EP2318638A2 - Cône de trépan avec embout à revêtement dur - Google Patents

Cône de trépan avec embout à revêtement dur

Info

Publication number
EP2318638A2
EP2318638A2 EP09807332A EP09807332A EP2318638A2 EP 2318638 A2 EP2318638 A2 EP 2318638A2 EP 09807332 A EP09807332 A EP 09807332A EP 09807332 A EP09807332 A EP 09807332A EP 2318638 A2 EP2318638 A2 EP 2318638A2
Authority
EP
European Patent Office
Prior art keywords
cutter
compacts
bit
row
metal shell
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.)
Withdrawn
Application number
EP09807332A
Other languages
German (de)
English (en)
Inventor
Floyd C. Felderhoff
Mark A. Freeman
Alan J. Massey
Kenneth E. Gilmore
Glen Stanfield
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.)
Baker Hughes Holdings LLC
Original Assignee
Baker Hughes 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
Application filed by Baker Hughes Inc filed Critical Baker Hughes Inc
Publication of EP2318638A2 publication Critical patent/EP2318638A2/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • This invention relates to improvements to earth-boring bits having rotating cones with cutting structures and in particular to hardfacing a spear point to enhance wear resistance.
  • rock bits fitted with one, two or three rolling cutters are employed.
  • the bit is s secured to the lower end of a drill string that is rotated from the surface, or the bit is rotated by downhole motor or turbines.
  • the cutters mounted on the bit roll and slide upon the bottom of the bore hole as the bit is rotated, thereby engaging and disengaging the formation material to be removed.
  • the roller cutters are provides with cutting elements that are forced to penetrate and gouge the bottom of the borehole by weights of the drill string. The cuttings from the bottom and sidewalls of the borehole are washed away by drilling fluid that is pumped down from the surface through the hollow drill string.
  • Tungsten carbide is metal which is harder than the steel body of the cutter and has a cylindrical portion and a cutting tip portion.
  • the cutting tip portion is formed in various configurations, such as chisel, hemispherical or conical, depending upon the type of formation to be drilled.
  • Another type of rolling cutter earth-boring bit is commonly known as a "steel-tooth” or “milled-tooth” bit.
  • these bits are for penetration into relatively soft geological formations of the earth.
  • the strength and fracture-toughness of the steel teeth permits the use of relatively long teeth, which enables the aggressive gouging and scraping actions that are advantageous for rapid penetration of soft formations with low compressive strengths.
  • geological formations consist entirely of soft material
  • hardfacing typically consists of extremely hard particles, such as sintered, cast, or macro-crystalline tungsten carbide, dispersed in a steel matrix. Such hardfacing materials are applied by welding a metallic matrix to the surface to be hardfaced and applying the hard particles to the matrix to form a
  • FIG. 1 shows a prior art earth-boring bit 11, having a body 13 with three bit legs 15 depending therefrom. A cone 17 is rotatably mounted to each of the bit legs 15.
  • HOUSTON ⁇ 2305830 ! -> 17 is formed of a steel shell or body.
  • Each cone 17 has a plurality of inner row compacts or carbide inserts 19, arranged in at least one inner row.
  • a plurality of outer or heel row compacts 21 are adjacent to a gage surface 23 of each cone 17. It is common for cones 17 to have different numbers of rows. In the embodiment shown, heel row compacts 21 are generally ovoid, although different shapes could be used.
  • the bit has a cutter which has tungsten carbide inserts and a spear point.
  • the spear point has a neck that joins a smooth portion of the cutter and blades that extend from the neck and converge to an apex.
  • the blades define valleys or spaces between them.
  • a layer of hardfacing is applied to the entire spear point including the interim spaces and the neck.
  • This hardfacing may be of a conventional type comprising tungsten carbide particles in a steel alloy matrix.
  • Figure 1 is a side elevation of a prior art earth-boring bit.
  • Figure 2 is a bottom view of an earth-boring bit having a cone hardfaced in accordance with this invention. Detailed Description of the Invention
  • bit 27 of this invention has a body, bit legs, and a threaded section that are not shown but may be the same as in prior art bit 1 1 of Figure 1.
  • Bit 27 has a first cone 29, a second cone 31, and a third cone 33.
  • Each cone 29, 31, 33 has a plurality of compacts 35 located on outer and inner rows.
  • Inserts 37 are also located along the inner and outer rows of each cone 29, 31, 33.
  • Compacts 35 are formed of cemented carbide, typically tungsten carbide that is usually homogenous and formed in a die and consolidated by sintering techniques.
  • at least one layer of diamond may be formed on the cutting
  • portions of the carbide material placed in the die and sintered may be of different grades.
  • First cone 29 has an outer row 39 and an intermediate row 41 of compacts 35, which are located adjacent the gage surface of first cone 29.
  • An inner row 43 is located a short distance inward from intermediate row 41 toward the bit axis.
  • a thin annular conical band 45 is located between intermediate row 41 and inner row 43.
  • First cone 29 has a spear point 47 that is conventional and comprises radially extending blades.
  • a layer of hardfacing 49 is applied over spear 47 and a segment of a nose section 50 of cone 29.
  • a conical surface 51 extends from inner row 43 to the neck portion of spear point 47.
  • a layer of hardfacing 49 may be applied to a portion of conical surface 51 near the neck portion of spear 47.
  • the hardfacing 49 of spear 47 reduces the amount of wear in the nose area 50.
  • Hardfacing 49, combined with the use of compacts 35 on inner row 43, intermediate row 41, and outer rows 39 reduces the total amount of wear of cone 29.
  • Second cone 31 has an outer row 53 and an intermediate row 55 of compacts 35.
  • the nose portion 56 of cone 31 extends axially from intermediate row 55, forming conical band 57.
  • an inner row 59 of compacts 35 are located on the nose portion 56 of cone 31.
  • milled steel teeth could be formed on the nose portion 56 of cone 31, in place of compacts 35 on inner row 59. If an inner row of steel teeth were formed on the nose portion 56 of cone 31, hardfacing could be applied over the teeth and sections of the nose portion 56 of cone 31 and conical band 57.
  • Third cone 33 has an outer row 61 and an intermediate row 63 of compacts 35. The nose portion of cone 33 extends axially from intermediate row 63, forming conical band 65.
  • an inner row 67 of compacts 35 are located on the nose portion of cone 33.
  • An additional set of small compacts 68 are located on the end 69 of the nose portion of cone 33.
  • milled steel teeth could be formed on the nose portion of cone 33, in
  • bit 27 is run conventionally.
  • the combination of compacts 35, inserts 37, and hardfacing 49 applied to the nose section 50 of cone 29 reduces wear and erosion, increasing the life of the bit 27. While the invention has been shown in only one of its forms, it should be apparent to those skilled in the art that it is not so limited but is susceptible to various changes without departing from the scope of the invention.

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)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un trépan pour forer un puits de forage, le trépan ayant un dispositif de découpe qui a des inserts de carbure de tungstène, et une pointe de harpon. La pointe perçante a un col qui rejoint une partie lisse du dispositif de découpe, et des lames qui s'étendent depuis le col et convergent vers un sommet. Les lames définissent des vallées ou espaces entre celles-ci. Une couche de revêtement dur est appliquée sur toute la pointe de harpon, y compris les espaces intermédiaire et le col.
EP09807332A 2008-08-14 2009-08-14 Cône de trépan avec embout à revêtement dur Withdrawn EP2318638A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8899108P 2008-08-14 2008-08-14
PCT/US2009/053801 WO2010019834A2 (fr) 2008-08-14 2009-08-14 Cône de trépan avec embout à revêtement dur

Publications (1)

Publication Number Publication Date
EP2318638A2 true EP2318638A2 (fr) 2011-05-11

Family

ID=41669700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09807332A Withdrawn EP2318638A2 (fr) 2008-08-14 2009-08-14 Cône de trépan avec embout à revêtement dur

Country Status (4)

Country Link
US (1) US20100038146A1 (fr)
EP (1) EP2318638A2 (fr)
CA (1) CA2733255A1 (fr)
WO (1) WO2010019834A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110168452A1 (en) * 2008-08-14 2011-07-14 Baker Hughes Incorporated Tungsten Carbide Bit with Hardfaced Nose Area
US9376866B2 (en) * 2013-08-23 2016-06-28 Varel International Ind., L.P. Hybrid rotary cone drill bit
US20160145945A1 (en) * 2014-11-25 2016-05-26 Smith International, Inc. Low collision damage bit
US10337272B2 (en) * 2016-02-16 2019-07-02 Varel International Ind., L.P. Hybrid roller cone and junk mill bit

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533259A (en) * 1946-06-28 1950-12-12 Hughes Tool Co Cluster tooth cutter
US3412817A (en) * 1965-11-10 1968-11-26 Continental Oil Co Roller cone drill bit
US3397751A (en) * 1966-03-02 1968-08-20 Continental Oil Co Asymmetric three-cone rock bit
US4256194A (en) * 1978-05-19 1981-03-17 Varel Manufacturing Company Rotary drill bit having a solid forged, unitary body
US4726432A (en) * 1987-07-13 1988-02-23 Hughes Tool Company-Usa Differentially hardfaced rock bit
US4940099A (en) * 1989-04-05 1990-07-10 Reed Tool Company Cutting elements for roller cutter drill bits
US5038640A (en) * 1990-02-08 1991-08-13 Hughes Tool Company Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits
DE69106964D1 (de) * 1990-07-10 1995-03-09 Smith International Zahnrollenmeissel mit Umfangsschneideinsätzen.
US5224560A (en) * 1990-10-30 1993-07-06 Modular Engineering Modular drill bit
US5353885A (en) * 1991-05-01 1994-10-11 Smith International, Inc. Rock bit
US5311958A (en) * 1992-09-23 1994-05-17 Baker Hughes Incorporated Earth-boring bit with an advantageous cutting structure
US5542485A (en) * 1993-07-08 1996-08-06 Baker Hughes Incorporated Earth-boring bit with improved cutting structure
US5351768A (en) * 1993-07-08 1994-10-04 Baker Hughes Incorporated Earth-boring bit with improved cutting structure
US5445231A (en) * 1994-07-25 1995-08-29 Baker Hughes Incorporated Earth-burning bit having an improved hard-faced tooth structure
JP3010430U (ja) * 1994-10-20 1995-05-02 石油鑿井機製作株式会社 ドリルビット
US6390210B1 (en) * 1996-04-10 2002-05-21 Smith International, Inc. Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty
US5979575A (en) * 1998-06-25 1999-11-09 Baker Hughes Incorporated Hybrid rock bit
US6401839B1 (en) * 1998-08-31 2002-06-11 Halliburton Energy Services, Inc. Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation
US6253862B1 (en) * 1999-02-03 2001-07-03 Baker Hughes Incorporated Earth-boring bit with cutter spear point hardfacing
US7343990B2 (en) * 2006-06-08 2008-03-18 Baker Hughes Incorporated Rotary rock bit with hardfacing to reduce cone erosion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010019834A2 *

Also Published As

Publication number Publication date
WO2010019834A3 (fr) 2010-06-03
US20100038146A1 (en) 2010-02-18
WO2010019834A2 (fr) 2010-02-18
CA2733255A1 (fr) 2010-02-18

Similar Documents

Publication Publication Date Title
US10017998B2 (en) Drill bits and earth-boring tools including shaped cutting elements and associated methods
US20180230756A1 (en) Kerfing hybrid drill bit and other downhole cutting tools
US9458674B2 (en) Earth-boring tools including shaped cutting elements, and related methods
US8191657B2 (en) Rotary drag bits for cutting casing and drilling subterranean formations
US7950476B2 (en) Drill bit and cutter element having chisel crest with protruding pilot portion
US8028773B2 (en) Drill bit and cutter element having a fluted geometry
US10125550B2 (en) Orientation of cutting element at first radial position to cut core
GB2421042A (en) Drill bit with secondary cutters for hard formations
US10487588B2 (en) Percussion drill bit with at least one wear insert, related systems, and methods
US5979575A (en) Hybrid rock bit
US20100038146A1 (en) Bit Cone With Hardfaced Nose
US10301881B2 (en) Fixed cutter drill bit with multiple cutting elements at first radial position to cut core
US10012029B2 (en) Rolling cones with gage cutting elements, earth-boring tools carrying rolling cones with gage cutting elements and related methods
EP3363988B1 (fr) Foret imprégné comprenant un profil de lame plane le long de la face du foret
US11136830B2 (en) Downhole tools with variable cutting element arrays
US20110168452A1 (en) Tungsten Carbide Bit with Hardfaced Nose Area
GB2434391A (en) Drill bit with secondary cutters for hard formations

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110301

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20121105