Pressurized temporary well shut-in device for well repair

Abstract

The utility model relates to an under-pressure temporary well plugging device for well repair, which comprises a well plugging pipe column short section and is technically characterized in that a rotatable upper joint is sleeved at the upper end of the well plugging pipe column short section, a rotatable lower joint is sleeved at the lower end of the well plugging pipe column short section, and external threads are arranged on the peripheral surfaces of the rotatable upper joint and the rotatable lower joint. An axial long-strip-shaped groove is formed in the outer wall of the well plugging pipe column short section, an adhesive layer is arranged in the axial long-strip-shaped groove, an upper annular groove and a lower annular groove are formed in the upper portion and the lower portion, corresponding to the axial long-strip-shaped groove, of the outer wall of the well plugging pipe column short section, and elastic hoop rings used for restraining cables are arranged in the upper annular groove and the lower annular groove respectively. An annular leveling groove is formed in the position, corresponding to the installation position of the blowout preventer, of the outer wall of the well plugging pipe column short section, and a wide binding ring used for pressing a cable to avoid gaps is arranged in the annular leveling groove. The device can be conveniently connected with an in-well oil pipe and an oil pipe plug valve, the operation is convenient, and the sealing performance is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of well repair of oil production wells in oil fields, in particular to a temporary well sealing device under pressure for well repair. Background Art

[0002] During oil well maintenance operations, each well must be sealed to prevent excessive overflow. However, the monitoring cable must be disconnected and reconnected when the operation is resumed.

[0003] CN 219101293 U discloses a device for temporarily sealing a well under pressure during cable-based construction. The device comprises a through-type well-sealing tubing nipple. The nipple has a transmission conduit formed axially within it, with threads provided on its outer walls at both ends. A U-shaped groove is formed axially on the outer wall of the through-type well-sealing tubing nipple, and the inner wall of the U-shaped groove is evenly coated with rubber paint. When temporarily sealing the wellhead, a blowout preventer (BOP) is installed at the wellhead. The through-type well-sealing tubing nipple is vertically mounted at the wellhead. One end of the nipple is connected to the wellbore tubing via a threaded connection, and the other end passes through the BOP and connects to the tubing plug valve. This eliminates the need to disconnect the monitoring equipment cable during use, facilitating the acquisition of target formation data at any time. This is both safe and environmentally friendly, and can also shorten well occupation time. However, the following issues remain: 1. Connecting the wellbore tubing to the tubing plug valve requires rotating the tubing itself or the plug valve, which is laborious and restricts the location of the U-shaped groove, making it inconvenient to pre-buried cables. 2. The pre-buried cable area is prone to unevenness, which can lead to pressure release. Utility Model Content

[0004] The purpose of the utility model is to provide a temporary well sealing device under pressure for well repair, which has a reasonable structure and reliable use to solve the above problems. It is convenient to connect with the oil pipe and the oil pipe plug valve in the well, is easy to operate, and has enhanced sealing performance.

[0005] The technical solution of the utility model is:

[0006] Described connecting rod is a hollow tube, and its upper end is provided with a hole, and its lower end is provided with a hole, and its lower end is connected with the oil pipe in the well.

[0007] The above-mentioned pressurized temporary well sealing device for well repair is provided with an upper limit portion corresponding to the lower end of the rotatable upper joint on the short section of the well sealing pipe string, and an upper positioning sleeve for limiting the rotatable upper joint is welded to the upper end of the short section of the well sealing pipe string.

[0008] The above-mentioned pressurized temporary well sealing device for well repair is provided with a lower limit portion corresponding to the upper end of the rotatable lower joint on the short section of the well sealing pipe string, and a lower positioning sleeve for limiting the rotatable lower joint is welded to the lower end of the short section of the well sealing pipe string.

[0009] The beneficial effects of the utility model are:

[0010] 1. Use the rotatable upper and lower joints to connect the device between the oil pipe and the oil pipe plug valve in the well. When docking, you only need to rotate the rotatable upper and lower joints, which is easy to operate, saves time and effort, and is also convenient for pre-burying cables directly according to the direction of the cable without adjusting the direction.

[0011] 2. After pre-buried the cable into the axial long strip groove, use the elastic clamp ring to constrain the upper and lower parts of the cable to prevent it from falling out of the groove. Then use the wide tie ring to tighten the cable so that the position and the outer wall of the short section of the sealing pipe are located in the same circumferential plane. The wide tie ring contacts the blowout preventer to enhance the sealing performance and the pressure sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an axial cross-sectional view of the utility model;

[0013] Figure 2 This is a schematic diagram of the appearance structure of the utility model;

[0014] Figure 3 It is a schematic diagram of the use of the present utility model.

[0015] In the figure: 1. Rotatable upper joint, 2. Upper positioning sleeve, 3. Short section of sealing pipe string, 4. Axial elongated groove, 5. Upper annular groove, 6. Annular leveling groove, 7. Lower annular groove, 8. Rotatable lower joint, 9. Lower positioning sleeve, 10. Lower limit part, 11. Upper limit part, 12. Cable, 13. Elastic clamping ring, 14. Wide band ring. DETAILED DESCRIPTION

[0016] The utility model is described in detail according to the accompanying drawings.

[0017] like Figures 1 to 3As shown, the pressurized temporary well sealing device for well repair includes a well sealing string short section 3, the upper end of which is fitted with a rotatable upper joint 1, and the lower end of which is fitted with a rotatable lower joint 8. The outer circumference of the rotatable upper joint 1 is provided with an external thread for connecting to a tubing plug valve, and the outer circumference of the rotatable lower joint 8 is provided with an external thread for connecting to an oil tubing in the well. In this embodiment, the well sealing string short section 3 is provided with an upper limit portion 11 corresponding to the lower end of the rotatable upper joint 1, and an upper positioning sleeve 2 is welded to the upper end of the well sealing string short section 3 to limit the rotatable upper joint 1. The well sealing string short section 3 is provided with a lower limit portion 10 corresponding to the upper end of the rotatable lower joint 8, and a lower positioning sleeve 9 is welded to the lower end of the well sealing string short section 3 to limit the rotatable lower joint 8.

[0018] The outer wall of the well-sealing string sub 3 is provided with an axially elongated groove 4, within which an adhesive layer is provided. Upper and lower annular grooves 5 and 7 are provided on the outer wall of the well-sealing string sub 3, corresponding to the axially elongated groove 4. Each of these grooves contains an elastic clamping ring 13 for restraining the cable 12. An annular leveling groove 6 is provided on the outer wall of the well-sealing string sub 3, corresponding to the BOP installation location. A wide tie ring 14 is provided within this groove to compress the cable 12 and prevent gaps.

[0019] Working principle:

[0020] During use, the equipment cable 12 is first embedded in the axially elongated groove 4 of the well-sealing string sub 3. The upper and lower portions of the cable are restrained by the elastic clamping ring 13 to prevent it from falling out of the groove. The cable is then tightened by the wide tie ring 14, so that the cable is aligned with the outer wall of the well-sealing string sub 3. The well-sealing string sub 3 is connected to the wellbore tubing using the rotatable lower joint 8. After the upper end of the well-sealing string sub 3 passes through the blowout preventer, it is connected to the tubing plug valve using the rotatable upper joint 1. The blowout preventer is sealed by the wide tie ring 14, while the upper end of the equipment cable exits the blowout preventer, without affecting the sealing performance.

[0021] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.

Claims

1. A temporary well sealing device under pressure for well repair, comprising a well sealing pipe string short section, characterized in that: The upper end of the short section of the sealing pipe string is sleeved with a rotatable upper joint, and the lower end of the short section of the sealing pipe string is sleeved with a rotatable lower joint, the outer circumferential surface of the rotatable upper joint is provided with an external thread for connecting to the oil pipe cock valve, and the outer circumferential surface of the rotatable lower joint is provided with an external thread for connecting to the oil pipe in the well. The outer wall of the short section of the sealing pipe string is provided with an axial elongated groove, and an adhesive layer is provided in the axial elongated groove. The upper and lower parts of the outer wall of the short section of the sealing pipe string are provided with upper annular grooves and lower annular grooves corresponding to the axial elongated grooves, and elastic tightening rings for constraining cables are respectively provided in the upper annular groove and the lower annular groove, and an annular leveling groove is provided on the outer wall of the short section of the sealing pipe string corresponding to the installation position of the blowout preventer, and a wide strap ring is provided in the annular leveling groove for tightening the cable to avoid gaps.

2. The temporary well sealing device under pressure for well repair according to claim 1, characterized in that: The short section of the well sealing pipe string is provided with an upper limit portion corresponding to the lower end of the rotatable upper joint, and the upper end of the short section of the well sealing pipe string is welded with an upper positioning sleeve for limiting the rotatable upper joint.

3. The temporary well sealing device under pressure for well repair according to claim 1, characterized in that: The short section of the well sealing pipe string is provided with a lower limit portion corresponding to the upper end of the rotatable lower joint, and the lower end of the short section of the well sealing pipe string is welded with a lower positioning sleeve for limiting the rotatable lower joint.

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