Casing head and annular sealing device tripping-in tool for deepwater well drilling, and application method thereof

Abstract

The invention discloses a casing head and annular sealing device tripping-in tool for deepwater well drilling, and an application method thereof. The tool comprises a mandrel. A suspension structure is in sealing connection with the upper portion of the outer wall of the mandrel through a torque transmission structure. One end of the mandrel penetrates a piston slidably. An communication valve structure is arranged between the inner wall of the torque transmission structure and the outer wall of the mandrel. The suspension structure comprises a suspension barrel. An elastic pin capable of rotating to hook or release an annular sealing device is arranged at the bottom of the outer wall of the suspension barrel. A rotating barrel is in sealed and fixed connection with the lower portion of the inner wall of the suspension barrel. The inner wall of the rotating barrel is connected to the outer wall of the piston through a thread. An open lock ring sleeves one end of the piston, and can radially extend to hook a casing head or radially contract to release the casing head. The casing head and annular sealing device tripping-in tool and the application method thereof have the advantages of capability of mounting the casing head and the annular sealing device at a benthonic underwater wellhead, few mounting and constructing step and low cost.

Description

technical field [0001] The invention relates to the technical field of marine deepwater drilling, in particular to a running tool for a casing head and an annular space sealing device for deepwater drilling and a method for using the same. Background technique [0002] Offshore oil and gas resources have become an important source of energy supply, and high output, high investment, and high risk are the characteristics of offshore deepwater oil and gas exploration and development operations. The subsea wellhead system is the basic component of deepwater drilling, well completion, oil production and other operations. The multi-layer casing head and annular space sealing device are installed inside the underwater wellhead. The casing head is used to hang the casing, and the weight of the casing string is applied to the On the underwater wellhead, the sealing device is used to seal the annular space between the casing head and the underwater wellhead, and isolate the outer annu...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a casing head and annulus sealing device running tool for deepwater drilling and its use method, which overcomes the problems of complicated installation and high cost of matching equipment in the prior art. The head and annulus sealing device running tool and its use method can meet the requirements of installing the casing head and the annulus sealing device at the subsea wellhead, and have the advantages of less installation and construction steps and lower cost

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