Underground pump body structure for hydraulic rodless drainage system

Abstract

The utility model discloses an underground pump body structure for a hydraulic rodless drainage system, which relates to the technical field of oil extraction and comprises a sleeve, a piston rod is movably connected to the upper side of the sleeve, an oil well pump fixing plunger is movably connected to the lower side of the sleeve, and mounting frames are connected to two sides of the sleeve. By the adoption of the structure, the installation frames are fixed to the two sides of the sleeve, the filter screen plates are installed in the installation frames, impurities can be filtered out, the flow speed is preliminarily reduced, liquid flows through the first flow slowing plate and the second flow slowing plate, and the flow slowing grooves are formed in the first flow slowing plate and the second flow slowing plate and used for guiding the flowing direction of the liquid; and then the liquid further slows down the flow velocity of the liquid through the diffuser, and the liquid is stably guided into the pump body, so that the problems that the flow velocity fluctuation is large and the pump body is damaged by pressure impact in the process that the liquid enters the pump body from the screen pipe are solved, the overall performance of the system is improved, and the service life of the system is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of oil production technology, and specifically relates to a downhole pump body structure for a hydraulic rodless pumping system. Background Technology

[0002] With the continuous development of oil and gas extraction technologies, especially for oil and gas reservoir development under complex geological conditions, traditional rod pump oil production technology has gradually revealed its limitations. Particularly in highly deviated wells, horizontal wells, and wells with special geological conditions such as corrosive media, heavy oil, and high sand content, rod pump oil production technology often faces problems such as severe rod and tubing wear, high maintenance costs, and short equipment lifespan. Therefore, hydraulic rodless pumping systems have emerged as an effective way to solve these problems.

[0003] For example, Chinese patent CN207315317U discloses a rodless oil production string for a pumping unit well, which includes a polished rod, a hydraulic plunger pump, a concentric double pipe, a double plunger oil pump, a screen pipe, and tubing connected in sequence from top to bottom. The upper end of the polished rod is connected to the pumping unit head, and the lower end is connected to the piston rod of the hydraulic plunger pump. The hydraulic plunger pump, the concentric double pipe, and the double plunger oil pump are connected to form two flow channels, one inside and one outside.

[0004] The aforementioned patent addresses the problems of high initial investment costs, complex system structure, low stability, and complex on-site operation associated with currently used submersible direct-drive screw pumps, submersible linear motor rodless oil extraction, and water-based hydraulic rodless oil extraction technologies. However, some shortcomings still exist and require improvement. Specifically, the lack of a corresponding flow-regulating device for effective control during the process of liquid entering the pump body from the screen tube leads to large fluctuations in flow rate, accompanied by pressure shock phenomena. These adverse factors can cause potential damage to the pump body, affecting the overall performance and service life of the system. Utility Model Content

[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a downhole pump body structure for a hydraulic rodless drainage system to solve the problems mentioned in the background art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A downhole pump body structure for a hydraulic rodless pumping system includes a casing, a piston rod movably connected to the upper side of the casing, a fixed plunger for an oil pump movably connected to the lower side of the casing, mounting frames connected to both sides of the casing, a fixing component between the mounting frame and the casing, a filter screen plate installed inside the mounting frame, an adjustment component on one side of the mounting frame, the filter screen plate being slidably connected to the mounting frame via the adjustment component, and a flow-regulating component located on one side of the filter screen plate inside the mounting frame.

[0008] The flow-slowing assembly includes a first flow-slowing plate, which is installed in the mounting frame on the side near the filter screen. A second flow-slowing plate is installed in the mounting frame on the side of the first flow-slowing plate, and a diffuser is installed in the mounting frame on the side of the second flow-slowing plate.

[0009] As a preferred technical solution, the first flow-retarding plate and the second flow-retarding plate are inclined and are alternately arranged, and a flow-retarding groove is provided on one side of both the first flow-retarding plate and the second flow-retarding plate.

[0010] As a preferred technical solution, a first connecting block is fixedly connected to both sides of the sleeve, and a second connecting block is fixedly connected to both sides of the mounting frame. A fixing component is disposed between the first connecting block and the second connecting block. The fixing component includes a mating block, which is fixedly connected to one side of the first connecting block. A mating groove is provided on one side of the second connecting block, and the mating block is movably connected to the mating groove. A positioning groove is provided inside the mating block, and a positioning clamp is movably connected inside the positioning groove. The positioning clamp is slidably connected inside the second connecting block. A first motor is fixedly connected to the top of the second connecting block, and a first screw is fixedly connected to the output end of the first motor. The first screw is rotatably connected inside the second connecting block, and one side of the positioning clamp is threadedly connected to the first screw.

[0011] As a preferred technical solution, the adjustment assembly includes a guide frame, which is fixedly connected to both sides of the mounting frame. A second motor is fixedly connected to one side of the guide frame, and a second screw is fixedly connected to the output end of the second motor. The second screw is rotatably connected to the inner side of the guide frame, and a transmission plate is threadedly connected to the outer surface of the second screw. One side of the transmission plate is slidably connected to the guide frame, and the other side of the transmission plate is mounted on a filter screen. A mounting block is fixedly connected to one side of the filter screen, and one side of the transmission plate is fixedly connected to the mounting block by screws.

[0012] In summary, the present invention has the following main advantages:

[0013] First, this utility model solves the problems of large flow rate fluctuations and pressure shocks that damage the pump body during the process of liquid entering the pump body from the screen tube. It improves the overall performance and service life of the system. By fixing and installing frames on both sides of the sleeve, and installing filter screens inside the frames to filter impurities and initially reduce the flow rate, the liquid passes through the first and second flow-slowing plates. Flow-slowing grooves are opened on the first and second flow-slowing plates to guide the flow direction of the liquid, so that it can be evenly dispersed and the flow rate can be slowed down. Then the liquid passes through the diffuser to further slow down the flow rate of the liquid and smoothly introduce it into the pump body. This solves the problems of large flow rate fluctuations and pressure shocks that damage the pump body during the process of liquid entering the pump body from the screen tube.

[0014] Secondly, this utility model allows the mounting frame to be disassembled by installing a fixing component on the pump body structure, facilitating the maintenance of the internal components. The adjustment component allows the filter screen to extend out of the mounting frame, making it easy to disassemble and replace the filter screen, thus improving the convenience of maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the inner bottom side structure of the sleeve of this utility model;

[0017] Figure 3 This is a schematic diagram of the fixing component and the adjusting component of this utility model;

[0018] Figure 4 This is a cross-sectional view of the mounting frame of this utility model.

[0019] Reference numerals: 1. Sleeve; 2. Piston rod; 3. Oil pump fixed plunger; 4. Mounting frame; 5. Filter screen; 6. Flow retardant assembly; 61. First flow retardant plate; 62. Second flow retardant plate; 63. Flow retardant groove; 64. Diffuser; 7. First connecting block; 8. Second connecting block; 9. Fixing assembly; 91. Connecting block; 92. Connecting groove; 93. Positioning clamp; 94. Positioning groove; 95. First screw; 96. First motor; 10. Adjustment assembly; 101. Guide frame; 102. Second motor; 103. Second screw; 104. Transmission plate; 105. Mounting block. Detailed Implementation

[0020] Example

[0021] refer to Figures 1 to 4This embodiment describes a downhole pump structure for a hydraulic rodless production system, including a casing 1. A piston rod 2 is movably connected to the upper side of the casing 1, and a pumping pump fixed plunger 3 is movably connected to the lower side of the casing 1. The casing 1 structure adopts the casing 1 structure in a rodless production tubing string for a pumping well, as disclosed in CN201721204438.7, which is prior art and will not be repeated here. Mounting frames 4 are connected to both sides of the casing 1. It should be noted that a sealing gasket is provided between the casing 1 and the mounting frame 4 to prevent liquid leakage from the connection. A fixing component 9 is provided between the mounting frame 4 and the casing 1. A filter screen 5 is installed inside the mounting frame 4 to filter impurities in the downhole fluid, reducing the entry of these impurities into the pump body and causing wear or blockage. An adjustment component 10 is provided on one side of the mounting frame 4, and the filter screen 5 is connected to the mounting frame via the adjustment component 10. 4. A sliding connection is provided. A flow-slowing component 6 is provided on one side of the filter screen plate 5 within the mounting frame 4. The flow-slowing component 6 includes a first flow-slowing plate 61, which is installed on the side of the mounting frame 4 near the filter screen plate 5. A second flow-slowing plate 62 is installed on the side of the first flow-slowing plate 61 within the mounting frame 4. A diffuser 64 is installed on the side of the second flow-slowing plate 62 within the mounting frame 4. The first flow-slowing plate 61 and the second flow-slowing plate 62 are inclined and are alternately arranged. A flow-slowing groove 63 is provided on one side of both the first flow-slowing plate 61 and the second flow-slowing plate 62. The first flow-slowing plate 61 and the second flow-slowing plate 62 cooperate with each other to form a double flow-slowing effect, which allows the liquid to be fully dispersed during the flow process, further slowing down the flow rate. After being processed by the diffuser 64, the liquid can enter the pump body more smoothly after the flow-slowing treatment.

[0022] refer to Figure 3The sleeve 1 is fixedly connected to both sides with first connecting blocks 7, and the mounting frame 4 is fixedly connected to both sides with second connecting blocks 8. A fixing component 9 is disposed between the first connecting blocks 7 and the second connecting blocks 8. The fixing component 9 includes a mating block 91, which is fixedly connected to one side of the first connecting block 7. A mating groove 92 is provided on one side of the second connecting block 8, and the mating block 91 is movably connected to the mating groove 92. A positioning groove 94 is provided inside the mating block 91, and a positioning clamp 93 is movably connected inside the positioning groove 94. The positioning clamp 93 is slidably connected inside the second connecting block 8. A first motor 96 is fixedly connected to the top of the second connecting block 8, and the output end of the first motor 96 is fixedly connected to... A first screw 95 is fixedly connected to the first connecting block 8, and the first screw 95 is rotatably connected to the inside of the second connecting block 8. One side of the positioning clamp 93 is threadedly connected to the first screw 95. By setting the first connecting block 7 and the second connecting block 8, the mounting frame 4 can be connected to the sleeve 1. A fixing component 9 is set. When it is necessary to disassemble the mounting frame 4, the first motor 96 drives the first screw 95 to rotate, which drives the positioning clamp 93 on its surface to move, so that the positioning clamp 93 leaves the positioning groove 94. At this time, the connecting block is no longer fixed to the connecting groove, so the first connecting block 7 and the second connecting block 8 can be separated, so as to achieve the purpose of quickly disassembling the mounting frame 4, which is convenient for internal maintenance of the mounting frame 4, and also achieves the purpose of quickly installing the fixing frame, which provides convenience for the disassembly of the mounting frame 4.

[0023] refer to Figure 3 The adjustment assembly 10 includes a guide frame 101, which is fixedly connected to both sides of the mounting frame 4. A second motor 102 is fixedly connected to one side of the guide frame 101, and a second screw 103 is fixedly connected to the output end of the second motor 102. The second screw 103 is rotatably connected to the inner side of the guide frame 101, and a transmission plate 104 is threadedly connected to the outer surface of the second screw 103. One side of the transmission plate 104 is slidably connected to the guide frame 101, and the other side of the transmission plate 104 is mounted on the filter screen plate 5. A mounting block 105 is fixedly connected, and one side of the transmission plate 104 is fixedly connected to the mounting block 105 by screws. By setting the adjustment component 10, when it is necessary for the filter screen plate 5 to extend out of the mounting frame 4, the second motor 102 drives the second screw 103 to rotate on the guide frame 101. At this time, the transmission plate 104 on the surface of the second screw 103 is subjected to force and slides, so that the transmission plate 104 drives the mounting block 105 to move. The mounting block 105 drives the filter screen plate 5 to extend out of the mounting frame 4, which facilitates the disassembly of the filter screen plate 5 without having to enter the mounting frame 4 to disassemble the filter screen plate 5.

[0024] Operating principle and advantages: The mounting frame 4 is connected to both sides of the casing 1 via the first connecting block 7 and the second connecting block 8. The first motor 96 drives the first screw 95 to rotate, causing the positioning clamp 93 to enter the positioning groove 94, thus firmly fixing the mounting frame 4 to the casing 1. After the pump body starts working, the downhole fluid flows into the mounting frame 4 through the casing 1. First, it passes through the filter screen 5 to filter impurities, reducing the risk of impurities entering the pump body. The filtered fluid then flows through the first flow-slowing plate 61 and the second flow-slowing plate 62. The flow-slowing grooves 63 on these two flow-slowing plates guide the fluid to be evenly dispersed, forming a double flow-slowing effect, effectively slowing down the flow rate. Finally, the fluid passes through the diffuser 64 to further slow down the flow rate and is smoothly introduced into the pump body. By slowing down the flow rate and evenly dispersing the fluid... The flow stabilizing device ensures that the liquid enters the pump body smoothly, improving the pump's suction efficiency and operational stability. It can effectively achieve liquid filtration and smooth suction, improving the working efficiency and reliability of the hydraulic rodless pumping system. When maintenance is required on the internal structure of the mounting frame 4, the first screw 95 is driven to rotate in reverse by the first motor 96, causing the positioning clamp 93 to leave the positioning groove 94, thus releasing the fixed connection between the mounting frame 4 and the sleeve 1. The mounting frame 4 can then be easily disassembled to maintain internal components such as the filter screen 5 and the flow buffer plate. If the filter screen 5 needs to be replaced, the second screw 103 can be driven to rotate by the second motor 102, causing the transmission plate 104 to drive the mounting block 105 and the filter screen 5 to extend out of the mounting frame 4 for easy disassembly and replacement.

Claims

1. A downhole pump body structure for a hydraulic rodless pumping system, comprising a casing (1), characterized in that: A piston rod (2) is movably connected to the upper side of the sleeve (1), and a fixed plunger (3) for an oil pump is movably connected to the lower side of the sleeve (1). Mounting frames (4) are connected to both sides of the sleeve (1). A fixing component (9) is provided between the mounting frame (4) and the sleeve (1). A filter screen plate (5) is installed inside the mounting frame (4). An adjustment component (10) is provided on one side of the mounting frame (4). The filter screen plate (5) is slidably connected to the mounting frame (4) through the adjustment component (10). A flow-slowing component (6) is provided inside the mounting frame (4) on one side of the filter screen plate (5). The flow-slowing assembly (6) includes a first flow-slowing plate (61), which is installed in the mounting frame (4) on the side close to the filter screen (5). A second flow-slowing plate (62) is installed in the mounting frame (4) on the side of the first flow-slowing plate (61), and a diffuser (64) is installed in the mounting frame (4) on the side of the second flow-slowing plate (62).

2. The downhole pump body structure for a hydraulic rodless drainage system according to claim 1, characterized in that: The first flow-retarding plate (61) and the second flow-retarding plate (62) are inclined and are alternately arranged. A flow-retarding groove (63) is provided on one side of both the first flow-retarding plate (61) and the second flow-retarding plate (62).

3. The downhole pump body structure for a hydraulic rodless drainage system according to claim 1, characterized in that: The sleeve (1) is fixedly connected to both sides by a first connecting block (7), the mounting frame (4) is fixedly connected to both sides by a second connecting block (8), and the fixing component (9) is located between the first connecting block (7) and the second connecting block (8).

4. The downhole pump body structure for a hydraulic rodless drainage system according to claim 3, characterized in that: The fixing component (9) includes a docking block (91), which is fixedly connected to one side of the first connecting block (7). A docking groove (92) is provided on one side of the second connecting block (8). The docking block (91) is movably connected to the docking groove (92). A positioning groove (94) is provided inside the docking block (91). A positioning clip (93) is movably connected inside the positioning groove (94). The positioning clip (93) is slidably connected inside the second connecting block (8).

5. The downhole pump body structure for a hydraulic rodless drainage system according to claim 4, characterized in that: The top end of the second connecting block (8) is fixedly connected to a first motor (96), the output end of the first motor (96) is fixedly connected to a first screw (95), and the first screw (95) is rotatably connected inside the second connecting block (8). One side of the positioning clamp (93) is threadedly connected to the first screw (95).

6. The downhole pump body structure for a hydraulic rodless drainage system according to claim 1, characterized in that: The adjustment assembly (10) includes a guide frame (101), which is fixedly connected to both sides of the mounting frame (4). A second motor (102) is fixedly connected to one side of the guide frame (101), and a second screw (103) is fixedly connected to the output end of the second motor (102). The second screw (103) is rotatably connected to the inner side of the guide frame (101), and a transmission plate (104) is threadedly connected to the outer surface of the second screw (103). One side of the transmission plate (104) is slidably connected to the guide frame (101), and the other side of the transmission plate (104) is mounted on the filter screen plate (5).

7. The downhole pump body structure for a hydraulic rodless drainage system according to claim 6, characterized in that: A mounting block (105) is fixedly connected to one side of the filter screen (5), and one side of the transmission plate (104) is fixedly connected to the mounting block (105) by screws.

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