Patent ID: 8776892
Filing Date: 2014-07-15
Classification: E21B,F16H,Y10T

Abstract:
1. A system for rotating an element inside a high wellhead housing, the system comprising: a drilling adapter housing connectable to the high pressure wellhead housing, comprising an opening through a wall of the drilling adapter housing into an internal chamber in which, in use, the element to be rotated is located; a bushing located within the opening; a worm gear rotatably mounted in the bushing, the worm gear being offset from the axial centre of the bushing such that rotation of the bushing moves the worm gear between an extended position, wherein a thread of the worm gear engages the element in the internal chamber, and a retracted position, wherein the thread is disengaged from the element in the chamber; and wherein, in the extended position, the worm gear is configured to rotate the element 360° while allowing the element to move axially.