Skirted hammer sub for dual tube drilling

Details Skirted hammer sub for dual tube drilling Skirted hammer sub for dual tube drilling

1977-04-11

1981-06-23

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Discharge passage for motive fluid directed toward bore...

175215, E21B 4902

Patent

active

042744970

ABSTRACT:
A skirted crossover sub for joining an air hammer to a string of dual concentric drill pipe is characterized by passageways for directing air from the pipe string annulus to operate the hammer and for directing exhaust air and cuttings from the hammer bit to the inner pipe of the string. A tubular skirt at the downhole end of the sub surrounds the hammer and channels the flow of exhaust air therebetween. A packer and uphole reamer may be included, as well as valves for air lift and for providing proper air flow direction in the borehole annulus.

REFERENCES:
patent: 2807443 (1957-09-01), Wyman
patent: 3151690 (1964-10-01), Grable
patent: 3208539 (1965-09-01), Henderson
patent: 3596720 (1971-08-01), Elenburg
patent: 3667555 (1972-06-01), Elenburg
patent: 3978923 (1976-09-01), Ford
patent: 3991834 (1976-11-01), Curington

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