Method for directional coring

Details Method for directional coring Method for directional coring

1990-01-31

1991-07-09

Dang, Hoang C.

Boring or penetrating the earth

Processes

Sampling of earth formations

175 61, E21B 4902, E21B 706

Patent

active

050296531

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 allowed 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.

REFERENCES:
patent: 2571644 (1951-10-01), Zublin
patent: 2852230 (1958-09-01), Garrison
patent: 3169589 (1965-02-01), Bodine, Jr.
patent: 3353612 (1967-11-01), Bannister
patent: 4248313 (1981-02-01), Bonca
patent: 4518050 (1985-05-01), Sollie et al.
patent: 4875531 (1989-10-01), Biehl et al.

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