Method of replacing seals in ram type blow out preventers

Details Method of replacing seals in ram type blow out preventers Method of replacing seals in ram type blow out preventers

E - Fixed Constructions

21

B

166/50

E21B 33/035 (2006.01) E21B 33/06 (2006.01)

Patent

CA 1050419

A B S T R A C T This invention relates to the replacement of seals in ram type blow out preventers and is especially useful for replacing such seals where the well head is at a considerable distance from the drill head, for example on the sea bed. The method comprises removing a seal from a first blow out preventer ram in situ at the lower end of the well riser, and inserting a replacement shoe of smaller internal diameter itself fitted with a seal within the seal recess of the first ram. There is disclosed a shoe for a ram type blow out preventer comprising a part annular member having a part cylindrical outer surface provided with a ridge for receipt in a recess in a blow out preventer ram, means for indexing and securing the part annular member relative to the blow out preventer ram, and a seal receiving recess in the radially inner surface of the part annular member.

300464

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