Apparatus for directional coring

Details Apparatus for directional coring Apparatus for directional coring

1991-02-25

1991-10-01

Dang, Hoang C.

Boring or penetrating the earth

Tool shaft advanced relative to guide insertable in...

Tool telescopes over guide having surface set at angle in hole

175 82, 175107, 175246, 175248, 175257, E21B 402, E21B 708, E21B 2502

Patent

active

050525026

ABSTRACT:
The present invention comprises a novel method and apparatus for sinking drill holes in underground rock formations while generating drill cores as rock samples. More particularly, the present invention discloses a method and apparatus which allows for an expanded analysis of ground formations over a larger area through the extraction of drill cores as rock samples. The method and apparatus herein disclosed allows one to drill a number of core shaft sections from the base of a main shaft section in various directions in order to obtain a number of sample cores.

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patent: 4679636 (1987-07-01), Ruhle
patent: 4875531 (1989-10-01), Biehl et al.
patent: 4969528 (1990-11-01), Jurgens

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