Self-suction foam sand washing device

Abstract

This utility model relates to the field of well sand flushing technology, and in particular to a self-priming foam sand flushing device; it includes a variable coupling, an air inlet connector, an air inlet pipe, a transition connector, an outlet connector, a nozzle, a throat, and a diffuser. One end of the variable coupling is connected to a high-pressure fluid, and the other end is connected to the transition connector. The outer wall of the transition connector is also connected to the variable coupling, and the side wall of the air inlet connector is connected to the air inlet pipe, which is connected to a nitrogen tank. The end of the outer wall of the transition connector away from the air inlet connector is connected to the outlet connector, and the end of the inner wall of the transition connector away from the variable coupling connector is connected to a sealing body. The sealing body is connected to the inner wall of the outlet connector, and a nozzle is installed inside the sealing body. The outlet connector has a throat and a diffuser inside. A nitrogen inlet is provided on the sealing body, and an annular channel is provided inside the side wall of the transition connector. The inside of the air inlet pipe, the annular channel, the nitrogen inlet, and the nozzle's outlet end are connected. The inside of the variable coupling and the inner wall of the transition connector are connected to the inside of the nozzle, thus reducing the density of the flushing fluid.

Description

Technical Field

[0001] This utility model relates to the field of well sand flushing technology, and in particular to a self-priming foam sand flushing device. Background Technology

[0002] Most of the carbonate rock formations in the oilfield are completed in open-hole wells. In the later stages of development, fractured-vuggy reservoirs in carbonate rocks require the use of washing fluid for sand flushing. However, excessive pressure of the washing fluid can cause a certain amount of leakage. To avoid leakage or even well collapse, it is necessary to reduce the density of the washing fluid and the pressure in the open-hole section.

[0003] Conventional well-washing fluids have a high density and produce relatively little hydraulic sand flushing, making them prone to blockage in horizontal well sections. Existing hydraulic well-washing and sand-flushing devices can temporarily clog the flushing agent and contaminate the reservoir during operation, resulting in long operation cycles and high costs. Furthermore, existing foam well-washing fluids formulated with air have low cleanliness and chemical stability, and their high oxygen content poses certain safety hazards.

[0004] Therefore, there is an urgent need to provide a self-priming foam flushing device that reduces the density of the flushing fluid and improves safety compared to existing technologies. Utility Model Content

[0005] This invention addresses the technical problems existing in the prior art by providing a self-priming foam sand flushing device.

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

[0007] A self-priming foam flushing device includes a variable coupling, an air inlet connector, an air inlet pipe, a transition connector, an outlet connector, a nozzle, a sealing body, a throat, and a diffuser. One end of the variable coupling is connected to a high-pressure fluid, and the other end is connected to the transition connector. The air inlet connector is also connected between the outer wall of the transition connector and the variable coupling. The side wall of the air inlet connector is connected to the air inlet pipe, which is connected to a nitrogen tank. The end of the outer wall of the transition connector away from the air inlet connector is connected to the outlet connector. The end of the inner wall of the transition connector away from the variable coupling connector is connected to the sealing body. The sealing body is connected to the inner wall of the outlet connector. A nozzle is provided inside the sealing body. A throat and a diffuser are provided inside the outlet connector. The throat is positioned close to the nozzle relative to the diffuser, and there is a distance between the throat and the nozzle. A nitrogen inlet is provided on the sealing body. There is a gap between the nitrogen inlet and the inner wall of the outlet connector. An annular channel is provided in the side wall of the transition connector. The inside of the air inlet pipe, the annular channel, the nitrogen inlet, and the nozzle's outlet end are connected. The inside of the variable coupling and the inside of the transition connector are connected to the inside of the nozzle.

[0008] Furthermore, the inner wall of the sealed body is connected to a nozzle support tube, and the inner wall of the nozzle support tube is connected to the nozzle.

[0009] Furthermore, the inner wall of the nozzle support tube is also connected to a connecting tube, which is connected to the nozzle, and the inner diameter of the connecting tube is smaller than the inner diameter of the variable coupling.

[0010] Furthermore, the inner wall of the nozzle support tube is also connected to a clamping screw tube, which is used to clamp the connecting tube and the nozzle.

[0011] Furthermore, the inner diameter of the compression screw is larger than the inner diameter of the connecting pipe, but smaller than the inner diameter of the variable thread connector.

[0012] Furthermore, the nitrogen inlet is located at the connection point between the connecting pipe and the nozzle.

[0013] Furthermore, a sealing joint is correspondingly connected to the inner wall of the connection between the sealing body and the outlet joint, and a throat support tube is connected inside the sealing joint. The throat support tube is connected inside the throat tube and the diffuser tube.

[0014] Furthermore, a clamping tube is also connected inside the throat support tube, and the clamping tube is located between the throat tube and the diffuser tube.

[0015] Furthermore, the inner diameter of the throat is smaller than the inner diameter of the diffuser.

[0016] Furthermore, the inner diameter of the compression tube is set to gradually increase from the end near the throat tube to the end near the diffuser tube.

[0017] Furthermore, an adjusting nut is threaded onto the outer wall of the throat support tube, and the adjusting nut is used to tighten the sealing joint and the sealing body.

[0018] Furthermore, the outer wall of the variable thread connector is threaded with a locking nut, and the locking nut is also connected to the transition connector.

[0019] Furthermore, a sealing ring is fitted onto the outer wall of the variable-stretcher connector.

[0020] Furthermore, the sealing ring is connected to the outside of the variable thread connector via a sealing nut.

[0021] Furthermore, the outlet connector is externally connected to a sealing nut.

[0022] Furthermore, sealing rings are provided at the connection points of the variable-fastening connector and the air inlet connector, the connection points of the air inlet connector and the air inlet pipe, the connection points of the air inlet connector and the transition connector, the connection points of the variable-fastening connector and the sealing body, and the connection points of the sealing body and the outlet connector.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This invention works based on the jet principle, has a simple structure, is easy to maintain, and does not require an air pump. It creates a negative pressure zone at the throat of the foamer by means of a high-speed jet, and by opening holes in the wall of the negative pressure zone, it uses natural pressure difference to guide the flame-retardant gas into the pipeline, so as to complete the full mixing of nitrogen and well washing fluid, reduce the density of the flushing fluid and improve the safety of the flushing process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Variable thread connector; 2. Sealing ring; 3. Sealing nut; 4. Inlet connector; 5. Locking nut; 6. Transition connector; 7. Compression screw; 8. Nozzle support tube; 9. Connecting tube; 10. Sealing body; 11. Outlet connector; 12. Nozzle; 13. Throat; 14. Sealing connector; 15. Adjusting nut; 16. Throat support tube; 17. Compression tube; 18. Diffuser tube; 19. Inlet pipe; 20. Annular channel; 21. Nitrogen inlet. Detailed Implementation

[0028] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] like Figure 1As shown, this utility model provides a self-priming foam sand flushing device, including a variable-thread connector 1, an air inlet connector 4, an air inlet pipe 19, a transition connector 6, a compression screw pipe 7, an outlet connector 11, a nozzle 12, a sealing body 10, a throat pipe 13, and a diffuser pipe 18. One end of the variable-thread connector 1 is connected to a high-pressure fluid, and the other end is connected to the air inlet connector 4. The lower side wall of the air inlet connector 4 is connected to the air inlet pipe 19, and the axis of the air inlet pipe 19 is perpendicular to the axis of the air inlet connector 4. The air inlet pipe 19 is threadedly connected to the air inlet connector 4. The end of the air inlet connector 4 away from the connection with the variable-thread connector 1 is connected to the transition connector 6. The side wall of the transition connector 6 is provided with an annular channel 20, and the inner wall of the transition connector 6 is threadedly connected to the variable-thread connector 1. Both ends of the annular channel 20 in the side wall of the transition connector 6 are connected to the outside of the transition connector 6. The end of the transition connector 6 away from the air inlet connector 4 is threadedly connected to the outlet connector 11. The outlet connector 11 and the transition connector 6 are connected... The outer wall of the transition joint 6 is threaded. The end of the inner wall of the transition joint 6 that is away from the connection with the variable thread joint 1 is connected to the sealing body 10. The end of the sealing body 10 that is away from the transition joint 6 is connected to the outlet joint 11. The sealing body 10 is provided with a nitrogen inlet 21. The nozzle 12 is provided inside the sealing body 10. One end of the nozzle 12 is connected to the connection between the sealing body 10 and the transition joint 6. The other end of the nozzle 12 is provided with a throat 13. There is a certain distance between the nozzle 12 and the throat 13. The throat 13 is connected to the sealing body 10. The throat 13 is provided at the connection between the sealing body 10 and the outlet joint 11. The outlet joint 11 is also provided with a diffuser 18. The diffuser 18 is provided at the end of the throat 13 that is away from the nozzle 12. The interior of the air inlet pipe 19 is connected in sequence to the interior of the air inlet joint 4, the annular channel 20 of the transition joint 6, the gap between the outlet joint 11 and the sealing body 10, the nitrogen inlet 21, and the nozzle 12.

[0030] A sealing ring 2 is fitted onto the outer wall of the end of the adapter 1 that connects to the high-pressure fluid. The sealing ring 2 is fixed to the outer wall of the adapter 1 by a sealing nut 3. Sealing rings 2 are also provided at the connection points of the air inlet connector 4 and the adapter 1, the air inlet pipe 19 and the air inlet connector 4, the transition connector 6 and the air inlet connector 4, and the connection points of the inner walls of the adapter 1 and the transition connector 6, to ensure the sealing between the connected parts. A locking nut 5 is threaded onto the outer wall of the adapter 1, and the locking nut 5 connects the transition connector 6 to the adapter 1.

[0031] The inner wall of the sealing body 10 and the inner wall of the transition joint 6 is connected to the nozzle support tube 8. There is a distance between the outer wall of the nozzle support tube 8 and the nitrogen inlet 21 provided in the sealing body 10. The inner wall of the nozzle support tube 8 is connected to the compression screw tube 7, the connecting tube 9 and the nozzle 12 in sequence from the end near the variable joint 1 to the end away from the variable joint 1. One end of the nozzle 12 is set to extend out of the nozzle support tube 8. The end extending out of the nozzle support tube 8 is the spray end of the nozzle 12. The inner diameter of the compression screw tube 7 is larger than the inner diameter of the connecting tube 9. The nitrogen inlet 21 is set to correspond to the connecting tube 9. The compression screw tube 7 is used to compress the connecting tube 9 and the nozzle 12.

[0032] The inner wall of the connection between the sealing body 10 and the outlet connector 11 is connected to the sealing connector 14. The inner wall of the sealing connector 14 is connected to the throat support tube 16. The inner wall of the throat support tube 16 is connected to the throat tube 13 and the compression tube 17 in sequence from the end near the nozzle 12 to the end away from the nozzle 12. The compression tube 17 compresses the throat tube 13 and connects it to the inside of the throat support tube 16. The end of the throat support tube 16 away from the nozzle 12 is connected to the diffuser tube 18. The inner diameter of the diffuser tube 18 is larger than the inner diameter of the throat tube 13. One end of the compression tube 17 is in contact with the throat tube 13 and the other end is in contact with the diffuser tube 18. The inner diameter of the compression tube 17 gradually increases from the end near the throat tube 13 to the end near the diffuser tube 18. The inner diameter of the end of the compression tube 17 near the throat tube 13 is the same as the inner diameter of the throat tube 13. The inner diameter of the end of the compression tube 17 near the diffuser tube 18 is the same as the inner diameter of the diffuser tube 18. The outer wall of the throat support tube 16 is threaded with an adjusting nut 15, which is used to tighten the connection between the sealing joint 14 and the sealing body 10.

[0033] Sealing rings 2 are provided at the connection points of the sealing body 10 and the nozzle support pipe 8, the connection points of the connecting pipe 9 and the nozzle support pipe 8, and the connection points of the throat support pipe 16 and the sealing joint 14 to ensure the sealing between the connected parts. A sealing nut 3 is fitted on the outer wall of the outlet joint 11 corresponding to the diffuser pipe 18 to facilitate connection with other equipment and ensure the sealing of the outlet joint 11 with other equipment.

[0034] The working principle of the self-priming foam sand flushing device provided by this utility model is as follows: The end of the variable coupling 1 away from the air inlet 4 is connected to high-pressure liquid, and the end of the air inlet pipe 19 away from the air inlet 4 is connected to a nitrogen tank. The high-pressure liquid passes through the variable coupling 1, the interior of the transition joint 6, the interior of the compression screw pipe 7, the interior of the connecting pipe 9, and the interior of the nozzle 12 in sequence. When the high-pressure liquid passes through the end face with a reduced diameter, its velocity increases significantly, resulting in a significant reduction in sub-energy. This generates a negative pressure at the spraying end of the nozzle 12, forming a negative pressure zone and generating a suction effect, which draws in nitrogen from the nitrogen tank. The nitrogen passes through the air inlet pipe 19, the gap between the air inlet 4 and the variable coupling 1, the annular channel 20 of the transition joint 6, and the gap between the sealing body 10 and the outlet joint 11 in sequence. Finally, it mixes with the high-pressure liquid sprayed from the spraying end of the nozzle 12 through the nitrogen inlet 21. The high-pressure liquid mixed with nitrogen passes through the throat pipe 13 and the diffuser pipe 18 in sequence and is sprayed out to form foam, which performs sand flushing operation in the well.

[0035] This invention works based on the jet principle, has a simple structure, is easy to maintain, and does not require an air pump. It creates a negative pressure zone at the throat of the foamer by means of a high-speed jet, and by opening holes in the wall of the negative pressure zone, it uses natural pressure difference to guide the flame-retardant gas into the pipeline, so as to complete the full mixing of nitrogen and well washing fluid, reduce the density of the flushing fluid and improve the safety of the flushing process.

[0036] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A self-priming foam sand flushing device, characterized in that, The device includes a variable-tension connector, an inlet connector, an inlet pipe, a transition connector, an outlet connector, a nozzle, a sealing body, a throat, and a diffuser. One end of the variable-tension connector is connected to a high-pressure fluid, and the other end is connected to the transition connector. The outer wall of the transition connector is also connected to the inlet connector. The side wall of the inlet connector is connected to the inlet pipe, which is connected to a nitrogen tank. The end of the outer wall of the transition connector away from the inlet connector is connected to the outlet connector. The end of the inner wall of the transition connector away from the variable-tension connector is connected to the sealing body. The sealing body is connected to the inner wall of the outlet connector. A nozzle is disposed inside the sealing body. A throat and a diffuser are disposed inside the outlet connector. The throat is disposed closer to the nozzle than the diffuser, and there is a distance between the throat and the nozzle. A nitrogen inlet is provided on the sealing body, and there is a gap between the nitrogen inlet and the inner wall of the outlet connector. An annular channel is provided in the side wall of the transition connector. The interior of the inlet pipe, the annular channel, the nitrogen inlet, and the outlet end of the nozzle are connected. The interior of the variable-tension connector and the interior of the inner wall of the transition connector are connected to the interior of the nozzle.

2. The self-priming foam sand flushing device according to claim 1, characterized in that, The inner wall of the sealed body is connected to the nozzle support tube, and the inner wall of the nozzle support tube is connected to the nozzle.

3. The self-priming foam sand flushing device according to claim 2, characterized in that, The inner wall of the nozzle support tube is also connected to a connecting tube, which is connected to the nozzle. The inner diameter of the connecting tube is smaller than the inner diameter of the variable coupling.

4. The self-priming foam sand flushing device according to claim 3, characterized in that, The inner wall of the nozzle support tube is also connected to a clamping screw tube, which is used to clamp the connecting tube and the nozzle.

5. A self-priming foam sand flushing device according to claim 4, characterized in that, The inner diameter of the compression screw is larger than the inner diameter of the connecting pipe, but smaller than the inner diameter of the variable thread connector.

6. The self-priming foam sand flushing device according to claim 4, characterized in that, The nitrogen inlet is located at the connection point between the connecting pipe and the nozzle.

7. The self-priming foam sand flushing device according to claim 1, characterized in that, The inner wall of the sealing body at the connection with the outlet connector is connected to a sealing connector, and the throat support tube is connected inside the sealing connector. The throat support tube is connected inside the throat tube and the diffuser tube.

8. A self-priming foam sand flushing device according to claim 7, characterized in that, The throat support tube is also connected to a compression tube, which is located between the throat tube and the diffuser tube.

9. A self-priming foam sand flushing device according to claim 8, characterized in that, The inner diameter of the throat is smaller than the inner diameter of the diffuser.

10. A self-priming foam sand flushing device according to claim 9, characterized in that, The inner diameter of the compression tube gradually increases from the end near the throat to the end near the diffuser tube.

11. A self-priming foam sand flushing device according to claim 7, characterized in that, The outer wall of the throat support tube is threaded with an adjusting nut, which is used to tighten the sealing joint and the sealing body.

12. The self-priming foam sand flushing device according to claim 1, characterized in that, The outer wall of the variable thread connector is threaded with a locking nut, and the locking nut is also connected to the transition connector.

13. A self-priming foam sand flushing device according to claim 1, characterized in that, A sealing ring is fitted onto the outer wall of the variable-stretcher connector.

14. A self-priming foam sand flushing device according to claim 13, characterized in that, The sealing ring is connected to the outside of the variable thread connector via a sealing nut.

15. A self-priming foam flushing device according to claim 14, characterized in that, The outlet connector is externally connected to a sealing nut.

16. A self-priming foam sand flushing device according to claim 1, characterized in that, Sealing rings are provided at the connection points of the variable-fastening connector and the air inlet connector, the air inlet connector and the air inlet pipe, the air inlet connector and the transition connector, the variable-fastening connector and the sealing body, and the sealing body and the outlet connector.

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