Anti-slag cap for shallow water underwater wellhead and Christmas tree

Abstract

The invention relates to an anti-slag cap for a shallow water underwater wellhead and a Christmas tree. The anti-slag cap comprises an anti-slag cap body and a locking device, wherein the anti-slag cap body is of a cylindrical shell structure with a closed upper part and an open lower part and covers the top of a Christmas tree body; the locking device is used for locking and unlocking the anti-slag cap body and the Christmas tree body; the locking device comprises a supporting plate, a locking shaft body and an operation plate; the supporting plate is horizontally arranged on one side of the anti-slag cap body, an arc-shaped edge is formed on one side of the supporting plate, and the arc-shaped edge of the supporting plate makes contact with an outer wall of the anti-slag cap body; a through notch is formed in the side wall of the anti-slag cap body; the locking shaft body is arranged above the supporting plate and extends in the length direction of the supporting plate; the locking shaft body is embedded into the notch of the anti-slag cap body; a first recess is formed in one side; and one end of the operation plate is connected with one end of the locking shaft body through a first end plate. According to the anti-slag cap, seabed rock debris and slag can be prevented from falling into a wellhead and the interior of a tree body.

Description

technical field [0001] The invention relates to the technical field of oil drilling and production equipment, in particular to an anti-slag cap used for shallow water underwater wellheads and Christmas trees. Background technique [0002] The subsea tree is widely used in the exploitation process of subsea oil and gas fields, and it is an extremely important equipment in the process of drilling, completion and oil production. [0003] However, in the process of drilling, completion and oil production, cuttings and seabed slag often fall into the tree body, and marine organisms adhere to the HUB surface and metal sealing surface of the wellhead body and the top of the tree body, resulting in the failure of the wellhead body and the tree body. Internal seawater is prone to corrosion and scaling problems. [0004] Therefore, it is necessary to study a new anti-slag cap to solve the above problems. Contents of the invention [0005] In view of the above problems, the object ...

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Problems solved by technology

[0003] However, in the process of drilling, completion and oil production, cuttings and seabed slag often fall into the tree body, and marine organisms adhere to the HUB surface and metal sealing surface of the wellhead body and the top of the tree body, resulting in the failure of the wellhead body and the tree body. Internal seawater is prone to corrosion and scaling problems

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