Patent ID: 8919433
Filing Date: 2014-12-30
Classification: E21B

Abstract:
1. An annular volume debris barrier at a subterranean location, comprising: a movable inner member extending through a barrier zone of surrounding tubular to define an annular volume therebetween, said barrier zone defined by a reduced diameter length inside said surrounding tubular; a porous foam debris barrier selectively supported in said barrier zone and mounted on said inner member and having an initial external radial dimension at least as large as said barrier zone that makes selective contact with the surrounding tubular at said barrier zone by virtue of axial movement of said debris barrier into alignment with said barrier zone to retain debris in said annular volume in a first annular zone defined on one side of said debris barrier when said debris barrier is selectively relatively axially moved by tandem movement with said inner member with respect to said surrounding tubular and into contact with said surrounding tubular in said barrier zone while said surrounding tubular is disposed at the subterranean location, while allowing hydrostatic fluid pressure to act through said debris barrier to reach a second annular zone defined on an opposite axial end of said debris barrier when said debris barrier is selectively in contact with said barrier zone of said surrounding tubular; said debris barrier selectively placed out of contact with said surrounding tubular leaving an open flow path between said first and second annular zones.