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Company News
Dec. 16, 2022
Due to the many and complex uncertain factors in the formation, every drilling operation has the possibility of a blowout, which puts forward higher requirements for well control technology and well control equipment. As the most important well control equipment, the blowout preventer needs to be quickly activated to shut down the well in case of overflow, well kick, blowout, and other emergency situations during drilling operations. Once the BOP fails, it will lead to blowouts and other malignant accidents. Therefore, the reasonable design of blowout preventers plays an important role in ensuring the smooth progress of drilling operations and personal safety.
The blowout preventer is a safety sealing wellhead device commonly used in oilfields to prevent blowouts. It is used to close the wellhead during oil testing, workover, well completion and other operations to avoid blowout accidents. It combines the functions of full sealing and semi-sealing into one , has the characteristics of simple structure, easy operation, high-pressure resistance, etc.
Blowout preventer is the most important well control device, which plays an important role in drilling, especially underbalanced drilling. The common hydraulic blowout preventer mainly has two types: Annular BOP and Ram BOP.
Designed for safe good pressure control during drilling and workover operations, the Annular BOP is a large valve designed to seal, control and monitor oil and gas wells. The valve rotates during drilling to maintain a seal around the drill pipe. The Annular BOP helps to maintain a good seal on the oil to prevent catastrophic blow-outs. The Annular BOP comprises a valve body, upper housing, sealing elements, dust ring, and piston. These blowout preventers have a resilient seal, a type of valve similar to a large rubber ring, which can be mechanically squeezed inwards to seal the drill column, casing, bare borehole, or pipe. It provides a robust, reliable blowout preventer and is easy to maintain, and is widely used offshore (subsea and surface) and onshore.
A ram BOP is a blowout preventer that uses a pair of steel plungers that oppose each other rams. The Ram BOP consists of two halves of a borehole cover that are separated from the middle. A large-diameter hydraulic cylinder, usually retracted, forces the two halves of the cover together in the middle to seal the borehole. These covers are made of steel for strength and are fitted with elastomeric components on the sealing surface.
Ram BOP can be equipped with different types of rams, such as pipe ram, blind ram, shear ram or variable diameter ram, to meet different applications.
In oil and gas drilling engineering, in order to drill through the high pressure oil and gas reservoir and avoid the drilling spray accident, it is necessary to install the drilling control device at the drilling port. When the pressure in the wellbore is lower than the formation pressure, the oil, gas, and water in the downhole formation enter the wellbore and form overflow or well kick. In severe cases, drilling blowouts and fire accidents may occur.
In normal drilling operations, the primary well control is the hydrostatic pressure exerted by the drilling fluid in the well. This pressure can be adjusted by changing the fluid density to suit specific conditions.
If a major loss of control occurs due to a sudden increase in formation pressure or lost circulation, it may be necessary to shut down the well by other means to prevent the uncontrolled flow of formation fluids or blowout.
The function of the drilling blowout preventer is to quickly and timely close the wellhead when there is an overflow or kick in the well to prevent blowout accidents. The blowout preventer needs to meet the requirements of the drilling process, be reliable, easy to operate, and can quickly close and open the wellhead. It can be controlled not only on the drill console of the drilling rig, but also on a remote console far away from the wellhead. The device should have a certain pressure capacity to achieve controlled blowout, well killing and tripping of drilling tools.
If you have a drilling project, please consider Rongsheng Machinery Manufacture! We are a comprehensive petroleum machinery manufacturing enterprise integrating product R&D and manufacturing, equipment integration and support, and engineering services. We are not only the first-tier supplier of BOP for drilling and workover of CNPC, but also the world's leading manufacturer of land BOP in production and sales.
Contact us to learn about other types of BOP!