EP1627130B1 - Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage - Google Patents

Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage Download PDF

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Publication number
EP1627130B1
EP1627130B1 EP04741645A EP04741645A EP1627130B1 EP 1627130 B1 EP1627130 B1 EP 1627130B1 EP 04741645 A EP04741645 A EP 04741645A EP 04741645 A EP04741645 A EP 04741645A EP 1627130 B1 EP1627130 B1 EP 1627130B1
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EP
European Patent Office
Prior art keywords
drill bit
cutters
shear
axial
shear cutters
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EP04741645A
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German (de)
English (en)
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EP1627130A1 (fr
Inventor
Antonio Maria Guimaraes Leite Cruz
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Definitions

  • the present invention relates to a percussion drill bit for drilling into a subterranean earth formation, the drill bit having a central longitudinal axis and being operable by applying axial percussive motion along the axis and rotary motion about the axis.
  • the invention further relates to a drilling system for drilling a borehole in an earth formation, comprising a drill string provided with such a percussion drill bit, and to a method of drilling a bore hole into a subterranean earth formation.
  • the invention also relates to a method of drilling a bore hole into a subterranean earth formation.
  • a percussive shearing drill bit is known and described in US patent 6,253,864.
  • Figure 4 of said US patent depicts a percussive shearing bit having a unitary body, a means for attachment to a drill string, and a plurality of blades housing a plurality of shear cutting elements. Fluid outlets are situated on the head of the unitary body between the blades.
  • the blades consist of a series of receptacles to house the shear cutting elements and a shelf that runs along each blade before the cutting elements. The shelf serves to direct cuttings away from the operative surface of the bit.
  • the known percussive shearing drill bit is rotated about its longitudinal axis shearing off the rock formation as the drill bit rotates.
  • a hammer simultaneously impacts the bit thereby providing an additional percussive drilling force.
  • the shear cutting elements have been specially designed to withstand the unusual stresses induced by combined percussive/shear drilling, in that a distal portion of the shear cutter has been rounded to prevent large localised stresses in the cutters.
  • a percussion drill bit for drilling into a subterranean earth formation, the drill bit having a central longitudinal axis and being operable by applying axial percussive motion along the axis and rotary motion about the axis, the drill bit comprising:
  • the drill bit according to the invention comprises axial cutters in addition to the shear cutters.
  • the primary function of the axial cutters is to receive the percussive impacts between the drill bit and the earth formation, whereas the primary function of the shear cutters is to scrape off cutting debris from the bottom of the bore hole.
  • the axial cutters can be optimised for axial cutting action, whereas the shearing cutters can independently be optimised for shear cutting without having to take into account axial cutting capability.
  • the distal portion of the shear cutters can be sharp, and remain sharp for a relatively long operational time, in order to achieve a high shearing effectivity.
  • the shear cutters can have a higher shearing effectivity than the axial cutters.
  • the axial cutters can be more resistant to axial impacts than the shear cutters.
  • the drill bit according to the invention allows for continued operation even with moderate wear on the cutting elements, without suffering from significant lower drilling rates.
  • the axial cutters are located on the same blade as the shear cutters.
  • a robust and stable percussion drill bit is achieved.
  • the axial cutters are directly followed by the next flow channel, preferably without being separated from the next flow channel by one or more shear cutters. This way, any bit balling that may start under the axial cutters of the first blade is cleaned away by the subsequent neighbouring flow channel that is associated with the row of shear cutters of the next blade.
  • the number of axial cutters in relation to the number of shear cutters can be optimal in dependence of the type of earth formation to be drilled.
  • Earth formations containing relatively hard rock, such as granite can be drilled with relatively fewer shear cutters and greater total number of cutters, thereby distributing the percussive impact over a larger number of axial cutters.
  • a softer formation, such as a lime stone or a sand stone, is best drilled using a bit having relatively many shear cutters because impact forces are lower and the chance of bit balling is higher.
  • An embodiment wherein there are more axial cutters provided than shearing cutters is preferred for drilling harder earth formations.
  • the invention also provides a drilling system for drilling a borehole in an earth formation, comprising a drill string provided with a percussion drill bit as described above, the drilling system further comprising:
  • one or more of the shear cutters is provided with a pre-cut flat impact surface essentially parallel to the plane perpendicular to the longitudinal axis. Even though there are provided axial cutters for taking the axial percussive force, it cannot be avoided that the shear cutters take part of the impact. Due to the pre-cut flat impact surface, the impact stress concentration on the shear cutters is reduced and as a result they do not break as soon as shear cutters that do not have a pre-cut flat impact surface. A natural wear flat has been found not to be sufficiently flat to effectively reduce the impact stress concentration.
  • the drill bit or drilling system provided with shear cutters having the pre-cut flat impact surface has been found to cause fewer stick-slip torsional vibration modes in the drilling system, whereby the bit is hammered to a standstill into the earth formation while the drill string is twisted by the surface rotary drive until it abruptly releases with relatively high rotational speed.
  • Such a stick-slip torsional vibration repeats periodically and the high rotational speed associated with the stick-slip torsional vibration can severly damage the cutters on the drill bit.
  • the method of the invention comprises the steps of providing a drilling system in accordance with one of the above defined embodiments, placing the drill bit against the subterranean earth formation that is to be drilled, exercising a rotary motion about the axis while maintaining a force on the drill bit against the earth formation in the axial direction, and intermittingly providing percussive strikes on the drill bit.
  • FIG. 1a A perspective view of a 3-blade percussion drill bit in accordance with the invention is shown in FIG. 1a.
  • the drill bit comprises a shank 1 stretching longitudinally about a central longitudinal axis of the drill bit, which shank can be especially adapted to fit inside a drill string.
  • the rearward end of the shank is connected to a striking surface 2 to receive impacts from a percussive hammer, preferably a reciprocative piston hammer (not shown).
  • the forward end of the shank is connected to a drilling head 3.
  • the shank 1 is provided with a plurality of splines 4, running essentially longitudinally along the shank 1.
  • the splines 4 serve to rotationally couple the drill string and the shank 1, so that the drill bit is operable by applying both axial percussive motion and rotary motion about the central longitudinal axis.
  • the drilling head 3 is provided with three blades 61, 62, and 63 that protrude from the drill bit.
  • the areas between the blades 61, 62, 63 are recessed with respect to the blades and thus form flow channels 71, 72, 73.
  • the flow channels 71, 72, 73 essentially run radially along the drilling head 3.
  • a central passage way 8 is provided in the drilling head 3 for passing of flushing fluid.
  • passage ways 81, 82, 83 can be provided in the flow channels 71, 72, 73 between the blades 61, 62, 63.
  • the passage ways are all connected to a central longitudinal bore (not shown) running through the shank 1.
  • FIGs. 1a and 1b depict the direction of rotary motion that, in operation, is applied to the drill bit.
  • the blades 61, 62, 63 thus each have a leading edge 91, 92, 93, with respect to the direction of rotary motion 5.
  • Shear cutters 9 are provided in a row on the leading edge 91, 92, 93 of each respective blade 61, 62, 63.
  • Each row of shear cutters 9 has a flow channel associated with it directly in front of the row of shear cutters 9 with respect to the direction of rotary motion 5.
  • the shear cutters 9 have a shape optimised for scraping along the bottom of the bore hole and thereby shearing pieces of the earth formation from the bottom of the bore hole.
  • axial cutters 10, 11 are provided on the blades 61, 62, 63.
  • the axial cutters 10, 11, have a shape optimised for axially indenting the earth formation in the bottom of the bore hole and thereby possibly crushing the earth formation.
  • the outer peripheral sections of the blades 61, 62, 63 can be provided with gauge protectors 12, preferably PDC coated.
  • FIG. 2a shows a perspective view
  • FIG. 2b a top view, of a variant of the drill bit of the invention having four blades 6 and consequently four flow channels 7.
  • this variant is similar to the one shown in FIGs. 1a and 1b.
  • the positioning of the rows of shear cutters 9 on the leading edges of the blades and the positioning of the axial cutters 10, 11 in a trailing position with respect to the rows of shear cutters 9, are similar to the first discussed embodiment.
  • the diameter of the outer periphery of the percussion drill bits discussed above in FIGs. 1a and 1b, and FIGs. 2a and 2b, is 6", corresponding to approximately 15 cm.
  • An example of an 8" (corresponding to approximately 20 cm outer diameter) bit face is depicted in FIG. 3.
  • This embodiment is based on eight blades 6 and a corresponding number of flow channels 7.
  • Each flow channel 7 is provided with a passage way 81 for allowing entry of flushing fluid into the respective flow channel. Since this bit face of FIG. 3 has a larger diameter than the ones shown in FIGs. 1 and 2, a larger number of shear cutters 9 and axial cutters 10,11 can be accommodated.
  • the shear cutters in a first said row of shear cutters are positioned at mutually different radial positions than the shear cutters in a second said row of shear cutters on another blade. This way, the gaps left between adjacent shear cutters in one row are covered by the shear cutters in a next row on a different blade when the drill bit is rotated.
  • the circular paths of the collection of shear cutters slightly overlap such that a continuous band of shear cutting is achieved over a majority of the area in the bore hole bottom surface.
  • FIG. 4 depicts a schematic representation of the cutter arrangement, as seen in a tangential cross section. Visible are a blade 6 and its leading edge 91. A shear cutter 9 is provided on or adjacent to the leading edge 91, to shear-cut the earth formation 13 and scrape off cutting debris 20 into the flow channel 71. Behind the shear cutter 9 in relation to the direction of rotary movement 5, is an axial cutter 10.
  • the shear cutter 9 has a shear cutter shank 14 made of a hard material, for which tungsten carbide is suitable.
  • the rake surface facing the associated flow channel 71, is covered with a layer 15 of polycrystalline diamond.
  • Such a shear cutter having a polycrystalline diamond cutting surface is known as a polycrystalline diamond compact cutter, or PDC cutter.
  • the shear cutter is provided with a pre-cut flat impact surface 19 stretching essentially perpendicular to the central longitudinal axis of the drill bit and essentially parallel to the bottom hole surface of the earth formation 13.
  • the axial cutter 10 is formed of an axial cutter shank 16 which at least on one side is provided with a hemispherical or dome shaped cutting surface 17.
  • the cutter is made of a hard material, for which tungsten carbide is a suitable material.
  • the cutter can be provided with a layer of polycrystalline diamond thus forming a PDC axial cutter.
  • the shear cutter 9 may be arranged recessed with respect to the axial cutters 10,11 such that the axial cutters 10,11 impact on the rock 13 in the bottom of the bore hole before the shear cutter 9 does.
  • the recessed arrangement causes the shear cutter 9 to be elevated above the rock 13 in the bottom of the bore hole, at a height corresponding to the amount of recess, when the axial cutters 10,11 just start to penetrate a fresh piece of rock 13.
  • the final penetration depth of the shear cutter 9 is less than that of the axial cutters 10,11 by an amount corresponding to the amount of recess.
  • Any amount of recess has a beneficial effect on the operational lifetime of the shear cutters, but a recessed arrangement by at least 0.25 mm is recommended, while at least 0.50 mm is preferred.
  • the outermost axial cutters 11 are PDC axial cutters and the other axial cutters 10 are tungsten carbide axial cutters.
  • the outer most axial cutters 11 are harder and/or more wear resistant than the remaining axial cutters 10.
  • the shear cutters 9 are PDC cutters.
  • FIG. 5 schematically shows the provision of the pre-cut flat impact surface 19 on these shear cutters for different pre-cutting depths of 1 mm, 2 mm and 3 mm.
  • the pre-cutting depth corresponds to the normal distance between the pre-cut impact surface 19 and the summit point 18 where the shear cutter shank outer shell and the rake surface come together.
  • the back-rake angle of each of these shear cutters is 40° as an example, but any angle smaller than 90° can be applied.
  • the pre-cut flat impact surface area increases as the pre-cutting depth increases.
  • the pre-cutting depth is between 1 and 3 mm.
  • the percussion drill bit is incorporated in a drilling system whereby the percussion drill bit is held by a drill string.
  • the drilling system further comprises:
  • the axial cutters 10,11 and the shear cutters 9 both are in contact with the earth formation 13, so that the percussive impact force is distributed over as many cutters as possible.
  • the operational lifetime of the cutters is sustained as much as possible.
  • the shear cutters are provided with a pre-cut impact surface as described above. These pre-cut impact surfaces, which can also be viewed upon as pre-cut wear flats, are also beneficial in reducing the tendency to excite so-called slip-stick torsional vibrations in the drilling system.
  • the rake surface of each shear cutter can have a secondary inclination relative to the radial direction of the drill bit, the secondary inclination being such that the rake surface pushes drill cuttings from the rock formation in radially outward or radially inward direction.
  • Typical suitable operating conditions for the drill bits described above include a weight on bit lying in a range between 3 to 6 metric tons.
  • the amount of percussive energy exercised on the drill bit per percussive blow can lie in a range of between 0.3 kJ to 5 kJ.
  • the drilling system can be operated using between 10 and 50 kW of percussive power, at a percussion frequency between 9 and 30 Hz.
  • percussion drill bits shown and described above have 6" and 8" outer diameters by way of example. It will be understood that other diameters can be applied in a similar fashion. Likewise, the invention is not limited by the number of blades shown. Any number of blades can be provided.

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  • 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 trépan à percussion servant à réaliser un forage dans une formation terrestre souterraine, lequel trépan comprend un axe longitudinal central et peut être actionné sous l'effet d'un mouvement de percussion axial appliqué le long de l'axe et d'un mouvement rotatif appliqué autour de l'axe, lequel trépan comprend : une pluralité de lames (61, 62, 63) dépassant du trépan ; une pluralité de canaux d'écoulement (71, 72, 73) s'étendant le long du trépan dans une direction sensiblement radiale, lesquels canaux d'écoulement successifs sont formés entre deux lames adjacentes ; des organes coupants de cisaillement (9) qui sont disposés en rang sur ou à proximité du bord d'attaque d'au moins une de ces lames par rapport au sens du mouvement rotatif située juste derrière le canal d'écoulement correspondant, ce qui permet au fluide de s'écouler et de ce fait d'éliminer les débris de découpe s'accumulant devant la rangée d'organes coupants de cisaillement ; et, outre ces organes coupants de cisaillement, des organes coupants axiaux (10, 11) qui sont situés, par rapport au sens du mouvement rotatif, immédiatement derrière ladite rangée d'organes coupants de cisaillement et le canal d'écoulement correspondant.

Claims (14)

  1. Trépan à percussion pour forer dans une formation terrestre souterraine, le trépan comportant un axe central longitudinal et pouvant fonctionner par application d'un mouvement de percussion axial le long de l'axe et d'un mouvement de rotation autour de l'axe, le trépan comprenant :
    - une pluralité de lames (61, 62, 63) dépassant du trépan;
    - une pluralité de canaux d'écoulement (71, 72, 73) s'étendant le long du trépan dans une direction sensiblement radiale de sorte que les canaux d'écoulement successifs soient formés entre deux lames adjacentes;
    - des tranchants de cisaillement (9), qui sont aménagés en ligne sur ou près du bord d'attaque (91, 92, 93) d'au moins une desdites lames par rapport au sens du mouvement de rotation (5) en position arrière adjacente au canal d'écoulement qui lui est associé, pour permettre à un fluide de s'y écouler et d'éliminer de la sorte les débris de coupe s'accumulant devant la rangée de tranchants de cisaillement; et, en plus de ces tranchants de cisaillement; caractérisé en ce que
    - des tranchants axiaux (10, 11) sont situés, par rapport au sens du mouvement de rotation, dans une position arrière par rapport à ladite rangée de tranchants de cisaillement et de son canal d'écoulement associé.
  2. Trépan à percussion selon la revendication 1, dans lequel les tranchants axiaux sont disposés en avant du canal d'écoulement adjacent suivant par rapport au sens du mouvement de rotation.
  3. Trépan à percussion selon la revendication 2, dans lequel le canal d'écoulement adjacent suivant est associé à une seconde rangée de tranchants de cisaillement aménagée sur le bord d'attaque de la lame suivant ladite au moins une lame.
  4. Trépan à percussion selon la revendication 1, dans lequel les tranchants axiaux sont situés sur la même lame que les tranchants de cisaillement.
  5. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel les tranchants axiaux ont des surfaces de coupe en forme de dôme ou de forme sensiblement hémisphérique.
  6. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel les tranchants axiaux sont formés essentiellement de carbure de tungstène.
  7. Trépan à percussion selon la revendication 6, dans lequel les tranchants axiaux sont pourvus d'une couche externe de carbone polycristallin.
  8. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel il y a plus de tranchants axiaux fournis que de tranchants de cisaillement.
  9. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel le rapport entre le nombre de tranchants axiaux et le nombre de tranchants de cisaillement fournis est d'au moins 3:2.
  10. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel les tranchants de cisaillement de ladite première rangée de tranchants de cisaillement sont disposés dans des positions radiales mutuellement différentes de celles des tranchants de cisaillement d'une seconde dite rangée de tranchants de cisaillement d'une autre lame.
  11. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel les tranchants de cisaillement possèdent une surface de dépouille faisant face au canal d'écoulement qui lui est associé sous un angle de dépouille arrière inférieur à 90°, l'angle de dépouille arrière étant défini comme l'angle compris entre la projection d'une ligne perpendiculaire à ladite surface de dépouille sur un plan, défini par ledit axe central longitudinal du trépan et la direction tangentielle du mouvement de rotation, et un plan perpendiculaire audit axe longitudinal.
  12. Trépan à percussion selon l'une quelconque des revendications précédentes, dans lequel un ou plusieurs tranchants de cisaillement est ou sont pourvus d'une surface d'impact plate prédécoupée essentiellement parallèle au plan perpendiculaire à l'axe central longitudinal.
  13. Système de forage pour forer un trou dans une formation terrestre, comprenant un train de forage pourvu d'un trépan à percussion selon l'une quelconque des revendications précédentes, le système de forage comprenant en outre :
    - un premier moyen d'entraînement pour faire tourner le trépan dans le trou de forage afin d'induire un mouvement de raclage des tranchants de cisaillement le long du fond du trou de forage; et
    - un second moyen d'entraînement pour induire un mouvement longitudinal réciproque du trépan dans le trou de forage afin d'induire au moins les tranchants axiaux à exercer une force de percussion au fond du trou de forage.
  14. Procédé de forage d'un trou dans une formation terrestre souterraine, comprenant les étapes consistant à fournir un système de forage selon la revendication 13, à placer le trépan contre la formation terrestre souterraine qui doit être forée, à exercer un mouvement de rotation autour de l'axe tout en maintenant une force sur le trépan contre la formation terrestre souterraine dans la direction axiale et à fournir par intermittence des percussions sur le trépan.
EP04741645A 2003-05-26 2004-05-25 Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage Active EP1627130B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04741645A EP1627130B1 (fr) 2003-05-26 2004-05-25 Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03076614 2003-05-26
EP04741645A EP1627130B1 (fr) 2003-05-26 2004-05-25 Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage
PCT/EP2004/050912 WO2004104362A1 (fr) 2003-05-26 2004-05-25 Trepan a percussion, systeme de forage comprenant ce trepan et procede de forage d'un trou de forage

Publications (2)

Publication Number Publication Date
EP1627130A1 EP1627130A1 (fr) 2006-02-22
EP1627130B1 true EP1627130B1 (fr) 2006-11-29

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Country Link
EP (1) EP1627130B1 (fr)
CN (1) CN100458097C (fr)
AR (1) AR044551A1 (fr)
AT (1) ATE347019T1 (fr)
BR (1) BRPI0410536A (fr)
CA (1) CA2526249A1 (fr)
CO (1) CO5630007A2 (fr)
DE (1) DE602004003493T2 (fr)
EG (1) EG23869A (fr)
NO (1) NO20056154L (fr)
RU (1) RU2332553C2 (fr)
WO (1) WO2004104362A1 (fr)

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AR044550A1 (es) 2003-05-26 2005-09-21 Shell Int Research Cabeza de perforacion y sistema y metodo para perforar un pozo de perforacion en una formacion de tierra
AR044485A1 (es) 2003-06-12 2005-09-14 Shell Int Research Mecha perforadora con percusion, sistema de perforacion que incluye dicha mecha perforadora y un metodo para perforar un pozo
US7455126B2 (en) 2004-05-25 2008-11-25 Shell Oil Company Percussive drill bit, drilling system comprising such a drill bit and method of drilling a bore hole
US8327956B2 (en) * 2008-12-19 2012-12-11 Varel International, Ind., L.P. Multi-set PDC drill bit and method
US8544568B2 (en) * 2010-12-06 2013-10-01 Varel International, Inc., L.P. Shoulder durability enhancement for a PDC drill bit using secondary and tertiary cutting elements
EP2586960B1 (fr) * 2011-10-27 2016-01-13 Sandvik Intellectual Property AB Trépan doté d'un bouton enfoncé et outil de perçage de roche à utiliser avec un tel trépan
EP2612981B1 (fr) * 2012-01-09 2014-07-16 Sandvik Intellectual Property AB Trépan pour un marteau à percussion, manche et patte de rétention correspondante
US9784038B2 (en) * 2013-06-17 2017-10-10 Longyear Tm, Inc. High-productivity drill bits
CN103696697B (zh) * 2013-12-19 2017-01-04 北京科技大学 一种岩石深孔高速水钻头及其制备工艺
EP2921639A1 (fr) * 2014-03-18 2015-09-23 Sandvik Intellectual Property AB Trépan à percussion avec de multiples ensembles d'inserts de coupe avant
US10731420B2 (en) 2015-03-30 2020-08-04 Schlumberger Technology Corporation Indexing drill bit
CN104895500A (zh) * 2015-05-28 2015-09-09 山东中瑞工程机械有限公司 集束式潜孔锤用钻头
CN114718465B (zh) * 2022-04-18 2023-05-26 中南大学 一种动态拉剪掘进钻头及复合破岩方法

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US5025875A (en) * 1990-05-07 1991-06-25 Ingersoll-Rand Company Rock bit for a down-the-hole drill
DE4211048C1 (fr) * 1992-04-02 1993-05-06 Boart Hwf Gmbh & Co Kg Hartmetallwerkzeugfabrik, 6419 Burghaun, De
US6253864B1 (en) * 1998-08-10 2001-07-03 David R. Hall Percussive shearing drill bit
CA2260612C (fr) * 1999-02-03 2005-04-26 Dresser Industries, Inc. Marteau pneumatique a forage dirige
AUPR879901A0 (en) * 2001-11-13 2001-12-06 Sds Digger Tools Pty Ltd An improved transmission sleeve

Also Published As

Publication number Publication date
RU2005140560A (ru) 2006-07-10
EG23869A (en) 2007-11-26
CO5630007A2 (es) 2006-04-28
RU2332553C2 (ru) 2008-08-27
AR044551A1 (es) 2005-09-21
NO20056154L (no) 2006-02-17
DE602004003493D1 (de) 2007-01-11
DE602004003493T2 (de) 2007-09-20
CA2526249A1 (fr) 2004-12-02
CN100458097C (zh) 2009-02-04
WO2004104362A1 (fr) 2004-12-02
EP1627130A1 (fr) 2006-02-22
ATE347019T1 (de) 2006-12-15
BRPI0410536A (pt) 2006-06-20
CN1795318A (zh) 2006-06-28

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