Environment-friendly closed rotary blowout preventer for unbalanced drilling

Abstract

The invention discloses an environment-friendly closed rotary blowout preventer for unbalanced drilling. The rotary blowout preventer is composed of a rotating assembly (1) and a shell (2). The rotating assembly (1) is installed on the shell (2) through sealing rings (3) to form the environment-friendly closed rotary blowout preventer for unbalanced drilling on the whole. A shell body (4) of the shell (2) is provided with two grooves spaced by 150 degrees. A shell (36) of the rotating assembly (1) is provided with two bosses spaced by 150 degrees. In this way, the uniqueness of the installing angle between the shell (2) and the rotating assembly (1) is guaranteed. The sealing rings (3) are used for sealing the sealing surfaces between the rotating assembly (1) and the shell (2). By adoption of the environment-friendly closed rotary blowout preventer for unbalanced drilling, mud carried by a drill stem from a well is sealed within the interior of the rotary blowout preventer, accordingly the mud is prevented from falling into a well opening, and the environment surrounding the well opening is effectively protected.

Description

technical field [0001] The invention relates to a mechanical device, in particular to an environmentally friendly closed rotary blowout preventer for underbalanced drilling used in petroleum underbalanced drilling. Background technique [0002] The underbalanced drilling technology has developed maturely, and its effects in discovering and protecting oil and gas layers and improving drilling speed have also been recognized. With the rapid development of the petroleum industry, underbalanced drilling technology has been regarded as a preferred technology in the field of petroleum drilling. At the same time, the state vigorously promotes environmental improvement, which puts forward higher requirements for the production equipment of the petroleum industry. [0003] At present, the rotary blowout preventer used at home and abroad has the problem of polluting the environment during use. Specifically, during the tripping process, when the drill pipe goes from the bottom of the...

AI Technical Summary

Problems solved by technology

[0003] At present, the rotary blowout preventer used at home and abroad has the problem of polluting the environment during use.

Specifically, in the process of pulling out the drill pipe, when the drill pipe goes from the bottom of the well to the platform, the mud in the well will be taken out of the wellhead by the drill pipe and fall on the ground and platform, causing great pollution to the surrounding environment.

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