Locking mechanism of underwater high-pressure wellhead

Abstract

The invention relates to a locking mechanism for an underwater high-pressure wellhead. The locking mechanism is used for locking a casing hanger and a wellhead, and comprises a locking main body, a support connecting ring and a driving mandrel, wherein the locking main body is provided with an anti-rotation component matched with the casing hanger; one end of the support connecting ring is connected with the locking main body; and the driving mandrel is connected with the other end of the support connecting ring, the driving mandrel is sleeved with a wellhead locking ring, and the driving mandrel drives the wellhead locking ring to lock the driving mandrel and the wellhead. According to the locking mechanism of the underwater high-pressure wellhead, double locking between the casing hanger and the wellhead is achieved, so that the casing hanger is not prone to axial movement under the action of annular pressure, and smooth oil and gas exploitation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of offshore oil production equipment, in particular to a locking mechanism for an underwater high-pressure wellhead. Background technique [0002] As countries around the world gradually strengthen the exploration of offshore oil and gas, and gradually increase investment in offshore oil and gas exploitation, the application of underwater wellheads is becoming more and more extensive. Underwater wellheads are multi-layer pipe systems composed of conduits and casings. During the drilling process, it communicates and supports the blowout preventer group to form a drilling fluid circulation channel. After the completion of the well, the Christmas tree is fixed to form an oil and gas transmission channel, and it is used to support the casing string and seal the casing string annulus to achieve control from For the purpose of underwater wellhead formation pressure, the sealing performance of the inner casing stri...

AI Technical Summary

Problems solved by technology

[0005] An embodiment of the present invention provides a locking mechanism for an underwater high-pressure wellhead to solve the problem of insufficient fastening force of the inner casing string in the related art when exploiting high-temperature and high-pressure oil and gas wells, and the inner casing string is under the pressure of the annular space. The pipe string is prone to axial movement, resulting in failure of the annular seal and oil and gas leakage

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