FIELD: well drilling. SUBSTANCE: pipe grab cylinder is installed free with respect to case and funnel. Pressure ring is detachable. Grab catchers are related to leaf springs. The pipe grab is provided with layer rings placed in the case between lower cylinder butt and funnel. EFFECT: lower material consumption. 2 cl, 1 dwg
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|
RU2010946C1 |
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Authors
Dates
1996-06-10—Published
1992-10-08—Filed