WO1997048874A3 - Cutter element adapted to withstand tensile stress - Google Patents

Cutter element adapted to withstand tensile stress Download PDF

Info

Publication number
WO1997048874A3
WO1997048874A3 PCT/US1997/010778 US9710778W WO9748874A3 WO 1997048874 A3 WO1997048874 A3 WO 1997048874A3 US 9710778 W US9710778 W US 9710778W WO 9748874 A3 WO9748874 A3 WO 9748874A3
Authority
WO
WIPO (PCT)
Prior art keywords
cutter element
present
trailing
leading compression
cutters
Prior art date
Application number
PCT/US1997/010778
Other languages
French (fr)
Other versions
WO1997048874A2 (en
Inventor
Gary Ray Portwood
Scott D Mcdonough
Dennis Cisneros
Original Assignee
Smith International
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/668,109 external-priority patent/US5813485A/en
Application filed by Smith International filed Critical Smith International
Priority to AU34975/97A priority Critical patent/AU3497597A/en
Priority to GB9826997A priority patent/GB2330605B/en
Priority to CA002257932A priority patent/CA2257932C/en
Publication of WO1997048874A2 publication Critical patent/WO1997048874A2/en
Publication of WO1997048874A3 publication Critical patent/WO1997048874A3/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/16—Roller bits characterised by tooth form or arrangement
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
    • E21B10/52—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel- or button-type inserts

Abstract

A cutter element (65) having a substantially flat wear face (63) and leading compression (64) and trailing tension (66) zones, wherein the leading compression zone (64) is sharper than the trailing tension zone (66). Sharpness is defined as either a smaller inside angle at the intersection of a pair of planes or as a smaller radius of curvature. The cutter element of the present invention experiences reduced stress on its trailing portion in the direction of cutting movement and therefore is less subject to extreme impact damage and cyclic fatigue. The present invention can be applied with particular advantage to heel row cutters (60), but can also be applied to cutters in other rows that primarily ream the borehole corner. The present cutter element can be constructed so as to have a positive or negative rake angle at its leading compression zone, or to have any of a variety of shapes, depending on the characteristics of the formation in which it is to be used.
PCT/US1997/010778 1996-06-21 1997-06-20 Cutter element adapted to withstand tensile stress WO1997048874A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU34975/97A AU3497597A (en) 1996-06-21 1997-06-20 Cutter element adapted to withstand tensile stress
GB9826997A GB2330605B (en) 1996-06-21 1997-06-20 Cutter element adapted to withstand tensile stress
CA002257932A CA2257932C (en) 1996-06-21 1997-06-20 Cutter element adapted to withstand tensile stress

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/668,109 US5813485A (en) 1996-06-21 1996-06-21 Cutter element adapted to withstand tensile stress
US08/668,109 1996-06-21
US08/833,366 1997-04-04
US08/833,366 US5915486A (en) 1996-06-21 1997-04-04 Cutter element adapted to withstand tensile stress

Publications (2)

Publication Number Publication Date
WO1997048874A2 WO1997048874A2 (en) 1997-12-24
WO1997048874A3 true WO1997048874A3 (en) 1998-02-05

Family

ID=27099840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/010778 WO1997048874A2 (en) 1996-06-21 1997-06-20 Cutter element adapted to withstand tensile stress

Country Status (4)

Country Link
AU (1) AU3497597A (en)
CA (1) CA2257932C (en)
GB (1) GB2330605B (en)
WO (1) WO1997048874A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7743855B2 (en) * 2006-09-05 2010-06-29 Smith International, Inc. Drill bit with cutter element having multifaceted, slanted top cutting surface
US7730976B2 (en) * 2007-10-31 2010-06-08 Baker Hughes Incorporated Impregnated rotary drag bit and related methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058177A (en) * 1976-03-29 1977-11-15 Dresser Industries, Inc. Asymmetric gage insert for an earth boring apparatus
US4334586A (en) * 1980-06-05 1982-06-15 Reed Rock Bit Company Inserts for drilling bits
US5201376A (en) * 1992-04-22 1993-04-13 Dresser Industries, Inc. Rock bit with improved gage insert
US5322138A (en) * 1991-08-14 1994-06-21 Smith International, Inc. Chisel insert for rock bits
US5421423A (en) * 1994-03-22 1995-06-06 Dresser Industries, Inc. Rotary cone drill bit with improved cutter insert
US5592995A (en) * 1995-06-06 1997-01-14 Baker Hughes Incorporated Earth-boring bit having shear-cutting heel elements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058177A (en) * 1976-03-29 1977-11-15 Dresser Industries, Inc. Asymmetric gage insert for an earth boring apparatus
US4334586A (en) * 1980-06-05 1982-06-15 Reed Rock Bit Company Inserts for drilling bits
US5322138A (en) * 1991-08-14 1994-06-21 Smith International, Inc. Chisel insert for rock bits
US5201376A (en) * 1992-04-22 1993-04-13 Dresser Industries, Inc. Rock bit with improved gage insert
US5421423A (en) * 1994-03-22 1995-06-06 Dresser Industries, Inc. Rotary cone drill bit with improved cutter insert
US5592995A (en) * 1995-06-06 1997-01-14 Baker Hughes Incorporated Earth-boring bit having shear-cutting heel elements

Also Published As

Publication number Publication date
GB2330605B (en) 2000-08-16
CA2257932A1 (en) 1997-12-24
GB2330605A (en) 1999-04-28
GB9826997D0 (en) 1999-02-03
WO1997048874A2 (en) 1997-12-24
CA2257932C (en) 2006-01-24
AU3497597A (en) 1998-01-07

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