Wellhead high-pressure fine filter in oil water injection exploitation

Abstract

The utility model relates to the technical field of oil water injection exploitation, and provides a wellhead high-pressure fine filter in oil water injection exploitation, which comprises a filter box, a box cover is detachably connected to the filter box, a water inlet pipe is communicated to the box cover, a drain pipe is communicated to the bottom of the filter box, and the drain pipe is connected with a water injection pipe through a flange; two fixing plates are fixedly connected to the lower end face of the box cover and attached to the inner wall of the filter box in a sliding mode, a plurality of mounting plates are fixedly connected to the fixing plates at equal intervals in the vertical direction, at least two springs are fixedly connected to each mounting plate, the free ends of the springs on the same horizontal plane are fixedly connected with a mounting frame, and a filter screen is fixedly connected into the mounting frame. According to the utility model, after the filter screen is blocked, the blocked filter screen can be dredged without dismounting the filter screen, so that the influence on the working efficiency is avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil water injection technology, and more specifically, to a high-pressure fine filter at the wellhead in oil water injection. Background Technology

[0002] Currently, during the water injection development process in various oilfields, various impurities such as sedimentation, welding slag, corrosion and scale in the pipeline, suspended solids, mechanical impurities, and solid particles in the injected high-pressure water can easily enter the wellbore, causing blockage and preventing normal water injection. Generally, wellhead filters need to be installed in water injection wells to filter the injected water.

[0003] Patent document CN219061601U discloses a high-pressure fine filter for wellheads in oil well water injection, including a connecting pipe for water injection, a mounting cover, and a filter media assembly. The filter media assembly is fixedly connected to the bottom of the top cover and is movably inserted into the central hole of the connecting pipe in a vertical direction. The filter media assembly includes two or more vertically distributed annular mounting frames, each containing a filter screen. The mesh size of the filter screen installed in the upper annular mounting frame of adjacent annular mounting frames is smaller than that installed in the lower annular mounting frame. The outer sleeve of the mounting cover is provided with a locking tongue device, and the connecting pipe is provided with a locking groove. This invention facilitates the quick removal and cleaning of the coarse and fine filter screens and the filtered material, simplifying subsequent cleaning work. It also allows for quick and easy installation and fixing of the coarse and fine filter screens after cleaning, improving disassembly and cleaning efficiency and meeting usage requirements.

[0004] However, if the filter screen of a filter in the existing technology becomes clogged, the filter media assembly can only be removed for cleaning, which affects work efficiency. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a high-pressure fine filter at the wellhead for oil water injection, which can unclog the filter without removing it after it becomes clogged, thereby avoiding affecting work efficiency.

[0006] A high-pressure fine filter for wellhead in oil water injection includes a filter box with a detachable cover. A water inlet pipe is connected to the cover, and a drain pipe is connected to the bottom of the filter box via a flange. Two fixing plates are fixed to the lower end face of the cover, slidingly against the inner wall of the filter box. Multiple mounting plates are fixed at equal intervals along the vertical direction on the fixing plates. At least two springs are fixed to the mounting plates, with the free ends of the springs on the same horizontal plane fixed to mounting frames. A filter screen is fixed inside the mounting frames. A movable frame passes through and slides on the cover, passing through and fixed to each of the mounting frames.

[0007] Furthermore, a transparent observation plate is installed on the side wall of the filter box.

[0008] Furthermore, the transparent observation plate is made of polytetrafluoroethylene material.

[0009] Furthermore, a baffle is fixedly connected to the mounting plate, and the baffle passes through and slides on the mounting frame.

[0010] Furthermore, the lower end face of the cover is provided with a slot adapted to the cross-section of the filter box.

[0011] Furthermore, the mesh size of each filter screen decreases from top to bottom.

[0012] Furthermore, the mesh diameter of the filter located at the bottom is 1 mm.

[0013] Furthermore, a handle is fixedly attached to the outer wall of the box lid.

[0014] Furthermore, the upper end of the mobile frame is configured as a bent shape.

[0015] Furthermore, the spring is made of 304 stainless steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In this invention, when a filter blockage is detected through the transparent observation plate, water injection is paused. Simply pull the movable frame upwards, and each mounting frame will move upwards, stretching the springs. Then, release the mounting frames; the springs, due to their restorative properties, quickly pull the frames back to their original positions. During this repeated extension and contraction of the springs, the mounting frames cause the filter to vibrate up and down, using inertia to eject foreign objects blocking the filter, thus clearing the blockage. If a single pull of the movable frame is insufficient to clear the filter, the mounting frames can be pulled multiple times to achieve the same effect. This eliminates the need to disassemble the filter, effectively avoiding any impact on work efficiency. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a high-pressure fine filter at the wellhead during oil water injection extraction.

[0020] Figure 2 This is a schematic diagram of the internal structure of the filter box;

[0021] Figure 3This is a schematic diagram showing the breakdown of a high-pressure fine filter at the wellhead during oil water injection extraction.

[0022] Figure 4 This is a partial structural diagram of a high-pressure fine filter at the wellhead used in oil water injection extraction.

[0023] In the diagram: 1. Filter box; 2. Box cover; 3. Inlet pipe; 4. Drain pipe; 5. Water injection pipe; 6. Fixing plate; 7. Mounting plate; 8. Spring; 9. Mounting frame; 10. Filter screen; 11. Moving frame; 12. Transparent observation plate; 13. First bolt; 14. Slot; 15. Baffle; 16. Handle. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Specific implementation examples:

[0026] like Figure 1-4As shown, a high-pressure fine filter for wellhead in oil water injection includes a filter box 1, a detachable cover 2 connected to the filter box 1, an inlet pipe 3 connected to the cover 2, and the inlet pipe 3 connected to the drain end of an external high-pressure water pump via a flange. A drain pipe 4 is connected to the bottom of the filter box 1, and the drain pipe 4 is connected to an injection pipe 5 via a flange. The injection pipe 5 is used to inject water into the well. Two parallel fixing plates 6 are fixedly connected to the lower end face of the cover 2. The sides of the two fixing plates 6 that are far apart from each other slide against the inner wall of the filter box 1. Multiple mounting plates 7 are fixedly connected at equal intervals along the vertical direction on the sides of the two fixing plates 6 that are close to each other. In this embodiment, there are three mounting plates 7 on a single fixed plate 6. At least two springs 8 are fixedly connected to the mounting plate 7 along its length. The free ends of the springs 8 on the same horizontal plane are fixedly connected to the mounting frame 9. A filter screen 10 is fixedly connected inside the opening of the mounting frame 9. The side wall of the mounting frame 9 slides between the two fixed plates 6 and the inner wall of the filter box 1. A movable frame 11 passes through and slides on the box cover 2. The movable frame 11 passes through and is fixedly connected to each mounting frame 9. A transparent observation plate 12 is installed on the side wall of the filter box 1 to observe the water flow through the filter screen 10 inside the filter box 1. If the filter screen 10 is found to be clogged through the transparent observation plate 12, stop water injection (turn off the external high-pressure water pump), pull the moving frame 11 upward to move each mounting frame 9 upward and stretch the spring 8, then release the mounting frame 9, and pull the mounting frame 9 back by the spring 8 restoring its deformation. Under the repeated extension and contraction of the spring 8, the mounting frame 9 and the filter screen 10 shake up and down, and the inertia will pop out and clear the blockage on the filter screen 10. There is no need to remove the filter screen 10 for cleaning, thus avoiding affecting work efficiency.

[0027] like Figure 1-4 As shown, the cover 2 is detachably connected to the filter box 1 by the first bolt 13. The lower end face of the cover 2 has a recessed slot 14. The opening of the slot 14 is adapted to the cross-section of the filter box 1. After the cover 2 is placed on the filter box 1, the upper end of the filter box 1 is inserted into the slot 14. A rubber sealing strip (a conventional technical means, not shown in the figure) is fixedly connected in the slot 14 to improve the sealing effect of the filter box 1.

[0028] like Figure 1-4 As shown, the mesh size of each filter 10 decreases from top to bottom, so that each filter 10 can filter foreign objects of different sizes, thereby relieving the filtration pressure of a single filter 10. The mesh diameter of the bottommost filter is 1mm.

[0029] like Figure 1-4As shown, two springs 8 are fixedly connected to a single mounting plate 7. A baffle 15 is fixedly connected to the mounting plate 7 on the water-facing side of the spring 8. The baffle 15 is used to block splashed water and reduce the probability of water splashing onto the surface of the spring 8, thereby helping to improve the service life of the spring 8. The upper end of the baffle 15 passes through and slides on the mounting frame 9. This can prevent the upper end of the baffle 15 from repeatedly hitting the mounting frame 9 during the repeated extension and retraction of the spring 8.

[0030] like Figure 1-4 As shown, a handle 16 is fixedly connected to the outer wall of the box cover 2. The handle 16 and gripping the handle 16 help to disassemble and install the box cover 2.

[0031] like Figure 1-4 As shown, the upper end of the movable frame 11 (the end located above the cover 2) is bent, which helps to pull it while preventing the upper end of the movable frame 11 from retracting into the filter box 1.

[0032] The transparent observation panel 12 is made of polytetrafluoroethylene (PTFE), which not only has excellent corrosion resistance but also a certain degree of transparency. The spring 8 is made of 304 stainless steel, which not only has good rust resistance but also excellent corrosion resistance, allowing it to be used stably for extended periods in moisture-rich environments.

[0033] The working principle of a high-pressure fine filter at the wellhead in oil water injection in this embodiment is as follows: When a blockage is detected in the filter screen 10 through the transparent observation plate 12, water injection is paused. Simply pull the movable frame 11 upwards, and each mounting frame 9 will move upwards accordingly, thereby stretching the spring 8. Subsequently, the mounting frames 9 are released, and the spring 8, by virtue of its own deformation recovery property, quickly pulls the mounting frames 9 back to their original positions. During the repeated extension and retraction of spring 8, mounting frame 9 causes filter screen 10 to shake up and down, using inertia to eject foreign objects blocking filter screen 10, thus clearing filter screen 10. If a single pull of moving frame 11 cannot clear filter screen 10, mounting frame 9 can be pulled multiple times to achieve the above effect without disassembling filter screen 10, effectively avoiding any impact on work efficiency. After water filling is completed, the external high-pressure water pump is removed, the first bolt 13 is removed, the box cover 2 is removed, and the filter media assembly consisting of fixing plate 6, mounting plate 7, spring 8, mounting frame 9, filter screen 10, and moving frame 11 is removed from the filter box 1. This allows for the cleaning of foreign objects blocking filter screen 10, facilitating the next use.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-pressure fine filter at the wellhead for oil water injection, characterized in that: The filter box (1) is detachably connected to a cover (2), and a water inlet pipe (3) is connected to the cover (2). A drain pipe (4) is connected to the bottom of the filter box (1), and the drain pipe (4) is connected to a water inlet pipe (5) through a flange. Two fixing plates (6) are fixed to the lower end face of the cover (2). The fixing plates (6) slide against the inner wall of the filter box (1). Multiple mounting plates (7) are fixed at equal intervals along the vertical direction on the fixing plates (6). At least two springs (8) are fixed to the mounting plates (7). The free ends of the springs (8) on the same horizontal plane are fixed to the mounting frames (9). A filter screen (10) is fixed inside the mounting frames (9). A movable frame (11) passes through and slides on the cover (2). The movable frame (11) passes through and is fixed to each of the mounting frames (9).

2. The high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: A transparent observation plate (12) is installed on the side wall of the filter box (1).

3. A high-pressure fine filter at the wellhead for oil water injection as described in claim 2, characterized in that: The transparent observation plate (12) is made of polytetrafluoroethylene.

4. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: A baffle (15) is fixedly connected to the mounting plate (7), and the baffle (15) passes through and slides on the mounting frame (9).

5. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: The lower end face of the cover (2) is provided with a slot (14) that is adapted to the cross-section of the filter box (1).

6. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: The mesh size of each filter (10) decreases from top to bottom.

7. A high-pressure fine filter at the wellhead for oil water injection as described in claim 6, characterized in that: The bottommost filter (10) has a mesh diameter of 1 mm.

8. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: A handle (16) is fixed to the outer wall of the box cover (2).

9. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: The upper end of the mobile frame (11) is bent.

10. A high-pressure fine filter at the wellhead for oil water injection as described in claim 1, characterized in that: The spring (8) is made of 304 stainless steel.

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