Annular BOP
Annular BOP : (n.) Drilling. A large valve used to control wellbore fluids. In this type of valve, the sealing element resembles a large rubber doughnut that is mechanically squeezed inward to seal on either pipe (drill collar, drillpipe, casing, or tubing) or theopenhole. The ability to seal on a variety of pipe sizes is one advantage the annular blowout preventer has over the?ram blowout preventer. Most blowout preventer (BOP) stacks contain at least one annular BOP at the top of the?BOP stack, and one or more ram-type preventers below. While not considered as reliable in sealing over the openhole as around?tubulars, the elastomeric sealing doughnut is required by?API?specifications to seal adequately over the openhole as part of its certification process. Syn: Annular Blowout Preventer. See: Blowout Preventer, Snubbing, Stripping
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