Large-diameter single-double quick-change rotary blowout preventer assembly

Abstract

The invention discloses a large-diameter single-double quick-change rotary blowout preventer assembly. The assembly comprises a driving assembly, an upper rubber core rotating assembly and a lower rubber core rotating assembly detachably connected with the bottom of the upper rubber core rotating assembly, wherein the upper rubber core rotating assembly comprises an upper central shaft protectivesleeve, an upper rubber core outer shell, an upper rubber core, an upper rubber core framework, an upper rubber core driving hanger and an upper rubber core sealing gland. The large-diameter single-double quick-change rotary blowout preventer assembly gives consideration to the large-diameter central shaft size and the high-dynamic sealing pressure, on the premise of ensuring that a central shaftdiameter is unchanged, quick change of a high-pressure double-rubber-core assembly and a low-pressure single-rubber-core assembly can be realized, meanwhile, a connection mode of the rubber core hanger and a sealing rubber core, a connection mode of the upper rubber core sealing gland and the upper rubber core outer shell as well as a fixing mode of a rotary sealing bushing are improved, the situation that equipment sealing failure caused by screw thread loosening and sealing bushing abrasion due to vibration can be effectively prevented, and the assembly is compact and simple in structure, convenient in on-site disassembly and assembly, and high in practicability.

Description

technical field [0001] The invention relates to the technical field of blowout preventers, in particular to a large-diameter single-double quick-change rotary blowout preventer assembly. Background technique [0002] Rotary blowout preventer is one of the core equipment for implementing underbalanced (liquid phase, gas phase) drilling, managed pressure drilling and other drilling technologies. Its main function is to realize the rotary sealing and drilling of drilling tools under certain wellhead pressure conditions. Generally, the passive rotary blowout preventer is mainly composed of a rotary assembly, a shell, and a clamp, among which the rotary assembly is the main component of the rotary blowout preventer and an important component to realize the rotary sealing of the drilling tool. [0003] The rotating assembly of the rotating blowout preventer currently used is generally divided into a high-pressure double-rubber core assembly and a low-pressure single-rubber core a...

AI Technical Summary

Problems solved by technology

[0005] During the field operation, due to the rotation of the drilling tool and the vibration of the wellhead, it is easy for the upper rubber core shell and the upper rubber core sealing gland of the high-pressure double rubber core rotary assembly to buckle or loosen, and the rubber core hanger and the rubber core sticker The phenomena such as the loosening of the bolts on the mating surface will lead to the failure of the seal of the rotating assembly, the wear and tear of the mandrel, and other unexpected situations such as scrapping

[0006] In addition, the conventional rotating BOP assembly usually uses threads to connect the wear-resistant dynamic sealing bushing to the mandrel of the rotating assembly, and then realizes dynamic sealing with the dynamic sealing assembly. If the sleeve is tripped or loose, it is usually fixed by solder joints and sealant. With the accumulation of use time, the sealing surface of the wear-resistant dynamic seal bush will gradually wear away and cause the dynamic seal to fail. Disassemble and replace the dynamic seal bush. When the sleeve is installed, special tools or special treatment are required. Due to the limitation of site conditions, forced treatment may damage the mandrel and sealing components, resulting in damage or scrapping of the bearing. It can only be returned to the factory for repair, which affects the construction progress, long maintenance cycle, and transportation costs. high

The Chinese patent with the publication number CN209494545U provides a rotating assembly of an easy-to-disassemble rotary blowout preventer, which changes the space between the upper rubber core connection seat and the upper rubber core installation cylinder, the upper rubber core installation cylinder, and the upper dynamic sealing sleeve. The connection between the mandrel and the mandrel and the mandrel, the lower dynamic sealing sleeve and the lower rubber core mounting seat can alleviate the above technical problems to a certain extent, but the sealing rubber core and the rubber core hanger The thread pre-tightening method is still used for connection and sealing, and the dynamic sealing bush and the center shaft are still fixed with screws. Once the thread is loose or the thread head is worn, the sealing gland of the upper rubber core and the suspension of the sealing rubber core may still occur. The failure of the seal of the device, the difficulty of disassembling and assembling the equipment, etc.

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