Dual-rotating-cylinder dual-plunger sliding key type shaft plug core trinity blowout preventer

Abstract

The invention provides a dual-rotating-cylinder dual-plunger sliding key type shaft plug core trinity blowout preventer. The preventer is applied to oil and gas mining well repair blowout preventing work. An upper plug core sliding way and a lower plug core sliding way of a shell assembly are matched with an upper polish rod blowout preventing mechanism and a lower pumping rod blowout preventing mechanism correspondingly, a side door type rotating motion cylinder is adopted on a rotating cylinder shaft base, according to a spiral transmission pair and a dual-column-face rotating pair, spiral transmission is implemented, rotation motion of a rotating cylinder body is converted into axial moving of a transmission shaft, an upper shaft plug core assembly and a lower shaft plug core assembly adopt cylindrical piston type and shaft plug core trinity structures and serve as a seal assembly and a transmission assembly of the blowout preventer, the upper shaft plug core assembly and the lowershaft plug core assembly carry out precise sliding according to a dual-plane moving pair and a dual-piston moving pair, through a sliding key limiter, axial and circumferential limiting is finished, apolish rod and a pumping rod in a diameter rod penetrating hole are clamped, and closed type seal rubber core and three-O-shaped seal ring combined type non-metal seal and wellhead blowout preventingwork can be achieved.

Description

Technical field [0001] The invention relates to a blowout preventer for conventional oil and gas and unconventional oil and gas exploitation and workover operations, in particular to a three-in-one blowout preventer with a shaft plug core adopting a double rotating cylinder, a double plunger and a double sliding key. Background technique [0002] During workover operations in conventional and unconventional oil and gas production, the technical performance and on-site adaptability of wellhead blowout preventers are the key to well control management. Among the wellhead safety blowout preventers commonly used in oilfield workover operations at home and abroad, self-sealing and full The functions of sealing and semi-complete sealing blowout preventers are realized separately. [0003] The typical wellhead safety blowout prevention devices of foreign companies include Cameron’s blowout preventer with radial combined seal, Hydril’s blowout preventer with piston self-tightening seal, Sh...

AI Technical Summary

Problems solved by technology

[0009] In order to effectively solve the wellhead out-of-control problem during the workover operation of conventional oil and gas and unconventional oil and gas production, and overcome the defects and deficiencies of the existing wellhead blowout prevention technology and its blowout preventer, the purpose of the present invention is to provide a suitable oil and gas production workover Three-in-one blowout preventer with double-rotor and double-plunger feather key type shaft-plug-core for well operation

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