Wells – Above ground apparatus – With assembly or disassembly means
Patent
1974-12-26
1977-01-18
Cohan, Alan
Wells
Above ground apparatus
With assembly or disassembly means
29235, 29451, 166 558, 277 95, E21B 3306
Patent
active
040034305
ABSTRACT:
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.
The invention also relates to apparatus for indexing and mounting a blow out preventer receiving shoe on a blow out preventer ram and to apparatus for cutting a seal from a ram to leave a recess for the receipt of a shoe.
REFERENCES:
patent: 3272222 (1966-09-01), Allen
patent: 3583480 (1971-06-01), Regan
patent: 3737974 (1973-06-01), Mott
patent: 3821838 (1974-07-01), Mott
Cohan Alan
Gerard Richard
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