What is the function of a blowout preventer (BOP) annular preventer compared to a ram preventer?
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A
Annular preventers seal only around drill pipe; ram preventers seal any wellbore geometry
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B
Annular preventers use rubber elements to seal around any pipe size or open hole; rams seal specific pipe sizes or close the bore
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C
Both perform identical sealing functions
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D
Annular preventers are only used offshore; rams are used onshore