WO1993006332A1 - Couronne de forage pour roches - Google Patents

Couronne de forage pour roches Download PDF

Info

Publication number
WO1993006332A1
WO1993006332A1 PCT/EP1992/002079 EP9202079W WO9306332A1 WO 1993006332 A1 WO1993006332 A1 WO 1993006332A1 EP 9202079 W EP9202079 W EP 9202079W WO 9306332 A1 WO9306332 A1 WO 9306332A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill bit
rock drill
air supply
face
purging air
Prior art date
Application number
PCT/EP1992/002079
Other languages
German (de)
English (en)
Inventor
Bernd BRÖKER
Rolf SCHÖNEWEISS
Michael Agricola
Original Assignee
Rudolf Hausherr & Söhne Gmbh & Co Kg
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 Rudolf Hausherr & Söhne Gmbh & Co Kg filed Critical Rudolf Hausherr & Söhne Gmbh & Co Kg
Publication of WO1993006332A1 publication Critical patent/WO1993006332A1/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
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • 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
    • E21B10/36—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
    • 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
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/076—Telescoping joints for varying drill string lengths; Shock absorbers between rod or pipe and drill bit

Definitions

  • the invention relates to a rock drill bit with cutting inserts, which are attached to the end face of the rock drill bit in the circumferential direction at an equal distance, a carbide tip which is formed in the center on the end face of the rock drill bit, a shank on the circumferential surface of which a multi-spline toothing is formed is, by means of which the rock drill bit is displaceably connectable in the axial direction to a hole hammer, and an axial purging air supply channel, through which purging air can be conveyed from the free shaft end to the end face of the rock drill bit.
  • the invention has for its object to provide a rock drill bit that can ensure reliable removal of the cuttings generated even when reversing rotary impact drilling is used.
  • the axial purging air supply duct is connected via a radial purging air inlet bore to a purging air space surrounding the free shaft end.
  • the radial arrangement of the purge air inlet bore with respect to the shaft ensures that the purge air supply channel is constantly connected to the purge air space surrounding the free shaft end.
  • the previously known scavenging air supply channels, the openings of which are designed as an axial extension of the scavenging air supply channel on the free end face of the shaft of the rock drill bit, are used for when the percussion piston hits the percussion hammer locked for a period of time. This results in irregularities with regard to the purging air supply to the bottom of the borehole. These irregularities no longer occur in the case of the purge air inlet bore which runs radially according to the invention.
  • a further improvement in the purging air supply and distribution on the end face of the rock drill bit or on the bottom of the borehole results if the axial purging air supply channel in front of the end face of the rock drill bit is divided into purging air supply bores, each of which is located on the end face of the rock drill bit in a main material discharge groove opens out, which is formed in the radial direction between in each case two of the cutting lugs equally spaced in the circumferential direction. This ensures a uniform supply of purging air in the area of the face of the rock drill bit that is particularly important for a uniform removal of the material obtained as cuttings.
  • the purging air supply bores leading to the other openings being connected to the purging air supply duct inclined to the central axis of the rock drill bit, it is possible for all of them Drilling from one side of the rock drill bit, namely from the free end face of the crown section forth to manufacture. It is no longer necessary to implement the rock drill bit in the production of the purging air supply channel and the purging air supply bore. Furthermore, the number of bores is reduced, since a section of the purge air supply channel on the crown section side can form a purge air supply bore.
  • the shaft end can advantageously be closed on its free end face. Since the free end face of the shaft end which is then available as a stop surface for the percussion piston is considerably increased, there is a lower surface pressure between the striking surface of the percussion piston and the free end face of the shaft end, so that longer service lives for the percussion piston and for the shaft of the Rock core bits can be achieved than would be possible with a shaft end that is open in the axial direction and thus has an annular end face.
  • the rock drill bit can be made with a symmetrical cross section over its entire length, which results in particularly favorable strength properties of the rock drill bit. This is of considerable importance since the mechanical stress on the rock drill bit is of considerable magnitude due to the action of the down-hole percussion hammer.
  • the rock drill bit described above can advantageously have two purging air supply holes.
  • a mouth of the scavenging air supply bores on the end face of the rock core bit can be reached in a particularly simple manner if the scavenging air supply bores are inclined radially inward towards the face side of the rock core bit.
  • a further improvement in the removal of the falling material from the bottom of the borehole results if auxiliary material removal centers are formed in the radial outer sections of the cutting inserts.
  • the rock drill bit is correctly centered on the center of the bottom of the borehole, which results in a comparatively uniform annular space surrounding the circumference of the rock drill bit, which results in the uniform removal of the cuttings accumulating on the borehole and transported radially outwards by the main and auxiliary material discharge grooves is made considerably easier.
  • a uniform removal of the borehole bottom, which is advantageous for centering the rock drill bit, is achieved if the cutting inserts are arranged on their respective cutting diameter in such a way that their cutting grooves, which are produced when drilling is preferably reversed between 180 degrees and 240 degrees, overlap.
  • FIG. 1 shows an embodiment of the rock bit according to the invention, partly in section
  • FIG. 2 shows a top view of the end face of the rock drill bit shown in FIG. 1;
  • FIG. 3 shows the rock drill bit shown in FIG. 1 following an in-hole percussion hammer
  • FIG. 5 shows a top view of the end face of the rock drill bit shown in FIG. 4;
  • FIG. 6 shows the rock drill bit shown in FIG. 4 following an in-hole percussion hammer
  • FIG. 7 shows a third embodiment of the rock drill bit according to the invention, partly in section
  • FIG. 8 shows a top view of the end face of the rock drill bit shown in FIG. 7;
  • Fig. 9 the rock drill bit shown in Fig. 7 in Connection to a punch hammer.
  • a rock drill bit 1 shown in FIG. 1 has a crown section 2 oriented towards the bottom of the borehole and a shaft 3 oriented towards the end of the rock drill bit 1 remote from the bottom of the borehole.
  • the cutting inserts 4 are arranged in a symmetrical manner on the end face of the rock drill bit 1, namely in the circumferential direction of the rock drill bit on a radial outer section of the end face of the rock drill bit are equally spaced.
  • a hard metal centering tip 6 is formed in the central section of the end face of the rock drill bit 1 free of the cutting inserts 4. As can be seen from FIG. 1, this protrudes with its free tip by an excess or distance x beyond the cutting elements 5 of the cutting inserts 4 closest to the bottom of the borehole. This ensures reliable centering of the rock core on the bottom of the borehole.
  • main material removal grooves 7 formed between the mutually spaced cutting inserts 4, which are formed by the approximately axially oriented wall surfaces of the cutting inserts 4 and by the cutting insert-free sections of the end face of the rock drill bit 1.
  • two auxiliary material removal grooves 8 are formed in the radial outer sections of the cutting inserts 4, which contribute to the removal of the material obtained as cuttings from the bottom of the borehole into the annular space.
  • a mouth 9 is formed which is directly adjacent to the hard metal centering tip and which is in each case the opening area of a flushing air supply bore 10, which is formed in the crown section 2 of the rock core and has an axial center line of the rock core 1.
  • Each of the four purging air supply bores in the exemplary embodiment shown merges at its end remote from the end face into a purging air supply duct 11, which supplies the purging air supply bores 10 with purging air and which penetrates the shaft 3 of the rock drill bit 1 in the center in the axial direction.
  • At least one radial purge air inlet bore 13 is formed in the wall of the shaft 3 surrounding the purge air supply duct 11.
  • the purging air supply channel 11 leading to the bottom of the borehole is connected to a purging air space 14 surrounding the free shaft end 12 of the shaft 3 of the rock drill bit 1, the purging air between the inner circumferential wall of an in-hole hammer 15 and the free shaft end 12 of the shaft 3 the rock drill bit 1 is formed.
  • a splined toothing 16 which engages with a splined toothing part 17 designed accordingly on the inner peripheral wall of the punch hammer.
  • the engagement of the multi-spline toothing 16 on the side of the rock drill bit in the multi-spline toothing part 17 on the side of the percussion hammer ensures a rotationally fixed connection between the down-hole percussion hammer 15 and the rock drill bit 1 without an axial movement of the stone drill bit 1 with respect to the down-hole percussion hammer 15 being prevented.
  • An embodiment of the rock bit shown in the Figures 4 to 6 differs from that shown in Figures 1 through 3, characterized in that the Spippo povertyzuchtkanal 11 extends inclined with respect to the center axis of the rock bit 1, ie, the means ⁇ axis of Spül povertyzuzukarkanals and 4 the vertical central axis of the rock drill bit 1 enclose a comparatively small angle. Furthermore, the axial purging air supply duct 11 shown in FIG. 4 is extended beyond its connection point to the purging air supply bores 10, so that it is connected to the crown section
  • the purge air supply channel 11 can be drilled as a blind hole from the free end face of the crown section 2 of the rock drill bit 1. Accordingly, the shaft end 12 is closed on its free end face. The supply of the scavenging air supply duct 11 closed on the end face of the shaft end 12 takes place through the radial purging air inlet bores 13. Since the shaft end 12 is closed on its free end face, the entire, closed free end face of the shaft end 12 is available as the stop face for the striking piston 18.
  • FIGS. 7-9 differs from the embodiments shown in the above in that the supply to the free end face of the crown section 2 of the rock drill bit 1 instead of through a flushing air arranged more or less centrally in the rock drill bit 1 ⁇ guide channel 11 through an annular space 21 surrounding the outer diameter of the shaft 3 of the rock drill bit 1, which is closed to the outside by a corresponding section of the housing of the down-hole hammer 15.
  • the annular space 21 surrounding the shaft 3 is connected via millings 19 which interrupt a guide section 20, by means of which the rock drill bit 1 is guided in the radial direction, in the circumferential direction.
  • the annular space 21 is connected to the free end face of the crown section 2 of the rock drill bit 1 via the purging air supply bores 10, two of which are provided in the exemplary embodiment shown and which face the free end face of the crown section 2 of the rock Drill bit 1 are inclined radially inwards in the direction of the main axis of the rock drill bit 1.
  • This configuration of the rock drill bit 1 enables a symmetrical cross section to be achieved over the entire length of the rock drill bit 1, as a result of which the strength properties of the rock drill bit 1 are advantageously influenced.

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)

Abstract

Une couronne de forage pour roches a des plaquettes de coupe (4) amovibles, fixées sur la face frontale de la couronne (1) de manière équidistante, sur la circonférence, une pointe de centrage en métal dur (6) qui est centrée sur la face frontale de la couronne (1), un arbre (3) dont la surface circonférentielle présente une denture à clavettes multiples (16) permettant de raccorder la couronne (1), de manière axialement mobile, à un marteau à percussion travaillant dans le trou (15), et un canal d'amenée d'air de balayage (11) à travers lequel de l'air de balayage peut être amené depuis l'extrémité libre (12) de l'arbre vers la face frontale de la couronne (1). Afin d'assurer une alimentation continue en air de balayage, le canal axial (11) est raccordé au moins par un trou d'entrée d'air (13) à un espace d'air (14) entourant l'extrémité libre (12) de l'arbre.
PCT/EP1992/002079 1991-09-13 1992-09-09 Couronne de forage pour roches WO1993006332A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4130528 1991-09-13
DEP4130528.0 1991-09-13
DEP4200580.9 1992-01-11
DE19924200580 DE4200580A1 (de) 1991-09-13 1992-01-11 Gesteinsbohrkrone

Publications (1)

Publication Number Publication Date
WO1993006332A1 true WO1993006332A1 (fr) 1993-04-01

Family

ID=25907312

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002079 WO1993006332A1 (fr) 1991-09-13 1992-09-09 Couronne de forage pour roches

Country Status (4)

Country Link
EP (1) EP0557485A1 (fr)
DE (1) DE4200580A1 (fr)
FI (1) FI932142A (fr)
WO (1) WO1993006332A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3059383A1 (fr) 2015-02-19 2016-08-24 Sandvik Intellectual Property AB Trépan pour améliorer le transport des déblais de forage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803192A (en) * 1996-05-13 1998-09-08 Holte; Ardis L. Drill bit retainer for a down hole hammer assembly
SE523946C2 (sv) * 2001-12-21 2004-06-08 Atlas Copco Secoroc Ab Sänkborrhammare där ytterröret helt omsluter en medbringare
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1811202A1 (de) * 1967-11-28 1969-07-17 Padley & Venables Ltd Bohrer
US4043409A (en) * 1975-03-22 1977-08-23 Walter Hans Philipp Drill steel for deep drill hammers
US4098352A (en) * 1976-12-17 1978-07-04 Kennametal Inc. Percussion bit with bypass channel therein
US4321974A (en) * 1978-12-16 1982-03-30 Hydroc Gesteinsbohrtechnik Gmbh Annular drilling hammer
EP0048908A1 (fr) * 1980-09-26 1982-04-07 Hawera Probst GmbH + Co. Foret, particulièrement destiné au perçage rotatif par percussion
EP0197019A1 (fr) * 1985-04-04 1986-10-08 Santrade Ltd. Trépan
DE3905106A1 (de) * 1989-02-20 1990-08-23 Fritz Zimmermann Masch U Appar Tiefloch-bohrhammer mit wasserspueleinrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1811202A1 (de) * 1967-11-28 1969-07-17 Padley & Venables Ltd Bohrer
US4043409A (en) * 1975-03-22 1977-08-23 Walter Hans Philipp Drill steel for deep drill hammers
US4098352A (en) * 1976-12-17 1978-07-04 Kennametal Inc. Percussion bit with bypass channel therein
US4321974A (en) * 1978-12-16 1982-03-30 Hydroc Gesteinsbohrtechnik Gmbh Annular drilling hammer
EP0048908A1 (fr) * 1980-09-26 1982-04-07 Hawera Probst GmbH + Co. Foret, particulièrement destiné au perçage rotatif par percussion
EP0197019A1 (fr) * 1985-04-04 1986-10-08 Santrade Ltd. Trépan
DE3905106A1 (de) * 1989-02-20 1990-08-23 Fritz Zimmermann Masch U Appar Tiefloch-bohrhammer mit wasserspueleinrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3059383A1 (fr) 2015-02-19 2016-08-24 Sandvik Intellectual Property AB Trépan pour améliorer le transport des déblais de forage
CN107429546A (zh) * 2015-02-19 2017-12-01 山特维克知识产权股份有限公司 用于切屑的改进输送的钻头
US10344536B2 (en) 2015-02-19 2019-07-09 Sandvik Intellectual Property Ab Drill bit for improved transport of cuttings
AU2016221942B2 (en) * 2015-02-19 2020-07-23 Sandvik Intellectual Property Ab Drill bit for improved transport of cuttings

Also Published As

Publication number Publication date
FI932142A0 (fi) 1993-05-12
EP0557485A1 (fr) 1993-09-01
FI932142A (fi) 1993-05-12
DE4200580A1 (de) 1993-03-18

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