<p>A non-rotating downhole sleeve adapted for open hole drilling and/or casing centralization. The sleeve includes a tubular body made of hard plastic with integrally formed helical blades positioned around its outer surface and an inner surface configuration which allows drilling fluid circulation to form a non-rotating fluid bearing between the sleeve and the drill pipe or casing. The helical blades reduce sliding and rotating torque while drilling, with minimal obstruction to drilling fluid passing through the borehole between the blades. In one embodiment, improvements are provided during casing exit when drilling in open hole environments. In another embodiment, improvements are provided in the sleeve's resistance to compressive loading.</p>
申请公布号
WO2011059694(A1)
申请公布日期
2011.05.19
申请号
WO2010US54140
申请日期
2010.10.26
申请人
WWT INTERNATIONAL, INC.;CASASSA, GARRETT, C.;MITCHELL, SARAH, B.;MOORE, NORMAN, BRUCE
发明人
CASASSA, GARRETT, C.;MITCHELL, SARAH, B.;MOORE, NORMAN, BRUCE