CN114718501B

CN114718501B - Quick tieback sealing device for sleeve and operation method thereof

Info

Publication number: CN114718501B
Application number: CN202210333419.3A
Authority: CN
Inventors: 及铭侠; 李君宝; 王翊民; 韩耀图; 张明; 余涵; 杨喜; 王允海; 安文目; 范子涛
Original assignee: CNOOC Energy Technology and Services Ltd
Current assignee: CNOOC Energy Technology and Services Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-07-28
Anticipated expiration: 2042-03-31
Also published as: CN114718501A

Abstract

The invention discloses a sleeve quick tieback sealing device and an operation method thereof, wherein the device comprises a top joint, a lower joint, a guide shoe and a spiral slip; the invention has simple operation and improves the operation time efficiency; the retaining teeth can ensure the continuous pressurization of the piston and the firmness of the tieback; the gripping range of the spiral slips is 9-12 mm, and the deformation adaptation degree of the tie-back sleeve is large; the lead ring and the rubber seal can be effectively attached to the outer wall of the sleeve, and the small-range deformation part of the sleeve can be sealed; the baffle ring is provided with a pressure transmission hole, so that pressure can be transmitted to an annulus between the lead ring and the rubber seal; the pressure test at the butt joint after tie-back can be performed, and the tie-back quality is ensured.

Description

Quick tieback sealing device for sleeve and operation method thereof

Technical Field

The invention belongs to the technical field of offshore oil downhole operation, and particularly relates to a sleeve quick tieback sealing device and an operation method thereof.

Background

With the domestic safety and environmental protection management upgrading, the technical requirements for rapidly plugging and recovering the integrity of a shaft after disaster is applied to offshore oil and gas wells are higher and higher. At present, aiming at the damage of the casing in the wellhead area, the operations such as casing tie-back sealing and wellhead installation are carried out after the lower part of the damaged part of the casing is cut. However, because the positions of the casing damage have randomness, the distance between the cutting port and the next coupling is long or short, cement in the ring is extremely difficult to treat, the requirement of quickly recovering the integrity of the shaft cannot be met, and the pressure test on the interface cannot be performed in time after tie-back.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a sleeve quick tieback sealing device and an operation method thereof.

The invention is realized by the following technical scheme:

a quick tieback sealing device for a casing comprises a top joint, a lower joint, a guide shoe and a spiral slip;

the lower end of the top joint is connected with the lower joint through threads, a limit step is formed on the inner wall of the top joint, a groove is formed on the inner wall of the top joint, a lead ring, a baffle ring, a rubber seal and a piston are sequentially arranged in the groove from top to bottom, retaining teeth are arranged on the inner wall of the top joint at the groove, and a seat hole is formed on the wall of the top joint beside a piston packing;

the lower end of the lower joint is connected with the guide shoe through threads, and the inside of the lower joint is connected with a spiral slip;

in the technical scheme, the upper part of the top joint is provided with the sleeve thread for connecting with the sleeve.

In the technical scheme, the spiral slip is externally provided with the wide-sawtooth left-handed threads, the inner gripping teeth are multi-head left-handed sawtooth threads, and the lower part of the spiral slip is welded with the finger-shaped key for being matched with the control card to prevent the slip from rotating.

In the technical scheme, the pressure test hole is formed in the cylinder wall of the top connector, which is located at the rubber seal installation position.

In the technical scheme, the baffle ring is provided with the pressure transmission hole.

The operation method of the quick tie-back sealing device for the sleeve is as follows:

firstly, lowering the tool to a cutting hole of the cutting sleeve, introducing the sleeve into the tool through the guide shoe, lowering the tubular column until the cutting hole of the sleeve contacts the limiting step, lifting the tubular column, confirming that the spiral slip grips the sleeve, and lowering the tubular column to a neutralization point;

step two, connecting a hand pump to the seat hole, pushing a piston by pressing, pushing a rubber seal by the piston and extruding a lead ring by a baffle ring, continuously extruding the rubber seal by the baffle ring to finish the expansion seal after the lead ring achieves the expansion seal effect, and locking the piston by a retaining tooth after the seat is finished, so that no relative movement is generated, and continuously extruding the lead ring and the rubber seal; the pressure release and manual pump is disassembled, and blind plugs are arranged on the seat holes;

and thirdly, connecting the hand pump to the pressure testing hole, testing the pressure of the annulus between the lead ring and the rubber seal by pressing, ensuring the effectiveness of the two seals, releasing the pressure after the pressure testing is finished, and detaching the hand pump to install the blind plug on the pressure testing hole.

The beneficial effects of the invention are as follows:

1. the operation is simple, and the operation time efficiency is improved.

2. The retaining teeth can ensure the continuous pressurization of the piston and the firmness of the tieback.

3. The gripping range of the spiral slips is 9-12 mm, and the deformation adaptation degree of the tie-back sleeve is large.

4. The lead ring and the rubber seal can be effectively attached to the outer wall of the sleeve, and the small-range deformation part of the sleeve can be sealed.

5. The baffle ring is provided with a pressure transmission hole, so that pressure can be transmitted to an annulus between the lead ring and the rubber seal.

6. The pressure test at the butt joint after tie-back can be performed, and the tie-back quality is ensured.

Drawings

Fig. 1 is a full section view of a quick tie-back sleeve seal.

Fig. 2 is a full sectional view of the quick tie-back seal of the sleeve after tie-back.

Wherein: 1. a thread; 2. a tool centerline; 3. a top joint; 4. a limit step; 5. a lead ring; 6. a baffle ring; 7. sealing with rubber; 8. a piston; 9. piston packing; 10. sealing holes; 11. a lower joint; 12. spiral slips; 13. a control card; 14. guiding shoes; 15. a retaining tooth; 16. and a pressure test hole.

Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.

Detailed Description

The technical scheme of the invention is further described below with reference to specific embodiments.

Examples

Referring to fig. 1, a quick tieback sealing device for a sleeve comprises a sleeve thread 1, a top joint 3, a limiting step 4, a lead ring 5, a baffle ring 6, a rubber seal 7, a piston 8, a piston packing 9, a seat hole 10, a lower joint 11, a screw slip 12, a control card 13, a guide shoe 14, a stop tooth 15, a pressure test hole 16 and the like.

The upper part of the top joint 3 is provided with sleeve threads for connecting with a sleeve; the lower part is provided with threads for connecting with the lower joint 11; the inside is provided with a limit step 4 and a groove for placing a lead ring 5, a baffle ring 6, a rubber seal 7 and a piston 8. And the limiting step 4 is used for limiting the upward movement of the sleeve. And the lead ring 5 is used for sealing the inner wall of the top joint 3 with the outer wall of the sleeve so as to prevent the pressure in the sleeve from being shifted out. The baffle ring 6 is used for transmitting thrust to squeeze the lead ring 5 and the rubber seal 7. And the rubber seal 7 is used for sealing the inner wall of the top joint 3 with the outer wall of the sleeve to prevent the pressure in the sleeve from being shifted out. The piston 8 is used for extruding the lead ring 5 and the rubber seal 7. The piston packing 9 is used for sealing the inner walls of the piston 8 and the top joint 3 and ensuring that hydraulic force acts on the piston surface. The seat hole 10 is used for pressing and pushing the piston 8 to seal the outer wall of the sleeve and the inner wall of the top joint 3. The lower joint 11 is threaded at the upper part and is used for being connected with the top joint 3; the lower part is provided with threads for connecting the guide shoe 14; the interior is threaded to engage the helical slips 12 for securing the casing. The outside of the spiral slip 12 is provided with a left-handed thread with wide saw teeth, and the spiral slip is matched with the internal thread of the lower joint 11; the internal gripping teeth are multi-head left-handed zigzag screw teeth and are used for fixing the sleeve; the lower part is welded with a finger key for cooperating with the control card 13 to prevent the slips from rotating. The control card 13 is used for fixing the spiral slip 12 and preventing the slip from rotating. The shoe 14 is used for guiding the top of the sleeve into the tieback sealing device. The retaining teeth 15 are used for preventing the piston 8 from moving downwards. The pressure test hole 16 is used for checking the tightness between the lead ring 5 and the rubber seal 7.

The working principle of the invention is as follows:

taking a tie-back wellhead casing as an example, the tool of the invention is lowered to the position of a cutting casing cut, the casing is led into the tool through the guide shoe 14, a pipe column is lowered until the casing cut contacts the limit step 4, the pipe column is lifted, the screw slips 12 are confirmed to grasp the casing, and the pipe column is lowered to a neutralization point. Connecting a hand pump to a seat hole 10, pushing a piston 8 through pressing, pushing a rubber seal 7 and a baffle ring 6 to extrude a lead ring 5 by the piston 8, continuously extruding the rubber seal 7 by the baffle ring 6 to finish expanding sealing after the lead ring 5 reaches the expanding sealing effect, and locking by a retaining tooth 15 after the seat is finished, so that no relative movement is generated, and continuously extruding the lead ring 5 and the rubber seal 7. The pressure release manual pump is disassembled, and the sealing hole is installed in a blind way. The pressure testing device is connected with the hand pump to the pressure testing hole, the annular space between the lead ring 5 and the rubber seal 7 is tested by pressing, the effectiveness of the two seals is guaranteed, the pressure is relieved after the pressure testing is finished, the hand pump is disassembled, and the pressure testing hole is blindly blocked.

The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. The operation method of the quick tieback sealing device for the sleeve is characterized by comprising the following steps of: the sleeve quick tieback sealing device comprises a top joint, a lower joint, a guide shoe and a spiral slip; the lower end of the top joint is connected with the lower joint through threads, a limit step is formed on the inner wall of the top joint, a groove is formed on the inner wall of the top joint, a lead ring, a baffle ring, a rubber seal and a piston are sequentially arranged in the groove from top to bottom, retaining teeth are arranged on the inner wall of the top joint at the groove, and a seat hole is formed on the wall of the top joint beside a piston packing; the lower end of the lower joint is connected with the guide shoe through threads, and the inside of the lower joint is connected with a spiral slip; the screw slips are externally provided with wide-sawtooth left-handed threads, the inner gripping teeth are multi-head left-handed sawtooth screw teeth, and the lower parts of the screw slips are welded with finger-shaped keys for being matched with the control card to prevent the slips from rotating; the cylinder wall of the top joint, which is positioned at the rubber seal installation position, is provided with a pressure test hole, and the baffle ring is provided with a pressure transmission hole;

the operation method comprises the following steps:

step one, a sleeve is put down to quickly tie back a sealing device to a cutting sleeve cutting port, the sleeve is led into a tool through a guide shoe, a tubular column is put down until the sleeve cutting port contacts a limiting step, the tubular column is lifted, a spiral slip is confirmed to grasp the sleeve, and the tubular column is put down to a neutralization point;

step two, connecting a hand pump to a seat hole, pushing a piston by pressing, pushing a rubber seal by the piston and extruding a lead ring by a baffle ring, continuously extruding the rubber seal by the baffle ring to finish the expansion seal after the lead ring achieves the expansion seal effect, and locking the piston by a retaining tooth after the seat is finished, so that no relative movement is generated, and continuously extruding the lead ring and the rubber seal; the pressure release and manual pump is disassembled, and blind plugs are arranged on the seat holes;

2. The method of claim 1, wherein the step of operating the quick tie-back seal comprises: the upper part of the top joint is provided with a sleeve thread for connecting with a sleeve.