Process for retrieving a coring barrel comprising two tubes and

Details Process for retrieving a coring barrel comprising two tubes and Process for retrieving a coring barrel comprising two tubes and

1981-11-17

1983-12-06

Purser, Ernest R.

Boring or penetrating the earth

Processes

Sampling of earth formations

175246, 166217, 294 8624, E21B 4900

Patent

active

044187700

ABSTRACT:
An inner tube 2 of a core barrel is releasably locked within an outer tube 1 by pivotable latch feet 32 engaging an annular recess 31 in the outer tube. A retrieving head 3 is slidably coupled via a pin 40 and slot 41 to the inner tube, and carries sealing rings 6 disposed, during coring, within a recess 5 in the outer tube to permit fluid passage. To retrieve a core sample in an ascending boring the pressure in the lower part of the column is reduced, whereupon the retrieving head drops by gravity to seal off the outer tube. A pin 37 on the inner tube then drops to cam release the latch feet and unlock the inner tube from the outer tube. Thereafter, as the lower column is drained, the inner tube and retained core sample descend by gravity down through the outer tube to a retrieval site.

REFERENCES:
patent: 2656151 (1953-10-01), Miller
patent: 2857138 (1958-10-01), Svendsen et al.
patent: 3340939 (1967-09-01), Lindelof
patent: 4187919 (1980-02-01), Lambot

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