Method and apparatus for efficiently lifting and lowering stands

Details Method and apparatus for efficiently lifting and lowering stands Method and apparatus for efficiently lifting and lowering stands

1996-10-18

1998-06-09

Neuder, William P.

Boring or penetrating the earth

With orienting or racking means for unconnected tools or...

166 775, E21B 700

Patent

active

057621519

ABSTRACT:
A method and apparatus for lifting and lowering pipe, including means for storing energy during the lowering of a first pipe and means for releasing the stored energy during the lifting of a second pipe.

REFERENCES:
patent: 3521445 (1970-07-01), Grable
patent: 3738455 (1973-06-01), Tintore
patent: 3899033 (1975-08-01), Van Huisen
patent: 4187546 (1980-02-01), Heffernan et al.
patent: 4209990 (1980-07-01), Shelton, Jr.
patent: 4286928 (1981-09-01), Clay
patent: 4334217 (1982-06-01), Nield et al.
patent: 4403655 (1983-09-01), Trout

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