One way shear blowout preventer

Abstract

The invention provides a one way shear blowout preventer which comprises a shell body of a blowout preventer. The shell body is internally provided with a channel communicating with a mouth of a welland the channel is used for connecting to the mouth of the well or a vertical pipe. Holes are formed in two sides of the shell body correspondingly to provide motion channels of shear flashboards. Each side of the shell body is provided with one or multiple hydraulic cylinders which are fixedly connected with the shell body. Power is provided to the shear flashboards by hydraulic pressure pullinga piston. The two sides of the shell body can be provided with hydraulic cylinders in series to increase shear force. The power to connect the hydraulic cylinders in series can adopt the hydraulic pressure or seawater. The blowout preventer is different from the method of a traditional blowout preventer which both sides of flashboards simultaneously extrude and shear inward. Single flashboard andone face shear are adopted. The shell body bears the shear counter-force. Pistons on both sides of the blowout preventer are pushed and pulled in the same direction. According to the one way shear blowout preventer, a novel blowout preventer structure is adopted, and a special flashboard is designed, so that in the same condition, all the functions of the traditional shear flashboard blowout preventer are processed, and the shear ability is increased in multiples.

Description

technical field [0001] The invention relates to a blowout preventer in the field of marine engineering, in particular to a one-way shear blowout preventer. Background technique [0002] Ram blowout preventer (BOP) is the most important well control equipment in the drilling and completion process of oil production. The main features of the ram blowout preventer: First, the ram has strong sealing ability and high reliability, high pressure resistance, and can be used for a long time. Keep the closed state and close the wellhead at all times; second, the blowout preventer can be equipped with rams to close various specifications and types of drill pipes, casings, and oil pipes, and can also be equipped with fully-sealed rams to close empty wells, and equipped with shear drills in emergency situations. Shear ram for rod. [0003] The shear ram blowout preventer is a type of ram blowout preventer. It is mainly used in emergency situations during drilling and workover operations...

AI Technical Summary

Problems solved by technology

[0004] The existing ram BOP has insufficient shear force, and can only cut ordinary drill pipes under limited conditions. For special drilling tools, such as drill pipe joints, drill collars, and weighted drill pipes, more and more high-strength drill pipes will be used in the future. Drill pipes, etc. cannot be guaranteed to be sheared. In addition, shearing of drill tools that have been deformed or offset cannot be guaranteed. The industry has an urgent demand for high-performance shear ram blowout preventers.

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