WO1998020229A1 - Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment - Google Patents
Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment Download PDFInfo
- Publication number
- WO1998020229A1 WO1998020229A1 PCT/SE1997/001848 SE9701848W WO9820229A1 WO 1998020229 A1 WO1998020229 A1 WO 1998020229A1 SE 9701848 W SE9701848 W SE 9701848W WO 9820229 A1 WO9820229 A1 WO 9820229A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ring
- halves
- drill bit
- casing
- wall
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 7
- 238000009527 percussion Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 2
- 230000004323 axial length Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- 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
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/14—Casing shoes for the protection of the bottom of the casing
-
- 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
- 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
Definitions
- the present invention relates to overburden drilling equipment and a casing shoe, wherein the overburden drilling equipment comprises a drill bit body having a connection section at a rear end for connection to a percussive unit such as a down-the-hole hammer and defining a rotational axis of a drill bit, and a casing shoe for attachment to a casing, the casing shoe connected to the drill bit body by mutual engagement of a groove and a collar in a lap-joint.
- a percussive unit such as a down-the-hole hammer and defining a rotational axis of a drill bit
- Overburden drilling equipment is previously disclosed in U. S. Patent No. 5,255,960, for example. It has been found favorable to construct overburden drilling equipment such that the casing and the rock drill bit are relatively rotatable while simultaneously axially connected, so that the drill bit pulls the casing along as the drill bit advances in the ground.
- the solution to such relative rotation is described in the above-named patent as a "lap- joint", wherein the casing, or a casing shoe attached to the front of casing, axially overlaps the drill bit.
- a split collar welded to the inside of the casing projects into a circumferential groove formed in the drill bit enabling the drill bit to pull the casing along.
- An object of the present invention is to provide an overburden drilling equipment, a casing collar per se, and a method of attaching a casing collar, which obviate the above-mentioned drawbacks.
- an overburden drilling equipment comprising a drill bit body, and a casing shoe.
- the drill bit body which defines a longitudinal axis of rotation, includes a cutting face at a longitudinal front end of the body, and a connection section at a longitudinal rear end of the body adapted for connection with a percussive unit .
- the casing shoe is generally cylindrical and is adapted for attachment to a casing.
- the drill bit body includes a radially outwardly extending, longitudinally forwardly facing first wall.
- the casing shoe includes a radially inwardly extending, longitudinally rearwardly facing second wall facing the first wall to be engaged and longitudinally advanced thereby during a drilling operation.
- the casing shoe comprises two substantially identical semi-cylindrical halves, and an endless substantially circular ring extending coaxially around the halves to hold the halves together.
- the ring is welded to the halves by front and rear welds disposed at front and rear sides, respectively of the ring.
- the ring is preferably formed in circumferential recesses formed in front ends of the respective halves, the recesses being circumferentially aligned with one another.
- the invention also pertains the casing shoe per se, and to a method of mounting the casing shoe on a drill bit body.
- Fig. 1A shows an exploded view of an overburden drilling equipment according to the present invention
- Fig. IB shows a left half of the equipment in side view, and a right half of the overburden drilling equipment in longitudinal section;
- Fig. 1C shows an enlargement of a joint between a ring bit and a casing shoe of the overburden drilling equipment shown in Fig. IB;
- Fig. 2A shows a side view of one half of a casing shoe
- Fig. 2B shows an assembled two-piece casing shoe in a front view
- Fig. 3 shows a one-piece ring in plan view
- Fig. 4 shows a section of the one piece ring taken along line 4-4 in Fig. 3;
- Fig. 5 shows a joint between a ring bit and a casing shoe of an alternative overburden drilling equipment according to the present invention in a view similar to Fig. lC.
- Figs. 1A-C there is shown a preferred embodiment of overburden drilling equipment according to the present invention.
- the equipment 10 comprises a down-the-hole hammer 11, a pilot drill bit 12, a ring drill bit 13, a casing shoe 14 and a casing 15.
- the pilot drill bit 12 and the ring drill bit 13 together define a drill bit body.
- the hammer 11 is preferably of the pneumatic type and produces axial impacts against the pilot drill bit 12.
- the pilot drill bit is provided with cemented carbide inserts 18 and is connected to the ring bit 13 via threads, splines or protrusions 16.
- the ring bit is provided with cemented carbide inserts 19 and is connected to the casing shoe 14 in a manner allowing relative rotational movement between the ring bit 13 and the casing shoe 14 about the rotational axis CL.
- the casing shoe is rigidly connected to the casing 15, preferably by means of a weld.
- the equipment is similar to prior art, and the general idea of this kind of equipment is to drill a hole with the equipment and to leave the ring bit, casing shoe and the casing in the hole by uncoupling the pilot bit from the ring bit before retracting the hammer and the pilot bit therefrom. It would be possible to retract the entire equipment if the ground around the casing is of such a nature as to remain stable after retraction of the equipment.
- the ring bit 13 includes at an axial inner end thereof a circumferentially extending external collar 20 comprising axially spaced walls 21 and 22, facing longitudinally forwardly and rearwardly, respectively, and extending substantially perpendicular to the rotational axis CL .
- the wall 21 cooperates with a longitudinally rearwardly facing wall 24A to form in the ring bit a circumferential groove 23A having a floor 24B.
- a circumferentially extending internal groove 23 is provided in the casing shoe 14 for receiving the collar 10.
- the groove 23 is bordered by axially spaced walls 24 and 25 facing longitudinally rearwardly and forwardly, respectively, and extending substantially perpendicular to the axis CL .
- the axial length of the groove is larger than the axial length of the collar, so as to allow some axial movement of the casing relative to the ring bit. These lengths are chosen, however, such that the free or outer end 40 of the casing shoe never impacts on the ring bit.
- the casing shoe 14 comprises two substantially identical, mirror-imaged halves 14A and 14B of generally semi-cylindrical shape (see Figs. 2A and 2B) .
- a circumferential recess 26 comprising a first or front bevel 27, a land 28 and a second or rear bevel 29.
- the land 28 is substantially parallel with the rotational axis CL and connects to the first bevel 27 over an external corner defining an obtuse angle.
- the land 28 connects to the second bevel 29 over an internal corner defining an obtuse angle.
- the first bevel 27 and the second bevel 29 are substantially parallel.
- Longitudinal edges 30 of the halves are prepared for welding by being shaped as longitudinally extending bevels which together form an angle ⁇ for receiving a weld.
- a ring 31 is provided to position the two halves in preparation for the welding (see Figs. 3 and 4) .
- the ring 31 has a substantially rhomboidal cross-section and comprises parallel, planar, radially spaced internal and external surfaces 32, 33 and two axially spaced surfaces 34 and 35 each extending obliquely relative to the rotational axis CL .
- Each of the inclined surfaces 34 and 35 forms an acute angle a with a line P extending perpendicular to the rotational axis CL.
- the angle a is preferably about 30° .
- the casing shoe 14 is mounted to the ring bit 13 in the following way.
- the smallest diameter of the ring 31 is larger than the largest diameter of the collar 20 of the ring bit 13. This means that the ring can be positioned around a floor 23A of the groove 23 of the ring bit, as illustrated at 31A by dotted lines in Fig. 1C.
- the halves 14A and 14B of the casing shoe 14 are placed around the ring bit such that the groove 23 of the casing shoe receives the collar 20 of the ring bit. While halves are held around the ring bit, the ring 31 is slipped axially over the circumferentially aligned recess 26 such that the halves become positioned relative to each other and relative to the ring bit.
- front and rear V-shaped recesses formed by the inclined surfaces 34, 35 of the ring and the first and second bevels 27 and 29, respectively, of the casing shoe are adapted for welding.
- Welding is performed by first filling the formed recesses with welding material, thereby creasing an axially forward weld 36 and an axially rearward weld 37.
- the longitudinally extending joints formed by the bevels 30 are welded together.
- the longitudinally extending bevels 30 may be welded first.
- a casing shoe for an overburden drilling equipment can be produced with a durable weld, such that the axial advancing of the casing can be maintained during a substantial period of time. Furthermore, there has been developed a large access space for applying the weld, which makes the equipment easier to produce.
- Fig. 5 an alternative embodiment of overburden drilling equipment according to the present invention is shown in a view similar to Fig. IB.
- the periphery of the ring bit 13' is provided with a circumferentially extending internal groove 23 ' comprising axially spaced walls 21' and 22' extending substantially perpendicular to the rotational axis CL .
- a corresponding circumferentially extending external collar 20' is provided on the casing shoe 14'.
- the collar 20' is bordered by axially spaced walls 24' and 25'.
- the axial length of the groove 23 ' is larger than the axial length of the collar 20', so as to allow some axial movement of the casing relative to the ring bit.
- the axial lengths are chosen, however, such that the axially forward weld 36' of the casing shoe is allowed to impact on the ring bit.
- the weld 36' that forms the impacting surface 25' can be formed of a material which is durable under such impacts.
- the drill bit body In operation of the overburden equipment, the drill bit body is rotated while being impacted by the percussion device, to drill a hole. As the bit body advances, the wall 24 of the ring bit engages the wall 21 of the casing shoe to pull the casing along. Fluid is conducted through internal passages 50, 52 to the front of the bit body to cool and clean the inserts 18. That fluid, along with cuttings entrained therein, exits the hole through a return channel 54 disposed radially internally of the casing shoe, and then travels within the casing 15.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL12961097A IL129610A (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
JP52130198A JP2001503488A (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching casing to drill bit of topsoil rig |
AU49738/97A AU717418B2 (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
CA002270959A CA2270959A1 (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
EP97912613A EP1025336A1 (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
NZ335438A NZ335438A (en) | 1996-11-08 | 1997-11-05 | Apparatus for attaching a casing to a drill bit in overburden drilling equipment |
NO992236A NO992236D0 (en) | 1996-11-08 | 1999-05-07 | Method and apparatus for attaching a casing to a drill bit in overlay drilling equipment |
HK00100226A HK1021398A1 (en) | 1996-11-08 | 2000-01-14 | Overburden drilling apparatus, a casing shoe and a method for installing the casing shoe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/746,268 US5839519A (en) | 1996-11-08 | 1996-11-08 | Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
US08/746,268 | 1996-11-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998020229A1 true WO1998020229A1 (en) | 1998-05-14 |
Family
ID=25000123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/001848 WO1998020229A1 (en) | 1996-11-08 | 1997-11-05 | Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
Country Status (12)
Country | Link |
---|---|
US (1) | US5839519A (en) |
EP (1) | EP1025336A1 (en) |
JP (1) | JP2001503488A (en) |
KR (1) | KR20000053166A (en) |
CN (1) | CN1080813C (en) |
AU (1) | AU717418B2 (en) |
CA (1) | CA2270959A1 (en) |
HK (1) | HK1021398A1 (en) |
IL (1) | IL129610A (en) |
NO (1) | NO992236D0 (en) |
NZ (1) | NZ335438A (en) |
WO (1) | WO1998020229A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6722454B2 (en) | 2000-02-24 | 2004-04-20 | Techmo Entwicklungs- Und Vertriebs Gmbh | Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes |
WO2010071563A1 (en) * | 2008-12-18 | 2010-06-24 | Sandvik Intellectual Property Ab | Drilling tool for percussive rock drilling as well as an expendable kit, a ring drill bit and a casing shoe therefor |
WO2015059341A1 (en) | 2013-10-22 | 2015-04-30 | Tri-Mach Oy | Drilling device |
WO2017089647A1 (en) * | 2015-11-26 | 2017-06-01 | Oy Atlas Copco Rotex Ab | Method in down-the-hole drilling and a down-the-hole drilling device |
EP2627851A4 (en) * | 2010-10-15 | 2017-12-27 | Robit Rocktools LTD. | Drill assembly |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPN357995A0 (en) * | 1995-06-15 | 1995-07-06 | Rear, Ian Graeme | Down hole hammer assembly |
US6536520B1 (en) | 2000-04-17 | 2003-03-25 | Weatherford/Lamb, Inc. | Top drive casing system |
US6857487B2 (en) * | 2002-12-30 | 2005-02-22 | Weatherford/Lamb, Inc. | Drilling with concentric strings of casing |
EP1626159B1 (en) * | 2000-05-05 | 2008-02-20 | Weatherford/Lamb, Inc. | Apparatus and methods for forming a lateral wellbore |
US6702040B1 (en) * | 2001-04-26 | 2004-03-09 | Floyd R. Sensenig | Telescopic drilling method |
US7004263B2 (en) * | 2001-05-09 | 2006-02-28 | Schlumberger Technology Corporation | Directional casing drilling |
GB2380746B (en) * | 2001-10-09 | 2006-02-15 | Smith International | Wellbore recovery operation |
US7730965B2 (en) | 2002-12-13 | 2010-06-08 | Weatherford/Lamb, Inc. | Retractable joint and cementing shoe for use in completing a wellbore |
FI115661B (en) * | 2002-12-23 | 2005-06-15 | Robit Rocktools Ltd | A bit assembly |
USRE42877E1 (en) | 2003-02-07 | 2011-11-01 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
CA2432246C (en) * | 2003-06-12 | 2009-07-28 | Luc Charland | System for overburden drilling |
US7650944B1 (en) | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
US20050126826A1 (en) * | 2003-12-12 | 2005-06-16 | Moriarty Keith A. | Directional casing and liner drilling with mud motor |
US7086485B2 (en) * | 2003-12-12 | 2006-08-08 | Schlumberger Technology Corporation | Directional casing drilling |
US20050133268A1 (en) * | 2003-12-17 | 2005-06-23 | Moriarty Keith A. | Method and apparatus for casing and directional drilling using bi-centered bit |
US7182153B2 (en) * | 2004-01-09 | 2007-02-27 | Schlumberger Technology Corporation | Methods of casing drilling |
JP4696489B2 (en) * | 2004-07-29 | 2011-06-08 | 三菱マテリアル株式会社 | Drilling tool |
GB2424432B (en) | 2005-02-28 | 2010-03-17 | Weatherford Lamb | Deep water drilling with casing |
US7857052B2 (en) | 2006-05-12 | 2010-12-28 | Weatherford/Lamb, Inc. | Stage cementing methods used in casing while drilling |
US8276689B2 (en) | 2006-05-22 | 2012-10-02 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with casing |
US7617879B2 (en) * | 2006-11-14 | 2009-11-17 | Halliburton Energy Services, Inc. | Casing shoe |
US20090271161A1 (en) * | 2008-04-25 | 2009-10-29 | Baker Hughes Incorporated | Arrangement of cutting elements on roller cones for earth boring bits |
JP5402397B2 (en) * | 2009-08-21 | 2014-01-29 | 三菱マテリアル株式会社 | Drilling tools |
JP5899620B2 (en) * | 2011-01-26 | 2016-04-06 | 三菱マテリアル株式会社 | Excavation tool and manufacturing method thereof |
CN102400652A (en) * | 2011-11-30 | 2012-04-04 | 杨智恺 | Pipe shoe self-adapting to stratum environment |
JP2013124535A (en) * | 2011-12-16 | 2013-06-24 | Ybm Co Ltd | Excavation apparatus and method for forming underground heat exchanger installation hole |
EP2778338A3 (en) * | 2013-03-11 | 2016-07-20 | Lövab Aktiebolag | Drill bit assembly |
EP3011127B1 (en) * | 2013-07-26 | 2022-01-19 | TerraRoc Finland Oy | Method in putting together of a down-the-hole drilling apparatus and a down-the-hole drilling apparatus |
JP6307979B2 (en) * | 2014-03-31 | 2018-04-11 | 三菱マテリアル株式会社 | Drilling tools |
USD802637S1 (en) | 2016-09-09 | 2017-11-14 | Robit Oyj | Ring bit |
USD807417S1 (en) | 2016-09-09 | 2018-01-09 | Robit Oyj | Ring bit |
USD802638S1 (en) | 2016-09-09 | 2017-11-14 | Robit Oyj | Ring bit |
USD807418S1 (en) | 2016-09-09 | 2018-01-09 | Robit Oyj | Ring bit |
CN108166480A (en) * | 2016-12-08 | 2018-06-15 | 金门机械设备有限公司 | Continuous mutual buckle type pile pile wall or cofferdam construction method |
USD861051S1 (en) | 2018-03-13 | 2019-09-24 | Robit Oyj | Drill bit |
USD870168S1 (en) | 2018-03-13 | 2019-12-17 | Robit Oyj | Drill bit |
KR102248930B1 (en) * | 2019-01-30 | 2021-05-07 | 광성지엠(주) | Drilling bit with casing shoe assembly |
CN113187394A (en) * | 2021-05-21 | 2021-07-30 | 四川宝鑫建设有限公司 | Front sand rear rock geological inclined angle steel sleeve drilling system and installation method thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1995034740A1 (en) * | 1994-06-10 | 1995-12-21 | Ilomaeki Valto | Drilling apparatus |
WO1996004456A1 (en) * | 1994-08-03 | 1996-02-15 | Ilomaeki Valto | A drilling apparatus |
WO1996015351A1 (en) * | 1994-11-14 | 1996-05-23 | Ilomaeki Valto | A drilling apparatus bit assembly and method to remove drill waste |
WO1996018798A1 (en) * | 1994-12-13 | 1996-06-20 | Ilomaeki Valto | A drilling method and bit assembly to realize the method |
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US3190378A (en) * | 1962-09-18 | 1965-06-22 | Sr Paul H Davey | Apparatus for simultaneously drilling and casing a well hole |
BE750586A (en) * | 1969-05-30 | 1970-11-03 | Klemm Bohrtech | DRILLING MACHINE FOR COVERING GROUNDS, CALLED "WAGON-DRILL" AND METHOD FOR ITS USE |
US3768576A (en) * | 1971-10-07 | 1973-10-30 | L Martini | Percussion drilling system |
US4819746A (en) * | 1987-01-13 | 1989-04-11 | Minroc Technical Promotions Ltd. | Reverse circulation down-the-hole hammer drill and bit therefor |
SE8901200L (en) * | 1989-04-05 | 1990-10-06 | Uniroc Ab | DEVICE FOR FLUSHING A DRILL |
SE501988C2 (en) * | 1989-04-05 | 1995-07-10 | Uniroc Ab | Drilling tools for drilling in soil and covered rock |
FI86332C (en) * | 1989-09-27 | 1992-08-10 | Valto Ilomaeki | Tunnel drill and procedure for its control |
SE469568B (en) * | 1992-02-25 | 1993-07-26 | Oesten Edman | SETTING TO EXERCISE DRILLING IN EARTH STORES AND SHOOTING BEFORE SETTING |
-
1996
- 1996-11-08 US US08/746,268 patent/US5839519A/en not_active Expired - Fee Related
-
1997
- 1997-11-05 CN CN97199531A patent/CN1080813C/en not_active Expired - Fee Related
- 1997-11-05 IL IL12961097A patent/IL129610A/en not_active IP Right Cessation
- 1997-11-05 AU AU49738/97A patent/AU717418B2/en not_active Ceased
- 1997-11-05 KR KR1019990704105A patent/KR20000053166A/en not_active Application Discontinuation
- 1997-11-05 WO PCT/SE1997/001848 patent/WO1998020229A1/en not_active Application Discontinuation
- 1997-11-05 JP JP52130198A patent/JP2001503488A/en active Pending
- 1997-11-05 EP EP97912613A patent/EP1025336A1/en not_active Withdrawn
- 1997-11-05 CA CA002270959A patent/CA2270959A1/en not_active Abandoned
- 1997-11-05 NZ NZ335438A patent/NZ335438A/en unknown
-
1999
- 1999-05-07 NO NO992236A patent/NO992236D0/en not_active Application Discontinuation
-
2000
- 2000-01-14 HK HK00100226A patent/HK1021398A1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995034740A1 (en) * | 1994-06-10 | 1995-12-21 | Ilomaeki Valto | Drilling apparatus |
WO1996004456A1 (en) * | 1994-08-03 | 1996-02-15 | Ilomaeki Valto | A drilling apparatus |
WO1996015351A1 (en) * | 1994-11-14 | 1996-05-23 | Ilomaeki Valto | A drilling apparatus bit assembly and method to remove drill waste |
WO1996018798A1 (en) * | 1994-12-13 | 1996-06-20 | Ilomaeki Valto | A drilling method and bit assembly to realize the method |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6722454B2 (en) | 2000-02-24 | 2004-04-20 | Techmo Entwicklungs- Und Vertriebs Gmbh | Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes |
WO2010071563A1 (en) * | 2008-12-18 | 2010-06-24 | Sandvik Intellectual Property Ab | Drilling tool for percussive rock drilling as well as an expendable kit, a ring drill bit and a casing shoe therefor |
EP2627851A4 (en) * | 2010-10-15 | 2017-12-27 | Robit Rocktools LTD. | Drill assembly |
WO2015059341A1 (en) | 2013-10-22 | 2015-04-30 | Tri-Mach Oy | Drilling device |
EP3060742A4 (en) * | 2013-10-22 | 2017-06-14 | Tri-Mach Oy | Drilling device |
WO2017089647A1 (en) * | 2015-11-26 | 2017-06-01 | Oy Atlas Copco Rotex Ab | Method in down-the-hole drilling and a down-the-hole drilling device |
Also Published As
Publication number | Publication date |
---|---|
CN1236414A (en) | 1999-11-24 |
EP1025336A1 (en) | 2000-08-09 |
US5839519A (en) | 1998-11-24 |
IL129610A (en) | 2001-07-24 |
HK1021398A1 (en) | 2000-06-09 |
NZ335438A (en) | 2001-05-25 |
KR20000053166A (en) | 2000-08-25 |
NO992236L (en) | 1999-05-07 |
IL129610A0 (en) | 2000-02-29 |
NO992236D0 (en) | 1999-05-07 |
AU717418B2 (en) | 2000-03-23 |
CA2270959A1 (en) | 1998-05-14 |
CN1080813C (en) | 2002-03-13 |
AU4973897A (en) | 1998-05-29 |
JP2001503488A (en) | 2001-03-13 |
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