Method for replacing gas recovery wellhead device
A wellhead device and gas production technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve problems such as large safety risks and inability to deal with wellhead failures, and reduce operational safety risks and reliability High and fast recovery effect
Inactive Publication Date: 2016-08-17
PETROCHINA CO LTD
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Problems solved by technology
The temporary plugging process has achieved certain results in replacing the gate valve of the wellhead device in Changqing Gas Field, but this process is implemented in the wellhead under pressure, which has a large safety risk and cannot deal with the leakage of the body of the wellhead device and casing head, etc. For complex wellhead faults, only the gate valve and other components of the wellhead device can be dealt with
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[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0033] Gas production wellhead device: all permanent equipment between the uppermost part of the wellhead surface casing and the reducer of the tubing head, including: casing head casing, casing head spool, tubing head spool, conversion spool, connection device etc.
[0034] figure 1 It is a flow chart of an embodiment of the method for replacin...
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The invention provides a method for replacing a gas recovery wellhead device. The method for replacing the gas recovery wellhead device comprises the following steps of feeding a fishable tubing bridge plug into a gas recovery tubing string for sealing and blocking the gas recovery tubing string and blocking an overflowing passage of an underground gas flow from the gas recovery tubing string; sealing and blocking an oil jacket annular space by a hanging packer so as to block an overflowing passage of the underground gas flow from the oil jacket annular space; and replacing the gas recovery wellhead device. The method has the advantages that complicated faults such as gas recovery wellhead device body and casing head seepage, of the gas recovery wellhead device, can be treated; the operation safety risk is reduced; and the reliability is high.
Description
technical field [0001] The invention relates to well completion technology in oil and gas fields, in particular to a method for replacing gas production wellhead devices. Background technique [0002] At present, in the maintenance and replacement of gas production wellhead devices in Changqing Gas Field, the temporary plugging method is mainly used to deal with wellhead failures. Temporary plugging is to use mechanical or temporary plugging fluid to temporarily block the wellhead and the inside of the gate valve, and replace the gate valve of the wellhead device. The temporary plugging process has achieved certain results in replacing the gate valve of the wellhead device in Changqing Gas Field, but this process is implemented in the wellhead under pressure, which has a large safety risk and cannot deal with the leakage of the body of the wellhead device and casing head, etc. For complex wellhead failures, only gate valves and other components of the wellhead device can be...
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IPC IPC(8): E21B33/03
Inventor 胡相君邵媛李旭梅王尚卫白小佩张安康郭思文
Owner PETROCHINA CO LTD