MX151243A - Mejoras en barrena giratoria para perforar pozos - Google Patents

Mejoras en barrena giratoria para perforar pozos

Info

Publication number
MX151243A
MX151243A MX181581A MX18158180A MX151243A MX 151243 A MX151243 A MX 151243A MX 181581 A MX181581 A MX 181581A MX 18158180 A MX18158180 A MX 18158180A MX 151243 A MX151243 A MX 151243A
Authority
MX
Mexico
Prior art keywords
drilling wells
rotating drill
drill
rotating
wells
Prior art date
Application number
MX181581A
Other languages
English (en)
Inventor
Cornelius Phaal
Rainer Jurgens
Original Assignee
Christensen 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 DE2910347A external-priority patent/DE2910347C2/de
Application filed by Christensen Inc filed Critical Christensen Inc
Publication of MX151243A publication Critical patent/MX151243A/es

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
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/148—Composition of the cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/30—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools lathes or like tools
    • 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
    • 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
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • 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
    • E21B10/58—Chisel-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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/31—Diamond
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (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)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Earth Drilling (AREA)
MX181581A 1979-03-16 1980-03-14 Mejoras en barrena giratoria para perforar pozos MX151243A (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2910347A DE2910347C2 (de) 1978-04-21 1979-03-16 Drehbohrmeißel für Tiefbohrungen im Gestein

Publications (1)

Publication Number Publication Date
MX151243A true MX151243A (es) 1984-10-24

Family

ID=6065567

Family Applications (1)

Application Number Title Priority Date Filing Date
MX181581A MX151243A (es) 1979-03-16 1980-03-14 Mejoras en barrena giratoria para perforar pozos

Country Status (4)

Country Link
US (1) US4373593A (es)
JP (1) JPS55129586A (es)
CA (1) CA1132971A (es)
MX (1) MX151243A (es)

Families Citing this family (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6129832Y2 (es) * 1979-05-18 1986-09-02
DE3114749C2 (de) * 1981-04-11 1983-10-27 Christensen, Inc., 84115 Salt Lake City, Utah Keilförmiges Schneidglied für Drehbohrmeißel zum Tiefbohren
US4550790A (en) * 1983-02-28 1985-11-05 Norton Christensen, Inc. Diamond rotating bit
US4491188A (en) * 1983-03-07 1985-01-01 Norton Christensen, Inc. Diamond cutting element in a rotating bit
US4515226A (en) * 1983-03-07 1985-05-07 Norton Christensen, Inc. Tooth design to avoid shearing stresses
US4499959A (en) * 1983-03-14 1985-02-19 Christensen, Inc. Tooth configuration for an earth boring bit
AU2568884A (en) * 1983-03-21 1984-09-27 Norton Christensen Inc. Teeth for drill bit
US4586574A (en) * 1983-05-20 1986-05-06 Norton Christensen, Inc. Cutter configuration for a gage-to-shoulder transition and face pattern
US4550791A (en) * 1983-10-03 1985-11-05 Kennametal Inc. Two-prong rotary bit, especially for use with roof drills, and insert therefor
US4533004A (en) * 1984-01-16 1985-08-06 Cdp, Ltd. Self sharpening drag bit for sub-surface formation drilling
GB8432587D0 (en) * 1984-12-22 1985-02-06 Nl Petroleum Prod Cutting elements for rotary drill bits
US4702649A (en) * 1986-02-27 1987-10-27 General Electric Company Polycrystalline diamond and CBN cutting tools
US4714385A (en) * 1986-02-27 1987-12-22 General Electric Company Polycrystalline diamond and CBN cutting tools
GB2188354B (en) * 1986-03-27 1989-11-22 Shell Int Research Rotary drill bit
FR2620487B1 (fr) * 1987-09-14 1989-12-01 Vennin Henri Trepan de forage monobloc rotatif
US4858706A (en) * 1987-09-15 1989-08-22 Lebourgh Maurice P Diamond drill bit with hemispherically shaped diamond inserts
EP0336697B1 (en) * 1988-04-05 1993-11-10 Camco Drilling Group Limited Cutting element for a rotary drill bit, and method for manufacturing such an element
GB2251879B (en) * 1988-04-05 1992-11-11 Camco Drilling Group Ltd Improvements in or relating to cutting elements for rotary drill bits
ATE114356T1 (de) * 1988-08-15 1994-12-15 De Beers Ind Diamond Werkzeugeinsatz.
GB8907618D0 (en) * 1989-04-05 1989-05-17 Morrison Pumps Sa Drilling
US5092310A (en) * 1989-05-23 1992-03-03 General Electric Company Mining pick
US4989578A (en) * 1989-08-30 1991-02-05 Lebourg Maurice P Method for forming diamond cutting elements for a diamond drill bit
US5183362A (en) * 1990-01-10 1993-02-02 Nippon Oil And Fats Co., Ltd. Cutting tool assembly
KR950000166B1 (ko) * 1990-01-10 1995-01-11 니흥유지 가부시끼가이샤 절삭공구 조립체
US5115873A (en) * 1991-01-24 1992-05-26 Baker Hughes Incorporated Method and appartus for directing drilling fluid to the cutting edge of a cutter
US5348108A (en) * 1991-03-01 1994-09-20 Baker Hughes Incorporated Rolling cone bit with improved wear resistant inserts
US5159857A (en) * 1991-03-01 1992-11-03 Hughes Tool Company Fixed cutter bit with improved diamond filled compacts
US5355750A (en) * 1991-03-01 1994-10-18 Baker Hughes Incorporated Rolling cone bit with improved wear resistant inserts
US5119714A (en) * 1991-03-01 1992-06-09 Hughes Tool Company Rotary rock bit with improved diamond filled compacts
US5248006A (en) * 1991-03-01 1993-09-28 Baker Hughes Incorporated Rotary rock bit with improved diamond-filled compacts
US5273125A (en) * 1991-03-01 1993-12-28 Baker Hughes Incorporated Fixed cutter bit with improved diamond filled compacts
US5247923A (en) * 1992-03-09 1993-09-28 Lebourg Maurice P Method of forming a diamond drill bit element using laser trimming
US5429199A (en) * 1992-08-26 1995-07-04 Kennametal Inc. Cutting bit and cutting insert
EP0707130B1 (en) * 1994-10-15 2003-07-16 Camco Drilling Group Limited Rotary drill bits
US5533582A (en) * 1994-12-19 1996-07-09 Baker Hughes, Inc. Drill bit cutting element
FR2735522B1 (fr) * 1995-06-16 1997-09-05 Total Sa Taillant d'outil de forage monobloc
GB9708022D0 (en) * 1997-04-21 1997-06-11 Camco Int Uk Ltd Curved blades and gauge
US6135681A (en) * 1998-08-21 2000-10-24 Allied Machine & Engineering Flat bottom tool
US6146476A (en) * 1999-02-08 2000-11-14 Alvord-Polk, Inc. Laser-clad composite cutting tool and method
US6843333B2 (en) * 1999-11-29 2005-01-18 Baker Hughes Incorporated Impregnated rotary drag bit
US6510906B1 (en) * 1999-11-29 2003-01-28 Baker Hughes Incorporated Impregnated bit with PDC cutters in cone area
US6258139B1 (en) * 1999-12-20 2001-07-10 U S Synthetic Corporation Polycrystalline diamond cutter with an integral alternative material core
US6592985B2 (en) 2000-09-20 2003-07-15 Camco International (Uk) Limited Polycrystalline diamond partially depleted of catalyzing material
DE60140617D1 (de) 2000-09-20 2010-01-07 Camco Int Uk Ltd Polykristalliner diamant mit einer an katalysatormaterial abgereicherten oberfläche
CA2489187C (en) * 2003-12-05 2012-08-28 Smith International, Inc. Thermally-stable polycrystalline diamond materials and compacts
US7726420B2 (en) * 2004-04-30 2010-06-01 Smith International, Inc. Cutter having shaped working surface with varying edge chamfer
US7647993B2 (en) * 2004-05-06 2010-01-19 Smith International, Inc. Thermally stable diamond bonded materials and compacts
US7754333B2 (en) * 2004-09-21 2010-07-13 Smith International, Inc. Thermally stable diamond polycrystalline diamond constructions
US7608333B2 (en) * 2004-09-21 2009-10-27 Smith International, Inc. Thermally stable diamond polycrystalline diamond constructions
JP4713930B2 (ja) * 2005-01-07 2011-06-29 大成建設株式会社 浚渫装置
US7681669B2 (en) * 2005-01-17 2010-03-23 Us Synthetic Corporation Polycrystalline diamond insert, drill bit including same, and method of operation
US7350601B2 (en) * 2005-01-25 2008-04-01 Smith International, Inc. Cutting elements formed from ultra hard materials having an enhanced construction
US8197936B2 (en) * 2005-01-27 2012-06-12 Smith International, Inc. Cutting structures
GB2454122B (en) 2005-02-08 2009-07-08 Smith International Thermally stable polycrystalline diamond cutting elements and bits incorporating the same
US7493973B2 (en) 2005-05-26 2009-02-24 Smith International, Inc. Polycrystalline diamond materials having improved abrasion resistance, thermal stability and impact resistance
US7377341B2 (en) * 2005-05-26 2008-05-27 Smith International, Inc. Thermally stable ultra-hard material compact construction
US8020643B2 (en) 2005-09-13 2011-09-20 Smith International, Inc. Ultra-hard constructions with enhanced second phase
US7726421B2 (en) 2005-10-12 2010-06-01 Smith International, Inc. Diamond-bonded bodies and compacts with improved thermal stability and mechanical strength
US7506698B2 (en) * 2006-01-30 2009-03-24 Smith International, Inc. Cutting elements and bits incorporating the same
US7628234B2 (en) * 2006-02-09 2009-12-08 Smith International, Inc. Thermally stable ultra-hard polycrystalline materials and compacts
US8066087B2 (en) 2006-05-09 2011-11-29 Smith International, Inc. Thermally stable ultra-hard material compact constructions
US9097074B2 (en) * 2006-09-21 2015-08-04 Smith International, Inc. Polycrystalline diamond composites
US8002859B2 (en) * 2007-02-06 2011-08-23 Smith International, Inc. Manufacture of thermally stable cutting elements
US7942219B2 (en) * 2007-03-21 2011-05-17 Smith International, Inc. Polycrystalline diamond constructions having improved thermal stability
US8499861B2 (en) * 2007-09-18 2013-08-06 Smith International, Inc. Ultra-hard composite constructions comprising high-density diamond surface
US7980334B2 (en) * 2007-10-04 2011-07-19 Smith International, Inc. Diamond-bonded constructions with improved thermal and mechanical properties
US7730976B2 (en) * 2007-10-31 2010-06-08 Baker Hughes Incorporated Impregnated rotary drag bit and related methods
US9297211B2 (en) 2007-12-17 2016-03-29 Smith International, Inc. Polycrystalline diamond construction with controlled gradient metal content
US8083012B2 (en) * 2008-10-03 2011-12-27 Smith International, Inc. Diamond bonded construction with thermally stable region
US8342780B2 (en) * 2008-10-17 2013-01-01 Precorp, Inc. Shielded PCD or PCBN cutting tools
WO2010117765A1 (en) * 2009-03-30 2010-10-14 Schlumberger Canada Limited Double sintered thermally stable polycrystalline diamond cutting elements
US7972395B1 (en) 2009-04-06 2011-07-05 Us Synthetic Corporation Superabrasive articles and methods for removing interstitial materials from superabrasive materials
US8951317B1 (en) 2009-04-27 2015-02-10 Us Synthetic Corporation Superabrasive elements including ceramic coatings and methods of leaching catalysts from superabrasive elements
GB2481957B (en) * 2009-05-06 2014-10-15 Smith International Methods of making and attaching tsp material for forming cutting elements, cutting elements having such tsp material and bits incorporating such cutting
CN102414394B (zh) 2009-05-06 2015-11-25 史密斯国际有限公司 具有再加工的热稳定多晶金刚石切割层的切割元件，结合有其的钻头，及其制造方法
US8783389B2 (en) * 2009-06-18 2014-07-22 Smith International, Inc. Polycrystalline diamond cutting elements with engineered porosity and method for manufacturing such cutting elements
US9352447B2 (en) 2009-09-08 2016-05-31 Us Synthetic Corporation Superabrasive elements and methods for processing and manufacturing the same using protective layers
US8561727B1 (en) * 2009-10-28 2013-10-22 Us Synthetic Corporation Superabrasive cutting elements and systems and methods for manufacturing the same
US8505634B2 (en) * 2009-12-28 2013-08-13 Baker Hughes Incorporated Earth-boring tools having differing cutting elements on a blade and related methods
SI2519378T1 (sl) 2009-12-31 2014-02-28 Diamond Innovations, Inc. Surovec za izdelavo obdelovalnega orodja in postopek uporabe surovca za izdelavo obdelovalnega orodja
WO2011097575A2 (en) * 2010-02-05 2011-08-11 Baker Hughes Incorporated Shaped cutting elements on drill bits and other earth-boring tools, and methods of forming same
US8851207B2 (en) 2011-05-05 2014-10-07 Baker Hughes Incorporated Earth-boring tools and methods of forming such earth-boring tools
US8662208B2 (en) * 2010-06-17 2014-03-04 American National Carbide Co. Downhole cutting tool, cutting elements and method
SA111320671B1 (ar) 2010-08-06 2015-01-22 بيكر هوغيس انكور عوامل القطع المشكلة لادوات ثقب الارض و ادوات ثقب الارض شاملة عوامل القطع هذه و الطرق المختصة بها
US8858665B2 (en) 2011-04-28 2014-10-14 Robert Frushour Method for making fine diamond PDC
US8741010B2 (en) 2011-04-28 2014-06-03 Robert Frushour Method for making low stress PDC
US8974559B2 (en) 2011-05-12 2015-03-10 Robert Frushour PDC made with low melting point catalyst
US9061264B2 (en) 2011-05-19 2015-06-23 Robert H. Frushour High abrasion low stress PDC
US8828110B2 (en) 2011-05-20 2014-09-09 Robert Frushour ADNR composite
US9144886B1 (en) 2011-08-15 2015-09-29 Us Synthetic Corporation Protective leaching cups, leaching trays, and methods for processing superabrasive elements using protective leaching cups and leaching trays
IN2014DN06671A (es) 2012-02-08 2015-05-22 Baker Hughes Inc
RU2014122863A (ru) 2012-06-13 2015-12-10 Варел Интернэшнл Инд., Л.П. Поликристаллические алмазные резцы повышенной прочности и термостойкости
CN103157797B (zh) * 2013-03-19 2016-05-04 富耐克超硬材料股份有限公司 刀头毛坯及其合成工艺及其合成模具及刀头生产方法
US9550276B1 (en) 2013-06-18 2017-01-24 Us Synthetic Corporation Leaching assemblies, systems, and methods for processing superabrasive elements
US9789587B1 (en) 2013-12-16 2017-10-17 Us Synthetic Corporation Leaching assemblies, systems, and methods for processing superabrasive elements
US10807913B1 (en) 2014-02-11 2020-10-20 Us Synthetic Corporation Leached superabrasive elements and leaching systems methods and assemblies for processing superabrasive elements
US9908215B1 (en) 2014-08-12 2018-03-06 Us Synthetic Corporation Systems, methods and assemblies for processing superabrasive materials
US11766761B1 (en) 2014-10-10 2023-09-26 Us Synthetic Corporation Group II metal salts in electrolytic leaching of superabrasive materials
US10011000B1 (en) 2014-10-10 2018-07-03 Us Synthetic Corporation Leached superabrasive elements and systems, methods and assemblies for processing superabrasive materials
US10723626B1 (en) 2015-05-31 2020-07-28 Us Synthetic Corporation Leached superabrasive elements and systems, methods and assemblies for processing superabrasive materials
US10900291B2 (en) 2017-09-18 2021-01-26 Us Synthetic Corporation Polycrystalline diamond elements and systems and methods for fabricating the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952002A (en) * 1933-04-22 1934-03-20 Jessop Steel Company Process of manufacturing composite steel articles
US2275021A (en) * 1938-07-01 1942-03-03 Budd Induction Heating Inc Process of making tools
GB529529A (en) * 1939-06-02 1940-11-22 J K Smit & Sons Inc Art of setting diamonds and making diamond tools
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
CH386365A (fr) * 1961-11-24 1965-01-15 Diamant Boart Sa Couronne de sondage
US3702573A (en) * 1969-03-19 1972-11-14 Kennametal Inc Cermet product and method and apparatus for the manufacture thereof
US3745623A (en) * 1971-12-27 1973-07-17 Gen Electric Diamond tools for machining
DE2719330C3 (de) * 1977-04-30 1984-01-05 Christensen, Inc., 84115 Salt Lake City, Utah Drehbohrmeißel

Also Published As

Publication number Publication date
JPS55129586A (en) 1980-10-07
CA1132971A (en) 1982-10-05
JPS638274B2 (es) 1988-02-22
US4373593A (en) 1983-02-15

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