E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/44
E21B 7/12 (2006.01) E21B 17/01 (2006.01) E21B 21/00 (2006.01) E21B 21/10 (2006.01) F16K 31/126 (2006.01)
Patent
CA 1248443
ABSTRACT A marine riser safety valve is disclosed which, when placed in series with a deep water marine riser string, prevents collapse of riser pipe when in- advertent gas influx replaces the drilling fluid column. A cylindrical body is provided having a depression formed therein with at least one diaphragm port from the central bore of the body through the wall of the depression. A valve port is provided axially from the depression. A cylindrical member including a cylindrical diaphragm and a valve sleeve are joined end-to-end. The cylindrical member is disposed about the exterior of the body with the elastomeric diaphragm covering the depression and the valve sleeve covering the valve port. When a dif- ferential pressure develops across the wall of the diaphragm of a predetermined threshold, the diaphragm constricts into the body depression and moves the valve sleeve axially, opening the valve port to permit sea water influx. An outer skirt is provided to prevent outward ballooning of the diaphragm when bore pres- sure is greater than the surrounding sea water pres- sure.
503063
Hewitt Neville S.
Hydril Company
LandOfFree
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