EP1006257A3 - A drag-type Rotary Drill Bit - Google Patents

A drag-type Rotary Drill Bit Download PDF

Info

Publication number
EP1006257A3
EP1006257A3 EP99309665A EP99309665A EP1006257A3 EP 1006257 A3 EP1006257 A3 EP 1006257A3 EP 99309665 A EP99309665 A EP 99309665A EP 99309665 A EP99309665 A EP 99309665A EP 1006257 A3 EP1006257 A3 EP 1006257A3
Authority
EP
European Patent Office
Prior art keywords
pads
bit
formation
disposed
outer profile
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
EP99309665A
Other languages
German (de)
French (fr)
Other versions
EP1006257A2 (en
EP1006257B1 (en
Inventor
Douglas Caraway
Robin Macmillan
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.)
ReedHycalog UK Ltd
Original Assignee
Camco 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 US09/444,072 external-priority patent/US6193000B1/en
Priority claimed from US09/447,059 external-priority patent/US6371226B1/en
Application filed by Camco International Inc filed Critical Camco International Inc
Publication of EP1006257A2 publication Critical patent/EP1006257A2/en
Publication of EP1006257A3 publication Critical patent/EP1006257A3/en
Application granted granted Critical
Publication of EP1006257B1 publication Critical patent/EP1006257B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • 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
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Abstract

There is provided a rotary drag-type drill bit comprising a bit body (8) having a leading surface (10) comprising a plurality of pads (11), at least some of the pads (11) each having a wearable abrasive surface including particles of superhard material and defining an outer profile of the pad, at least a part of the outer profile of at least one of the pads (11) being disposed inwardly or outwardly of the outer profile of the other pads (11). With this arrangement, during initial drilling through softer formation, most of the removal of formation will be effected by the outermost of the abrasive pads (11) and little or no formation will be removed by the more inward pads (11). Accordingly, the bit will act as a lighter set bit and good rates of penetration may be achieved. As drilling proceeds and the bit wears, which may occur more rapidly as the bit meets harder formations, the more outwardly disposed pads (11) will wear down more than the inwardly disposed pads (11) so that the inwardly disposed pads (11) will begin to contribute more to the cutting action of the bit, so that the bit effectively becomes heavier set. As drilling progresses to a point where all of the pads (11) wear down to the same level, the bit will then act as a conventional heavy set bit where all the abrasive surfaces lie on the same profile.
EP99309665A 1998-12-04 1999-12-01 A drag-type Rotary Drill Bit Expired - Lifetime EP1006257B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US447059 1982-12-06
US11085398P 1998-12-04 1998-12-04
US110853P 1998-12-04
US09/444,072 US6193000B1 (en) 1999-11-22 1999-11-22 Drag-type rotary drill bit
US444072 1999-11-22
US09/447,059 US6371226B1 (en) 1998-12-04 1999-11-22 Drag-type rotary drill bit

Publications (3)

Publication Number Publication Date
EP1006257A2 EP1006257A2 (en) 2000-06-07
EP1006257A3 true EP1006257A3 (en) 2000-09-13
EP1006257B1 EP1006257B1 (en) 2004-02-25

Family

ID=27380915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99309665A Expired - Lifetime EP1006257B1 (en) 1998-12-04 1999-12-01 A drag-type Rotary Drill Bit

Country Status (2)

Country Link
EP (1) EP1006257B1 (en)
DE (1) DE69915009T2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8857541B2 (en) 2009-08-07 2014-10-14 Smith International, Inc. Diamond transition layer construction with improved thickness ratio
CA2770306A1 (en) 2009-08-07 2011-02-10 Smith International, Inc. Functionally graded polycrystalline diamond insert
EP2462310A4 (en) 2009-08-07 2014-04-02 Smith International Method of forming a thermally stable diamond cutting element
CN105422014B (en) 2009-08-07 2018-03-13 史密斯国际有限公司 Cutting element
AU2010279366B2 (en) 2009-08-07 2016-09-15 Smith International, Inc. Polycrystalline diamond material with high toughness and high wear resistance
US9482056B2 (en) 2011-12-30 2016-11-01 Smith International, Inc. Solid PCD cutter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1555163A (en) * 1968-02-23 1969-01-24
US4128136A (en) * 1977-12-09 1978-12-05 Lamage Limited Drill bit
EP0314953A2 (en) * 1984-07-19 1989-05-10 Camco Drilling Group Limited Improvements in or relating to rotary drill bits
EP0554568A2 (en) * 1992-01-06 1993-08-11 Baker Hughes Incorporated Mosaic diamond drag bit cutter having a nonuniform wear pattern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1555163A (en) * 1968-02-23 1969-01-24
US4128136A (en) * 1977-12-09 1978-12-05 Lamage Limited Drill bit
EP0314953A2 (en) * 1984-07-19 1989-05-10 Camco Drilling Group Limited Improvements in or relating to rotary drill bits
EP0554568A2 (en) * 1992-01-06 1993-08-11 Baker Hughes Incorporated Mosaic diamond drag bit cutter having a nonuniform wear pattern

Also Published As

Publication number Publication date
EP1006257A2 (en) 2000-06-07
DE69915009D1 (en) 2004-04-01
EP1006257B1 (en) 2004-02-25
DE69915009T2 (en) 2004-12-30

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