Underwater well repair assembly

An assembly and workover technology, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of high construction cost and high workover cost of special workover ships, and improve workover Efficiency, reduction of operational safety risks, and reduction of operating costs

Inactive Publication Date: 2017-12-22
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

The former generally requires the use of semi-submersible drilling platforms or drilling ships, and the workover costs are relatively high for light workover operations that do not move the downhole string; although the latter avoids the use of drilling platforms or drilling ships, the workover technology It needs to be equipped with a special workover ship, and the construction cost of the special workover ship is not cheap

Method used

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  • Underwater well repair assembly
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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] Such as figure 1 As shown, the present invention provides a subsea workover assembly 100, which includes a safety joint 1, a blowout preventer 2, a fully sealed shear ram blowout preventer 3, a stress joint 4 and Retractor 5, and the guide shorting 6 arranged inside the stress joint 4; the subsea workover assembly 100 is connected with the drill pipe 200 through the safety joint 1, and in an emergency, the safety joint 1 can be disconnected to make the drill pipe 200 is separated from the lower subsea workover assembly 100; the blowout preventer 2 is used to close the wellbore when there is no pipe string in the well; the fully sealed shear ram blowout preventer 3 is used to cut off the coiled tubing or steel wire in an emergency The working steel wire rope or other pipe strings used for well workover close the wellbore; the tieback 5 is used ...

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Abstract

The invention relates to an underwater well repair assembly. The underwater well repair assembly comprises a safety joint, a blowout control valve, a totally-closed shear blade blowout preventer, a stress joint and a tie-back device which are sequentially connected from top to bottom, as well as a guiding short circuit arranged in the stress joint, wherein the safety joint is used for being connected with a drill pipe; and the tie-back device is used for being connected with an underwater Christmas tree. According to the underwater well repair assembly, well repair operation of a deep water oil and gas field can be performed by adoption of an active-service engineering ship, and a large-scale floating-type drilling platform or a special well repair ship for building is not required to be used, so that the operation cost can be greatly lowered, and the well repair efficiency is improved. As the safety joint is arranged, in case of such severe working conditions as typhoon during operation, emergency disposal can be performed, temporary well abandoning can be quickly and reliably conducted, the engineering ship or the drilling platform is withdrawn, and the safety risks during operation can be reduced. The underwater well repair assembly can be used for the engineering ship or the drilling platform, and can be widely applied to well repair operation of the deep water oil and gas field adopting an underwater production system development mode.

Description

technical field [0001] The invention belongs to the technical field of underwater workover in offshore oil and gas fields, and in particular relates to an underwater workover assembly. Background technique [0002] Oil and gas wells need to be maintained and repaired during the production process of offshore oil and gas fields. At present, there are two main workover technologies for subsea production systems: conventional workover technology and riserless workover technology. Conventional well workover technology requires the use of riser and underwater blowout preventer and other equipment. Firstly, the passage between the underwater wellhead and the surface wellhead is established, and then various workover measures are implemented; The device can lower small tools such as coiled tubing and wire rope into the wellbore for workover operations, and is suitable for light workover without moving downhole strings. The former generally requires the use of semi-submersible dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/076
CPCE21B33/076
Inventor 许亮斌肖凯文周建良李清平王宇
Owner CHINA NAT OFFSHORE OIL CORP
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