Double rubber core annular blowout preventer

Abstract

A double-rubber-core annular blowout preventer comprises a flanged base, a lower pressing cover, a lower wear-resistant ring, a lower outer rubber core, a lower inner rubber core, a lower piston head, a lower mud scraping disc, a lower support frame, a lower support cylinder, a lower piston rod, a balancing manifold, an upper piston rod, an upper support cylinder, an upper support frame, an upper piston head, an upper end cover, an upper mud scraping disc, an upper pressing cover, an upper wear-resistant ring, an upper outer rubber core, an upper inner rubber core, an outer shell body, a pressure relieving manifold and a coupling detector. The upper inner rubber core and the lower inner rubber core adopt pressing-block-type structures, hydraulic oil provided by an external hydraulic system enters a space among the upper piston rod, the lower piston rod and the outer shell body, the upper outer rubber core and the lower outer rubber core are squeezed to expand in the radial direction, further the upper inner rubber core and the lower inner rubber core of the blowout preventer tightly hold a tubular column, the effect of sealing tubular column annulus is achieved, and meanwhile a tubular column coupling does not need to pass forcibly with cooperation of the tubular column coupling detector. According to the double-rubber-core annular blowout preventer, wellhead pressure can be sealed when the tubular column is removed under pressure under the conditions that well control and blowout prevention are not conducted.

Description

Technical field: [0001] The invention relates to the field of oil field wellhead well control equipment, in particular to a blowout preventer suitable for the working condition of the pipe string under pressure when it is specially used for workover, fracturing, water injection and other operations, and especially relates to a double rubber core annular blowout preventer device. Background technique: [0002] As a new type of downhole operation technology, snubbing operation can carry out downhole operations such as workover and stimulation measures under the condition of oil and gas pressure in the wellbore. During the snubbing operation, there is no need to circulate and kill hydraulic wells, and no blowout overflow is required. , which shortens the operation cycle and reduces the damage to the formation, protects the productivity of the oil well, and reduces the secondary operation cost after the workover operation of the oil well. [0003] The existing snubbing operatio...

AI Technical Summary

Problems solved by technology

[0003] The existing snubbing operation device adopts the spherical rubber core in the annular blowout preventer to tightly hold the inner well tubing string to seal the wellhead when the tubing string is pulled up at the wellhead. The rubber core of the annular blowout preventer leads to serious wear of the rubber core. It is necessary to replace a rubber core for every well operation, and the price of the rubber core is very expensive. Especially in the process of high-pressure workover, the rapid wear of the rubber core increases the occurrence of blowout The possibility of serious threat to the safety of workers

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