Earth drilling apparatus

Details Earth drilling apparatus Earth drilling apparatus

1977-12-12

1980-02-26

Staab, Lawrence J.

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

173140, 173163, 175220, B23Q 500, E21C 500

Patent

active

041901193

ABSTRACT:
An earth drilling method and apparatus utilizes a unique drill string rotary drive and support arrangement which provides for the utilization of longer drill strings than could heretofore be accommodated on prior art drill masts of equal height.

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