公开(公告)号：AU3999097A

公开(公告)日：1999-04-29

申请号：AU3999097

申请日：1997-10-08

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  FANG ZHIGANG ,  HUANG SUJIAN ,  SIRACKI MICHAEL A

IPC: E21B10/24 ,  F16J9/20 ,  F16J9/28

公开(公告)号：AU703458B2

公开(公告)日：1999-03-25

申请号：AU3998997

申请日：1997-10-08

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  FANG ZHIGANG ,  KYKER G STEVE ,  HUANG SUJIAN ,  JAMES BRIAN A ,  DENTON ROBERT

IPC: E21B10/22 ,  E21B10/25 ,  E21B10/24 ,  F16J9/20 ,  F16J9/28

公开(公告)号：CA2125335C

公开(公告)日：1998-08-04

申请号：CA2125335

申请日：1994-06-07

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  MCDONOUGH SCOTT D ,  PORTWOOD GARY ,  SIRACKI MICHAEL A

IPC: E21B10/16 ,  E21B10/52 ,  E21B10/56 ,  E21B10/567 ,  E21B10/50

Abstract: A rotary cone rock bit for drilling boreholes in an earthen formation is disclosed. One or more rotary cones are rotatably retained on a journal bearing connected to the rock bit. These rotary cones form a circumferential heel row with extended ultra hard shaped cutters spaced within the heel row. Each of the shaped cutters form a cutting surface that extends above the heel row or is angled with respect to the formation to maintain the cutters in compression whil e the cutters shear a borehole wall. The shaped cutters serve to maintain the borehole diameter.

公开(公告)号：ZA978996B

公开(公告)日：1998-05-11

申请号：ZA978996

申请日：1997-10-08

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  HUANG SUJIAN ,  FANG ZHIGANG ,  JAMES BRIAN A ,  KYKER G STEVE ,  DENTON ROBERT

IPC: E21B10/22 ,  E21B10/25 ,  F16J ,  E21B

公开(公告)号：GB2290323A

公开(公告)日：1995-12-20

申请号：GB9512021

申请日：1995-06-13

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  PETERSON STEVE ,  KAR NARESH J ,  KESHAVAN MADAPUSI K

IPC: E21B10/22 ,  E21B10/25

Abstract: A rock bit for drilling subterranean formations has an improved dynamic O-ring seal 33 for retaining lubricant around the rock bit bearings during operation of the rock bit. Such a bit has a plurality of journal pins 16, each having a bearing surface, and a cutter cone mounted on each journal pin and including a bearing surface. A grease reservoir 29 is in communication with such bearing surfaces for maintaining grease adjacent to the bearing surfaces. The grease is sealed in with dynamic O-ring seals 33 rotating against a sealing surface 46 with a Vickers hardness of at least 1000 and vibratory burnished to have a surface finish in the range of from 5 to 32 microinches (0.13 to 0.8 micrometers) AA. Preferably, the sealing surface 46 is formed on a seal ring interposed between the cone and journal. Preferably the sealing surface 46 comprises a tungsten carbide composite sprayed onto the outside surface of a steel ring which is then welded to a journal.

公开(公告)号：GB2274129A

公开(公告)日：1994-07-13

申请号：GB9400012

申请日：1994-01-04

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  PORTWOOD GARY ,  SIRACKI MICHAEL A

IPC: E21B10/52 ,  E21B10/56 ,  E21B10/567 ,  E21B10/16

Abstract: A rotary cone rock hit for drilling boreholes in an earthen formation has one or more rotary cones 16 rotatively retained on a journal bearing 19 connected to the rock bit body. These rotary cones 16 have a plurality of tungsten carbide inserts 18 and a gage row 15 of tungsten carbide inserts for drilling the hole diameter. A circumferential heel row 30 has extended ultra hard shaped cutters spaced within the heel row. Each of the shaped cutters has a cutting edge 36 that shears a borehole wall formed by the formation as the rotary cone rotates against a bottom of the borehole. The shaped cutters serve to maintain the borehole diameter and to divert formation debris away from bearing surfaces formed between the rotary cone and the journal bearing. Preferably the ultra hard cutters have a polycrystalline diamond cutting edge.

公开(公告)号：FR2613764B3

公开(公告)日：1989-10-27

申请号：FR8804716

申请日：1988-04-08

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  ERPENBECK GERARD P ,  NGUYEN H VAN

IPC: E21B10/08 ,  E21B10/18 ,  E21B10/52 ,  E21B17/10

公开(公告)号：CA2477673C

公开(公告)日：2008-03-25

申请号：CA2477673

申请日：2004-08-16

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  GRIFFO ANTHONY ,  RICHMAN LANCE T ,  VISWANADHAM RAMAMURTHY

IPC: E21B10/08 ,  B21K5/02 ,  B23P15/28 ,  E21B10/16 ,  E21B10/50

Abstract: A shaped insert that includes a top portion, and a grip length, wherein the grip length is modified to have a non-uniform cross sectional area is disclosed. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is modified such that the insert is non-cylindrical. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is coated in a non-uniform manner.

公开(公告)号：CA2616245A1

公开(公告)日：2005-02-13

申请号：CA2616245

申请日：2004-08-16

Applicant: SMITH INTERNATIONAL

Inventor： CAWTHORNE CHRIS E ,  GRIFFO ANTHONY ,  RICHMAN LANCE T ,  VIWANADHAM RAMAMURTHY

IPC: E21B10/08 ,  E21B10/16 ,  E21B10/50

公开(公告)号：CA2477673A1

公开(公告)日：2005-02-13

申请号：CA2477673

申请日：2004-08-16

Applicant: SMITH INTERNATIONAL

Inventor： VIWANADHAM RAMAMURTHY ,  RICHMAN LANCE T ,  CAWTHORNE CHRIS E ,  GRIFFO ANTHONY

IPC: E21B10/16 ,  E21B10/08 ,  B21K5/02 ,  B23P15/28 ,  E21B10/50

Abstract: A shaped insert that includes a top portion, and a grip length, wherein t he grip length is modified to have a non-uniform cross sectional area is disclosed. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is modified such that the insert is non-cylindrical. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is coated in a non-uniform manner.