E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/2
E21B 49/02 (2006.01) E21B 23/00 (2006.01) E21B 25/08 (2006.01)
Patent
CA 1097328
METHOD AND CORE BARREL APPARATUS FOR OBTAINING AND RETRIEVING SUBTERRANEAN FORMATION SAMPLES. ABSTRACT Core barrel apparatus and a method for obtaining and retrieving sealed core samples of subterranean forma- tions are disclosed. The core barrel apparatus comprises inner and outer core barrels. The upper portion of the outer core barrel is adapted to be connected to a drill string. A core bit for cutting a core sample is mounted on the lower portion of the outer core barrel. The inner core barrel comprises a sample chamber for receiving a core sample as it is formed at the bottom of a bore hole and an expansion chamber for receiving sample fluids. The sample chamber and expansion chamber are selectively connected to one another. The expansion chamber is sealed closed while the core barrel is lowered into the bore hole and the sample is being cut and received within the sample chamber. The lower portion of the sample chamber adjacent the core bit is sealed by a flap-valve which includes a flexible flap member. The flexible flap member is de- flected from its normal form of a flat disc into a semi- cylindrical form and stored adjacent to the inner circum- -2- ferene of the sample chamber while the sample is being is being cut. Once the core sample is within the sample chamber, the flap member is permitted to spring into its flat disc form and extend across the opening in the lower portion of the sample chamber in order to seal the core sample within the chamber. Thereafter the expansion chamber is opened to the sample chamber. As the apparatus is raised toward the surface and the pressure within the bore hole decreases, the expansion chamber expand in response to the pressure of the fluid within it and thereby maintains the pressure within the expansion chamber at or relatively near the bore hole pressure. In one embodiment, the expansion chamber comprises a flexi- ble tube which is preferably expandable both radially and axially. In other embodiment, the expansion chamber com- prises an axially expandable bellows. In still other em- bodiments, the expansion chamber comprises a cylinder having a movable sealing member therein such as a cup-like member, a piston or a flexible, shaped member.
306793
Spehrley Charles W.
Thompson Charles M.
Thompson Charles T.
American Coldset Corporation
Swabey Ogilvy Renault
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