Hydraulic actuated drill collar
United States Patent 3105561
US Patent References:
/0556718.html
- - 0556718

Drilling structure and circulating pump
- - 1983287

Well and the like sinking apparatus
- - 2223645

Hydraulic fishing tool
- - 2474453

Pulling tool
- - 2537413


Inventors:
Kellner, Jackson M.
Publication Date:
10/01/1963
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Assignee:
JERSEY PROD RES CO
Primary Class:
175/230
Other Classes:
299/31, 173/72, 175/27, 92/105, 175/325.200, 92/150, 92/48
International Classes:
E21B44/00
US Patent References:
2684835Apparatus for drilling well boreholes
2712920Torque arrestors
2743781Hydraulic anchor tool
2877822Hydraulically operable reciprocating motor driven swage for restoring collapsed pipe
2901044Pulling tool
2937007Well drilling system
2946578Excavator apparatus having stepper type advancing means