发明名称 Rod insertion method and friction reducing device
摘要 The present invention provides a friction reducing device for an elongate member. The device comprises a friction reducing sleeve removably positionable on a first longitudinal segment of the elongate member. The present invention also provides a method of inserting an elongate assembly into the ground. The method comprises the step of incorporating the inventive friction reducing device in the elongate assembly.
申请公布号 US5265466(A) 申请公布日期 1993.11.30
申请号 US19920845418 申请日期 1992.03.03
申请人 CONOCO INC. 发明人 RICHTER, DAVID L.;SWEENEY, WILLIAM T.
分类号 E21B7/26;E21B17/10;E21B47/01;E21B49/00;G01N1/08;(IPC1-7):G01N3/00 主分类号 E21B7/26
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