... with ram BOP and also independently.1, It can seal any size of annular space with a kind of ... there is no drilling tool in hole, it can seal the well head completely.3, When the well blowout ... happens during drilling, coring or well logging, it can seal the annular spaces between Kelly, coring tools, cable, ... regulating valve or a cushion accumulator, it can force stripping with 18° tool joint. ram bop