Patent ID: 6659204
Filing Date: 2003-12-09
Classification: E21B

Abstract:
An apparatus for retrieving a core sample under pressure, comprising:an outer barrel; an inner barrel having a first end and a second end and defining a pressure chamber thereinbetween selectively disposable within said outer barrel, said inner barrel comprised of an inner tube and an outer tube, said inner tube being selectively longitudinally movable relative to said outer tube; a valve connected to the inner barrel proximate said second end for sealing said inner barrel to form said pressure chamber; a linkage mechanism interconnected between said valve and said outer tube for closing said valve when one of said inner tube and said outer tube longitudinally moves relative to the other; at least one selectively releasable latching mechanism for selectively securing the inner tube to the outer tube; and a second selectively releasable latching mechanism for selectively securing at least a portion of the inner barrel to the outer barrel wherein said inner barrel is selectively longitudinally movable relative to the outer barrel for recovering the inner barrel containing a core sample under pressure while leaving the outer barrel downhole.