Apparatus for borehole drilling

Details Apparatus for borehole drilling Apparatus for borehole drilling

1974-10-24

1976-04-27

Leppink, James A.

Wells

Central chamber sealed with respect to prepositioned...

Surrounding conduit carries packer or plug

166180, 166187, E21B 3312, E21B 33127

Patent

active

039527999

ABSTRACT:
Apparatus is disclosed for borehole drilling which provides a pressure-tight seal between the drill pipe and the borehole or casing. The apparatus uses resilient elements between the borehole and the body portion of the drilling head. The resilient elements may be engaged in sealing engagement in the borehole by hydraulic or air inflation.

REFERENCES:
patent: 7479 (1877-01-01), Fox
patent: 597316 (1898-01-01), Durprou
patent: 2451762 (1948-10-01), Millikan
patent: 2675878 (1954-04-01), MacGregor
patent: 2778431 (1957-01-01), Lynes
patent: 2852284 (1958-09-01), Bryson
patent: 3172476 (1965-03-01), Voliva
patent: 3511512 (1970-05-01), Wheelock
patent: 3516679 (1970-06-01), Schmitt
patent: 3760878 (1973-09-01), Peevey

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