Annular blowout preventer

Details Annular blowout preventer Annular blowout preventer

E - Fixed Constructions

21

B

166/50

E21B 33/06 (2006.01)

Patent

CA 1195608

ANNULAR BLOWOUT PREVENTER Abstract of the Disclosure An improved annular blowout preventer having a housing, an annular packer mounted in the housing, and a piston mounted in the housing for the application of an axial force to the annular packer; the annular packer includes a resilient annulus with a circular series of rigid interengaging inserts embedded in its upper face with the inner ends of the inserts being thicker than the outer ends so that the inner ends of the inserts move inward as the resilient annulus is moved and interengaging side projections and recesses with shoulders to ensure substantially uniform inward movement of the inner ends of the inserts to a preselected inner support position for the resilient annulus. Background Blowout preventers are used to control pressure within oil and gas wells during drilling and completion of the well. 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 be moved 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 of the resilient annulus when it is compressed radially inward by pistons. These pistons are positioned around the resilient annulus to provide a direct inwardly directed radial force on the

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