EP0577545A1 - Trépan de forage - Google Patents

Trépan de forage Download PDF

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Publication number
EP0577545A1
EP0577545A1 EP93810153A EP93810153A EP0577545A1 EP 0577545 A1 EP0577545 A1 EP 0577545A1 EP 93810153 A EP93810153 A EP 93810153A EP 93810153 A EP93810153 A EP 93810153A EP 0577545 A1 EP0577545 A1 EP 0577545A1
Authority
EP
European Patent Office
Prior art keywords
drill bit
jaw
clearing
broaching
piston
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Withdrawn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
EP93810153A
Other languages
German (de)
English (en)
Inventor
Anton Broder
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.)
BRODER AG
Original Assignee
BRODER AG
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 BRODER AG filed Critical BRODER AG
Publication of EP0577545A1 publication Critical patent/EP0577545A1/fr
Withdrawn legal-status Critical Current

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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
    • E21B10/38—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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure

Definitions

  • the invention relates to a core bit with a crown body and at least one broaching jaw, which can be moved outwards by the pressure of the flushing medium and can be moved inwards again for pulling back the core bit.
  • Such drill bits are used in particular for drilling overlays.
  • Drill heads have already become known in which e.g. two clearing jaws can be moved in two guides arranged at an acute angle to the drilling axis on the drilling head. These boring jaws are moved outwards for drilling. When the drill head is pulled back, they strike with beveled surfaces at the lower end of the casing and are thereby shifted inward again (US-A-3 365 010, GB-A-973 790, US-A-1 075 843, US-A- 979 106).
  • the guides of the broaching jaws are exposed to the influences in the borehole while drilling, with the risk that they will be damaged and contaminated. This can result in the broaching jaws not being able to be retracted or not being retracted completely after drilling. This in turn causes the drill head to jam in the casing when it is pulled up, which can then lead to loss of the drill head or damage to the casing.
  • a drill bit has also become known, in which a piston actuated by the pressure of the flushing water has a Rack and toothed segments moved the clearing jaws to the extended position (US-A-1 752 092). With this drill bit, too, there is a risk that the toothed rack and toothed segments in the borehole will be damaged or contaminated, so that they jam and prevent the broaching jaws from entering.
  • DE-A-28 39 868 describes a drill bit with a crown body and several broaching jaws distributed over the end face, which can be moved outwards in a guide in the crown body during drilling and can be moved inwards again when the drill bit is withdrawn from the borehole.
  • the crown body has a chamber for each broaching jaw. This chamber is connected to a flushing water channel via a bore.
  • the clearing jaws are held in the outer position by the pressure of the flushing water.
  • the lower end of the casing tube acts on the clearing jaws in order to move them back into the corresponding chambers. With this drill bit, the guides are protected by the extended jaws during the drilling process.
  • eccentric drilling bits Because of the described disadvantages of the known drill bits with broaching jaws, these have mostly been replaced in the last few years by so-called eccentric drilling bits.
  • the actual crown of the eccentric boring heads is mounted eccentrically.
  • the drill bit can be from a first position in which it is concentric with the drill axis is moved to a second position in which it creates a borehole during drilling, the diameter of which is slightly larger than the diameter of the casing. Before the drill head is pulled up, the drill bit is pivoted back into the first position in which it fits into the casing.
  • the eccentric drill heads have the disadvantage that they are relatively complicated and accordingly expensive. When drilling in hard rock, eccentric drill heads are subject to extremely high wear and tear because the eccentric arrangement of the drill bit creates lateral forces so that the drill head grinds against the wall of the borehole.
  • the drill bit should in particular be reliable and simple and inexpensive to manufacture. According to the invention, this is achieved in that the clearing jaw is pivotally mounted in the crown body. This enables an extremely simple and cheap construction of the drill bit. Since no dovetail guides are provided, jamming of the clearing jaw is practically impossible.
  • the clearing jaw is expediently mounted in a chamber of the crown body. This results in a good transmission of the forces acting on the clearing jaw to the crown body.
  • the clearing jaw can expediently be pivoted about a bolt arranged in the crown body. This makes it possible to replace the clearing jaw with ease if necessary. All you have to do is remove the bolt. It can then be reinserted after inserting the new clearing jaw.
  • An expedient embodiment provides that the bolt protrudes into the chamber by about half its cross-section, that the clearing jaw has a recess into which the bolt engages and that the upper chamber wall acts as a stop and the lower chamber wall as a support for the clearing jaw is formed when pivoting. This results in an extremely simple construction. In operation, forces acting upwards on the clearing jaw are easily transferred to the crown body.
  • a piston which can be actuated by pressure of the flushing medium can be provided to pivot the clearing jaw outwards. This enables simple operation of the clearing jaw.
  • a return spring is expediently provided for resetting the piston.
  • An expedient design of the drill bit provides that the piston is arranged in an axial cylinder bore of the crown body and has a curve in order to pivot the clearing jaw outward when the piston is actuated. This represents a simple and reliable mechanism for actuating the clearing jaw. The curve advantageously works together with an actuating pin in order to pivot the clearing jaw outwards.
  • a particularly advantageous embodiment of the invention provides that the piston which can be actuated by the pressure of the flushing medium clears at least one passage through which the flushing medium can flow outwards through the chamber. This keeps the chamber clean, which in turn ensures problem-free pivoting of the clearing jaw inwards.
  • the clearing jaw can have a surface which is set at an angle to the drilling axis and can be placed against the lower end of the casing when the drill bit is pulled back. This results in a particularly simple and reliable construction.
  • a number of clearing jaws are expediently provided distributed over the crown body. This makes it possible to achieve a high drilling performance.
  • the drill bit 10 essentially consists of a crown body 11 and a plurality of pivotable broaching jaws 13.
  • the broaching jaws 13 are pivotably mounted in the crown body 11.
  • the respective clearing jaw can be pivoted about a bolt 15.
  • the bolt 15 is anchored in the bore 17 in the crown body 11. In Figures 2 and 4, only the common axes 19 of the bolts 15 and bores 17 are shown.
  • the respective clearing jaw 13 is suitably accommodated in a chamber 21. About half of its cross-section projects from the bolt 15 into the chamber 21.
  • the broaching jaw has a recess 23 into which the bolt 15 engages to form an axis about which the broaching jaw can be pivoted.
  • the upper chamber wall 25 acts as a stop and support for the clearing jaw 13.
  • the lower chamber wall 27 serves as a guide for the clearing jaw during pivoting. It can be seen from FIG. 1 that the chamber 21 remains closed by the clearing jaw 13, so that no rock particles can get inside the chamber 21.
  • a piston 31 which can be actuated by pressing the flushing medium against the force of the spring 29 is provided for pivoting the clearing jaw 13.
  • the piston 31 is arranged in an axial cylinder bore 33 of the crown body 11.
  • the piston 31 has a curve 35 which cooperates with an actuating pin 37 in order to pivot the clearing jaw 13 outwards and to block it in this position.
  • the channel 39 for the flushing medium leads through the shaft 41 into the crown body 11, where it can act on the piston 31.
  • Passages 43 lead from the channel 39 into the chambers 21 Chambers 21 lead outlets 45 to the front 47 of the drill bit.
  • the front side 47 is equipped with a plurality of drill pins 49 made of hard metal or the like.
  • the broaching jaws 13 also have drill pins 49.
  • the respective clearing jaw 13 has a surface 51 which, when the clearing jaw is pivoted out, is inclined to the drilling axis 53 and can be placed on the lower end of the casing tube 55 when the drill bit is pulled back, around the clearing jaw 13 if it is not moved inward by your own weight, to move inward.
  • the flushing medium presses e.g. Air, the piston 31 against the force of the spring 29 from the position in Fig. 3 in the position of Fig. 1.
  • the curves 35 press the actuating pins 37 outwards, so that the clearing jaws 13 in the position shown in Fig. 1 be pivoted. In this position, the clearing jaws 13 are well supported by the upper chamber walls 25. Forces acting in the upward direction on the broaching jaws 13 are therefore transmitted to the crown body 11. In contrast to the known prior art, there is no danger that stop pins will be sheared off by such forces.
  • the flushing medium can flow through the passages 43 into the chambers 21 and leave them through the outlets 45.
  • the material removed by the drill bit is conveyed upwards along the channels 57 by the flushing medium.

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)
EP93810153A 1992-06-19 1993-03-02 Trépan de forage Withdrawn EP0577545A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1949/92 1992-06-19
CH194992 1992-06-19

Publications (1)

Publication Number Publication Date
EP0577545A1 true EP0577545A1 (fr) 1994-01-05

Family

ID=4222364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810153A Withdrawn EP0577545A1 (fr) 1992-06-19 1993-03-02 Trépan de forage

Country Status (1)

Country Link
EP (1) EP0577545A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29513325U1 (de) * 1995-08-19 1995-10-19 Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik, 36151 Burghaun Bohrkrone
FR2740508A1 (fr) * 1995-10-31 1997-04-30 Elf Aquitaine Stabilisateur realeseur pour le forage d'un puits petrolier
WO2001029363A1 (fr) * 1999-10-15 2001-04-26 Psl Technology Limited Procede de forage d'un trou de sonde
GB2399366A (en) * 2003-03-13 2004-09-15 Security Dbs Nv Sa Well tool with extendable arms having limited movement
US7299887B2 (en) * 2002-04-23 2007-11-27 Kingdream Public Ltd. Co. Roller bit with a journal pin offset from the central axis thereof
US7658241B2 (en) 2004-04-21 2010-02-09 Security Dbs Nv/Sa Underreaming and stabilizing tool and method for its use
US7975783B2 (en) 2004-06-09 2011-07-12 Halliburton Energy Services, Inc. Reaming and stabilization tool and method for its use in a borehole
DE102010015474A1 (de) * 2010-04-16 2011-10-20 Stds-Jantz Gmbh & Co. Kg Bohr
KR20150110996A (ko) * 2014-03-24 2015-10-05 (주)씨엔피텍 굴착용 비트

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2839868A1 (de) * 1977-09-30 1979-04-05 Anton Broder Bohrkrone
US4565252A (en) * 1984-03-08 1986-01-21 Lor, Inc. Borehole operating tool with fluid circulation through arms
US4646826A (en) * 1985-07-29 1987-03-03 A-Z International Tool Company Well string cutting apparatus
GB2242379A (en) * 1990-03-29 1991-10-02 Smith International Junk mill
US5201817A (en) * 1991-12-27 1993-04-13 Hailey Charles D Downhole cutting tool
DE4211048C1 (fr) * 1992-04-02 1993-05-06 Boart Hwf Gmbh & Co Kg Hartmetallwerkzeugfabrik, 6419 Burghaun, De

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2839868A1 (de) * 1977-09-30 1979-04-05 Anton Broder Bohrkrone
US4565252A (en) * 1984-03-08 1986-01-21 Lor, Inc. Borehole operating tool with fluid circulation through arms
US4646826A (en) * 1985-07-29 1987-03-03 A-Z International Tool Company Well string cutting apparatus
GB2242379A (en) * 1990-03-29 1991-10-02 Smith International Junk mill
US5201817A (en) * 1991-12-27 1993-04-13 Hailey Charles D Downhole cutting tool
DE4211048C1 (fr) * 1992-04-02 1993-05-06 Boart Hwf Gmbh & Co Kg Hartmetallwerkzeugfabrik, 6419 Burghaun, De

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29513325U1 (de) * 1995-08-19 1995-10-19 Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik, 36151 Burghaun Bohrkrone
FR2740508A1 (fr) * 1995-10-31 1997-04-30 Elf Aquitaine Stabilisateur realeseur pour le forage d'un puits petrolier
EP0771932A1 (fr) * 1995-10-31 1997-05-07 Elf Aquitaine Production Stabilisateur réaléseur pour le forage de puits pétroliers
US5788000A (en) * 1995-10-31 1998-08-04 Elf Aquitaine Production Stabilizer-reamer for drilling an oil well
WO2001029363A1 (fr) * 1999-10-15 2001-04-26 Psl Technology Limited Procede de forage d'un trou de sonde
US7299887B2 (en) * 2002-04-23 2007-11-27 Kingdream Public Ltd. Co. Roller bit with a journal pin offset from the central axis thereof
US6929076B2 (en) 2002-10-04 2005-08-16 Security Dbs Nv/Sa Bore hole underreamer having extendible cutting arms
GB2399366B (en) * 2003-03-13 2006-08-16 Security Dbs Nv Sa Bore hole underreamer having extendible cutting arms
GB2399366A (en) * 2003-03-13 2004-09-15 Security Dbs Nv Sa Well tool with extendable arms having limited movement
US7658241B2 (en) 2004-04-21 2010-02-09 Security Dbs Nv/Sa Underreaming and stabilizing tool and method for its use
US7975783B2 (en) 2004-06-09 2011-07-12 Halliburton Energy Services, Inc. Reaming and stabilization tool and method for its use in a borehole
DE102010015474A1 (de) * 2010-04-16 2011-10-20 Stds-Jantz Gmbh & Co. Kg Bohr
DE102010015474B4 (de) * 2010-04-16 2015-12-10 Stds-Jantz Gmbh & Co. Kg Bohrkopf
KR20150110996A (ko) * 2014-03-24 2015-10-05 (주)씨엔피텍 굴착용 비트

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