ROBERT DAVID GRIMES
Pilots at White Rock Lk Trl, Cypress, TX

5467836, Nov 21, 1995

Sep 2, 1994

8/300502

Robert E. Grimes - Cypress TX
Danny E. Scott - The Woodlands TX
Rudolf C. O. Pessier - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 1046, E21B 1204

175401

An earth-boring bit of the fixed cutter variety is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat, polygonal face defining at least a pair of sharp cutting edges and at least a pair of cutting surfaces that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The face, cutting edge, and cutting surface of the gage insert are formed of a super-hard and abrasion-resistant material such as polycrystalline diamond or cubic boron nitride. The body of the insert is formed of a hard, fracture-tough material such as cemented tungsten carbide. The improved gage inserts provide an actively cutting gage surface that engages the sidewall of the borehole to promote shearing removal of the sidewall material. Such an improved gage insert provides an earth-boring bit with improved gage-holding ability, and improved steerability in directional drilling operations.

5479997, Jan 2, 1996

Aug 19, 1994

8/293228

Danny E. Scott - Houston TX
Robert E. Grimes - Cypress TX
Matthew R. Isbell - Houston TX
Rudolf C. O. Pessier - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 1000

175374

An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface intersecting a heel surface. A plurality of hard metal inserts are arranged in generally circumferential rows on the cutter and include a heel row of heel inserts on the heel surface of the cutter and a gage row of gage inserts on the gage surface of the cutter. At least one scraper insert, formed of material more wear-resistant than that of the cutter shell surface, is secured to the cutter shell surface generally at the intersection of the gage and heel surfaces. The scraper insert includes a gage and a heel insert surface. The gage and heel surfaces of the scraper insert converge to define a cutting edge for engagement with the sidewall of the borehole, the heel insert surface defining a positive rake angle with respect to the sidewall of the borehole of between 0 and 15 degrees. The cutting edge projects from the heel surface an amount not greater than the lesser of one-half the projection of the heel inserts from the heel surface and 30% of the pitch between the heel inserts.

5655612, Aug 12, 1997

Jun 6, 1995

8/468215

Robert Earl Grimes - Cypress TX
Danny Eugene Scott - The Woodlands TX
Rudolf Carl Otto Pessier - Houston TX

Baker Hughes Inc. - Houston TX

E21B 1046, E21B 1204

175401

An earth-boring bit is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The cutting end of the gage insert has a cutting end defining at least one sharp cutting edge and at least one cutting surface that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The cutting end, cutting edge, and cutting surface of the gage insert are formed of a super-hard and abrasion-resistant material such as polycrystalline diamond or cubic boron nitride. The body of the insert is formed of a hard, fracture-tough material such as cemented tungsten carbide. The improved gage inserts provide an actively cutting gage surface that engages the sidewall of the borehole to promote shearing removal of the sidewall material. Such an improved gage insert provides an earth-boring bit with improved gage-holding ability, and improved steerability in directional drilling operations.

5287936, Feb 22, 1994

Jan 31, 1992

7/830130

Robert E. Grimes - Cypress TX
Danny E. Scott - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 1000

175331

A cutter of an earth-boring bit is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat face with sharp cutting edges formed thereon and has cutting surfaces that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The face, cutting edge, and cutting surface of the gage insert are formed of a super-hard and abrasion-resistant material such as polycrystalline diamond or cubic boron nitride. The body of the insert is formed of a hard, fracture-tough material such as cemented tungsten carbide. The improved gage inserts are secured into sockets in the gage surface of the rolling cone cutter by interference fit. The improved gage inserts provide an actively cutting gage surface that engages the sidewall of the borehole to promote shearing removal of the sidewall material.

5351768, Oct 4, 1994

Jul 8, 1993

8/089318

Danny E. Scott - Houston TX
Robert E. Grimes - Cypress TX
Matthew R. Isbell - Houston TX
Rudolf C. O. Pessier - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 1000

175374

An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface intersecting a heel surface. A plurality of hard metal inserts are arranged in generally circumferential rows on the cutter and include a heel row of heel inserts on the heel surface of the cutter and a gage row of gage inserts on the gage surface of the cutter. At least one scraper insert, formed of material more wear-resistant than that of the cutter shell surface, is secured to the cutter shell surface generally at the intersection of the gage and heel surfaces. The scraper insert includes a gage and a heel insert surface. The gage and heel surfaces of the scraper insert converge to define a cutting edge for engagement with the sidewall of the borehole, the insert surface defining a positive rake angle with respect to the sidewall of the borehole of between 0 and 15 degrees. The cutting edge projecting from the heel surface an amount not greater than the lesser of one-half the projection of the heel inserts from the heel surface and 30% of the pitch between the heel inserts.

5323865, Jun 28, 1994

Dec 17, 1992

7/992869

Matthew R. Isbell - Houston TX
Rudolf C. O. Pessier - Houston TX
Robert E. Grimes - Cypress TX

Baker Hughes Incorporated - Houston TX

E21B 1000

175378

An earth-boring bit is provided with three cutters, at least one of the three cutters are provided with a heel cutting structure defined by a plurality of heel inserts having crests thereon, the heel inserts being disposed in at least one substantially circumferential heel row and the crests of the heel inserts being generally aligned traversely to the rotational axis of the cutter. At least another of the cutters is provided with a substantially circumferential row of axial inserts having crests thereon disposed proximally to the base of the cutter, the crests of the axial inserts being generally aligned with the axis of rotation of the cutter.

5542485, Aug 6, 1996

Jan 17, 1995

8/373149

Rudolf C. O. Pessier - Houston TX
Danny E. Scott - Montgomery TX
Robert E. Grimes - Cypress TX
Matthew R. Isbell - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 1016

175371

An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one chisel-shaped cutting element is secured to the gage surface. The chisel-shaped cutting element has a pair of surfaces converging to define a circumferential crest and is tilted toward the heel surface such that a line drawn through the center of the cutting element and its crest defines an acute angle of between about 15 and 75 degrees with the gage surface of the cutter.