Combined annular blowout preventer

An annular blowout preventer and combined sealing technology, applied in the field of workover equipment and oil drilling, can solve the problems of high maintenance and use cost, inconvenient use, complex structure, etc. Effect

Inactive Publication Date: 2010-05-12
BAOJI PETROLEUM MASCH CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a combined annular blowout preventer, which solves the problems of complex structure, inconvenient use, and high maintenance and use costs in the prior art, and realizes forced start-up under pressure without well suppression or blowout release. Seal the wellhead while running the string

Method used

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Such as figure 1 , the structure of the device of the present invention is, comprises lower casing 1 and upper casing 11, is connected by screw rod I 10 between lower casing 1 and upper casing 11, and lower casing 1 is provided with annular ring toward one end of upper casing 11. Groove, the piston 2 with S-shaped cross section is installed in the annular groove, the combined sealing ring I 3 is arranged between the piston 2 and the outer ring contact surface of the lower housing 1, and the inner ring of the piston 2 and the lower housing 1 A combined sealing ring II 4 is arranged between the contact surfaces, and a dustproof ring 7 is arranged between the contact surface of the piston 2 and the upper casing 11, and the dustproof ring 7 and the upper casing 11 are combined by grooves and ribs , to ensure that the position is relativel...

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Abstract

The invention discloses a combined annular blowout preventer, which comprises a lower shell and an upper shell, wherein the lower shell is connected with the upper shell through a screw rod I; a piston is arranged in an annular groove of the lower shell facing one end of the upper shell; a combined sealing ring I is arranged between the piston and the lower shell; a combined sealing ring II is arranged between the piston and the lower shell; a dust-proof ring is arranged between the piston and the upper shell; a combined sealing ring III is arranged between the dust-proof ring and the piston;a sealing ring I is arranged between the dust-proof ring and the lower shell; a sealing ring II is arranged between the dust-proof ring and the upper shell; the inner surface of the lower section of the upper shell is provided with a spherical rubber core; the inner surface of the upper section of the upper shell is provided with a cylindrical rubber core I and a cylindrical rubber core II; a Malone set assembly is arranged at the collar extension of a through hole at a cylindrical groove of the upper shell; and the upper port of the upper shell is provided with an end cover. The blowout preventer of the invention has a simple and compact structure, convenient operation, safety and reliability, low use and maintenance cost, and high working efficiency of drilling a well or repairing the well.

Description

technical field [0001] The invention belongs to the technical field of oil drilling and workover equipment, and relates to a combined annular blowout preventer. Background technique [0002] Snubbing technology has attracted more and more attention in oil and gas exploration and development because of its high operating efficiency, effective formation protection, and environmental protection. The existing snubbing operation device can only be realized by the continuous opening and closing of the rams of the single ram blowout preventer and the double ram blowout preventer when the pipe string is forcibly tripped under pressure at the wellhead. The operation is very slow and requires It is equipped with a special well fluid discharge and recovery system; there is also a snubbing operation device, which uses the spherical rubber core in the annular blowout preventer to embrace the inner well pipe string and seal the wellhead, so as to realize the forced tripping operation of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/06
Inventor 杨建武邓平卢韵皎王定亚张丰功
Owner BAOJI PETROLEUM MASCH CO LTD
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