WO2013121304A2 - Perfectionnements apportés à un trépan annulaire de marteau - Google Patents

Perfectionnements apportés à un trépan annulaire de marteau Download PDF

Info

Publication number
WO2013121304A2
WO2013121304A2 PCT/IB2013/001184 IB2013001184W WO2013121304A2 WO 2013121304 A2 WO2013121304 A2 WO 2013121304A2 IB 2013001184 W IB2013001184 W IB 2013001184W WO 2013121304 A2 WO2013121304 A2 WO 2013121304A2
Authority
WO
WIPO (PCT)
Prior art keywords
bit
retention element
shank
hammer drill
drill assembly
Prior art date
Application number
PCT/IB2013/001184
Other languages
English (en)
Other versions
WO2013121304A3 (fr
Inventor
Raymond Hill
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
Priority claimed from AU2012900209A external-priority patent/AU2012900209A0/en
Application filed by Sandvik Intellectual Property Ab filed Critical Sandvik Intellectual Property Ab
Publication of WO2013121304A2 publication Critical patent/WO2013121304A2/fr
Publication of WO2013121304A3 publication Critical patent/WO2013121304A3/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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives
    • 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
    • E21B10/36—Percussion drill bits
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids

Definitions

  • the present invention relates a down-the-hole hammer drill.
  • This invention has particular application to a reverse-circulation (RC) down-hole face sampling hammer drill; whilst it is not so limited, for illustrative purposes, reference will be made to this application.
  • RC reverse-circulation
  • the invention may be said to reside in a percussive down-the-hole hammer drill assembly comprising a drill bit having an elongate shank and a head, and a bit retention element disposed around the shank of the bit and comprising one or more channels for the passage of fluid along the bit.
  • the bit comprises at least one channel extending lengthwise along the shank toward the head thereof, and where for each bit channel the bit retention element comprises an aligned and opposing (or facing) channel.
  • bit and bit retention element each comprise means operatively associated to maintain retention of the bit by the bit retention element.
  • the bit retention element comprises means for maintaining alignment of the respective channels of the bit and bit retention element.
  • bit comprises means for maintaining alignment of the respective channels of the bit and bit retention element.
  • bit and bit retention element each comprise means operatively associated to maintain alignment of the respective channels of the bit and bit retention element.
  • the hammer drill assembly further comprises a drive sub comprising means for maintaining alignment of the respective channels of the bit and bit retention element.
  • bit and the drive sub each comprise means operatively associated to maintain alignment of the respective channels of the bit and bit retention element.
  • the bit shank has a circular cross-section shape and the bit retention element is shaped like a ring.
  • the hammer is a reverse-circulation (RC) down-hole face sampling one.
  • RC reverse-circulation
  • the invention may be said to reside in a percussive down-the-hole hammer drill assembly comprising a drill bit having an elongate shank and a head, and a bit retention ring disposed around the shank of the bit and comprising one or more channels defined in an inner diameter, annulus thereof for the passage of fluid along the bit.
  • the invention may be said to reside in a bit retention element for retaining a bit for a percussive down-the-hole hammer, the bit having an elongate shank and a head, wherein the bit retention element is adapted to be disposed around the shank of the bit and comprises one or more channels for the passage of fluid along the bit.
  • the bit comprises at least one channel extending lengthwise along the shank toward the head thereof, and for each bit channel the bit retention element comprises an aligned and opposing channel.
  • bit retention element further comprises means for maintaining alignment of the respective channels of the bit and bit retention element.
  • the bit retention element is shaped like a ring, and the or each of the channels thereof is defined in an inner diameter annulus thereof.
  • the invention may be said to reside in a reverse-circulation (RC) down-hole face sampling hammer drill assembly comprising a bit having an elongate shank, a head, and at least one channel extending lengthwise along the shank toward the head thereof, the assembly further comprising a bit retention element disposed around the shank of the bit, and where for each bit channel the bit retention element comprises an aligned and opposing channel for the passage of fluid along the bit.
  • RC reverse-circulation
  • Figures 1 through 3 are perspective views of an assembly comprising a drill bit, drive sub and bit retaining ring;
  • Figures 4 through 6 illustrate the drill bit and bit retaining ring without the drive sub, which has been removed to permit visibility of the remaining components
  • Figure 7 is an end view of the assembly illustrated in Figures 1 through 3, taken from the end distal the head of the bit;
  • Figure 8 is a cross-sectional view taken through the shank of the bit;
  • Figures 9 and 10 are perspective views of the bit retaining ring in isolation.
  • Figure 1 1 is a side view of the drive sub.
  • a down-the-hole hammer having a reverse circulation system comprising a cylindrical case (not illustrated), and a drive sub 10 threadably mounted in the case.
  • a piston (not illustrated) will be vertically reciprocally mounted in the case to be reciprocated by pressurised air.
  • a drill bit 20 is mounted in the drive sub 10 beneath the piston by bit retention means in the form of a bit retaining ring (or bit ring) 60.
  • the drive sub 10 comprises an annular sleeve 12 with an array of spaced apart, inwardly directed driving splines 14.
  • the drill bit 20 comprises a shank 22 and a drill bit head 23 with a bit face 23a.
  • the shank 22 has a number of outwardly directed driven splines 24, which are so spaced and numbered as to form, with the driving splines 14, pairs of splines having abutting working faces when the shank 22 of the drill bit 20 is inserted into the drive sub 10 (see Figure 2).
  • the driving splines 14 act against the driven splines 24 to drive rotation of the drill bit 20 while permitting the drill bit 20 to move longitudinally (under the effect of the hammer), with respect to the drive sub 10.
  • the drill bit 20 further comprises a bore 30 which extends lengthwise through the shank 22 to sludge holes 32 extending from the bore 30 to the bit face 23a.
  • the diameter of the bore 30 is sized so as to be sufficiently large enough to convey the largest of the cuttings produced and blown from the bit face 23a to the bore 30 via the sludge holes 32.
  • a plurality of channels 40 extend lengthwise along the shank 22 of the bit 20 toward the head 23 so as to direct exhaust air from the hammer motor to the bit head 23. This air blows the bit face 23a clear of cuttings, and carries a mist of lubricant to the driving splines 14 and driven splines 24.
  • the reverse circulation system involves the downward circulation of a flushing medium, such as via the channels 40 to the cutting face 23a of the bit, whereupon the air flows laterally across the cutting face 23a and eventually up through the bore 30 in the bit and the hammer to the ground level. Cuttings become entrained within the air as the air passes across the cutting face 23a of the bit 20 and are conducted to the surface along with the air for analysis.
  • external bit splines comprise outwardly extending annular radial shoulders 50 which form retention lugs configured to rest on the bit ring 60 so as to limit the travel of the bit 20 and retain this in the drive sub 10.
  • Adoption of a bit 20 design in which the root diameter of the splines 24 is maximised to increase the strength of the bit 20 would exacerbate the flow restriction beneath bit rings of hammer drills of the prior art, adversely affecting the performance of the hammer.
  • the primary function of the bit retaining ring 60 is to retain the bit 20 within the drive sub 10 when the components are assembled, the features achieving this must be robust, because if the bit 20 becomes wedged in the bottom of a hole, high tensile loads (in excess of 40 tonne) may be applied during the extrication process.
  • bit rings 60 and shank retaining lugs 50 In addition to the shear loads that may be applied to the bit ring 60 and shank retaining lugs 50, it is necessary that these features be able to withstand high cyclic impact loads, such as those produced when drilling soft ground using high air pressures, thereby causing significant reaching of the bit 20. This situation also arises when drilling through stopes and voids and the like, and also when lifting off bottom and engaging 'flushing' mode. These conditions are all frequently encountered during normal drilling operations. In order to address this requirement the bit rings 60 and retaining lugs 50 require relatively high surface hardness in order to prevent unacceptable deformation, as well as requiring a tough core to counter the associated brittleness of such a surface.
  • each bit ring channel 62 is a curved recess, circle segment (or scallop) formed into the inner edge of the annular bit ring 60.
  • These bit ring channels 62 improve air flow past the bit ring 60, thereby improving the efficiency of the hammer. It will be apparent however that these bit ring channels 62 may be of other shapes.
  • This approach enables full contact to be made between the matching faces of the retention lugs 50 and the bit ring 60, thereby minimising the contact pressures generated when over reaching, whilst maximising the venting of the hammer exhaust air through the assembly.
  • bit ring 50 is significantly scalloped relative to the fine profile used on the driven splines 24
  • the bit 20 be rotated in the reverse direction the driving and driven splines 14 and 24 should remain adjacent and in close proximity to each other.
  • this ensures that the bit ring channels 62 remain misaligned with respect to the retaining lugs 50 (so as to prevent the bit 20 from dropping out of the drive sub 10), and ensure that each bit ring channel 62 remains aligned with its respective bit channel 40 (see Figures 7 and 8).
  • the bit ring 60 is keyed to the drive sub 10 by diametrically opposed alignment lugs 64 extending from the bit ring 60 into slots 70 of matching shape in the drive sub 10.
  • this arrangement may be reversed, or the bit ring 60 may be keyed to the drill bit 20 using a similar arrangement of keyed slot(s) and retaining lug(s).
  • it is desirable that the splines 14 and 24 are designed so that excessive backlash is prevented should reverse rotation be applied to the drill string and hammer, thereby ensuring that the bit ring channels (or scallops) 62 remain misaligned with respect to the bit retaining lugs 50.

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

La présente invention se rapporte à un ensemble marteau-perforateur de fond de trou, et s'applique en particulier à un ensemble marteau-perforateur d'échantillonnage de face de fond de trou à circulation inversée (RC). Plus particulièrement le marteau comprend un trépan ayant une tige allongée et une tête, et un élément de retenue de trépan disposé autour de la tige du trépan et comprenant un ou plusieurs canaux pour le passage de fluide le long du trépan.
PCT/IB2013/001184 2012-01-19 2013-01-17 Perfectionnements apportés à un trépan annulaire de marteau WO2013121304A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2012900209 2012-01-19
AU2012900209A AU2012900209A0 (en) 2012-01-19 Hammer bit ring improvements

Publications (2)

Publication Number Publication Date
WO2013121304A2 true WO2013121304A2 (fr) 2013-08-22
WO2013121304A3 WO2013121304A3 (fr) 2014-10-23

Family

ID=48832955

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/001184 WO2013121304A2 (fr) 2012-01-19 2013-01-17 Perfectionnements apportés à un trépan annulaire de marteau

Country Status (1)

Country Link
WO (1) WO2013121304A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3146140A4 (fr) * 2014-05-23 2017-05-17 Ignis Technologies Pty Ltd. Système de retenue de trépan

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991016521A1 (fr) * 1990-04-19 1991-10-31 Werner Giehl Agencement de forage a percussion
AUPR879901A0 (en) * 2001-11-13 2001-12-06 Sds Digger Tools Pty Ltd An improved transmission sleeve
US7117939B1 (en) * 2002-11-20 2006-10-10 Gregory Dee Hawley Percussion hammer bit retainer apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3146140A4 (fr) * 2014-05-23 2017-05-17 Ignis Technologies Pty Ltd. Système de retenue de trépan

Also Published As

Publication number Publication date
WO2013121304A3 (fr) 2014-10-23

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