Modified rotating head assembly for rotating blowout preventors

摘要

Improvements in the rotating head assembly of a rotating blowout preventor. The rotating head assembly includes a stripper rubber which has an upper annular area attached to the lower annular end of a metal support member. The support member extends upwardly into fixed relationship respective to part of the rotating head. The stripper rubber downwardly depends into concentrically arranged, spaced annular body members. The inner annular body has an axial passageway formed therethrough for telescopingly receiving a rotating member in sealed relationship therewith. The outer annular member has an outer circumferentially extending wall surface which rotatably engages the lower marginal end of a fixed washpipe. The inner and outer annular members are made integral respective to the upper annular area of the stripper rubber, and are separated from one another by a downwardly opening annular recess. A cylindrical control sleeve is vulcanized within the outer annular member to control the deformation of the outer peripheral wall surface which engages the inner wall surface of the washpipe.