E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/50
E21B 33/06 (2006.01)
Patent
CA 1193543
ANNULAR BLOWOUT PREVENTER Abstract of the Disclosure An annular blowout preventer having a housing with a vertical bore therethrough, a packer within the housing including a resilient annulus and upper and lower series of irising metal inserts adapted to increase the support for the annulus when it is deformed axially and extended radially to constrict the vertical bore, a support ring in the annulus under the outer ends of the irising metal inserts to support against upward movement of the inner ends of the inserts on closing of the annulus and an annular piston movable in the housing to apply an axial deformation load to the packer to move it to closed position sealing the bore. Background Blowout preventers are used to control pressure within oil and gas wells during drilling and completion. Annular blowout preventers, the type to which the present invention relates, include a single annular resilient packing positioned within a body having means to cause the packing to move into sealing engagement with a portion of a pipe string extending through the preventer or against itself to seal a well when no pipe string extends through the preventer. An annular blowout preventer is shown and described in U.S. Patent No. 3,572,627 to Jones et al. The packer has a resilient annulus with a circular series of rigid inserts extending through the packer and having irising end flanges on both ends which move to provide end support for the resilient annulus when it is compressed radially inward by pistons. The pistons are positioned around the resilient annulus to provide an inwardly directed radial force on the resilient annulus. Other annular preventers have utilized an axial deformation of
418513
Church Richard M. Jr.
Williams Bolie C. III
Cameron Iron Works Inc.
Smart & Biggar
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