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Well repair device capable of achieving temporary well well sealing and well killing and application method of well repair device

A technology for killing and sealing wells, applied in wellbore/well components, drilling equipment, earth-moving drilling, etc., can solve the problems of large well control risks and environmental pollution, insufficient sealing and anchoring force, casing sealing leakage, etc. Prevention of well control risk and risk of environmental contamination, high sealing pressure, reliable sealing effect

Inactive Publication Date: 2022-01-28
天津凯雷油田技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the reasons of tools and processes, there are problems of casing seal leakage or insufficient seal anchoring force
The existence of these problems also leads to a greater risk of well control and environmental pollution in the treatment of offshore accident wells

Method used

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  • Well repair device capable of achieving temporary well well sealing and well killing and application method of well repair device
  • Well repair device capable of achieving temporary well well sealing and well killing and application method of well repair device
  • Well repair device capable of achieving temporary well well sealing and well killing and application method of well repair device

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0040] 1) Workover tubing string for temporary sealing and killing: the connection sequence of the tubing string is from bottom to top, followed by sealing device, sealing tool for sealing device, cock valve, well killing float shoe, tie-back sealing device, etc. Casing sleeve and hydraulically releasable kill tieback.

[0041] 2) Use the drill pipe to send the temporary sealing and killing operation string into the casing, pressurize through the drill pipe, and the pressurized liquid reaches the sealing device through the hydraulically releasable kill tie-back, killing shoe, and plug valve Seating tool. The piston of the sealer setting tool pushes the sealer to move, thereby realizing the swelling seal of the sealer rubber tube and the anchoring of the slips, thereby realizing the sealing and anchoring of the sealer and the casing. At this time, the pressure in the well can be observed through the pressure gauge on the well killing float shoe, and the operation measures to b...

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PUM

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Abstract

The invention discloses a well repair device capable of realizing temporary well sealing and killing. The device consists of a well repair device body and comprises a pipe column for temporary well sealing and killing and well repair, the pipe column is sequentially provided with a hydraulic release well killing tie-back device tie-back sealing cylinder, a well killing float shoe, a plug valve, a blowout preventer seat sealing mechanism, a blowout preventer and a mechanical release well killing tie-back device from bottom to top; the tie-back sealing cylinder, the plug valve, the well killing float shoe and the blowout preventer seat sealing mechanism are connected through API casing threads; and the blowout preventer and the blowout preventer seat sealing mechanism are connected through left-hand special threads. The device can be quickly and efficiently connected with an oil well sleeve, and meanwhile, the device can be recycled with high quality.

Description

technical field [0001] The invention belongs to an auxiliary tool for temporarily treating wells in an oil field, and in particular relates to a workover device capable of temporarily closing and killing wells and an application method thereof. Background technique [0002] For the development of offshore oil fields, there are factors such as high development costs, high operational risks, and high requirements for environmental pollution. Oil and gas wells are required to ensure the safety of operation and construction no matter in the development or workover stage, and to prevent pollution to the marine environment. However, due to some special well conditions or accidents on the offshore platform, the casing of the oil and gas well above sea level is damaged. And because of the relatively high development cost of offshore oil and gas wells, wells are generally not abandoned. Will choose to do wellhead casing repair and tie back. After the wellhead casing is repaired an...

Claims

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Application Information

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IPC IPC(8): E21B33/10E21B23/06E21B17/02E21B21/08E21B23/00
CPCE21B33/10E21B23/06E21B17/021E21B21/08E21B23/00
Inventor 刘东明王启伟方涛贺勇寇光波侯红意
Owner 天津凯雷油田技术有限公司
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