发明名称 BIT CONE WITH HARDFACED NOSE
摘要 A drill bit for drilling a wellbore, the drill bit having a cutter which has tungsten carbide inserts and a spear point. The spear point has a neck that joins a smooth portion of the cutter and blades that extend from the neck and converge to an apex. The blades define valleys or spaces between them. A layer of hardfacing is applied to the entire spear point including the interim spaces and the neck.
申请公布号 WO2010019834(A3) 申请公布日期 2010.06.03
申请号 WO2009US53801 申请日期 2009.08.14
申请人 BAKER HUGHES INCORPORATED;FELDERHOFF, FLOYD, C.;FREEMAN, MARK, A.;MASSEY, ALAN, J.;GILMORE, KENNETH, E.;STANFIELD, GLEN 发明人 FELDERHOFF, FLOYD, C.;FREEMAN, MARK, A.;MASSEY, ALAN, J.;GILMORE, KENNETH, E.;STANFIELD, GLEN
分类号 E21B10/42;E21B10/46;E21B10/50 主分类号 E21B10/42
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