By-pass tool

Details By-pass tool By-pass tool

1975-12-31

1977-04-26

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

With longitudinally spaced valve seats

166334, 175107, 175321, E21B 1700, E21B 312

Patent

active

040195929

ABSTRACT:
There is disclosed a tool which is connectible as part of a drill string and which is adapted, upon lifting of the drill string, to permit drilling fluid therein to by-pass a motor in the lower end of the string below the tool.

REFERENCES:
patent: 2591488 (1952-04-01), Yost
patent: 2865602 (1958-12-01), Whittle
patent: 3059619 (1962-10-01), Beaumont
patent: 3329221 (1967-07-01), Walker
patent: 3497009 (1970-02-01), Harrington
patent: 3504936 (1970-04-01), Brown et al.
patent: 3656565 (1972-04-01), Fox

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