EP2004947A1 - Marteau-piqueur, ensemble meche de percussion et procede d'agrandissement d'un trou - Google Patents

Marteau-piqueur, ensemble meche de percussion et procede d'agrandissement d'un trou

Info

Publication number
EP2004947A1
EP2004947A1 EP07709319A EP07709319A EP2004947A1 EP 2004947 A1 EP2004947 A1 EP 2004947A1 EP 07709319 A EP07709319 A EP 07709319A EP 07709319 A EP07709319 A EP 07709319A EP 2004947 A1 EP2004947 A1 EP 2004947A1
Authority
EP
European Patent Office
Prior art keywords
pilot
bit
set forth
hole
percussion
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Withdrawn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
EP07709319A
Other languages
German (de)
English (en)
Inventor
Rob A. Simmons
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.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
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 Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Publication of EP2004947A1 publication Critical patent/EP2004947A1/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Withdrawn legal-status Critical Current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
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
    • 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
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring

Definitions

  • the present invention relates to a down-the-hole hammer with a pilot and a method of enlarging a hole. .
  • a percussion bit 1 having a pilot portion 2 as seen in FIG. 6 can be used together with a piston and casing of a percussion hammer (not shown).
  • the percussion bit 1 and pilot 2 are manufactured as a single unit from a solid bar.
  • the pilot 2 is received in a preexisting hole and guides the bit 1 relative to the hole so that, within limits largely depending upon the clearance between the pilot and the walls of the preexisting hole, the enlarged hole will be substantially coaxial with the preexisting hole.
  • Flushing medium such as compressed air, water, or slurry, is introduced to the face of the bit 3 of the percussion bit 1 through an axial passage 4 through the shank 5 of the percussion bit, and through substantially radial passages 6 near the face of the bit.
  • the flushing medium flows out of the radial passages 6 and then returns through recesses 7 provided in the bit 3 and between the walls of the enlarged hole and the casing (not shown) of the hammer.
  • a down-the-hole hammer includes a piston movably disposed in a casing and a percussion bit at an end of the casing, the percussion bit comprising an integral bit and shank and a pilot removably fastened at a torward end ot ttie bit.
  • a percussion bit assembly comprises an integral bit and shank and a pilot removably fastened at a forward end of the bit.
  • a method of enlarging a preexisting hole is provided. According to the method, a down-the-hole hammer having a percussion bit comprising an integral bit and shank and a pilot removably fastened at a forward end of the bit is positioned relative to the preexisting hole such that the pilot is disposed in the preexisting hole. The down-the-hole hammer is operated such that the bit of the percussion bit forms an enlarged hole while the pilot steers the bit relative to the preexisting hole.
  • FIG. 1 is a partially cross-sectional view of a down-the-hole hammer enlarging a preexisting hole according to an embodiment of the present invention
  • FIG.2A is a cross-sectional view of part of and FIG.2B is an end view of a percussion bit with a pilot according to an embodiment of the present invention
  • FIG.3 A is a partially cross-sectional view of a percussion bit with a pilot according to an embodiment of the present invention
  • FIG.3B is a partially cross-sectional, exploded view of the percussion bit with a pilot of FIG.3 A
  • FIG.4 is a cross-sectional view of part of a percussion bit with a pilot according to another embodiment of the present invention
  • FIG.5 is a cross-sectional view of part of a percussion bit with a pilot according to another embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of a percussion bit according to the prior art.
  • FIG. 1 A down-the-hole hammer 21 according to an embodiment of the present invention is shown in FIG. 1.
  • the hammer 21 is adapted to enlarge a preexisting hole 23, thereby forming an enlarged hole 25.
  • the hammer 21 can be, in most respects, a conventional hammer of the type comprising a piston 27 movably disposed in a cylinder or casing 29.
  • a conventional hammer of the type comprising a piston 27 movably disposed in a cylinder or casing 29.
  • Illustrative of such hammers are the Driltech Mission DTH (down-the-hole) hammers available from the Driltech Mission group of Sandvik Mining and Construction, 1300 Heritage Pkwy, Mansfield, TX 76063.
  • the hammer 21 further comprises a percussion bit 31 at an end 33 of the casing 29.
  • the percussion bit 31 is of a conventional type comprising an integral bit 35 and shank 37.
  • the percussion bit 31 further comprises a pilot 39 removably fastened at a forward end 41 of the bit 35.
  • the pilot 39 can include a male threaded portion 43 and the percussion bit 31 can include a female threaded portion 45 with which the male threaded portion is adapted to mate to removably fasten the pilot at the forward end 41 of the bit 35.
  • the pilot 39a can include a female threaded portion 43a and the percussion bit 31a can include a female threaded portion 45a with which the male threaded portion is adapted to mate to removably fasten the pilot at the forward end 41 of the bit 35.
  • threaded connections need not be as illustrated in FIGS.2A, 3A-3B, or 4.
  • embodiments including male threaded portions 43 on the pilot 39 and female threaded portions 45 on the percussion bit 31 will be discussed, it being understood that the discussion is equally applicable to embodiments with female threaded portions on the pilot and male threaded portions on the percussion bit, except where otherwise indicated.
  • the pilot 39 may be made of a material that is lighter and/or less expensive than the material from which the percussion bit 31 is made.
  • the percussion bit 31 will often be made of a high quality alloy steel
  • the pilot 39 may be made of a commercial grade carbon steel such as l018 or l050, which will ordinarily be less expensive than the alloy.
  • the pilot 39 can have a portion that has less mass per unit volume than another portion.
  • the pilot 39 can include a hollow portion, such as by forming a recess 47 in the forward end 49 of the pilot.
  • Other possible arrangements include, instead of providing a hollow portion, providing interior material of the pilot that is less dense than exterior material, or providing recesses or through-holes in the pilot.
  • the combination of the percussion bit 31 with the pilot 39 may have a lower mass and use less material relative to similar structures formed from a single steel bar. Further, manufacturing of the percussion bit 31 separately from the pilot 39 can be simpler than manufacturing of a percussion bit formed with a pilot from a solid steel bar.
  • the pilot 39 can include at least one flushing medium hole 51 extending at an angle to a longitudinal axis of the pilot.
  • a plurality of flushing medium holes 51 are provided, such as is shown in tiU. 2 ⁇ where tour Hustling medium noies are provi ⁇ e ⁇ .
  • i ne imsning medium can be compressed air or any other suitable medium.
  • the flushing medium passes forwardly to the front end of the bit 35, substantially radially through the flushing medium holes 51 , and rearwardly through recesses 53 provided in the bit and between the casing 29 and walls 55 of the enlarged hole 25.
  • a pin assembly 57 can be disposed in an opening 59 in the percussion bit 31 for removably fastening the pilot 39 relative to the percussion bit.
  • the pin assembly 57 can be an additional means of removably fastening the pilot 39 to the percussion bit
  • the pin assembly 57 can include one or more ball bearings 61 adapted to pass through the opening 59 in the percussion bit 31 and adapted to be received in a channel 63 formed by aligned grooves 65 and 67 in the percussion bit and the pilot 39, respectively.
  • a pin 69 can be positioned in the opening 59 in the percussion bit 31 and the opening in the percussion bit can be capped with a wear button 71, such as a cemented carbide wear button.
  • shock absorbing arrangement for absorbing shocks that might be transmitted to from the percussion bit 31 to the pilot 39 can be provided.
  • the shock absorbing arrangement may comprise any suitable arrangement, such as a resilient member 83
  • a spring or a rubber spacer between facing portions of the percussion bit 31 and the pilot 39, such as between a top end 85 of the pilot 39 and a facing bottom end 87 of the percussion bit
  • the shock absorbing arrangement may be used with the pin assembly 57, with the threaded connection 43, 45, or with the pin assembly together with the threaded connection.
  • the opening 59 may be internally threaded and the pin 69 and/or the wear button 71 may
  • the bit 35 typically comprises a plurality of rock cutting members 73 disposed thereon.
  • the pilot 39 will ordinarily have no rock cutting members and will function entirely as a guide for the bit 35, however, the pilot may be provided with rock cutting members, such as may be desirable if obstructions in the preexisting hole are likely to be encountered.
  • a threaded connection may be omitted entirely and a percussion bit 131 can include a pilot 139 secured relative to an integral bit 135 and shank 137 by a structure such as a pin assembly 157 that can be the same as the pin assembly 57.
  • a resilient member such as a urethane spacer 183 can be provided between facing surfaces of the pilot 139 and the integral bit 135 and shank 137.
  • the down-the-hole hammer 21 is positioned relative to the preexisting hole such that the pilot 39 is disposed in the preexisting hole.
  • the down-the-hole hammer 21 is operated such that the bit 35 of the percussion bit 31 forms the enlarged hole 25 while the pilot 39 steers the bit relative to the preexisting hole.
  • the enlarged hole 25 can have substantially the same axis as the preexisting
  • the pilot will guide the cutting by the bit 35 generally along the axis of the
  • a packing part 75 (shown in phantom in FIG.2A) may be provided on the pilot in the space between the pilot and walls 77 of the preexisting hole.
  • the packing part 75 may, for example, be a flexible rubber skirt member such as is disclosed in WO 95/22677, which is incorporated by reference.
  • the packing part 75 may be useful, for example, to assist in guiding the bit 35 as an extension of the pilot 39, and/or as a means of preventing flushing medium from flowing down the preexisting hole 23 instead of back between the casing 29 and the walls 55 of the enlarged hole 25.
  • Flushing medium such as air, water, or a slurry will ordinarily be directed forward through an interior passage 79 through the percussion bit 31 to the forward end 41 of the bit 35 and rearwardly through the enlarged hole 25.
  • An interior passage 81 leading to the openings 51 may also be provided in the pilot 39.
  • the interior passage 81 can facilitate reducing the mass of the pilot 39 which can facilitate improving the amount of piston energy that is transferred through the face of the bit 35 instead of being absorbed by the pilot.
  • the flushing medium will ordinarily be directed to the forward end 41 of the bit 35 through at least one opening 51 in the pilot 39. Holes for introducing flushing medium may be provided in the percussion bit 31 above the pilot 39, however, it is anticipated that introducing the flushing medium at a point below the face of the bit 35 will facilitate clearing debris from the bit face. Ordinarily, the bit 35 (and rock cutting members 73 thereon) will perform all the cutting action for enlarging the preexisting hole 23. However, it will be appreciated that the pilot 39 can include some rock cutting members (not shown), particularly to facilitate clearing debris in the preexisting hole.

Landscapes

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

Abstract

L'invention concerne un marteau-piqueur comprenant un piston (27) disposé de manière mobile dans un boîtier (29) et une mèche de percussion (31) située à une extrémité du boîtier (29). La mèche de percussion (31) comprend une mèche (35) intégrale avec une queue (37) et un pilote (39) fixé de manière amovible à une extrémité avant de la mèche (31). L'invention concerne également un ensemble mèche de percussion comportant une mèche (35) intégrale, une queue (37) et un pilote (39) amovible situés à une extrémité avant de la mèche (31). Elle concerne également un procédé d'agrandissement d'un trou préexistant.
EP07709319A 2006-03-30 2007-02-06 Marteau-piqueur, ensemble meche de percussion et procede d'agrandissement d'un trou Withdrawn EP2004947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28701306A 2006-03-30 2006-03-30
PCT/SE2007/000103 WO2007114749A1 (fr) 2006-03-30 2007-02-06 Marteau-piqueur, ensemble meche de percussion et procede d'agrandissement d'un trou

Publications (1)

Publication Number Publication Date
EP2004947A1 true EP2004947A1 (fr) 2008-12-24

Family

ID=38563931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07709319A Withdrawn EP2004947A1 (fr) 2006-03-30 2007-02-06 Marteau-piqueur, ensemble meche de percussion et procede d'agrandissement d'un trou

Country Status (5)

Country Link
EP (1) EP2004947A1 (fr)
AU (1) AU2007232500B2 (fr)
CA (1) CA2645897A1 (fr)
WO (1) WO2007114749A1 (fr)
ZA (1) ZA200807765B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO335329B1 (no) 2013-02-20 2014-11-17 Shellcon As Borekrone med faste kutterelementer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884227A (en) * 1956-06-27 1959-04-28 Sandvikens Jernverks Ab Percussion drill bit for large holes
US3145789A (en) * 1962-03-20 1964-08-25 Russell H Lawry Pilot rock drill
US3469641A (en) * 1967-12-11 1969-09-30 Cominco Ltd Reaming bit assembly
US3870114A (en) * 1973-07-23 1975-03-11 Stabilator Ab Drilling apparatus especially for ground drilling
DE2807156C2 (de) * 1978-02-20 1986-11-20 Gebrüder Heller Verwaltungsgesellschaft mbH, 2807 Achim Gesteinsbohrwerkzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007114749A1 *

Also Published As

Publication number Publication date
AU2007232500B2 (en) 2010-06-03
AU2007232500A1 (en) 2007-10-11
CA2645897A1 (fr) 2007-10-11
ZA200807765B (en) 2010-08-25
WO2007114749A1 (fr) 2007-10-11

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