Circulation sub for in-hole hydraulic motors

Details Circulation sub for in-hole hydraulic motors Circulation sub for in-hole hydraulic motors

1975-03-17

1976-11-02

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175317, E21B 312

Patent

active

039891143

ABSTRACT:
This invention relates to circulation subs used in connection with hydraulic in-hole motors with means for selectively interrupting circulation through the circulation sub.

REFERENCES:
patent: 2312789 (1943-03-01), Appleby
patent: 2596832 (1952-05-01), Williams
patent: 2865602 (1958-12-01), Whittle
patent: 2882020 (1959-04-01), Carr et al.
patent: 3211244 (1965-10-01), Cordary
patent: 3661218 (1972-05-01), Brown
patent: 3799278 (1974-03-01), Oliver
patent: 3802521 (1974-04-01), Oliver
patent: 3857655 (1974-12-01), Tschirky

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