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GB2319549A - Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty - Google Patents

Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty

Info

Publication number
GB2319549A
GB2319549A GB9802230A GB9802230A GB2319549A GB 2319549 A GB2319549 A GB 2319549A GB 9802230 A GB9802230 A GB 9802230A GB 9802230 A GB9802230 A GB 9802230A GB 2319549 A GB2319549 A GB 2319549A
Authority
GB
United Kingdom
Prior art keywords
cutter elements
cutting
duty
cutter
enhancements
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9802230A
Other versions
GB2319549B (en
GB9802230D0 (en
Inventor
Gary Edward Portwood
Gary Edward Garcia
James Carl Minikus
Per Ivar Nese
Dennis Cisneros
Chris Edward Cawthorne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smith International Inc
Original Assignee
Smith International Inc
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 US08/630,517 external-priority patent/US6390210B1/en
Application filed by Smith International Inc filed Critical Smith International Inc
Publication of GB9802230D0 publication Critical patent/GB9802230D0/en
Publication of GB2319549A publication Critical patent/GB2319549A/en
Application granted granted Critical
Publication of GB2319549B publication Critical patent/GB2319549B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

A rolling cone bit (10) includes a cone cutter (14, 15, 16) having a pair of adjacent rows of cutter elements (70, 80) that are positioned so as to divide the sidewall (5) and bottom hole (7) duty. The wear resistance, hardness and toughness of the cutter elements (70, 80) in the adjacent rows are optimized depending upon the type of cutting the respective rows perform. In most applications, the cutter elements (70) experiencing the sidewall cutting will have cutting surfaces that are more resistant or harder than the cutting surfaces of the cutter elements (80) in the rows experiencing more bottom hole duty. Likewise, the cutter elements (80) exposed to the bottom hole duty will generally be tougher than those (70) experiencing substantial sidewall cutting. The material enhancements include varying the grades of tungsten carbide used in the cutter elements (70, 80) and by selectively employing layers of superhard abrasives, such as PCD or PCBN. The cutter elements (70, 80) may be either inserts or steel teeth.
GB9802230A 1996-04-10 1997-04-10 Earth boring bit Expired - Fee Related GB2319549B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/630,517 US6390210B1 (en) 1996-04-10 1996-04-10 Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty
US08/667,758 US5833020A (en) 1996-04-10 1996-06-21 Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty
PCT/US1997/005948 WO1997038205A1 (en) 1996-04-10 1997-04-10 Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty

Publications (3)

Publication Number Publication Date
GB9802230D0 GB9802230D0 (en) 1998-04-01
GB2319549A true GB2319549A (en) 1998-05-27
GB2319549B GB2319549B (en) 2000-09-06

Family

ID=27091174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9802230A Expired - Fee Related GB2319549B (en) 1996-04-10 1997-04-10 Earth boring bit

Country Status (5)

Country Link
AU (1) AU2725997A (en)
CA (1) CA2228156C (en)
GB (1) GB2319549B (en)
SE (1) SE9800295L (en)
WO (1) WO1997038205A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343905A (en) * 1998-11-20 2000-05-24 Smith International Roller cone bit
GB2362905A (en) * 2000-05-18 2001-12-05 Smith International Earth boring bit
GB2378725A (en) * 1998-11-20 2003-02-19 Smith International A roller cone drill bit for hard formations having a high offset

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5979575A (en) * 1998-06-25 1999-11-09 Baker Hughes Incorporated Hybrid rock bit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353885A (en) * 1991-05-01 1994-10-11 Smith International, Inc. Rock bit
US5542485A (en) * 1993-07-08 1996-08-06 Baker Hughes Incorporated Earth-boring bit with improved cutting structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353885A (en) * 1991-05-01 1994-10-11 Smith International, Inc. Rock bit
US5542485A (en) * 1993-07-08 1996-08-06 Baker Hughes Incorporated Earth-boring bit with improved cutting structure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343905A (en) * 1998-11-20 2000-05-24 Smith International Roller cone bit
US6345673B1 (en) 1998-11-20 2002-02-12 Smith International, Inc. High offset bits with super-abrasive cutters
GB2378725A (en) * 1998-11-20 2003-02-19 Smith International A roller cone drill bit for hard formations having a high offset
GB2378725B (en) * 1998-11-20 2003-06-11 Smith International Earth boring bit
GB2343905B (en) * 1998-11-20 2003-06-18 Smith International Earth boring bit
US6863138B2 (en) 1998-11-20 2005-03-08 Smith International, Inc. High offset bits with super-abrasive cutters
GB2362905A (en) * 2000-05-18 2001-12-05 Smith International Earth boring bit
US6651758B2 (en) 2000-05-18 2003-11-25 Smith International, Inc. Rolling cone bit with elements fanned along the gage curve
GB2362905B (en) * 2000-05-18 2004-09-15 Smith International Earth-boring bit

Also Published As

Publication number Publication date
GB2319549B (en) 2000-09-06
AU2725997A (en) 1997-10-29
CA2228156C (en) 2006-08-22
WO1997038205A1 (en) 1997-10-16
SE9800295D0 (en) 1998-02-02
GB9802230D0 (en) 1998-04-01
SE9800295L (en) 1998-02-10
CA2228156A1 (en) 1997-10-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150410