公开(公告)号：CA2576072A1

公开(公告)日：2007-07-30

申请号：CA2576072

申请日：2007-01-29

Applicant: SMITH INTERNATIONAL

Inventor： GRIFFO ANTHONY ,  LIANG DAH-BEN ,  OLDHAM THOMAS W ,  LOCKWOOD GREGORY T

IPC: E21B10/46 ,  B23B51/00

Abstract: A drill bit that includes a bit body formed from a matrix powder and at leas t one cutting element for engaging a formation, wherein the matrix powder included (a) stoichiometric tungsten carbide particles, (b) cemented tungsten carbide particles, and (c) cast tungsten carbide particles, and wherein after formation with th e matrix powder, the bit has an erosion rate of less than 0.001 in/hr, a toughness of greater than 20 ksi(in0.5), and a transverse rupture strength of greater than 140 ks i is disclosed.

公开(公告)号：AU2006202788A1

公开(公告)日：2007-01-18

申请号：AU2006202788

申请日：2006-06-30

Applicant: SMITH INTERNATIONAL

Inventor： LIANG DAH-BEN ,  LOCKWOOD GREGORY T ,  VISWANADHAM RAMAMURTHY

IPC: E21B10/56 ,  E21B10/52

Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.

公开(公告)号：GB2419617A

公开(公告)日：2006-05-03

申请号：GB0520563

申请日：2005-10-10

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  OLDHAM THOMAS W ,  GRIFFO ANTHONY ,  KESHAVEN MADAPUSI K ,  CONROY DAVID A

IPC: E21B10/46 ,  C22C26/00 ,  E21B10/56

Abstract: An insert for a drill bit that includes diamond particles disposed in a matrix material, wherein the diamond particles have a contiguity of 15% or less is disclosed. A method of forming a diamond-impregnated cutting structure, that includes loading a plurality of substantially uniformly coated diamond particles into a mold cavity, pre-compacting the substantially uniformly coated diamond particles using a cold-press cycle, and heating the compacted, substantially uniformly coated diamond particles with a matrix material to form the diamond impregnated cutting structure is also disclosed.

公开(公告)号：GB2487867B

公开(公告)日：2014-08-20

申请号：GB201207667

申请日：2011-02-08

Applicant: SMITH INTERNATIONAL

Inventor： SHEN YUELIN ,  ZHANG YOUHE ,  SHI JIBIN ,  BURHAN YURI ,  LOCKWOOD GREGORY T

IPC: E21B10/573 ,  C22C26/00 ,  C22C29/08 ,  E21B10/567

Abstract: A cutting element may include a polycrystalline diamond layer and a reduced-CTE substrate comprising diamond particles disposed in a matrix material, wherein the diamond particles have a contiguity of 15% or less. Also, a cutting element may include a polycrystalline diamond layer and a reduced-CTE substrate comprising a matrix material, at least one diamond-filled region, and embedded diamond particles.

公开(公告)号：CA2594037C

公开(公告)日：2013-12-03

申请号：CA2594037

申请日：2007-07-18

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T

IPC: E21B10/42 ,  B22F3/12 ,  B23B51/00

Abstract: A cutting structure that includes a plurality of encapsulated particles dispersed in a first matrix material, the encapsulated particles comprising: an abrasive grit encapsulated within a shell, wherein the shell comprises a second matrix material different from the first matrix material is disclosed.

公开(公告)号：GB2491523B8

公开(公告)日：2013-05-22

申请号：GB201216349

申请日：2009-05-07

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  FULENCHECK JONAN

IPC: E21B10/46 ,  E21B10/55

公开(公告)号：GB2487509B

公开(公告)日：2013-01-16

申请号：GB201207672

申请日：2009-05-07

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  FULENCHECK JONAN

IPC: E21B10/46 ,  E21B10/55

公开(公告)号：GB2491749A

公开(公告)日：2012-12-12

申请号：GB201216351

申请日：2009-05-07

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  FULENCHECK JONAN

IPC: E21B10/46 ,  B22F5/00 ,  C22C26/00

Abstract: A method is provided to manufacture a drill bit (30, fig 3) having ribs extending from the body of the bit. The method includes adhering a quantity of abrasive particles and a first matrix material 40 to a vertical portion of a mold cavity corresponding to at least one of the ribs. A further quantity of abrasive particles and a second matrix material 34 are then loaded into the other portions of the mold cavity. The mold contents are heated to form an impregnated drill bit. The vertical portion may correspond to the gage region 48 of the bit. The mold may be infiltrated with a binder.

公开(公告)号：GB2487509A

公开(公告)日：2012-07-25

申请号：GB201207672

申请日：2009-05-07

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  FULENCHECK JONAN

IPC: E21B10/46 ,  E21B10/55

Abstract: A drill bit (30, fig 3) includes a body having a lower end face for engaging a rock formation. The end face has raised ribs 34 extending from the face of the bit body and separated by a channels therebetween. At least one of the ribs has a cutting portion 42, 44, 46 comprising a first diamond impregnated matrix material 43 and at least a portion of a gage surface region 48 of the rib comprising a second diamond impregnated matrix material 40 that is harder than the first diamond impregnated material. A superabrasive element 66 may be affixed to the gage region. An alternative composition for a drill bit and a method of manufacturing a drill bit are also disclosed.

公开(公告)号：GB2480207A

公开(公告)日：2011-11-09

申请号：GB201115383

申请日：2010-02-18

Applicant: SMITH INTERNATIONAL

Inventor： LOCKWOOD GREGORY T ,  ZHANG YOUHE

IPC: E21B10/00 ,  E21B10/42

Abstract: A drill bit that includes a bit body having a plurality of blades extending radially therefrom, at least a portion of the plurality of blades comprises a first matrix region comprising a plurality of first carbide particles separated by a first binder phase, each of the first carbide particles comprising a mixture of WC and W2C, and wherein the first matrix region has less than about 5 percent by volume, based on the total volume of the first matrix region, of complex metal carbides dispersed in the first binder phase; and at least one cutting element for engaging a formation disposed on at least one of the plurality of blades.