Dual-rotating eccentric drilling apparatus and method

Details Dual-rotating eccentric drilling apparatus and method Dual-rotating eccentric drilling apparatus and method

1979-08-27

1981-05-19

Leppink, James A.

Boring or penetrating the earth

Processes

Boring with specific fluid

175107, E21B 402

Patent

active

042678935

ABSTRACT:
Apparatus and method for drilling a borehole in which an undersized drill bit mounted eccentrically within the borehole is rotated about its axis in engagement with the bottom of the borehole by means of a downhole motor while the drill bit is simultaneously rotated in a planetary motion about the axis of the borehole.

REFERENCES:
patent: 1254267 (1918-01-01), Pickin
patent: 2511831 (1950-06-01), Adamson
patent: 2709574 (1955-05-01), Arutunoff
patent: 3161243 (1964-12-01), Davis
patent: 3640352 (1972-02-01), Stuart
patent: 3682258 (1972-08-01), Kelly, Jr. et al.
patent: 3835942 (1974-09-01), Leonardi
patent: 4102415 (1978-07-01), Cunningham

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