Reverse circulation drilling system with hexagonal pipe coupling

Details Reverse circulation drilling system with hexagonal pipe coupling Reverse circulation drilling system with hexagonal pipe coupling

1998-01-21

1999-09-28

Neuder, William

Boring or penetrating the earth

With tool shaft detail

285330, F16L 3500, E21B 4300

Patent

active

059572264

ABSTRACT:
A reverse circulation, pneumatic drilling assembly wherein the bit assembly is operatively connected to a dual wall pipe assembly. A supply of compressed air is conducted through the annulus of the dual wall pipe assembly to a down hole pneumatic hammer. Exhaust air from the down hole hammer is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube of the dual wall pipe assembly. Sections of the dual wall pipe are joined by hex head couplings which are quickly and easily engaged and disengaged.

REFERENCES:
patent: 3786878 (1974-01-01), Chapman
patent: 4655482 (1987-04-01), Myers et al.
patent: 4811975 (1989-03-01), Paul, Jr. et al.
patent: 5511628 (1996-04-01), Holte
patent: 5882044 (1999-03-01), Sloane

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