Cushion drill collar
United States Patent 3323327
US Patent References:
Shock absorber coupling for rotary drill stem
- - 2756022
Shock absorbing drill collar
- - 2795398
Fluid pressure one way jar
- - 2987129
Resilient drilling tool
- - 2991635
Shock absorber coupling for rotary drill stem
- - 2756022
Shock absorbing drill collar
- - 2795398
Fluid pressure one way jar
- - 2987129
Resilient drilling tool
- - 2991635
Inventors:
Leathers, Clarence H.
Nixon, Jeddy D.
Nixon, Jeddy D.
Publication Date:
06/06/1967
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Export Citation:
Assignee:
GRANT OIL TOOL COMPANY
Primary Class:
Other Classes:
175/320
International Classes:
E21B17/07; E21B17/16; E21B17/00; E21B17/02