Rock core removal method and apparatus

Details Rock core removal method and apparatus Rock core removal method and apparatus

2011-05-03

2011-05-03

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Processes

Sampling of earth formations

C175S020000, C175S244000, C175S249000, C175S251000

Reexamination Certificate

active

07934568

ABSTRACT:
A rock core removal method and apparatus allows efficient, safe, and reliable removal of a rock core sample. An inner collet tube and an outer ground tube, within a drill tube, protect the core sample during drilling. At depth, the collet tube is raised with respect to the ground tube so that the conical wall of the ground tube pushes constricting fingers on the collet tube inward, gripping the core sample within. The collet tube and ground tube are then raised, rotated, or raised and rotated, applying the necessary force to break the core sample off of the substrate. After retracting the tubes, the collet tube is lowered with respect to the ground tube to release the core sample. An ejection rod then pushes the core sample out of the collet tube. The ground tube may also act as the actuating means for a quick-change drill-bit release feature.

REFERENCES:
patent: 2537605 (1951-01-01), Sewell
patent: 3086602 (1963-04-01), Henderson
patent: 4566545 (1986-01-01), Story et al.
patent: 4694916 (1987-09-01), Ford
patent: 5211249 (1993-05-01), Richter
patent: 6550549 (2003-04-01), Myrick
patent: 6719070 (2004-04-01), Puymbroeck et al.

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