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Wellhead suspension device

A suspension device and casing technology, which is applied in the direction of wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of low pressure bearing capacity of the wellhead, safety problems, welding quality can not be guaranteed, etc., to reduce the well The effect of controlling risks and improving sealing performance

Pending Publication Date: 2020-02-18
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are safety problems when the annular steel plate is connected to the oil pipe, and the welding quality cannot be guaranteed. The pressure bearing capacity of the wellhead is much lower than the original wellhead suspension device, and there are hidden dangers in well control safety

Method used

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  • Wellhead suspension device

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Embodiment Construction

[0037] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The embodiment of the present invention provides a wellhead suspension device, as attached figure 1 As shown, the device includes: fastener 1, gland 2, cone 3, housing 4, first seal 5, grease nozzle 6, first gasket ring 7, second seal 8, second gasket Ring 9 and casing collar 10.

[0039] The inner wall of the housing 4 is provided with concave steps along the circumferential direction, and the second backing ring 9, the second sealing member 8, the first backing ring 7, the first sealing member 5, and the cone 3 are sequentially embedded in the concave steps o...

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Abstract

The invention provides a wellhead suspension device, and belongs to the field of oil well equipment. The wellhead suspension device comprises a fastener, a gland, a cone, a housing, a first sealing piece, a grease injection nozzle, a first backing ring, a second sealing piece, a second backing ring and a casing coupling, wherein a concave step is arranged on the inner wall of the housing in the circumferential direction; the second backing ring, the second sealing piece, the first backing ring, the first sealing piece and the cone are sequentially inlaid in the concave step on the inner wall of the housing; the grease injection nozzle is arranged on the outer wall of the housing and communicates with the first backing ring; the fastener is detachably connected with the gland and the housing; the casing coupling is connected with a casing; and the inner walls of the cone, the first sealing piece, the first backing ring, the second sealing piece and the second backing ring abut against the outer wall of the casing. According to the wellhead suspension device, the wellhead casing suspension sealing requirement is met, meanwhile, the pressure bearing capacity of a wellhead is the sameas that of an original wellhead device, and the well control risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil well equipment, in particular to a wellhead suspension device. Background technique [0002] With the extension of time, the production well casing is corroded by surface water at the bottom of the well, and after the operation damage caused by the change of rock stress, deformation, corrosion and perforation will occur, resulting in the shutdown and production reduction of the oil well and the loss of well control. Therefore, the failed casing needs to be replaced. When replacing the failed casing downhole, it is necessary to replace the wellhead and remove the original wellhead suspension devices, such as annular steel plates and casing head hangers. The sealing performance of the removed wellhead suspension device is damaged, and there are hidden dangers in well control safety. Therefore, it is necessary to provide a wellhead suspension device that does not have the problem of well control safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/04
CPCE21B33/04
Inventor 王健
Owner PETROCHINA CO LTD
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