Multi-walled drill string for exploration-sampling drilling syst

Details Multi-walled drill string for exploration-sampling drilling syst Multi-walled drill string for exploration-sampling drilling syst

1991-02-15

1993-02-16

Britts, Ramon S.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With tool shaft having plural passages for drilling fluid

175320, 175405, E21B 1718

Patent

active

051862662

ABSTRACT:
The drilling system of this invention is specifically adapted to reverse-circulation sample drilling employing a downhole hammer drill. The drilling head configuration provides for simultaneous feeding into a multi-walled drill string with drilling mud, compressed air to operate the hammer drill, to feed the hammer drill head and withdrawing of the return air. The system includes a triple-walled drill rod especially adapted for downhole hammer drilling that eliminates the need for a separate drive casing string.

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patent: 4194579 (1980-03-01), Bailey et al.
patent: 4371046 (1983-02-01), Read
patent: 4691790 (1987-09-01), Reichman et al.
patent: 4940098 (1990-07-01), Moss

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