High-pressure multi-stage series water injection pump

Abstract

The utility model relates to a water injection pump technical field, concretely relates to a high pressure multistage series water injection pump. Including Christmas tree base, Christmas tree base is connected with the fixed sleeve head, the fixed flange is fixed with the concentricity in pump body upper end, and the fixed flange is connected with the concentricity of Christmas tree base and sleeve head, and the pump shaft of pump body penetrates fixed flange and Christmas tree base, and the upper shell is fixed and sealed to have the upper shell in Christmas tree base upper end, and the motor is fixed in upper shell upper end, and the motor shaft lower extreme is connected with the upper end of pump shaft through the coupling fixed connection, and the filter unit is arranged in the upper shell, and the motor shaft penetrates filter unit, and the motor shaft is rotatively sealed with filter unit, and the pump body outside is provided with the centralizer. The utility model realizes the high pressure reliable sealing integrated installation of pump body and wellhead, and the built -in filter unit intercepts the impurity actively, and the design of arc groove and sealing sleeve realizes the on -line cleaning of filtering impurities exempts from disassembly, and the centralizer restrains the sway, and provides excellent axial buffering, gravity moment compensation and installation adaptability.

Description

Technical Field

[0001] This utility model relates to the field of water injection pump technology, specifically to a high-pressure multi-stage series water injection pump. Background Technology

[0002] Currently, the commonly used water injection equipment is a horizontal multistage pump, which can be used for water injection in oil fields. This pump consists of seven impellers connected in series and is driven by an asynchronous motor. This pump must be used in a pump house and cannot be moved at will. This pump is not suitable for booster water injection in single wells or small well groups, or for water injection in peripheral wells or scattered wells.

[0003] When certain single wells or small well groups consisting of several wells within an oilfield block require additional water injection pressure, and the regional centralized water injection trunk line pressure cannot meet their specific needs, horizontal multistage pumps cannot meet production demands. For scattered production wells located on the edge of the oilfield or distributed in a dispersed manner, laying long-distance high-pressure water injection pipelines is not economically viable, and horizontal multistage pumps also cannot meet production demands.

[0004] In the prior art, patent document CN86205795U discloses a vertical series multi-stage water injection pump. Using this pump eliminates the need for investment in water injection pumping stations and frees operators from working under high-temperature and high-noise conditions. It is suitable for high-pressure water injection in oilfield blocks, can be installed and injected locally, and can be easily relocated. However, this pump lacks a filtration unit during operation, and impurities entering the pump body can easily damage the impeller. Furthermore, the pump is relatively long; when the pump's center of gravity shifts and the pump shaft begins to rotate, gravity generates a torque, causing the pump body to sway. The lack of a centering mechanism makes the pump body prone to cracking and damage at its fixing points. Conventional centerers provide radial support through mechanical contact, but their ability to compensate for the axial gravitational torque on the pump body is limited. Utility Model Content

[0005] The main objective of this invention is to provide a high-pressure multi-stage series water injection pump that can filter the incoming liquid and straighten the pump body.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A high-pressure multi-stage series water injection pump includes a tree base, which is fixedly connected to a casing head. A fixed flange is concentrically fixed to the upper end of the pump body, and the fixed flange is concentrically fixedly connected to the tree base and the casing head. The pump shaft of the pump body passes through the fixed flange and the tree base. An upper shell is fixedly and sealed to the upper end of the tree base. An inlet pipe is fixedly and sealed to one side of the upper shell. A motor is fixed to the upper end of the upper shell. The lower end of the motor shaft extends into the upper shell. The motor shaft is rotatably and sealedly connected to the upper end of the upper shell. The lower end of the motor shaft is fixedly connected to the upper end of the pump shaft through a coupling. A filter unit is installed inside the upper shell. The filter unit is located below the inlet pipe. The motor shaft passes through the filter unit and is rotatably and sealedly connected to the filter unit. A centralizer is installed on the outside of the pump body.

[0008] Specifically, a check valve is installed on the outlet at the lower end of the pump body.

[0009] Specifically, a lower flange is concentrically fixed to the lower end of the tree base, and a fixed flange is located between the lower flange and the casing head. The lower flange, the fixed flange, and the casing head are fixedly connected by bolts and nuts.

[0010] Specifically, a sealing ring is provided between the lower flange and the fixed flange, and a sealing ring is provided between the fixed flange and the sleeve head.

[0011] Specifically, an upper flange is fixed to the lower end of the upper shell, and the upper flange is in sealed contact with the upper end of the tree base. The upper flange and the upper end of the tree base are fixedly connected by bolts and nuts, and the coupling is located inside the upper shell.

[0012] Specifically, the filter unit includes a filter ring fixed inside the housing, a water seal fixedly sealed inside the filter ring, a motor shaft passing through the water seal, and the motor shaft rotating and sealingly contacting the water seal.

[0013] Specifically, multiple arc-shaped grooves are provided on the side wall of the upper shell above the filter ring, and a sealing sleeve is provided on the outer side of the upper shell to seal the arc-shaped grooves. A retaining ring is fixed on the outer side of the upper shell below the sealing sleeve, and the retaining ring is connected to the sealing sleeve by multiple bolts.

[0014] Specifically, the stabilizer includes two collars fixedly sleeved on the outside of the pump body. The two collars are fixedly connected by multiple arc-shaped elastic plates, and an elastic block is provided between the elastic plates and the pump body.

[0015] Specifically, the elastic block includes an elastic rubber block, with an arc surface processed at one end of the elastic rubber block facing the elastic sheet. The arc surface of the elastic rubber block fits into the arc surface of the elastic sheet. Multiple slots are opened in the vertical direction on one side of the elastic rubber block facing the elastic sheet. An arc-shaped plate is fixed at one end of the elastic rubber block away from the elastic sheet, and the arc-shaped plate fits into the outer side of the pump body.

[0016] Specifically, the elastic rubber block has a vertical groove at one end near the pump body. A spring rod is fixed in the vertical groove. The upper and lower ends of the spring rod are respectively inserted into the insertion holes of the upper and lower collars. The spring rod includes an outer tube, which is fixed in the vertical groove. A compression spring is concentrically arranged inside the outer tube. Sliding rods are slidably arranged inside the outer tube on the upper and lower sides of the compression spring. The first end of the sliding rod is located inside the outer tube, and the second end of the sliding rod is located outside the outer tube. The two ends of the compression spring are respectively fixedly connected to the first ends of the two sliding rods. The second end of the sliding rod is inserted into the insertion hole of the collar on one side.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The wellhead base, fixed flange, and casing head are concentrically connected by the flange and equipped with multiple sealing rings, which realizes a high degree of integration between the pump body and the wellhead equipment, precise alignment, and reliable high-pressure sealing, simplifying the on-site installation process.

[0019] 2. The motor is fixed by the upper shell, and the motor shaft drives the pump shaft through the coupling. The through parts (upper end of the upper shell, water seal of the filter unit) are all connected by rotating seals to ensure efficient power transmission and zero leakage of internal media.

[0020] 3. The upper shell and the base of the wellhead are sealed together by the upper flange to form a closed cavity, providing environmental protection for the internal pump shaft, coupling and filter unit.

[0021] 4. The filter ring directly filters the water entering the upper casing, effectively intercepting solid impurities in the water and preventing them from entering the pump body and damaging precision components such as the impeller. The water seal on the inner side of the filter ring forms a sealed contact with the rotating motor shaft, which enhances the sealing of the rotating shaft while filtering, preventing unfiltered water from short-circuiting into the pump body.

[0022] 5. The arc-shaped groove forms a cleaning channel. During maintenance, simply loosen the bolts and move the sealing sleeve up to expose the arc-shaped groove to directly remove the impurities accumulated above the filter ring, improving maintenance efficiency and equipment online rate.

[0023] 6. The stabilizer is located on the outside of the pump body, providing radial support, effectively suppressing the shaking caused by the displacement of the pump's center of gravity when the pump shaft rotates, protecting the pump body's fixed points from damage by alternating stress, and extending the equipment's service life.

[0024] 7. An elastic rubber block with an arc surface and an arc-shaped plate are added between the elastic plate and the pump body, which significantly enhances the buffering and compensation capacity for the axial gravitational moment (self-weight and hydraulic unbalance force) of the pump body and improves stability. The grooved design on the elastic rubber block optimizes its mechanical properties, allowing the elastic plate to undergo necessary deformation while ensuring sufficient support force, which is particularly beneficial for adaptive adjustment when the pump body is installed in the well.

[0025] 8. The spring rod stably constrains the elastic rubber block between the elastic plate and the pump body. At the same time, its sliding rod insertion structure allows for easy removal and replacement of the worn elastic rubber block after disassembling the collar, making maintenance convenient.

[0026] 9. This utility model achieves high-pressure reliable sealing and integrated installation of the pump body and wellhead; the built-in filter unit has a dual mechanism (filter ring and water seal) to actively intercept impurities and protect the inside of the pump body; the design of the arc groove and sealing sleeve enables online cleaning of filtered impurities without disassembly; the centralizer suppresses shaking, and the elastic rubber block is grooved and installed through a spring rod, providing excellent axial buffering, gravity torque compensation and installation adaptability, and the elastic block of the centralizer is easy to replace. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the water injection pump after installation.

[0028] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0029] Figure 3 This is a schematic diagram of a centralizer.

[0030] Figure 4 This is a front view of the centralizer.

[0031] Figure 5 This is a sectional view of the spring rod.

[0032] The components in the attached diagram are named as follows: 1. Tree trunk base, 2. Casing head, 3. Fixed flange, 4. Pump body, 5. Lower flange, 6. Check valve, 7. Upper flange, 8. Upper shell, 9. Motor, 10. Inlet pipe, 11. Pump shaft, 12. Filter ring, 13. Water seal, 14. Arc groove, 15. Sealing sleeve, 16. Retaining ring, 17. Collar ring, 18. Elastic sheet, 19. Elastic rubber block, 20. Slot, 21. Spring rod, 22. Arc plate, 23. Motor shaft, 24. Coupling, 211. Outer pipe, 212. Slide rod, 213. Compression spring. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Example 1: Refer to Figures 1-2 As shown, a high-pressure multi-stage series water injection pump includes a tree base 1, which is fixedly connected to a casing head 2. A check valve 6 is installed on the outlet at the lower end of the pump body 4. A fixing flange 3 is concentrically fixed at the upper end of the pump body 4, and the fixing flange 3 is concentrically fixedly connected to the tree base 1 and the casing head 2.

[0035] Specifically, a lower flange 5 is concentrically fixed to the lower end of the wellhead base 1, and a fixed flange 3 is located between the lower flange 5 and the casing head 2. The lower flange 5, the fixed flange 3, and the casing head 2 are fixedly connected by bolts and nuts. A sealing ring is provided between the lower flange 5 and the fixed flange 3, and a sealing ring is provided between the fixed flange 3 and the casing head 2.

[0036] The pump shaft 11 of the pump body 4 passes through the fixed flange 3 and the tree base 1. The upper shell 8 is fixedly and sealed to the upper end of the tree base 1. Specifically, the lower end of the upper shell 8 is fixedly fitted with an upper flange 7, which is in sealing contact with the upper end of the tree base 1. The upper flange 7 and the upper end of the tree base 1 are fixedly connected by bolts and nuts. An inlet pipe 10 is fixedly and sealed to one side of the upper shell 8.

[0037] A motor 9 is fixed at the upper end of the upper shell 8. The lower end of the motor shaft 23 of the motor 9 extends into the upper shell 8. The motor shaft 23 of the motor 9 is rotatably and sealedly connected to the upper end of the upper shell 8. The lower end of the motor shaft 23 is fixedly connected to the upper end of the pump shaft 11 through a coupling 24, which is located inside the upper shell 8.

[0038] A filter unit is installed inside the upper shell 8. The filter unit is located below the inlet pipe 10. The motor shaft 23 passes through the filter unit and is rotatably and sealed to the filter unit.

[0039] The filter unit includes a filter ring 12 fixed inside the housing, a water seal 13 fixedly sealed inside the filter ring 12, a motor shaft 23 passing through the water seal 13, and the motor shaft 23 and the water seal 13 rotating and sealingly contacting each other.

[0040] Multiple arc-shaped grooves 14 are provided on the side wall of the upper shell 8 above the filter ring 12. A sealing sleeve 15 is provided on the outer side of the upper shell 8. The sealing sleeve 15 seals and blocks the arc-shaped grooves 14. A retaining ring 16 is fixed on the outer side of the upper shell 8 below the sealing sleeve 15. The retaining ring 16 is connected to the sealing sleeve 15 by multiple bolts.

[0041] A stabilizer is installed on the outside of the pump body 4.

[0042] In this embodiment, by setting a filter unit, the filter unit can filter the liquid entering the upper shell 8, and prevent impurities from entering the pump body 4 and damaging the impeller.

[0043] After the liquid enters the upper shell 8 through the inlet pipe 10, it is filtered by the filter ring 12, which can intercept impurities in the liquid.

[0044] When it is necessary to clean the impurities intercepted by the filter ring 12, the bolts connecting the retaining ring 16 and the sealing sleeve 15 are removed, and then the sealing sleeve 15 is moved upward outside the upper shell 8. When the sealing sleeve 15 moves above the arc groove 14, the impurities above the filter ring 12 can be removed through the arc groove 14.

[0045] By setting a stabilizer, the stabilizer can support the pump body 4, which can prevent the pump body 4 from shaking due to the shift of the center of gravity of the pump body 4 when the pump shaft 11 rotates, and prevent damage to the fixed point of the pump body 4.

[0046] During operation, the inlet pipe 10 is connected to the storage tank, the motor 9 is started, and the motor shaft 23 of the motor 9 drives the pump shaft 11 to rotate. The liquid in the upper shell 8 passes through the filter ring 12 and then through the tree base 1 into the pump body 4. The liquid in the pump body 4 is pressurized and discharged from the check valve 6 and injected into the well.

[0047] Example 2: Based on Example 1, referring to... Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the stabilizer includes two collars 17 fixedly sleeved on the outside of the pump body 4. The two collars 17 are fixedly connected by multiple arc-shaped elastic plates 18, and elastic blocks are provided between the elastic plates 18 and the pump body 4. The multiple elastic plates 18 are evenly distributed around the circumference of the pump body 4.

[0048] The elastic block includes an elastic rubber block 19. The end of the elastic rubber block 19 facing the elastic sheet 18 is machined with an arc surface. The arc surface of the elastic rubber block 19 fits with the arc surface of the elastic sheet 18. Multiple slots 20 are opened in the vertical direction on the side of the elastic rubber block 19 facing the elastic sheet 18. An arc plate 22 is fixed to the end of the elastic rubber block 19 away from the elastic sheet 18. The arc plate 22 fits with the outer side of the pump body 4.

[0049] A vertical groove is provided at one end of the elastic rubber block 19 near the pump body 4. A spring rod 21 is fixed in the vertical groove. The upper and lower ends of the spring rod 21 are respectively inserted into the insertion holes of the upper and lower collars 17. The spring rod 21 includes an outer tube 211, which is fixed in the vertical groove. A compression spring 213 is concentrically arranged inside the outer tube 211. Sliding rods 212 are slidably arranged inside the outer tube 211 on both sides of the compression spring 213. The first end of the sliding rod 212 is located inside the outer tube 211, and the second end of the sliding rod 212 is located outside the outer tube 211. The two ends of the compression spring 213 are respectively fixedly connected to the first ends of the two sliding rods 212, and the second end of the sliding rod 212 is inserted into the insertion hole of the collar 17 on one side.

[0050] In this embodiment, by setting an elastic rubber block 19 between the elastic sheet 18 and the pump body 4, the pressure-bearing capacity of the elastic sheet is improved, thereby enhancing the compensation capability for the axial gravitational moment of the pump body 4. By setting multiple slots 20, the deformation and supporting force of the elastic sheet 18 can be balanced, ensuring that the elastic sheet 18 has sufficient deformation during the well lowering process, facilitating the lowering of the pump body 4. By setting an arc-shaped plate 22, and having the arc-shaped plate 22 fit against the outer side of the pump body 4, the stability performance of the elastic rubber block 19 can be improved.

[0051] By setting the spring rod 21, the spring rod 21 can make the elastic rubber block 19 stably located between the elastic sheet 18 and the pump body 4. After the slide bar 212 of the spring rod 21 is removed from the insertion hole of the collar 17, it is convenient to remove the elastic rubber block 19 from between the elastic sheet 18 and the pump body 4, making it easy to replace the elastic rubber block 19.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-pressure multi-stage series water injection pump, comprising a treehouse base (1), wherein the treehouse base (1) is fixedly connected to a casing head (2), characterized in that, A fixed flange (3) is concentrically fixed to the upper end of the pump body (4). The fixed flange (3) is concentrically fixedly connected to the tree base (1) and the casing head (2). The pump shaft (11) of the pump body (4) passes through the fixed flange (3) and the tree base (1). The upper end of the tree base (1) is fixedly and sealed with an upper shell (8). One side of the upper shell (8) is fixedly and sealed with an inlet pipe (10). The upper end of the upper shell (8) is fixed with a motor (9). The motor shaft of the motor (9) is ( 23) The lower end extends into the upper shell (8). The motor shaft (23) of the motor (9) is rotatably and sealed to the upper end of the upper shell (8). The lower end of the motor shaft (23) is fixedly connected to the upper end of the pump shaft (11) through a coupling (24). A filter unit is provided inside the upper shell (8). The filter unit is located below the inlet pipe (10). The motor shaft (23) passes through the filter unit. The motor shaft (23) is rotatably and sealed to the filter unit. A stabilizer is provided on the outside of the pump body (4).

2. The high-pressure multi-stage series water injection pump according to claim 1, characterized in that, A check valve (6) is installed on the outlet at the lower end of the pump body (4).

3. The high-pressure multi-stage series water injection pump according to claim 1, characterized in that, The lower end of the tree base (1) is concentrically fixed with a lower flange (5), and a fixed flange (3) is located between the lower flange (5) and the casing head (2). The lower flange (5), the fixed flange (3) and the casing head (2) are fixedly connected by bolts and nuts.

4. The high-pressure multi-stage series water injection pump according to claim 3, characterized in that, A sealing ring is provided between the lower flange (5) and the fixed flange (3), and a sealing ring is provided between the fixed flange (3) and the sleeve head (2).

5. A high-pressure multi-stage series water injection pump according to claim 1, characterized in that, The upper shell (8) is fixed with an upper flange (7) at its lower end. The upper flange (7) is in sealed contact with the upper end of the tree base (1). The upper flange (7) and the upper end of the tree base (1) are fixedly connected by bolts and nuts. The coupling (24) is located inside the upper shell (8).

6. The high-pressure multi-stage series water injection pump according to claim 1, characterized in that, The filter unit includes a filter ring (12) fixed inside the housing. A water seal (13) is fixedly sealed inside the filter ring (12). The motor shaft (23) passes through the water seal (13) and the motor shaft (23) rotates and seals with the water seal (13).

7. A high-pressure multi-stage series water injection pump according to claim 6, characterized in that, Multiple arc-shaped grooves (14) are provided on the side wall of the upper shell (8) above the filter ring (12). A sealing sleeve (15) is provided on the outer side of the upper shell (8). The sealing sleeve (15) seals and blocks the arc-shaped grooves (14). A retaining ring (16) is fixed on the outer side of the upper shell (8) below the sealing sleeve (15). The retaining ring (16) and the sealing sleeve (15) are connected by multiple bolts.

8. A high-pressure multi-stage series water injection pump according to claim 1, characterized in that, The stabilizer includes two collars (17) fixedly sleeved on the outside of the pump body (4). The two collars (17) are fixedly connected by multiple arc-shaped elastic plates (18). An elastic block is provided between the elastic plates (18) and the pump body (4).

9. A high-pressure multi-stage series water injection pump according to claim 8, characterized in that, The elastic block includes an elastic rubber block (19), one end of which is machined with an arc surface facing the elastic sheet (18), the arc surface of the elastic rubber block (19) is in contact with the arc surface of the elastic sheet (18), a plurality of slots (20) are opened in the vertical direction on the side of the elastic rubber block (19) facing the elastic sheet (18), and an arc plate (22) is fixed to the end of the elastic rubber block (19) away from the elastic sheet (18), the arc plate (22) is in contact with the outside of the pump body (4).

10. A high-pressure multi-stage series water injection pump according to claim 9, characterized in that, The elastic rubber block (19) has a vertical groove at one end near the pump body (4). A spring rod (21) is fixed in the vertical groove. The upper and lower ends of the spring rod (21) are respectively inserted into the insertion holes of the upper and lower collars (17). The spring rod (21) includes an outer tube (211). The outer tube (211) is fixed in the vertical groove. A compression spring (213) is concentrically arranged in the outer tube (211). A slide rod (212) is slidably arranged in the outer tube (211) on the upper and lower sides of the compression spring (213). The first end of the slide rod (212) is located in the outer tube (211), and the second end of the slide rod (212) is located outside the outer tube (211). The two ends of the compression spring (213) are respectively fixedly connected to the first ends of the two slide rods (212). The second end of the slide rod (212) is inserted into the insertion hole of the collar (17) on one side.

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