Mechanically Locked Debris Barrier

摘要

A debris barrier is installed and locked to the liner tieback extension. When it is time to check release from the liner before initiating a cement job the inner running string is lifted. The lock stays engaged to the liner tieback extension tube as the inner running string is lifted. In that manner the debris barrier remains in position during the lifting to determine release from the liner before cementing. After cementing, the inner running string is lifted further to eventually undermine the lock and capture the debris barrier to bring the debris barrier to the surface with the inner running string. The lock can be dogs or collets or the like. An inner sleeve or a lift sub with an upset can be the support whose axial movement beyond a predetermined value undermines the lock to release the debris barrier.

主权项

1. A debris barrier assembly for an annular gap between relatively movable tubular members comprising:
an inner tubular member surrounded by an outer tubular member to define an annular gap therebetween; an annularly shaped debris barrier disposed in said gap and selectively mechanically locked to one of said tubular members and remaining locked during a predetermined movement of the other of said tubular members.