Blowout preventer stacks typically include annular BOPs and ram BOPs. Annular BOP (also called bag type, spherical or universal preventer) was introduced to the industry in 1946 by Granville Sloan Knox. It is the most versatile piece of equipment on the BOP stack since it can close around the casing, drill pipe, drill collars, wireline and even close an open hole. The rubber packing elements of the annular preventers, which allow this flexibility, are also subject to wear and abuse. Treated properly, the packing unit of the annular preventer has a long, reliable life span, but it can be destroyed in a very short time or very few closing cycles by improper use.
Those devices force circular steel-reinforced rubber elements to close on and create a seal around drill pipe or other tools that may be in the wellbore at the time of shut-in. When annular BOPs are shut in around a pipe, the pipe may be moved up or down or rotated without breaking the seal. Designed to prevent flow up the casing-drill pipe annulus, annular BOPs are also able to seal a clear wellbore in which no obstruction is present although doing so reduces the rated working pressure of the sealing element by 50%. Vigor's annular BOP is designed and manufactured to API Specification 16A for Drill Through Equipment. Meanwhile, it is available in all standard bore and pressure rating.
Ram BOPs include rubber-faced steel rams that are brought together to create a seal or, like annular BOPs, form a seal around a tool in the wellhead. Shear rams are high-strength hydraulically powered rams that are able to sever drill pipe. They include casing shear rams and blind shear rams. Both are designed to cut drill pipe or other obstructions in the well. Blind shear rams can completely seal the well. Casing shear rams, while not able to form a seal, typically are able to cut larger size tubulars than those that blind shear rams can cut.
Drillers use a control system to actuate rams that is comprised of accumulator bottles containing pressurized hydraulic fluid, a hydraulic fluid storage reservoir, a pumping system and hydraulic piping. The hydraulic fluid is directed to a desired function on the BOP stack via a remote-control panel. Sealing against high pressure and cutting through drill pipe require significant force. Blowout preventer rams are forced closed and reopened using hydraulic power that is stored and ready for use at all times during drilling and completion operations in an accumulator system. An accumulator consists of cylinders containing hydraulic fluid under high pressure. The hydraulic fluid is directed to the BOP rams to drive them to close or open against well pressure.
Vigor's annular BOP and ram BOP strictly follow API 16A standard for designing and manufacturing. The BOP manufactured by Vigor has become known for its high quality and stable products in the oil and gas industry. Our technical team is constantly improving to provide customers with better products. Zero quality complaint has always been Vigor's working principle. If you are willing to work with us, please contact us as soon as possible to get more professional service.
For more information, you can write to our mailbox:
info@vigorpetroleum.com (Erica)
mail@vigorpetroleum.com (Joppa)
