公开(公告)号：EP2257686A2

公开(公告)日：2010-12-08

申请号：EP09712067.9

申请日：2009-02-17

申请人： Baker Hughes Incorporated

发明人： DICK, Aaron ,  CURRY, David, A. ,  KOLTERMANN, Terry, J. ,  LIN, Chih ,  SCOTT, Dan, E. ,  ZAHRADNIK, Anton ,  KIRWAN, Brendan, P.

IPC分类号： E21B10/48 ,  E21B10/02

CPC分类号： E21B10/22

摘要： Downhole tool bearings are provided with diamond enhanced materials. The diamond enhanced materials comprise diamond grains in a matrix of tungsten or silicon carbide. A brazed diamond grit or diamond particles coated with a reactive braze may be utilized for bearing applications. Bearing rings formed at least in part with diamond enhanced material are installed on at least one of the bearing pin journal, the nose and the cone cavity. The bearing rings may be continuous rings or partial rings and attached to the journal pin or cone cavity. These may include thrust bearings, rollers, roller race, balls and ball races made of diamond enhanced material. These bearing surfaces also are formed at least in part with diamond enhanced material and attached to portions of the journal or cone bearing surfaces.

公开(公告)号：EP1828535B1

公开(公告)日：2009-05-06

申请号：EP05852695.5

申请日：2005-12-02

申请人： BAKER HUGHES INCORPORATED

发明人： LIN, Chih ,  SULLIVAN, Eric, Charles

IPC分类号： E21B10/22 ,  E21B10/24

CPC分类号： E21B10/24 ,  F16C33/102 ,  F16C2240/40 ,  F16C2240/44

摘要： An earth boring bit has sliding engaging surfaces between a cone assembly and a bearing pin. Micropores are formed in at least one of the engaging surfaces. Each of the micropores has a leading portion and a trailing portion. The leading portion is at a more gradual slope than the trailing portion. The micropores are located in a pattern of a greater density in a region of the engaging surfaces that operate at higher pressures than in other regions.