Device for pressure conversion and sealing of wellhead
A wellhead pressure and pressure technology, which is applied in the field of wellhead pressure conversion and sealing devices, can solve problems such as the inability to realize wellhead pressure conversion.
Active Publication Date: 2018-09-28
PETROCHINA CO LTD
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Problems solved by technology
[0004] In the prior art, "A Sucker Rod Blowout Prevention Device" provided by 201520644059.4 is generally used to emergency shut down the blowout or overflow of the sucker rod when it is tripped. It is a one-time well shut-in operation when a blowout or overflow emergency occurs, and the wellhead pressure conversion cannot be realized
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[0029] To clarify, when a component is said to be "set on" another component, it can be directly on the other component or there can be an intervening component as well. When a component is said to be "connected" to another component, it can be directly connected to the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are based on the drawings of the specification for the purpose of illustration and do not represent the only embodiment.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application. As used herein, the term "and / or" includes any and all co...
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The invention provides a device for pressure conversion and sealing of a wellhead. The device comprises a pressure conversion body, a first sealing mechanism and a second sealing mechanism. The pressure conversion body is provided with a pressure conversion channel allowing hollow nipples to penetrate; the first sealing mechanism is arranged on the outer wall of the pressure conversion body and comprises a plurality of first pipelines extending transversely, the multiple first pipelines communicate with the pressure conversion channel and are internally provided with first sealing plugs correspondingly, and the first sealing plugs can move in the corresponding first pipelines; and the second sealing mechanism is arranged on the outer wall of the pressure conversion body and located below the first sealing mechanism, and comprises a plurality of second pipelines extending transversely, the multiple second pipelines communicate with the pressure conversion channel and are internally provided with second sealing plugs correspondingly, and the second sealing plugs can move in the corresponding second pipelines. The device for pressure conversion and sealing of the wellhead can achievepressure conversion and sealing of the wellhead effectively and continuously in the dynamic pull-up and putting-down operation process of the hollow nipples.
Description
technical field [0001] The present application relates to the technical field of oil and gas production, in particular to a device for wellhead pressure conversion and sealing. Background technique [0002] The descriptions in this section merely provide background information related to the disclosure in this application and may not constitute prior art. [0003] In the process of steam injection in oil wells to establish oil fishing channels, there is generally construction pressure in the wellbore. The steel hollow sub-joints installed during construction are about 4 meters long and need to be connected by couplings. However, the outer diameter of the hollow sub-joint is not consistent with that of the coupling. In order to achieve effective management and control of safety and environmental risks during the construction process, it is necessary to use a device that can not only establish a closed passage, but also keep the inside of the well during the dynamic operation ...
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IPC IPC(8): E21B33/03
CPCE21B33/03
Inventor 郭明刚郭政曈张秋爽李晖李皓楠凌遗文全振牛志东毛哲李雪松孟繁举
Owner PETROCHINA CO LTD