WO2012006671A1 - Système de forage modulaire - Google Patents

Système de forage modulaire Download PDF

Info

Publication number
WO2012006671A1
WO2012006671A1 PCT/AU2011/000883 AU2011000883W WO2012006671A1 WO 2012006671 A1 WO2012006671 A1 WO 2012006671A1 AU 2011000883 W AU2011000883 W AU 2011000883W WO 2012006671 A1 WO2012006671 A1 WO 2012006671A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting portion
drill bit
tapered surface
male connecting
drill
Prior art date
Application number
PCT/AU2011/000883
Other languages
English (en)
Inventor
George Johan Strydom
Original Assignee
George Johan Strydom
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 AU2010903133A external-priority patent/AU2010903133A0/en
Application filed by George Johan Strydom filed Critical George Johan Strydom
Publication of WO2012006671A1 publication Critical patent/WO2012006671A1/fr

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
    • E21B10/36—Percussion drill bits
    • 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
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like

Definitions

  • a decline provides access to gold-bearing zones or stopes at various levels below ground.
  • the rock in a stope is blasted using suitable explosives to loosen the ore, which is then transported to the surface for processing.
  • a systematic pattern of holes is drilled in the rock face and packed with explosive to break-up the rock into transportable pieces.
  • Miners are responsible for drilling these holes with "jacklegs" or "jumbos.”
  • a jackleg is a hydraulic drilling machine operated manually by a miner, whereas a jumbo is a wheeled vehicle with multiple drills mounted thereon for drilling multiple holes simultaneously.
  • a drill bit for use with a male connecting portion of a drill rod assembly, the drill bit comprising:
  • a body extending in a longitudinal direction between a bit face at a forward end and a female connecting portion at a rear end;
  • the female connecting portion defining a socket comprising: a generally cylindrical tapered surface adapted to form a mating connection with a corresponding tapered surface of the male connecting portion;
  • each planar section extends substantially a full length of the tapered female connecting portion.
  • the generally cylindrical tapered surface is oriented at a first inclination to a longitudinal axis of the drill bit and the planar sections are oriented at a second inclination to the longitudinal axis of the drill bit which is greater than the first inclination.
  • a width of each planar section generally in the circumferential direction is reduced from the front end towards the rear end of the drill bit.
  • the first inclination is preferably less than 10 degrees and the second inclination is preferably within 3 degrees of the first inclination. More preferably, the first inclination is approximately 5 degrees and the second inclination is approximately 6 degrees such that the second inclination differs by approximately one degree from the first inclination.
  • the internal end face is adapted to positively engage the outer end face of the male connecting portion when the drill bit is subjected to percussive drilling forces from the drill rod assembly.
  • the male connecting portion includes the annular shoulder about the rear end thereof and the socket of the female connection portion comprises annular end face at the rear end, preferably the planar sections are oriented relative to the annular end face such that:
  • the annular end face is adapted to be spaced from the annular shoulder of the male connecting portion when the planar sections of the female connecting portion initially abut the planar sections of the male connecting portion;
  • the annular end face is adapted to positively engage the annular shoulder of the male connecting portion when the drill bit is subjected to percussive drilling forces from the drill rod assembly.
  • the body of the drill bit can be formed of a material having a greater hardness than the adapter.
  • the adapter can be made of a harder wearing material or material which is heat treated differently to ensure that the adapter lasts many times longer than the bit.
  • the drill bit preferably comprises a type in which the bit face includes a plurality of protrusions radially and circumferentially spaced from one another and being formed of a material having a greater hardness than the body of the drill bit.
  • each drill bit defining a socket comprising: a generally cylindrical tapered surface adapted to form a mating connection with a corresponding tapered surface of the male connecting portion;
  • the female connecting portions of the drill bits being substantially identical to one another;
  • a modular drilling system for use with a male connecting portion of a drill rod assembly, the system comprising:
  • an adapter having a rear end comprising a female connecting portion formed with an internal thread so as to be adapted to engage in screw-threaded engagement with a male portion of a threaded drill rod of the drill rod assembly and a forward end defining a common male connecting portion comprising:
  • each drill bit having a body extending in a longitudinal direction between a bit face at a forward end and a female connecting portion at a rear end, the bit faces of the plurality of auxiliary bits being different in size relative to one another, and the female connecting portion of each drill bit defining a socket comprising: a generally cylindrical tapered surface adapted to form a mating connection with the corresponding tapered surface of the common male connecting portion of the adapter; and
  • a planar section formed on the tapered surface of the female connecting portion in alignment with each of the planar sections of the male connecting portion of the adapter so as to be adapted to provide positive engagement of the planar sections of the drill bit with the corresponding planar sections of the male connecting portion of the adapter.
  • planar surfaces particularly when representing approximately 35% of the total load transfer area, provides for optimal rotational axis load torque to strengthen the male and female connection and allows for enough conical surface area for optimal load transfer of the percussive forces.
  • planar surfaces By arranging the planar surfaces to be bigger on the top of the cone and smaller down the shaft it allows for more material on the bit internally thus making the bit stronger and less prone to taper failures.
  • the increase in material is achieved by having the planar surface at an angle that is different from the conical tapered surface.
  • the 3 planar surfaces also tie in with the frequency of the percussion hammer and allow for the hole being drilled to have perfect geometry (round). If less than 3 planar sections are used, the frequency of the percussion hammer allows the bit load to misdirect and cause non circular holes to be drilled (oval or triangular).
  • planar angles and conical surface angles are also arranged to allow enough movement when drilling starts to ensure additional surfaces to meet for enhanced power transmission and still continue to allow the bind to be strong enough to hold the bit on the tapered connection. Otherwise the bit will shoot off the male taper end if the angles are too steep and the surfaces meet during drilling.
  • the bits are thus held onto the tapered drill rod by hammering so that a tight friction fit is the only thing retaining the bit on the tapered drill rod. By optimizing the angles used, the friction fit gets stronger. Friction and plastic deformation keeps the bind. When the deformation is at its limits however, critical a failure occurs.
  • the modular taper connection as described herein has the advantage of stopping the plastic deformation when the faces meet during drilling.
  • the adapter reduces material use and allows for different materials to be used so that one can put harder metal and harder working parts on an adaptor which can be made of cheaper material.
  • the modular profile and load transfer properties of the drill bit and corresponding male connecting portion of a drill rod or adapter in a drill rod assembly extends the bit size beyond the current head size range of bits and has additional load transfer faces only after the bit has started drilling. The advantages in the market place are:
  • tapered bits are used in limited low cost applications, the users now have the option of getting all the benefits from a threaded rod system where the modular bit is removable.
  • the cost of the improved product will be the same as the standard tapered bit system in the market.
  • threaded button bits users will have the same function with more benefits and greater savings.
  • Figure 2 is a rear plan view of the drill bit of Figure 1 ;
  • Figure 3 is a section view of the drill bit of Figure 1 connected to the end of a drill rod;
  • Figure 5 is a rear perspective view of the drill bit of Figure 1 ;
  • Figure 6 is a front perspective view of a drill rod adaptor for a modular drilling system in accordance with the invention;
  • Figure 7 is a front plan view of the drill rod adaptor of Figure 6;
  • Figure 8 is a section view showing drill bit of Figure 1 and the drill rod adaptor of Figure 7 connected to a threaded drill rod;
  • the drill bit 10 comprises a generally cylindrical body extending in a longitudinal direction between a forward end and an opposing rear end.
  • the forward end defines a bit face locating a plurality of carbide buttons 20 protruding therefrom such that the buttons are spaced apart in a circumferential direction and in a radial direction relative to a longitudinal axis of the cylindrical body of the drill bit.
  • the plurality of drill bits 10 within the modular system typically have different size bit faces for drilling different size holes in the rock.
  • the plurality of drill bits 10 forming a set of bits within the modular drilling system have female tapered connecting portions which are identical in size and configuration to one another for being commonly received on a common configuration of tapefed male connecting portion 22 or 34.
  • the plurality of planar sections 14 are arranged at uniformly spaced intervals about the circumference of the tapered female connecting portion 12 such that the three planar sections 14 are oriented about the circumference of the female connecting portion 12 at 120° intervals.
  • Each planar section 14 extends substantially the full length of the tapered female connecting portion 12.
  • the modular drilling system preferably further comprises a drill rod 18 having a tapered male connecting portion 22 for connecting the drill rod 18 to a drill bit 10 (see Figure 3).
  • the male connecting portion 22 is typically in the form of a conical boss which is adapted to be received in the female connecting portion 12 of a drill bit 10.
  • the male connecting portion 22 has three planar section 24 adapted to provide positive engagement with a planar section 14 on the female connecting portion 12 of a modular drill bit.
  • the male connecting portion 22 on the drill rod 18 has a corresponding number of planar sections 24 arranged at uniformly spaced intervals about its circumference.
  • the positive engagement of the matching planar sections at the taper connection ensures that a cyclical load is more uniformly distributed at the taper connection.
  • the planar sections can be at a different or same angle than the conical surface.
  • the conventional drill rod is a threaded drill rod 38 and the female connection portion 36 of the drill rod adaptor 30 is formed with the internal thread adapted to engage in screw-threaded engagement with the male connecting portion 40 of a threaded drill rod 38.
  • the provision of the drill rod adaptor 30 means that the modular drill bits 10 can be used with a conventional drill rod, simply by connecting a drill rod adaptor 30 to the end of the drill rod 38.
  • the drill bit 10 can be readily swapped over with another modular drill bit 10 of a different size or less worn, without the problems associated with the prior art threaded drill bits.
  • Rope R -Range
  • square threads Fl and T - Range
  • the positive engagement of the modular bits means that the head size of the modular bit can be increased due to cyclical forces being distributed more uniformly at the taper connection and connecting faces.
  • the modular bits can be adapted to any current prior art drilling system without modification.
  • the modular drill bit can be changed for a larger or smaller head sizes and still use the same modular adaptor.
  • the modular system can be used in DTH (Down the hole hammer) applications as well with similar advantages.
  • the drill rod adaptor can be provided with a different kind of female connecting portion at the rear end for connection to other types of conventional drill rod. Therefore, it will be appreciated that the scope of the invention is not limited to the specific embod iments described .

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)

Abstract

Cette invention concerne un système de forage modulaire comprenant une pluralité de trépans de tailles différentes qui peuvent être montés de manière interchangeable sur une partie de raccordement mâle commune de forme tronconique d'un ensemble tige de forage. La partie de raccordement mâle tronconique peut être formée directement sur une tige de forage tronconique de l'ensemble, ou bien sur un adaptateur vissé sur une tige de forage filetée de l'ensemble. Chaque trépan comprend une partie de raccordement femelle dotée d'une surface tronconique généralement cylindrique conforme à une surface tronconique correspondante de la partie de raccordement mâle, et d'au moins trois sections planes conçues pour un contact direct avec des sections planes correspondantes de la partie de raccordement mâle.
PCT/AU2011/000883 2010-07-14 2011-07-13 Système de forage modulaire WO2012006671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2010903133 2010-07-14
AU2010903133A AU2010903133A0 (en) 2010-07-14 Modular Drilling System

Publications (1)

Publication Number Publication Date
WO2012006671A1 true WO2012006671A1 (fr) 2012-01-19

Family

ID=45468807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2011/000883 WO2012006671A1 (fr) 2010-07-14 2011-07-13 Système de forage modulaire

Country Status (2)

Country Link
US (1) US20120125691A1 (fr)
WO (1) WO2012006671A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3751092A1 (fr) * 2019-06-14 2020-12-16 Sandvik Mining and Construction Tools AB Adaptateur de guidage

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015102891A1 (fr) * 2013-12-31 2015-07-09 Smith International, Inc. Procédé de fabrication de corps à pièces multiples de trépan hybride
GB2555299B (en) 2015-07-08 2019-09-11 Halliburton Energy Services Inc Downhole mechanical percussive hammer drill assembly
US11053743B2 (en) * 2019-07-19 2021-07-06 Seed Technologies Corp., Ltd. Polycrystalline diamond compact drill bit and oil well drilling apparatus having the same
CN116457549A (zh) * 2020-07-15 2023-07-18 创新矿业产品(控股)有限公司 用于自钻式岩栓的摩擦配合钻头组件

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2180120A (en) * 1937-12-04 1939-11-14 Saltzer Louis Drill bit and shank
GB521510A (en) * 1938-11-17 1940-05-23 Percill Liddicoat Removable bits for percussive drills
CA399899A (fr) * 1941-10-14 Alfred Morgan George Adaptateur de fleuret de perforatrice a percussion
GB646872A (en) * 1947-07-12 1950-11-29 Timken Roller Bearing Co Improvements in or relating to rotary percussion drills and processes of making the same
US2819880A (en) * 1955-10-03 1958-01-14 John E Gilchrist Rock drills

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA399899A (fr) * 1941-10-14 Alfred Morgan George Adaptateur de fleuret de perforatrice a percussion
US2180120A (en) * 1937-12-04 1939-11-14 Saltzer Louis Drill bit and shank
GB521510A (en) * 1938-11-17 1940-05-23 Percill Liddicoat Removable bits for percussive drills
GB646872A (en) * 1947-07-12 1950-11-29 Timken Roller Bearing Co Improvements in or relating to rotary percussion drills and processes of making the same
US2819880A (en) * 1955-10-03 1958-01-14 John E Gilchrist Rock drills

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3751092A1 (fr) * 2019-06-14 2020-12-16 Sandvik Mining and Construction Tools AB Adaptateur de guidage
WO2020249611A1 (fr) * 2019-06-14 2020-12-17 Sandvik Mining And Construction Tools Ab Adaptateur de guidage

Also Published As

Publication number Publication date
US20120125691A1 (en) 2012-05-24

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