Self-contained closure mechanism for a core barrel inner tube as

Details Self-contained closure mechanism for a core barrel inner tube as Self-contained closure mechanism for a core barrel inner tube as

1992-03-06

1993-07-27

Bagnell, David J.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

175243, 175317, E21B 2500

Patent

active

052303900

ABSTRACT:
A closure mechanism for preventing fluid access to an inner tube of a core barrel assembly is disclosed in which the closure mechanism is configured to move from an open, or unoccluded, condition to an occluded condition in response to increased fluid flow rates and pressure differentials occurring at the closure mechanism. The closure mechanism is also configured to maintain occlusion of the inner tube under substantially all types of drilling conditions, and particularly those where conventional closure mechanisms may fail, such as in horizontal drilling. The closure mechanism generally includes a conduit structure associated with the inner tube, and having a seat, an occlusion structure, such as a ball, and releasing structure which maintains the occlusion structure in spaced relationship to the seat until increasing pressure differentials result in release of the occlusion structure to register with the seat.

REFERENCES:
patent: 1364084 (1921-01-01), Dodds
patent: 1508230 (1924-09-01), Lewis
patent: 1619328 (1927-01-01), Benckenstein
patent: 2159249 (1939-05-01), Brantley
patent: 2239586 (1941-04-01), Appleby
patent: 3907046 (1975-09-01), Gaylord

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