Earth boring apparatus for geological drilling and coring

Details Earth boring apparatus for geological drilling and coring Earth boring apparatus for geological drilling and coring

1977-02-04

1978-07-18

Leppink, James A.

Boring or penetrating the earth

Processes

Sampling of earth formations

175 69, 175 71, 175171, 175215, 175213, E21B 4900, E21B 718, E21B 2100

Patent

active

041009819

ABSTRACT:
Apparatus for concentric multi-string drilling with reverse air vacuum for the entrainment of chips and dust, selectively controlled through a plurality of annuli defined by the multiplicity of drill strings adapted to individually and/or cooperatively operate drill bits and reamers and the like to bore geological formations as required.

REFERENCES:
patent: 1876627 (1932-09-01), Davis et al.
patent: 2657016 (1953-10-01), Grable
patent: 3291229 (1966-12-01), Houston
patent: 3807514 (1974-04-01), Murrell
patent: 3887020 (1975-06-01), Chaffin
patent: 3968845 (1976-07-01), Chaffin

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