, a first cylinder fixedly installed on the bracket, a second cylinder and a third cylinder fixedly installed on the two sides of the first cylinder respectively, and mechanical seals are provided at the connection points of the second cylinder and the third cylinder with the first cylinder respectively;

[0021] The first, second, and third cylinders are slidably connected by the same piston rod, on which the first, second, and third pistons are fixedly mounted. The first piston is slidably sealed on the inner wall of the first cylinder, the second piston is slidably sealed on the inner wall of the second cylinder, and the third piston is slidably sealed on the inner wall of the third cylinder.

[0022] Further optimization: The first piston divides the first cylinder into a first sliding chamber and a second sliding chamber. The first sliding chamber is provided with a first oil port, which is connected to the left oil outlet. The second sliding chamber is provided with a second oil port, which is connected to the right oil outlet.

[0023] A third sliding cavity is formed between the second piston and the inner wall of the second cylinder away from the first cylinder, and a fourth sliding cavity is formed between the third piston and the inner wall of the third cylinder away from the first cylinder.

[0024] Further optimization: A third oil port is provided on the second cylinder barrel, which is connected to the third sliding cavity; a fourth oil port is provided on the third cylinder barrel, which is connected to the fourth sliding cavity.

[0025] Further optimization: The drive isolation tube group includes a first isolation tube and a second isolation tube. The first isolation tube is provided with a first isolation tube oil port, which is connected to a third oil port. The second isolation tube is provided with a second isolation tube oil port, which is connected to a fourth oil port.

[0026] Further optimization: The other ends of the first isolation pipe and the second isolation pipe are connected by the same inlet pipe and the same outlet pipe;

[0027] A first inlet check valve and a second inlet check valve are connected in series on the inlet pipe. An inlet tee fitting is also connected between the first inlet check valve and the second inlet check valve on the inlet pipe.

[0028] The outlet pipe is connected in series with a first outlet check valve and a second outlet check valve. An outlet tee fitting is also connected between the first outlet check valve and the second outlet check valve on the outlet pipe.

[0029] This utility model adopts the above-mentioned technical solution, with ingenious conception and reasonable structure. It can reinject oilfield produced water back into the formation. By setting up a hydraulic reversing device, the piston rod in the booster device is controlled to reciprocate. The driving medium in the booster device flows bidirectionally in the driving isolation pipe group. The intake or discharge of the injection medium is realized by the pressure difference. Moreover, there is a density difference between the driving medium and the injection medium, which ensures that there is no seepage between the two. This ensures that the injection medium does not directly contact the components in the booster device, extends the service life, reduces maintenance costs, and the overall structure is simple, convenient to manufacture and produce, and has low operating noise.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a top view of the overall structure in an embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the pressurization device in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the hydraulic reversing device in an embodiment of the present invention;

[0034] Figure 4This is a schematic diagram of the structure of the drive isolation tube assembly in an embodiment of this utility model.

[0035] In the diagram: 1. Base; 2. Drive unit; 21. Motor; 22. Reducer; 3. Hydraulic reversing device; 31. Housing; 32. Gear shaft; 33. Rack; 330. Left piston; 331. Right piston; 34. Left cylinder; 35. Right cylinder; 36. Lubricating medium; 37. Left oil outlet; 38. Right oil outlet; 39. Sensor; 4. Pressure booster; 41. Bracket; 42. First cylinder; 43. Second cylinder; 44. Third cylinder; 45. Piston rod; 450. First piston; 451. Second piston; 452. Third piston; 4 60. First oil port; 461. Second oil port; 462. Third oil port; 463. Fourth oil port; 47. Driving medium; 48. Mechanical seal; 5. Driving isolation pipe assembly; 51. First isolation pipe; 510. First isolation pipe oil port; 52. Second isolation pipe; 520. Second isolation pipe oil port; 53. Inlet pipe; 530. First inlet check valve; 540. Second inlet check valve; 55. Outlet pipe; 550. First outlet check valve; 560. Second outlet check valve; 57. Inlet tee fitting; 58. Outlet tee fitting; 6. Control cabinet. Detailed Implementation

[0036] like Figure 1-4 As shown: A hydraulic booster water injection device includes a base 1, on which a hydraulic reversing device 3, a booster device 4, a drive isolation pipe group 5 and a drive device 2 for driving the hydraulic reversing device 3 are provided. The hydraulic reversing device 3 is connected to the booster device 4, and the booster device 4 is connected to the drive isolation pipe group 5.

[0037] The drive device 2 includes a motor 21 fixedly mounted on the base 1, and a reducer 22 is connected to the power output end of the motor 21.

[0038] The power input end of the hydraulic reversing device 3 is connected to the power output end of the reducer 22.

[0039] In this embodiment, the motor 21 and the reducer 22 can be obtained commercially.

[0040] like Figure 2 As shown, the hydraulic reversing device 3 includes a housing 31 fixedly mounted on the base 1, and a gear shaft 32 is rotatably mounted inside the housing 31.

[0041] One end of the gear shaft 32 passes through the side wall of the housing 31 and is connected to the power output end of the reducer 22. With this design, when the motor 21 starts, it drives the reducer 22 to work, thereby driving the gear shaft 32 to rotate.

[0042] The outer surface of the gear shaft 32 is engaged with a rack 33.

[0043] The left cylinder 34 and the right cylinder 35 are fixedly installed on the two side walls of the housing 31, respectively, and the left cylinder 34 and the right cylinder 35 are arranged symmetrically.

[0044] The two ends of the rack 33 pass through the two side walls of the housing 31 and extend into the left cylinder 34 and the right cylinder 35, respectively.

[0045] A left piston 330 is fixedly installed at one end of the rack 33 inside the left cylinder 34, and a right piston 331 is fixedly installed at one end of the rack 33 inside the right cylinder 35.

[0046] The left piston 330 is capable of sliding within the left cylinder 34 and making sealing contact with the inner wall of the left cylinder 34.

[0047] The right piston 331 is capable of sliding within the right cylinder 35 and making sealed contact with the inner wall of the right cylinder 35.

[0048] The left piston 330 and the inner wall of the left cylinder 34 away from the rack 33 are configured as a left sliding cavity, and the right piston 331 and the inner wall of the right cylinder 35 away from the rack 33 are configured as a right sliding cavity.

[0049] Both the left and right sliding cavities are filled with lubricating medium 36.

[0050] The left cylinder 34 has a left oil outlet 37 connected to its outer wall, and the left oil outlet 37 is connected to the left sliding cavity.

[0051] The outer wall of the right cylinder 35 is connected to a right oil outlet 38, which is connected to the right sliding cavity.

[0052] A sensor 39 is fixedly installed on the housing 31 to detect the position of the rack 33. When the rack 33 reaches the preset position, the sensor 39 will send a signal back, which will cause the motor 21 to rotate in the opposite direction, so that the rack 33 can move back and forth.

[0053] like Figure 3 As shown, the pressurization device 4 includes a bracket 41 fixedly mounted on the base 1.

[0054] The first cylinder 42 is fixedly installed on the bracket 41.

[0055] A second cylinder 43 and a third cylinder 44 are fixedly installed on both sides of the first cylinder 42, respectively.

[0056] Mechanical seals 48 are provided at the connection points of the second cylinder 43 and the third cylinder 44 with the first cylinder 42 to prevent leakage.

[0057] The first cylinder 42, the second cylinder 43, and the third cylinder 44 are slidably connected by the same piston rod 45. The first piston 450, the second piston 451, and the third piston 452 are fixedly installed on the piston rod 45. The first piston 450 is slidably and sealingly installed on the inner wall of the first cylinder 42 under the action of the piston rod 45. The second piston 451 is slidably and sealingly installed on the inner wall of the second cylinder 43 under the action of the piston rod 45. The third piston 452 is slidably and sealingly installed on the inner wall of the third cylinder 44 under the action of the piston rod 45.

[0058] The first piston 450 divides the first cylinder 42 into a first sliding chamber and a second sliding chamber.

[0059] The first sliding cavity is provided with a first oil port 460, which is connected to the left oil outlet 37 through an oil pipe.

[0060] The second sliding cavity is provided with a second oil port 461, which is connected to the right oil outlet 38 through an oil pipe.

[0061] With this design, the lubricating medium 36 output from the left sliding cavity and the right sliding cavity can enter the first sliding cavity and the second sliding cavity respectively. When it enters the first sliding cavity, it pushes the first piston 450 to the right, and when it enters the second sliding cavity, it pushes the first piston 450 to the left.

[0062] The second piston 451 and the inner wall of the second cylinder 43 away from the first cylinder 42 are configured as a third sliding cavity, and the third piston 452 and the inner wall of the third cylinder 44 away from the first cylinder 42 are configured as a fourth sliding cavity.

[0063] Both the third and fourth sliding cavities are filled with driving medium 47.

[0064] The second cylinder 43 is provided with a third oil port 462, which is connected to the third sliding cavity.

[0065] The third cylinder 44 is provided with a fourth oil port 463, which is connected to the fourth sliding cavity.

[0066] like Figure 4 As shown, the drive isolation tube group 5 includes a first isolation tube 51 and a second isolation tube 52.

[0067] The first isolation pipe 51 is provided with a first isolation pipe oil port 510, which is connected to the third oil port 462 through a pipeline.

[0068] The second isolation pipe 52 is provided with a second isolation pipe oil port 520, which is connected to the fourth oil port 463 through a pipeline.

[0069] The other ends of the first isolation pipe 51 and the second isolation pipe 52 are connected to the same inlet pipe 53 and the same outlet pipe 55.

[0070] The inlet pipe 53 is connected in series with a first inlet check valve 530 and a second inlet check valve 540. An inlet tee fitting 57 is also connected between the first inlet check valve 530 and the second inlet check valve 540 on the inlet pipe 53. The other end of the inlet tee fitting 57 is connected to the water injection medium to be discharged.

[0071] The first inlet check valve 530 controls the water injection medium to flow only from the inlet tee fitting 57 to the inlet pipe 53 near the first isolation pipe 51.

[0072] The second inlet check valve 540 controls the water injection medium to flow only from the inlet tee fitting 57 to the inlet pipe 53 near the second isolation pipe 52.

[0073] The outlet pipe 55 is connected in series with a first outlet check valve 550 and a second outlet check valve 560. An outlet tee fitting 58 is also connected between the first outlet check valve 550 and the second outlet check valve 560 on the outlet pipe 55. The other end of the outlet tee fitting 58 is connected to the flow direction of the water injection medium.

[0074] The first outlet check valve 550 and the second outlet check valve 560 control the water injection medium to be output to the outlet tee fitting 58.

[0075] A control cabinet 6 for controlling the operation of the device is also fixedly installed on the base 1 near the edge. The control cabinet 6 contains a control system, and the control terminals of the motor 21 and the reducer 22 are electrically connected to the control system.

[0076] The signal output terminal of the sensor 39 is electrically connected to the control system.

[0077] In this embodiment, the driving medium 47 is selected from a medium with a different density difference from the water injection medium (such as commonly lubricating oil) to avoid mutual penetration and contamination between the water injection medium and the driving medium 47.

[0078] In use, the motor 21 rotates forward, driving the gear shaft 32 to rotate clockwise, causing the rack 33 to move to the right. The right piston 331 compresses the volume of the right sliding cavity, and the lubricating medium 36 in the right sliding cavity enters the second sliding cavity through the second oil port 461. As the volume of the second sliding cavity increases, the first piston 450 moves to the left, compressing the volume of the first sliding cavity. At the same time, the second piston 451 moves to the left, compressing the volume of the third sliding cavity. Then, the driving medium 47 in the third sliding cavity is output from the third oil port 462 and enters the first isolation pipe 51 through the first isolation pipe oil port 510.

[0079] When the first piston 450 moves to the left, the third piston 452 moves to the left at the same time, which increases the volume of the fourth sliding chamber. As a result, the driving medium 47 in the second isolation pipe 52 is drawn into the fourth sliding chamber, and at the same time, the pressure in the inlet pipe 53 decreases, so that the water injection medium is drawn into the inlet pipe 53 through the inlet tee fitting 57.

[0080] Under the action of the first inlet check valve 530 and the first outlet check valve 550, as the pressure inside the first isolation pipe 51 increases, the water injection medium is discharged under high pressure through the outlet tee fitting 58.

[0081] When the rack 33 moves to the preset position, the sensor 39 feeds back the signal to the control system, and the control system controls the motor 21 to reverse, thereby realizing the pumping and discharging of the water injection medium.

[0082] For those skilled in the art, any changes, modifications, substitutions, and variations made to the embodiments based on the teachings of this utility model, without departing from the principles and spirit of this utility model, still fall within the protection scope of this utility model.

Claims

1. A hydraulic booster water injection device, comprising a base (1), characterized in that: The base (1) is provided with a hydraulic reversing device (3), a booster device (4), a drive isolation pipe group (5) and a drive device (2) for driving the hydraulic reversing device (3). The hydraulic reversing device (3) is connected to the booster device (4), and the booster device (4) is connected to the drive isolation pipe group (5). The hydraulic reversing device (3) includes a housing (31) fixedly installed on the base (1), a gear shaft (32) is rotatably installed inside the housing (31), and a left cylinder (34) and a right cylinder (35) are fixedly installed on the two side walls of the housing (31). The outer surface of the gear shaft (32) is meshed with a rack (33), and the two ends of the rack (33) pass through the two side walls of the housing (31) and extend to the left cylinder (34) and the right cylinder (35).

2. The hydraulic booster water injection device according to claim 1, characterized in that: The rack (33) is fixedly installed with a left piston (330) at one end inside the left cylinder (34), and a right piston (331) is fixedly installed with one end inside the right cylinder (35). The left piston (330) can slide inside the left cylinder (34) and make sealing contact with the inner wall of the left cylinder (34), and the right piston (331) can slide inside the right cylinder (35) and make sealing contact with the inner wall of the right cylinder (35). The left piston (330) and the inner wall of the left cylinder (34) away from the rack (33) are configured as a left sliding cavity, and the right piston (331) and the inner wall of the right cylinder (35) away from the rack (33) are configured as a right sliding cavity.

3. The hydraulic booster water injection device according to claim 2, characterized in that: The left cylinder (34) has a left oil outlet (37) connected to the outer wall, and the left oil outlet (37) is connected to the left sliding cavity. The right cylinder (35) has a right oil outlet (38) connected to the outer wall, and the right oil outlet (38) is connected to the right sliding cavity.

4. The hydraulic booster water injection device according to claim 3, characterized in that: The booster device (4) includes a bracket (41) fixedly installed on the base (1), a first cylinder (42) fixedly installed on the bracket (41), a second cylinder (43) and a third cylinder (44) fixedly installed on both sides of the first cylinder (42), and a mechanical seal (48) is provided at the connection between the second cylinder (43) and the third cylinder (44) and the first cylinder (42). The first cylinder (42), the second cylinder (43), and the third cylinder (44) are slidably connected by the same piston rod (45). The first piston (450), the second piston (451), and the third piston (452) are fixedly installed on the piston rod (45). The first piston (450) is slidably and sealed on the inner wall of the first cylinder (42), the second piston (451) is slidably and sealed on the inner wall of the second cylinder (43), and the third piston (452) is slidably and sealed on the inner wall of the third cylinder (44).

5. The hydraulic booster water injection device according to claim 4, characterized in that: The first piston (450) divides the first cylinder (42) into a first sliding chamber and a second sliding chamber. The first sliding chamber is provided with a first oil port (460), which is connected to the left oil outlet (37). The second sliding chamber is provided with a second oil port (461), which is connected to the right oil outlet (38). The second piston (451) and the second cylinder (43) are connected in a third sliding cavity away from the inner wall of the first cylinder (42), and the third piston (452) and the third cylinder (44) are connected in a fourth sliding cavity away from the inner wall of the first cylinder (42).

6. The hydraulic booster water injection device according to claim 5, characterized in that: The second cylinder (43) is provided with a third oil port (462), which is connected to the third sliding cavity. The third cylinder (44) is provided with a fourth oil port (463), which is connected to the fourth sliding cavity.

7. The hydraulic booster water injection device according to claim 6, characterized in that: The drive isolation tube assembly (5) includes a first isolation tube (51) and a second isolation tube (52). The first isolation tube (51) is provided with a first isolation tube oil port (510), which is connected to a third oil port (462). The second isolation tube (52) is provided with a second isolation tube oil port (520), which is connected to a fourth oil port (463).

8. The hydraulic booster water injection device according to claim 7, characterized in that: The first isolation pipe (51) and the second isolation pipe (52) are connected at the other end to the same inlet pipe (53) and the same outlet pipe (55); A first inlet check valve (530) and a second inlet check valve (540) are connected in series on the inlet pipe (53). An inlet tee fitting (57) is also connected between the first inlet check valve (530) and the second inlet check valve (540) on the inlet pipe (53). The outlet pipe (55) is connected in series with a first outlet check valve (550) and a second outlet check valve (560). An outlet tee fitting (58) is also connected between the first outlet check valve (550) and the second outlet check valve (560) on the outlet pipe (55).

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