Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1975-12-31
1977-04-26
Leppink, James A.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175228, 308DIG9, 415502, E21B 312, E21B 4100
Patent
active
040195910
ABSTRACT:
There are disclosed several embodiments of a well tool which is adapted to be connected as part of a pipe string through which drilling fluid is circulated, and which comprises inner and outer members which are rotated with respect to one another by a motor between them.
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patent: 3232362 (1966-02-01), Cullen et al.
patent: 3291230 (1966-12-01), Cullen et al.
patent: 3659662 (1972-05-01), Dickey
patent: 3741321 (1973-06-01), Slover, Jr. et al.
patent: 3749511 (1973-07-01), Mayall
patent: 3807513 (1974-04-01), Kern et al.
Eickenroht Marvin B.
Engineering Enterprises Inc.
Hyer W. F.
Leppink James A.
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