Patent ID: 9212532
Filing Date: 2015-12-15
Classification: E21B

Abstract:
1. A blowout preventer assembly comprising an annular blow out preventer having an annular packing unit and an actuator operable to reduce the internal diameter of the annular packing unit, wherein the assembly further comprises a stripping sleeve having a tubular elastomeric sleeve which in use is positioned generally centrally of the packing unit so that the packing unit surrounds at least a portion of the elastomeric sleeve, wherein the actuator comprises a piston movable generally parallel to the longitudinal axis of the blowout preventer by the supply of pressurised fluid to the annular blow out preventer, wherein the annular blow out preventer has an outer housing, and the annular packing unit and the stripping sleeve are rotationally static relative to the outer housing, wherein the stripping sleeve further comprises two annular support parts, the elastomeric sleeve being positioned between the two support parts, and wherein the outer diameter of each of the support parts is greater than the outer diameter of the elastomeric sleeve.