Apparatus and methods for sponge coring

Details Apparatus and methods for sponge coring Apparatus and methods for sponge coring

E - Fixed Constructions

21

B

E21B 25/00 (2006.01) G01N 1/08 (2006.01)

Patent

CA 2578943

A piston assembly for providing a fluid seal within an inner barrel assembly of a core barrel apparatus, with the inner barrel assembly including an interior wall, comprises a piston configured to provide a fluid seal between an outer cylindrical surface of the piston and the interior wall of the inner barrel assembly. At least one laterally movable locking element is associated with the piston. The at least one locking element is configured to engage a cooperative structure of the interior wall of the inner barrel assembly when the at least one locking element is at a first position and to disengage the cooperative structure when the at least one locking element is at a second position. A slidable piston rod is associated with the piston. The piston rod is located and configured to maintain the at least one locking element at the first position when the piston rod is at one position. The piston rod is further configured for travel relative to the piston to another position where the at least one locking element is free to move to the second position.

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