Underground sand taking device for oil and gas well

Abstract

The utility model relates to an underground sand taking device for an oil-gas well, which belongs to the technical field of oil-gas well cleaning equipment and comprises a concentric oil pipe, a concentric faucet, a high-pressure pump and a jet flow sand washing device, the concentric faucet is connected with a return pipe and a water supply pipe, the water supply pipe is connected with a filter tank, and a partition plate for dividing the filter tank into a settling area and a fine filter area is arranged in the filter tank. Two filter clamping nets and filter cloth are arranged at the upper part of the fine filter area, a conical distribution cone disc is arranged at the upper part of the settling area, and a sunken sand collection settling tank is arranged on the outer side of the distribution cone disc. According to the utility model, fluid enters the sand collection settling tank after being shunted and filtered by the distribution conical disc, large-particle sand blocks are filtered out, then the fluid enters the settling area of the filter tank to be settled and then enters the fine filter area, and the fluid filtered by the filter cloth in the fine filter area enters the water supply pipe, is pressurized by the high-pressure pump and is continuously subjected to jet flow sand washing; the filtering effect of the filtering tank is better, sand mud backflow is better prevented, the sand pumping effect is better prevented, and the high-pressure pump is better protected.

Description

Technical Field

[0001] This utility model relates to a downhole sand extraction device for oil and gas wells, belonging to the technical field of oil and gas well cleaning equipment. Background Technology

[0002] During the development of oil and gas wells, after a period of production, most wells experience severe blockages in perforations, production channels, and production tubing due to the deposition and accumulation of sand, mud, and coal dust at the bottom of horizontal wells. Therefore, it is necessary to extract the sand, mud, and coal dust to clear these blockages. Current sand extraction equipment uses water-jet negative pressure extraction, including concentric tubing, concentric faucets, a high-pressure pump, a jet sand flushing device, and a sedimentation filter. However, the current sedimentation filter only contains baffles and filter screens, which are ineffective at filtering the extracted sand, easily causing sand and mud backflow, affecting the sand extraction efficiency, and potentially damaging the high-pressure pump. Utility Model Content

[0003] This utility model provides a downhole sand extraction device for oil and gas wells, which solves the problem that the current sedimentation and filtration tank only has baffles and filter screens, which have poor filtration effect on the extracted sand, easily cause sand and mud backflow, affect the sand extraction effect, and easily damage the high-pressure pump.

[0004] This utility model relates to a downhole sand removal device for oil and gas wells, including a concentric tubing, a concentric swivel, a high-pressure pump, and a jet sand flushing device. The concentric swivel is connected to a return pipe and a water supply pipe. The water supply pipe is connected to a filter tank. The high-pressure pump is installed on the water supply pipe. The filter tank is equipped with a partition that divides it into a sedimentation zone and a fine filtration zone. The water supply pipe connects to the lower part of the fine filtration zone. The upper part of the partition is equipped with a water inlet. The upper part of the fine filtration zone is equipped with two filter screens with a filter cloth between them. The upper part of the sedimentation zone is equipped with a conical distribution cone. The outer side of the distribution cone is equipped with a sunken sand collection trough. The top of the filter tank in the sedimentation zone is equipped with a cover plate. The top of the outer wall of the sand collection trough is fixed to the cover plate. Filter holes are provided on both the distribution cone and the side wall of the sand collection trough. The outlet end of the return pipe is equipped with a downward-facing elbow with the bottom of the elbow facing the middle of the distribution cone.

[0005] As a preferred embodiment, the left side wall and the front and rear side walls of the cover plate are provided with limiting flanges that are supported on the top outer side wall of the filter tank, which can better limit the cover plate.

[0006] As a preferred embodiment, a baffle plate is provided on the right side of the sand collection trough. The front and rear side walls of the baffle plate are fixed to the front and rear inner walls of the filter tank. The top of the baffle plate is flush with the top of the filter tank, and the bottom of the baffle plate is spaced from the bottom of the filter tank. The baffle plate can support the bottom right end of the cover plate and prevents the fluid entering the sedimentation zone from directly entering the water inlet, thus facilitating better sedimentation.

[0007] As a preferred embodiment, an upper clamping plate and a lower clamping plate are fixed to the outer sides of the two filter clips respectively. The upper clamping plate has a pressing recess on the top outer side and a pressing protrusion on the bottom outer side of the upper clamping plate to press the outer edge of the filter cloth into the pressing recess, which can better clamp the filter cloth.

[0008] As a preferred embodiment, an installation hole is provided between the two filter clips, and a pull rod is provided in the installation hole. The bottom of the lower filter clip is provided with a limit nut threaded onto the pull rod. A support platform is provided on the outer side wall of the lower part of the pull rod to support the upper filter clip, making it convenient to remove the filter clip and filter cloth for replacement or cleaning.

[0009] As a preferred embodiment, a cover plate 2 is fixed to the top of the pull rod. The right side wall and front and rear side walls of the cover plate 2 are provided with limiting flanges 2 that are supported on the top outer side wall of the filter tank. A sealing recess is provided on the outer side wall of the lower clamping frame plate, and a sealing gasket is provided in the sealing groove to prevent fine sand from entering the fine filtration zone below the lower clamping frame plate.

[0010] As a preferred embodiment, the elbow of the return pipe is provided with a section of corrugated pipe, and a connecting ring is fixed on the outer bottom of the elbow. The connecting ring is provided with a connecting hole, and a fixing pin is provided in the connecting hole. The cover plate is provided with a fixing hole that is interference-fitted with the fixing pin, so that the lower part of the elbow can be easily connected to the cover plate, and the elbow does not hinder the disassembly and removal of the cover plate and the sand collection trough.

[0011] As a preferred option, the bottom left and right sides of the filter tank are equipped with drain pipes that connect the sedimentation zone and the fine filtration zone respectively, which facilitates liquid drainage.

[0012] This utility model has the following beneficial effects:

[0013] The fluid drawn up by the jet sand flushing device, concentric oil pipe, and concentric water tap can be sprayed from the bottom of the return pipe toward the center of the distribution cone. After being diverted and filtered by the distribution cone, it enters the sand collection trough, where larger sand particles are filtered out. Then, the fluid enters the sedimentation zone of the filter tank for sedimentation. The overflow liquid and fine sand then enter the fine filtration zone through the water inlet. After being filtered by the filter cloth in the fine filtration zone, the liquid enters the water supply pipe and is pressurized by the high-pressure pump to continue jet sand flushing. This results in better filtration of the filter tank, better prevention of sand and mud backflow that would affect the sand extraction effect, and better protection of the high-pressure pump. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. disclosed in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 for Figure 1 Partial structural diagram Figure 1 ;

[0018] Figure 3 for Figure 1 Partial structural diagram Figure 2 ;

[0019] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0020] In the diagram: 1. Jet sand flushing device; 2. Concentric oil pipe; 3. Water supply pipe; 4. Concentric faucet; 5. Return pipe; 6. High-pressure pump; 7. Filter tank; 8. Tie rod; 9. Cover plate two; 10. Partition plate; 11. Corrugated pipe; 12. Cover plate one; 13. Distribution cone; 14. Baffle plate; 15. Drain pipe; 16. Sand collection trough; 17. Fixing pin; 18. Filter hole; 19. Water inlet; 20. Filter screen; 21. Pressing boss; 22. Filter cloth; 23. Lower clamping frame plate; 24. Upper clamping frame plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0022] Example 1, such as Figures 1 to 4As shown, this utility model is a downhole sand removal device for oil and gas wells, including a concentric tubing 2, a concentric swivel 4, a high-pressure pump 6, and a jet sand flushing device 1. The jet sand flushing device 1 is existing technology and will not be described in detail here. The concentric swivel 4 is connected to a return pipe 5 and a water supply pipe 3. The water supply pipe 3 is connected to a filter tank 7. The high-pressure pump 6 is installed on the water supply pipe 3. The filter tank 7 is equipped with a partition 10 that divides it into a sedimentation zone and a fine filtration zone. The water supply pipe 3 connects to the lower part of the fine filtration zone. The upper part of the partition 10 is equipped with a water inlet 19. The upper part of the fine filtration zone is equipped with... Two filter screens 20 are provided, with filter cloth 22 between them. A cone-shaped distribution cone 13 is provided at the top of the sedimentation zone. A sunken sand collection trough 16 is provided on the outside of the distribution cone 13. A cover plate 12 is provided on the top of the filter tank 7 in the sedimentation zone. The top of the outer wall of the sand collection trough 16 is detachably fixed to the cover plate 12 by bolts. Filter holes 18 are provided on both the distribution cone 13 and the side wall of the sand collection trough 16. The outlet end of the return pipe 5 is provided with a downward elbow, with the bottom of the elbow facing the middle of the distribution cone 13.

[0023] In use, the high-pressure pump 6 on the ground draws the flushing fluid from the lower part of the fine filtration zone of the filter pool 7 and flows it down the concentric annulus of the concentric oil pipe 2 into the high-pressure chamber of the jet flushing device 1. A small portion of the flushing fluid is sprayed out from the jet nozzle, and most of the flushing fluid is sprayed out from the sand extraction nozzle, which reduces the pressure around the jet and forms a negative pressure zone. The sand stirred up by the jet nozzle and the high-speed sand extraction fluid are sucked into the throat pipe together. The mixed sand-carrying fluid returns to the ground along the inner hole of the concentric oil pipe 2, and then is discharged into the distribution cone 13 from the return pipe 5. After being distributed and filtered by the distribution cone 13, it enters the sand collection trough 16. After being filtered by the sand collection trough 16, large sand particles are filtered out. Then the fluid enters the sedimentation zone of the filter pool 7 and settles. After being filtered by the water inlet 19, it enters the fine filtration zone. After being filtered by the filter cloth 22 in the fine filtration zone, the flushing fluid falls to the lower part of the fine filtration zone and is then drawn out by the high-pressure pump 6 for recycling.

[0024] In Example 2, based on Example 1, the left and front and rear side walls of the cover plate 12 are provided with limiting flanges that are supported on the top outer wall of the filter tank 7. The limiting flanges are interference-fitted with the top outer wall of the filter tank 7.

[0025] A baffle plate 14 is provided on the right side of the sand settling tank 16. The front and rear side walls of the baffle plate 14 are fixed to the front and rear inner walls of the filter tank 7. The top of the baffle plate 14 is flush with the top of the filter tank 7, and the bottom of the baffle plate 14 is spaced from the bottom of the filter tank 7. The liquid and fine sand falling from the sand settling tank 16 and the distribution cone 13 first settle downwards, and then the liquid and some fine sand enter the water inlet 19 through the gap between the bottom of the baffle plate 14 and the bottom of the filter tank 7.

[0026] The outer sides of the two filter clips 20 are respectively fixed with an upper clip plate 24 and a lower clip plate 23. The upper outer side of the lower clip plate 23 is provided with a pressing recess, and the lower outer side of the upper clip plate 24 is provided with a pressing protrusion 21 that presses the outer edge of the filter cloth 22 into the pressing recess.

[0027] A mounting hole is provided in the middle of the two filter clips 20, and a pull rod 8 is provided in the mounting hole. The bottom of the lower filter clip 20 is provided with a limit nut threaded onto the pull rod 8. A support platform for supporting the upper filter clip 20 is provided on the outer side wall of the lower part of the pull rod 8.

[0028] A cover plate 2 9 is fixed to the top of the pull rod 8. The right side wall and front and rear side walls of the cover plate 2 9 are equipped with limiting flanges 2 that support the top outer wall of the filter tank 7. A sealing recess is provided on the outer wall of the lower clamping frame plate 23, and a sealing gasket is placed inside the sealing recess. When removing the filter cloth 22 for cleaning, pull the cover plate 2 9 upwards, causing the pull rod 8 to lift the upper clamping frame plate 24 and the lower clamping frame plate 23 out of the fine filtration area. Then, unscrew the limiting nut, and remove the filter screen 20 and filter cloth 22 for cleaning or replacement.

[0029] A section of corrugated pipe 11 is provided at the bend of the return pipe 5. A connecting ring is fixed to the outer bottom of the bend, and a connecting hole is provided on the connecting ring. A fixing pin 17 is provided in the connecting hole. A fixing hole with an interference fit is provided on the cover plate 12. When removing the sand collection trough 16 for cleaning, first pull out the fixing pin 17, then compress the corrugated pipe 11 upwards, so that the lower part of the bend retracts upwards. Then the cover plate 12 can be removed. Then the bolts fixing the sand collection trough 16 are unscrewed, the sand collection trough 16 is removed, and the sand collection trough 16 can be cleaned.

[0030] The bottom left and right sides of the filter tank 7 are provided with drain pipes 15 that connect the sedimentation zone and the fine filtration zone respectively.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0032] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A downhole sand removal device for oil and gas wells, comprising a concentric tubing (2), a concentric swivel (4), a high-pressure pump (6), and a jet sand flushing device (1), wherein the concentric swivel (4) is connected to a return pipe (5) and a water supply pipe (3), the water supply pipe (3) is connected to a filter tank (7), and the high-pressure pump (6) is mounted on the water supply pipe (3), characterized in that: The filter tank (7) is equipped with a partition (10) that divides it into a sedimentation zone and a fine filtration zone. The water supply pipe (3) is connected to the lower part of the fine filtration zone. The upper part of the partition (10) is equipped with a water inlet (19). The upper part of the fine filtration zone is equipped with two filter screens (20). The filter cloth (22) is provided between the two filter screens (20). The upper part of the sedimentation zone is equipped with a cone-shaped distribution cone (13). The outer side of the distribution cone (13) is equipped with a sunken sand collection trough (16). The top of the filter tank (7) in the sedimentation zone is equipped with a cover plate (12). The top of the outer wall of the sand collection trough (16) is fixed on the cover plate (12). The distribution cone (13) and the side wall of the sand collection trough (16) are equipped with filter holes (18). The outlet end of the return pipe (5) is equipped with a downward elbow. The bottom of the elbow faces the middle position of the distribution cone (13).

2. The sand production downhole device for oil and gas wells according to claim 1, characterized in that: The left and front and rear side walls of the cover plate (12) are provided with limiting flanges that are supported on the top outer side wall of the filter tank (7).

3. A sand production downhole device for oil and gas wells according to claim 2, characterized in that: A baffle plate (14) is provided on the right side of the sand collection trough (16). The front and rear side walls of the baffle plate (14) are fixed on the front and rear inner walls of the filter tank (7). The top of the baffle plate (14) is flush with the top of the filter tank (7), and the bottom of the baffle plate (14) is spaced from the bottom of the filter tank (7).

4. The sand production downhole device of claim 1, wherein: The outer sides of the two filter clips (20) are respectively fixed with an upper clip plate (24) and a lower clip plate (23). The upper clip plate (23) has a pressing recess on the top outer side, and the upper clip plate (24) has a pressing protrusion (21) on the bottom outer side to press the outer edge of the filter cloth (22) into the pressing recess.

5. A sand production downhole device for oil and gas wells according to claim 4, characterized in that: A mounting hole is provided in the middle of the two filter clips (20), and a pull rod (8) is provided in the mounting hole. The bottom of the lower filter clip (20) is provided with a limit nut threaded onto the pull rod (8). A support platform for supporting the upper filter clip (20) is provided on the outer side wall of the lower part of the pull rod (8).

6. A sand production downhole device for oil and gas wells according to claim 5, characterized in that: The top of the pull rod (8) is fixed with a cover plate 2 (9). The right side wall and the front and rear side walls of the cover plate 2 (9) are provided with limiting flanges 2 that are supported on the top outer side wall of the filter tank (7). The outer side wall of the lower clamping frame plate (23) is provided with a sealing recess, and a sealing gasket is provided in the sealing groove.

7. The sand production downhole device of claim 1, wherein: A section of corrugated pipe (11) is provided on the elbow of the return pipe (5). A connecting ring is fixed on the outer side of the bottom of the elbow. A connecting hole is provided on the connecting ring. A fixing pin (17) is provided in the connecting hole. A fixing hole that is interference fit with the fixing pin (17) is provided on the cover plate (12).

8. The sand production downhole device of claim 1, wherein: The bottom left and right sides of the filter tank (7) are provided with drain pipes (15) that connect the sedimentation zone and the fine filtration zone respectively.

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