发明名称 CORE LIFTER
摘要 A core lifter may be used in a drilling system. An exterior surface of the core lifter may include a plurality of longitudinally-oriented recesses. The core lifter may include a raised contact feature that may extend inwardly away from a gripping surface of the core lifter. The core lifter may include a flared skirt configured to limit movement of the core lifter relative to a core lifter case. The core lifter may be formed via stamping a sheet of material.
申请公布号 WO2011056809(A3) 申请公布日期 2011.07.28
申请号 WO2010US55196 申请日期 2010.11.03
申请人 LONGYEAR TM, INC.;DRENTH, CHRISTOPHER, L.;ZHANG, HONGYAN 发明人 DRENTH, CHRISTOPHER, L.;ZHANG, HONGYAN
分类号 E21B25/04;E21B17/00 主分类号 E21B25/04
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