A tubing-in-place jet device

Abstract

The oil pipe inner isolation jet flow device comprises an upper joint, a bridge type channel, a connecting nipple, an angle adjusting mechanism, a mandrel and a lower joint which are connected in sequence; the end of the upper joint close to the bridge type channel is connected with a nozzle; the bridge type channel comprises a formation fluid channel and a mixed fluid channel; the formation fluid channel is communicated with the connecting nipple; the end of the mixed fluid channel close to the nozzle is provided with a throat; the other end of the mixed fluid channel is communicated with the outside; the angle adjusting mechanism comprises an angle adjusting cap, a locking cap and an angle adjusting lower nipple; the angle adjusting cap and the angle adjusting lower nipple are sleeved on the connecting nipple and are fastened through the locking cap; the mandrel is sleeved with a rubber sleeve; an annulus is formed between the mandrel and the rubber sleeve; a pipeline upper joint is arranged on the upper joint; a pipeline lower joint is arranged on the mandrel; a pipeline is arranged between the pipeline upper joint and the pipeline lower joint; and the upper joint is communicated with the annulus. The oil pipe inner isolation jet flow device can realize the functions of jet flow and isolation, has the technical advantages of fast liquid discharge efficiency, convenient construction and low cost and the like.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to a sealing jet device for oil pipes. Background Technology

[0002] During offshore gas field development, formation energy gradually decreases. When the gas production rate is lower than the critical fluid carrying capacity of the well tubing, the produced gas cannot carry more fluid, resulting in fluid slippage. This manifests as fluid accumulation in the wellbore, which can gradually lead to water flooding of the gas well and eventually cause the well to shut down due to fluid accumulation.

[0003] In response to the above situation, offshore gas wells mainly employ methods such as gas lift drainage, velocity tubing drainage, and electric pump drainage. Each of these drainage technologies has its own applicable range. For example, existing patent document CN111911120A proposes a continuous concentric tube pressurized jet drainage gas production device and method; patent document CN104358524B proposes a continuous tubing velocity string and drainage gas production method; patent document CN102953711B proposes a drainage gas production device and method for horizontal gas wells; and patent document CN114278249A proposes a fixed tubing composite enhanced drainage string and its drainage method for offshore low-pressure horizontal gas wells.

[0004] Research has revealed that current measures for effectively draining fluid from offshore gas wells involve relatively complex downhole tool combinations and demand high-performance equipment; while simpler lifting measures are less effective. Therefore, a lifting tool that is both highly effective and easy to implement is needed for large-scale offshore application. Summary of the Invention

[0005] This invention addresses the problem of fluid accumulation and lift in gas wells by providing an in-tubing sealing jet device. Without moving the production tubing, this device, through the installation of coiled tubing or a small tubing section, achieves sealing and jetting functions within the tubing, thereby draining the fluid from the wellbore to the surface. This device offers advantages in gas well fluid drainage, including significant drainage effect, safe and reliable operation, ease of use, and convenient construction.

[0006] This application is achieved using the following technical solution.

[0007] An internal sealing jet device for oil pipes includes an upper connector, a bridge-type channel, a connecting short section, an angle adjustment mechanism, a mandrel, and a lower connector connected in sequence. The upper connector is connected to a nozzle at one end near the bridge-type channel. The bridge-type channel includes a formation fluid channel at the bottom and a mixed fluid channel in the middle. The formation fluid channel communicates with the connecting short section. The mixed fluid channel has a throat at one end near the nozzle and communicates with the outside at the other end away from the nozzle. The angle adjustment mechanism includes an angle adjustment cap, a locking cap, and an angle adjustment lower short section. Both the angle adjustment cap and the angle adjustment lower short section are fitted onto the connecting short section and secured by the locking cap. A rubber sleeve is fitted over the mandrel, forming an annular space between the mandrel and the rubber sleeve. An upper connector has an inline connector on one side, and a lower connector has a lower connector on one side of the mandrel. A pipeline connects the upper connector and the lower connector, allowing communication between the upper connector and the annular space between the mandrel and the rubber sleeve.

[0008] Furthermore, the upper connector is equipped with a screen, which is located on the side of the upper connector away from the bridge channel.

[0009] Furthermore, the upper connector is connected to the bridge channel via threads and is sealed by an O-ring on the upper connector.

[0010] Furthermore, two power fluid channels are formed inside the upper connector, one of which is connected to the nozzle and the other is connected to the connector on the pipeline.

[0011] Furthermore, the upper connector is connected to the nozzle via threads and sealed by an O-ring around the nozzle.

[0012] Furthermore, the bridge-type channel is connected to the throat via threads and sealed with an O-ring in the throat.

[0013] Furthermore, the bridge channel is connected to the connecting short section via threads and sealed by the bridge channel O-ring.

[0014] Furthermore, the angle-adjustable lower section is connected to the mandrel via a thread and is sealed by an O-ring of the angle-adjustable lower section.

[0015] Furthermore, the end of the mandrel near the lower connector has an inner and outer sleeve structure. The end of the inner tube of the mandrel is connected to the lower connector by a thread and sealed by a mandrel O-ring.

[0016] Furthermore, one end of the rubber tube is connected to the outer tube of the mandrel via a thread and is sealed by an O-ring on the rubber tube; the other end of the rubber tube is connected to the lower connector via a thread and is sealed by an O-ring on the lower part of the rubber tube.

[0017] This application has the following beneficial effects.

[0018] (1) The device of the present invention can realize the sealing and jetting functions in the tubing, realize the injection of high pressure dynamic fluid into the small tubing, and the jet lifting of formation fluid to solve the problem of liquid accumulation in gas wells;

[0019] (2) The device of the present invention can be used for live well operations without moving the tubing string or pressurizing the well, thus avoiding gas layer damage caused by conventional well workover operations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 Sectional view along line AA;

[0022] Figure 3 This is a schematic diagram of the structure of the connector of the present invention.

[0023] Among them, 1. Upper connector; 2. Screen; 3. In-line connector; 4. Upper connector O-ring; 5. Nozzle O-ring; 6. Nozzle; 7. Throat; 8. Throat O-ring; 9. Pipeline; 10. Bridge channel; 11. Bridge channel O-ring; 12. Connecting sub; 13. Angle adjustment cap; 14. Connecting sub O-ring; 15. Locking cap; 16. Angle adjustment lower sub; 17. Angle adjustment lower sub O-ring; 18. Mandrel; 19. In-line connector 20. Top O-ring of the rubber sleeve; 21. Rubber sleeve; 22. Bottom O-ring of the rubber sleeve; 23. O-ring of the mandrel; 24. Lower connector; 25. Formation fluid channel; 26. Pipeline channel; 27. Mixed fluid channel; 28. Oil pipe thread of the upper connector; 29. ​​Power fluid channel; 30. Screen connection thread of the upper connector; 31. Pipeline connection thread of the upper connector; 32. Bridge channel connection thread of the upper connector; 33. Nozzle connection thread of the upper connector. Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1-3 As shown, an internal sealing jet device for oil pipes includes an upper connector 1, a screen 2, an upper connector 3, a nozzle 6, a throat 7, a pipeline 9, a bridge-type channel 10, a connecting short section 12, an angle adjusting cap 13, a locking cap 15, an angle adjusting lower short section 16, a mandrel 18, a lower connector 19, a rubber sleeve 21, and a lower connector 24.

[0026] The upper connector 1 is located at the top of this device and is used for the transmission of power fluid. Specifically, as shown... Figure 3As shown, the upper connector 1 forms two power fluid channels 29, one of which is the main channel located on the central axis of the device, and the other is a branch channel. The branch channel has a pipeline connection thread 31 at its end for connection to the upper connector 3. Power fluid enters the upper connector 1 through the power fluid channel 29 and then enters the upper connector 3, providing energy to the nozzle 6 and the cartridge 21. The top of the upper connector 1 has an oil pipe thread 28 for connection to a continuous oil pipe or a small oil pipe. Near the top of the upper connector 1, a screen connection thread 30 is provided for connection to a screen 2, enabling the screen to move. The fluid is filtered to prevent large particles of impurities from clogging the nozzle 6. The upper connector 1 has a bridge channel connecting thread 32 and an O-ring groove on the outside near the bridge channel 10 for connecting with the bridge channel 10. An O-ring 4 is embedded in the O-ring groove to achieve a sealing fit between the upper connector 1 and the bridge channel 10. The upper connector 1 has a nozzle connecting thread 33 and an O-ring groove on the inside near the bridge channel 10 to connect with the nozzle 6. The nozzle 6 changes the fluid from a high-pressure, low-speed state to a high-speed, low-pressure state, achieving negative pressure suction of the liquid in the lower part of the jet tool inside the oil pipe. An O-ring 5 is embedded in the O-ring groove to achieve a seal between the upper connector 1 and the nozzle 6.

[0027] The bridge-type channel 10 is used to provide a channel for the mixed liquid and formation fluid. Specifically, as shown... Figure 2 As shown, the bridge-type channel 10 includes a mixing liquid channel 27 located in the middle and a formation fluid channel 25 located below the mixing liquid channel 27. The formation fluid channel 25 is crescent-shaped and surrounds the mixing liquid channel 27. The mixing liquid channel 27 has a throat 7 at one end near the nozzle 6 and the other end connected to the outside. The bridge-type channel 10 and the throat 7 are sealed by a throat O-ring 8 to prevent cross-contamination between the mixing liquid channel 27 and the formation fluid channel 25, which would cause the throat 7 to malfunction and affect the jetting effect. The bridge-type channel 10 uses an internal right-angle step to limit the throat 7. The formation fluid enters between the nozzle 6 and the throat 7 through the formation fluid channel 25. The motive fluid is drawn into the formation fluid by the nozzle 6 to form a mixture, which then enters the mixing liquid channel 27 of the bridge-type channel 10 through the inside of the throat 7. The end of the bridge channel 10 away from the upper connector 1 is connected to the connecting short section 12 by a thread and is limited by a right-angle step. A bridge channel O ring 11 for sealing is provided between the bridge channel 10 and the connecting short section 12.

[0028] An angle adjusting cap 13 and an angle adjusting lower sub-section 16 are sequentially fitted onto the end of the connecting sub-section 12 furthest from the bridge channel 10. A locking cap 15 is fitted over the angle adjusting cap 13 and the angle adjusting lower sub-section 16. Specifically, the angle adjusting cap 13 is threaded to the connecting sub-section 12; the angle adjusting lower sub-section 16 is threaded to the connecting sub-section 12 and sealed by the connecting sub-section O-ring 14; the locking cap 15 is threaded to lock onto the angle adjusting cap 13. The angle adjusting lower sub-section 16 can rotate 360° axially. The angle adjusting cap 13 limits the angle adjusting lower sub-section 16 to the end closer to the connecting sub-section 12, and the locking cap 15 limits the angle adjusting lower sub-section 16 to the end furthest from the connecting sub-section 12, thus locking the angle adjusting lower sub-section 16. The combination of the angle adjustment cap 13, locking cap 15 and angle adjustment lower section 16 in this application can realize the adjustment of the distance and angle between the mandrel 18 and the upper connector 1, thereby realizing the alignment of the upper connector 3 and the lower connector 19.

[0029] The end of the angle-adjustable lower section 16 furthest from the connecting section 12 passes through the locking cap 15 and is connected to the spindle 18 via a thread. An angle-adjustable lower section O-ring 17 for sealing is provided between the angle-adjustable lower section 16 and the spindle 18. The end of the spindle 18 furthest from the angle-adjustable lower section 16 has an inner and outer tube structure. The end of the inner tube of the spindle 18 is connected to the lower connector 24 via a thread and sealed by the spindle O-ring 23.

[0030] The rubber sleeve 21 is fitted outside the inner tube of the mandrel 18. One end of the rubber sleeve 21 is connected to the outer tube of the mandrel 18 via a thread, and a seal is achieved between the rubber sleeve and the mandrel 18 via an O-ring 20. The other end of the rubber sleeve 21 is connected to the end of the lower connector 24 via a thread, and a seal is achieved between the rubber sleeve and the lower connector 24 via a lower O-ring 22. This creates an annulus between the rubber sleeve 21 and the inner tube of the mandrel 18. The top of the annulus forms a power fluid inlet channel, which connects to the lower connector 19. The upper connector 3 and the lower connector 19 are connected to the pipeline 9 via a thread, forming a pipeline channel 26 inside the pipeline 9. The power fluid enters the upper connector 3 through the power fluid channel 29 of the upper connector 1, then enters the pipeline 9, then the lower connector 19, and finally enters the annulus between the mandrel 18 and the rubber sleeve 21, providing power for the setting of the rubber sleeve 21. After the rubber sleeve 21 is set, the mixture and formation fluid are isolated.

[0031] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A jet sealing device for oil pipes, characterized in that: The system includes an upper connector (1), a bridge channel (10), a connecting section (12), an angle adjustment mechanism, a mandrel (18), and a lower connector (24) connected in sequence. The upper connector (1) is connected to a nozzle (6) at one end near the bridge channel (10). The bridge channel (10) includes a formation fluid channel (25) at the bottom and a mixed liquid channel (27) at the middle. The formation fluid channel (25) is connected to the connecting section (12). The mixed liquid channel (27) has a throat (7) at one end near the nozzle (6) and is connected to the outside at the other end away from the nozzle (6). The angle adjustment mechanism includes an angle adjustment cap. (13) Locking cap (15) and angle adjustment lower section (16), the angle adjustment cap (13) and the angle adjustment lower section (16) are both sleeved on the connecting section (12) and fastened by locking cap (15); the mandrel (18) is sleeved with rubber tube (21), and an annular space is formed between the mandrel (18) and rubber tube (21); one side of the upper connector (1) is provided with an upper connector (3), and one side of the mandrel (18) is provided with a lower connector (19), and a pipeline (9) is provided between the upper connector (3) and the lower connector (19), so that the annular space between the upper connector (1) and the mandrel (18) and rubber tube (21) is connected.

2. The tubing internal sealing jet device according to claim 1, characterized in that: The upper connector (1) is provided with a screen (2), which is located on the side of the upper connector (1) away from the bridge channel (10).

3. The tubing internal sealing jet device according to claim 1, characterized in that: The upper connector (1) is connected to the bridge channel (10) by threads and sealed by the upper connector O ring (4).

4. The tubing internal sealing jet device according to claim 1, characterized in that: Two power fluid channels (29) are formed inside the upper connector (1), one of which is connected to the nozzle (6) and the other is connected to the pipeline connector (3).

5. The tubing internal sealing jet device according to claim 1, characterized in that: The upper connector (1) is connected to the nozzle (6) by threads and sealed by the nozzle O-ring (5).

6. The tubing internal sealing jet device according to claim 1, characterized in that: The bridge channel (10) is connected to the throat (7) by threads and sealed by the throat O-ring (8).

7. The tubing internal sealing jet device according to claim 1, characterized in that: The bridge channel (10) is connected to the connecting short section (12) by threads and sealed by the bridge channel O ring (11).

8. The tubing internal sealing jet device according to claim 1, characterized in that: The angle-adjustable lower section (16) is connected to the mandrel (18) by a thread and is sealed by the angle-adjustable lower section O ring (17).

9. The tubing internal sealing jet device according to claim 1, characterized in that: The end of the mandrel (18) near the lower connector (24) has an inner and outer tube structure. The end of the inner tube of the mandrel (18) is connected to the lower connector (24) by a thread and sealed by the mandrel O ring (23).

10. The tubing internal sealing jet device according to claim 9, characterized in that: One end of the rubber tube (21) is connected to the outer tube of the mandrel (18) by a thread and is sealed by an O-ring (20) on the rubber tube; the other end of the rubber tube (21) is connected to the lower connector (24) by a thread and is sealed by an O-ring (22) on the rubber tube.

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