Annular BOP is an important part of well control equipment. 1. Style: Shaffer, Cameron, Hydril 2. Standard: API 16Aram bopAnnular BOP ... . It is usually used with ram BOP and also independently.1, It can seal any size of annular space with a ... , it can seal the well head completely.3, When the well blowout and overflow happens during drilling, coring or well logging, it can seal ...