Wellhead assembly and method of operation thereof

A wellhead device and channel technology, which is applied in the direction of wellbore/well valve device, earthwork drilling and production, wellbore/well components, etc., can solve the problems of frequent pressure emergencies and high risks, so as to improve efficiency and reduce engineering accidents , The effect of saving operating time and cost
CN107313748BActive Publication Date: 2019-06-11PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2019-06-11

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Abstract

The invention discloses a wellhead device and an operation method thereof and relates to the technical field of oil and gas exploitation. The wellhead device comprises a shell, an upper connector, a setting nipple and a packer; a first channel is formed in the shell, and an opening-closing mechanism for controlling opening and closing of the first channel is arranged on the first channel; the upper connector is connected with the shell, a second channel connected with the first channel is formed in the upper connector, a third channel and a fourth channel are further formed in the upper connector, a second valve is arranged on the third channel, and a pressure gauge is connected to the fourth channel; the lower end of the upper connector is sleeved with part of the setting nipple, an annular space is formed between the setting nipple and the upper connector and communicates with the third channel and the fourth channel, a through hole communicating with the annular space is formed in the side wall of the setting nipple, and a blocking part is arranged on the inner wall of the setting nipple so as to close the lower end of the annular space; and the packer is arranged outside the setting nipple. According to the wellhead device and the operation method thereof, replacement work of a steam-injection wellhead can be completed in a controllable state.
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Description

technical field

[0001] The invention relates to the technical field of oil and gas exploitation, in particular to a wellhead device and an operating method thereof. Background technique

[0002] During the development of oil wells, due to the long-term development and the high temperature during the development process, a certain number of steam injection wellheads will be damaged to varying degrees every year, and corresponding treatment operations are required according to the degree of damage. Generally, it can include maintenance such as replacing valves or directly replacing the wellhead.

[0003] However, in the process of replacing the wellhead, due to the high temperature at the bottom of the steam injection well, the pressure is generally high, and there are many pressure emergencies, the risk is high during the operation of replacing the wellhead. wellhead device. Contents of the invention

[0004] At present, the applicant finds that there is no special tool f...

Claims

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