EP2675982B1 - Verfahren und vorrichtung für abwärtslochbohrungen - Google Patents

Verfahren und vorrichtung für abwärtslochbohrungen Download PDF

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EP2675982B1
EP2675982B1 EP12839207.3A EP12839207A EP2675982B1 EP 2675982 B1 EP2675982 B1 EP 2675982B1 EP 12839207 A EP12839207 A EP 12839207A EP 2675982 B1 EP2675982 B1 EP 2675982B1
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Prior art keywords
drilling
flushing
flow
channels
flushing medium
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EP12839207.3A
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French (fr)
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EP2675982A4 (de
EP2675982A1 (de
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Antti Virjula
Kai Gylling
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Tercope Finland Oy
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Epiroc Drilling Tools Oy AB
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    • 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
    • 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

Definitions

  • the invention relates to a method and apparatus for down-the-hole drilling according to the preambles of the independent claims related thereto.
  • a boring tool which is meant for boring and/or hammer drilling, to be used in connection with a drill rod unit placed inside a mantle pipe.
  • the boring tool to be attached at the front end of the drill rod unit has a center drill, being provided with a cutting unit, and an eccentric reaming drill, being placed after the center drill, the reaming drill having also a cutting unit.
  • the reaming drill moves with respect to the center drill between a drilling position, in which it is positioned sidewards in front of the mantle pipe, and a return position, in which it is withdrawn in radial direction inside the mantle pipe.
  • the center drill is in most cases provided with four cutting parts directed radially and being made of hard metal
  • the reamer for its part comprising either one or two radially directed cutting parts made of hard metal
  • the cutting parts are replaced by bit parts being arranged in a certain manner.
  • the drilling head of the drilling unit of the drilling apparatus existing inside a casing part or in other words a so called casing pipe according to this patent, is formed of a first frame part and an annular second frame part, in the drilling surfaces of which there has been arranged drilling organs, such as drill bits or like, of the first and second drilling means or in other words of the pilot and the reamer.
  • the first drilling means that is the first frame part forming the pilot is being released from the second frame part forming the reamer in order to pull the same alone off from a drilled hole after the drilling situation.
  • the second organs of the flushing means for removal of drilling waste being generated are arranged to lead drilling waste by means of an assembly belonging to the counterpart surface arrangement, which connects the said drilling means together for a drilling situation unrotatively in respect with each other and in both directions longitudinally, which, in other words, is being carried out as an advantageous embodiment by loosening grooves, belonging to a bayonet coupling, placed longitudinally in the outer periphery of the first frame part.
  • pile drilling has rapidly become common in making of both so called micro piles and large-diameter foundation piles.
  • An advantage of pile drilling is among other things the fact that drilled piles can be mounted quickly and accurately in a desired position, direction and depth. Straightness of the piles, verification of the bottom and accurate positioning are factors, thanks to which the pile drilling has often taken the place of pile driving particularly in demanding construction sites.
  • a drilled pile displaces a corresponding amount of soil to its volume by bringing up the drilled soil entirely. This is why not any horizontal strains will be caused that might brake surrounding structures, which may take place when piles are rammed.
  • Pile drilling is also relatively silent and quite shakeless (the operating frequency of the hammer is higher than the natural frequencies of soil and structures) when compared to piles being rammed.
  • the possibility offered by a drilled pile to get a casing pipe mounted reliably and without efforts even into a sloping rock surface, are superiority factors when comparing the method to piling by digging.
  • pile drilling is the most efficient piling method also by its production capacity and due to the fact that it enables piling with relatively small, easily transportable, and space-saving machines that can be put quickly into working order, also foundation constructors almost without exception take up a positive attitude towards the same.
  • Pile drilling uses pressurized air for operating the down-the-hole hammer and as the means for bringing up the loosened material. Careless use of air in flushing has brought about, however, some problems, solving of which is necessary for the standpoint of development regarding pile drilling.
  • the problems caused by the use of flushing air in down-the-hole hammer drilling are usually due to poor professional skill or carelessness of the operating personnel, but in practice also drill bit structures and drilling techniques may effect essentially to arising of the problems.
  • drill bits are originally designed usually for rock drilling, whereby the flushing air must first of all be directed as efficiently as possible to the drilled point for removing of the particles quickly in order to avoid multiple crushing, and on the other hand with such a volume (and speed), that the material gets brought up through the casing. This is why the flushing openings of the drill bits are thus aimed directly at the rock surface. During drilling the flushing air may get back upwards along unbroken walls of a rock hole.
  • flushing medium is required particularly in pile drilling, but correspondingly also in any other type of down-the-hole drilling, in which liquid, such as water is being used as flushing medium, so that the flushing medium is mainly returned back on the surface of the earth through the casing pipe, though the soil would be relatively loose.
  • the drilling action must be performed on the other hand in a space protected as well as possible so that the pressure of the ground does not block input openings of the flushing medium or in other words so that the pressure of the flushing medium to be fed exceeds the pressure of the ground and on the other hand so that the easiest way for flushing medium from the drilled point takes place in a desired manner back to the casing pipe.
  • the above solution enables extremely simple first drilling means or pilot regarding construction thereof particularly thanks to the fact that the flushing medium is both brought to the drilling surface and removed therefrom together with the drilling waste through a space between the pilot and the reamer, in which case a flushing flow is achieved that circulates very efficiently over the head of the pilot.
  • the drilling head with a guide surface arrangement that controls passage of the flushing medium, drifting of the flushing medium to the drilling surface can be secured by simultaneously preventing entering thereof a return flow channel prior to drifting thereof onto the drilling surface.
  • the invention enables thus also use of pressurized air as the flushing medium in a safe manner furthermore e.g. by providing the drilling head of the drilling unit, when needed, with a counterpart surface arrangement, which directs passage of the pressurized air flow so, that it may not get directed to the soil.
  • patent application publication WO 2010/084238 discloses a system for overburden drilling, having the characteristics defined in the preamble of the independent claim related to the present apparatus for down-the-hole drilling.
  • the drill bit being used in the system comprises an auxiliary flush assembly for introducing flushing medium from the first flushing means directly to the return flow channels.
  • feeding of an auxiliary flush flow through the auxiliary flush assembly at a return flow opening assembly of the return flow channels essentially to the drilling surface of the drilling device is not, however, made possible in order to avoid the problems related to the return flow openings from getting stuck or blocked.
  • US 2004/0251054 discloses a similar system.
  • auxiliary flush flow being led advantageously from a feed channel of the flushing medium at the center of a first frame part, comprising the first drilling means, by one or several auxiliary distribution channels toward the return flow opening assembly at a sharp angle with respect to a plane essentially parallel with the drilling surface/surfaces.
  • the return flow opening assembly is kept clear, thus efficiently preventing interruption of the return flow of the flushing medium along with the drilling waste.
  • the invention enables also use of pressurized air as the flushing medium in a safe way by making sure adequate functioning of the return flow of the flushing flow arrangement without a risk of the return flow openings getting stuck.
  • the invention relates to a method for down-the-hole drilling, the drilling being carried out by an apparatus, having a drilling device 1 that comprises a casing part 2 and an at least during a drilling situation essentially inside thereof existing drilling unit 3, at a drilling head of which there are at least first drilling means 4 for drilling a center hole, second drilling means 5 for reaming the center hole for the casing part 2 and a flushing flow arrangement 6 for leading of a flushing medium onto a drilling surface P and for returning of drilling waste at least partly internally inside the casing part 2.
  • the first drilling means 4 are coupled with the second drilling means 5 first of all power-transmittedly in order to carry out cooperation thereof at least during a drilling situation with the second drilling means 5 for a rotational motion w4, a feeding motion z4 and/or a hammering motion t4, and on the other hand removably in order to enable removal thereof from the hole.
  • the casing part 2 is arranged to be drawn into a hole to be drilled by the drilling unit 3 typically by means of a casing shoe 8.
  • flushing medium is being brought by first flushing means 6a of the flushing flow arrangement 6 onto the drilling surface P and returned from the drilling surface P together with the drilling waste by second flushing means 6b of the flushing flow arrangement 6 through axially directed s and in respect with each other separate feed flow and return flow channels 6a', 6b' that exist, when viewed in a cross section, between the first and second drilling means 4, 5 that is on an outer periphery of the first drilling means 4 and/or an inner periphery of the second drilling means 5.
  • return flow of flushing medium together with drilling waste through one or more return flow channels 6b' is made more efficient by introducing flushing medium directly from the first flushing means 6a by means of an auxiliary flush assembly 6c at a return flow opening assembly 6b'o of the return flow channel/channels 6b' essentially on the drilling surface P.
  • the drilling head of the drilling device 1 is formed of a first frame part 4a and a second frame part 5a, the drilling surfaces P; P1, P2 of which being provided with drilling organs of the first and the second drilling means 4, 5, such as an integrated drilling part, separate drilling pieces, bits or like.
  • a rotationally symmetrical reamer is being used as the second drilling means 5 that has an essentially continuing drilling surface radially, when viewed in a cross-section perpendicular to a longitudinal direction s of the drilling unit 3.
  • the flushing medium is being led from a flushing medium feed channel 6a1, being led centrically to the first drilling means 4, such as the first frame part 4a, by one or more distribution channels 6a2 directed outward therefrom into one or more feed flow channels 6a' on the outer periphery of the first drilling means 4, such as the first frame part 4a, at a distance e from the drilling surface P1 of the first drilling means. Furthermore passage of the flushing medium onto the drilling surface P is preferably guided e.g.
  • auxiliary flush flow ff is led from the flushing medium feed channel 6a1 by one or more auxiliary distribution channels 6c1, being directed radially outward therefrom, through an auxiliary flush opening assembly 6c2 into one or more, preferably each return flow channel/channels 6b'.
  • Direction of primary flushing medium feed flow is preferably altered e.g. according to figure 2 by a counterpart surface arrangement y essentially in connection with the drilling surface P particularly in order to decrease drifting thereof into the soil by decreasing its kinetic energy.
  • the auxiliary flush flow ff is being led toward the return flow opening assembly 6b'o essentially at a sharp angle AN with respect to a plane essentially parallel with the drilling surface/surfaces P; P1, P2.
  • the invention also relates to an apparatus for down-the-hole drilling applying the method described above that has a drilling device 1 comprising a casing part 2 and an at least during a drilling situation essentially inside thereof existing drilling unit 3, at a drilling head of which there are at least first drilling means 4 for drilling a center hole, second drilling means 5 for reaming the center hole for the casing part 2 and a flushing flow arrangement 6 for leading of a flushing medium onto a drilling surface P and for returning of drilling waste at least partly internally inside the casing part 2.
  • the first drilling means 4 are coupled with the second drilling means 5 first of all power-transmittedly in order to carry out cooperation thereof at least during a drilling situation with the second drilling means 5 for a rotational motion w4, a feeding motion z4 and/or a hammering motion t4, and on the other hand removably in order to enable removal thereof from the hole.
  • the casing part 2 is arranged to be drawn into a hole to be drilled by the drilling unit 3 typically by means of a casing shoe 8.
  • flushing flow arrangement 6 comprises axially directed s and in respect with each other separate feed flow and return flow channels 6a', 6b' both for bringing of the flushing medium onto the drilling surface P by means of the first flushing means 6a of the flushing flow arrangement 6 and returning thereof from the drilling surface P together with the drilling waste by means of second flushing means 6b of the flushing flow arrangement 6, the channels existing, when viewed in a cross-section, between the first and the second drilling means 3, 4 that is on an outer periphery of the first drilling means 4 and/or an inner periphery of the second drilling means 5.
  • the apparatus comprises an auxiliary flush assembly 6c for introducing flushing medium directly from the first flushing means 6a at a return flow opening assembly 6b'o of the return flow channel/channels 6b' essentially on the drilling surface P in order to make more efficient return flow of flushing medium together with drilling waste through the one or more return flow channels 6b'.
  • the drilling head of the drilling device 1 is formed of a first frame part 4a and a second frame part 5a, the drilling surfaces P; P1, P2 of which being provided with drilling organs of the first and the second drilling means 4, 5, such as an integrated drilling part, separate drilling pieces, bits or like.
  • a rotationally symmetrical reamer is being used as the second drilling means 5 that has an essentially continuing drilling surface radially, when viewed in a cross-section perpendicular to a longitudinal direction s of the drilling unit 3.
  • the first flushing means 6a of the flushing flow arrangement 6 comprise a flushing medium feed channel 6a1, being arranged centrically in the first drilling means 4, such as the first frame part 4a, and one or more distribution channels 6a2, being directed outward therefrom, in order to lead the flushing medium into the feed flow channel/channels 6a' on the outer periphery of the first drilling means 4, such as the first frame part 4a, at a distance e from the drilling surface P1 of the first drilling means.
  • the flushing flow arrangement 6 comprises preferably e.g.
  • the auxiliary flush assembly 6c comprises one or more auxiliary distribution channels 6c1, being directed radially outward from the flushing medium feed channel 6a1, in order to lead an auxiliary flush flow ff from the flushing medium feed channel 6a1 through an auxiliary flush opening assembly 6c2 into one or more, preferably each return flow channel/channels 6b'.
  • the flushing flow arrangement 6 comprises preferably e.g. according to figure 2 a counterpart surface arrangement y for altering direction of primary flushing medium feed flow essentially in connection with the drilling surface P particularly in order to decrease drifting thereof into the soil by decreasing its kinetic energy.
  • the one or more auxiliary distribution channels 6c1 are arranged at an essentially sharp angle AN with respect to a plane essentially parallel with the drilling surface/surfaces P; P1, P2 in order to lead the auxiliary flush flow ff toward the return flow opening assembly 6b'o.
  • the auxiliary flush assembly 6c comprises one or more auxiliary distribution channels 6c1 going through the first drilling means 4, such as the first frame part 4a, and ending at the auxiliary flush opening assembly 6c2, such as a hole at a bottom of one or more, preferably each return flow channel/channels 6b', at a distance ey from the drilling surface P1 of the first drilling means 4.
  • the diameter of the one or more auxiliary distribution channels 6c1 is essentially smaller than the diameter of the one or more primary flushing medium distribution channels 6a2. In most typical drillings the diameter is in most cases between 4-20 mm depending on the diameter of the drilling unit 3.
  • the first and second drilling means are coupled to work, so that most heterogeneous solutions can be exploited as the power transmission assemblies between the same starting from a screw joint locking.
  • the casing shoe can be placed in an integrated manner at the end of the casing part etc.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Claims (8)

  1. Verfahren für Abwärtslochbohrungen, wobei das Bohren durch eine Vorrichtung ausgeführt wird, die eine Bohreinrichtung (1) aufweist, die ein Verrohrungsteil (2) und eine wenigstens während einer Bohrsituation im Wesentlichen innerhalb davon vorhandene Bohreinheit (3), wobei bei einem Bohrkopf davon wenigstens erste Bohrmittel (4) zum Bohren eines Mittellochs, zweite Bohrmittel (5) zum Erweitern des Mittellochs für das Verrohrungsteil (2) und eine Spülflussanordnung (6) zum Führen eines Spülmediums an eine Bohrfläche (P) und zum Zurückleiten von Bohrabgang wenigstens teilweise im Inneren innerhalb des Verrohrungsteils (2) vorhanden sind, umfasst, wobei die ersten Bohrmittel (4) zuerst Leistung übertragend, um wenigstens während einer Bohrsituation ihr Zusammenwirken mit den zweiten Bohrmitteln (5) für eine Drehbewegung (w4), für eine Vorschubbewegung (z4) und/oder für eine Schlagbewegung (t4) auszuführen, und andererseits abnehmbar, um ihre Entnahme aus dem Loch zu ermöglichen, mit den zweiten Bohrmitteln (5) gekoppelt sind, wobei das Verrohrungsteil (2) dafür ausgelegt ist, durch die Bohreinheit (3) in ein zu bohrendes Loch gezogen zu werden, wobei das Spülmedium durch axial gerichtete (s) und in Bezug zueinander getrennte Zufluss- und Rückflusskanäle (6a', 6b'), die in einem Querschnitt gesehen zwischen den ersten und den zweiten Bohrmitteln (4, 5) an einem Außenumfang der ersten Bohrmittel (4) und/oder an einem Innenumfang der zweiten Bohrmittel (5) vorhanden sind, durch erste Spülmittel (6a) der Spülflussanordnung (6) an die Bohrfläche (P) gebracht wird und von der Bohrfläche (P) zusammen mit dem Bohrabgang durch zweite Spülmittel (6b) der Spülflussanordnung (6) zurückgeleitet wird, wobei das Spülmedium von einem zentralen Spülmedium-Zufuhrkanal (6a1) durch einen oder mehrere Verteilungskanäle (6a2), die davon in einer ersten Entfernung (e) von der Bohrfläche (P1) der ersten Bohrmittel in den einen oder die mehrere Zuflusskanäle (6a') an dem Außenumfang der ersten Bohrmittel (4) nach außen gerichtet sind, geleitet sind, und wobei das Spülmedium von den ersten Spülmitteln (6a) mittels einer Zusatzspülbaugruppe (6c) in den Rückflusskanal/in die Rückflusskanäle (6b') eingeleitet wird, um einen effizienteren Rückfluss des Spülmediums zusammen mit dem Bohrabgang durch den einen oder die mehreren Rückflusskanäle (6b') zu veranlassen, wobei ein Zusatzspülfluss (ff) von dem Spülmedium-Zufuhrkanal (6a1) durch einen oder mehrere Zusatzverteilungskanäle (6c1) bei einer Rückflussöffnungs-Anordnung (6b'o) des Rückflusskanals/der Rückflusskanäle (6b') in einer zweiten Entfernung (ey) von der Bohrfläche (P1) der ersten Bohrmittel (4) geleitet wird, gekennzeichnet dadurch, dass die zweite Entfernung (ey) kleiner als die erste Entfernung (e) ist.
  2. Verfahren nach Anspruch 1, beim Arbeiten mit einer Bohrvorrichtung, in der der Bohrkopf der Bohreinrichtung (1) aus einem ersten Rahmenteil (4a) und aus einem zweiten Rahmenteil (5a) gebildet ist, deren Bohrflächen (P; P1, P2) mit Bohrorganen der ersten und der zweiten Bohrmittel (4, 5), die einen integrierten Bohrteil, getrennte Bohrstücke, Bohrmeißel oder dergleichen umfassen, versehen sind, wobei als die zweiten Bohrmittel (5) ein rotationssymmetrischer Nachschneider verwendet wird, der in einem Querschnitt senkrecht zu einer Längsrichtung (s) der Bohreinheit (3) gesehen eine radial im Wesentlichen fortlaufende Bohrfläche aufweist, wobei das Spülmedium von dem zentralen Spülmedium-Zufuhrkanal (6a1) in dem ersten Rahmenteil (4a) über den einen oder die mehreren Verteilungskanäle (6a2) in den einen oder die mehreren Zuflusskanäle (6a') an dem Außenumfang des ersten Rahmenteils (4a) in der ersten Entfernung (e) von der Bohrfläche (P1) der ersten Bohrmittel geleitet wird, und wobei der Durchgang des Spülmediums an die Bohrfläche (P) durch eine bei dem Bohrkopf in Verbindung mit den ersten und/oder mit den zweiten Bohrmitteln (4, 5) vorhandene Führungsflächenanordnung (X) geführt wird, mittels deren das Zurückfließen des Spülmediumzuflusses von dem Zuflusskanal (6a') zu dem Rückflussraum (6b1) vor dessen Driften an die Bohrfläche (P) verhindert wird, dadurch gekennzeichnet, dass der eine oder die mehreren Zusatzverteilungskanäle (6c1) von dem Zufuhrkanal (6a1) radial nach außen gerichtet sind, wobei der Zusatzspülfluss (ff) durch eine Zusatzspülöffnungs-Anordnung (6c2) in den einen oder die mehreren Rückflusskanäle (6b') eingeleitet wird, wobei der Zusatzspülfluss (ff) unter einem spitzen Winkel (AN) in Bezug auf eine Ebene im Wesentlichen parallel zu der Bohrfläche/den Bohrflächen (P; P1, P2) in Richtung der Rückflussöffnungs-Anordnung (6b'o) geleitet ist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Richtung des primären Spülmediumzuflusses durch eine Gegenoberflächenanordnung (y) in Verbindung mit der Bohrfläche (P) geändert wird, insbesondere, um sein Driften in den Boden durch Verringern seiner kinetischen Energie zu verringern.
  4. Vorrichtung für Abwärtslochbohrungen, die eine Bohreinrichtung (1) aufweist, die ein Verrohrungsteil (2) und eine wenigstens während einer Bohrsituation im Wesentlichen innerhalb davon vorhandene Bohreinheit (3), wobei bei einem Bohrkopf davon wenigstens erste Bohrmittel (4) zum Bohren eines Mittellochs, zweite Bohrmittel (5) zum Erweitern des Mittellochs für das Verrohrungsteil (2) und eine Spülflussanordnung (6) zum Führen eines Spülmediums an eine Bohrfläche (P) und zum Zurückleiten von Bohrabgang wenigstens teilweise im Inneren innerhalb des Verrohrungsteils (2) vorhanden sind, umfasst, wobei die ersten Bohrmittel (4) zuerst Leistung übertragend, um wenigstens während einer Bohrsituation ihr Zusammenwirken mit den zweiten Bohrmitteln (5) für eine Drehbewegung (w4), für eine Vorschubbewegung (z4) und/oder für eine Schlagbewegung (t4) auszuführen, und andererseits abnehmbar, um ihre Entnahme aus dem Loch zu ermöglichen, mit den zweiten Bohrmitteln (5) gekoppelt sind, wobei das Verrohrungsteil (2) dafür ausgelegt ist, durch die Bohreinheit (3) in ein zu bohrendes Loch gezogen zu werden, wobei die Spülflussanordnung (6) axial gerichtete (s) und in Bezug zueinander getrennte Zufluss- und Rückflusskanäle (6a', 6b'), sowohl, um das Spülmedium mittels erster Spülmittel (6a) der Spülflussanordnung (6) an die Bohrfläche (P) zu bringen, als auch, um es von der Bohrfläche (P) zusammen mit dem Bohrabgang mittels zweiter Spülmittel (6b) der Spülflussanordnung (6) zurückzuleiten, umfasst, wobei die Kanäle in einem Querschnitt gesehen zwischen den ersten und den zweiten Bohrmitteln (3, 4) an einem Außenumfang der ersten Bohrmittel (4) und/oder einem Innenumfang der zweiten Bohrmittel (5) vorhanden sind, wobei das Spülmedium dafür ausgelegt ist, von einem zentralen Spülmedium-Zufuhrkanal (6a1) durch einen oder mehrere Verteilungskanäle (6a2), die davon in einer ersten Entfernung (e) von der Bohrfläche (P1) der ersten Bohrmittel in den einen oder die mehrere Zuflusskanäle (6a') an dem Außenumfang der ersten Bohrmittel (4) nach außen gerichtet sind, geleitet zu werden, und wobei die Vorrichtung eine Zusatzspülbaugruppe (6c) umfasst, um das Spülmedium von den ersten Spülmitteln (6a) in den Rückflusskanal/in die Rückflusskanäle (6b') einzuleiten, um einen effizienteren Rückfluss des Spülmediums zusammen mit dem Bohrabgang durch den einen oder die mehreren Rückflusskanäle (6b') zu veranlassen, wobei die Zusatzspülbaueinheit (6c) einen oder mehrere Zusatzverteilungskanäle (6c1) umfasst, um einen Zusatzspülfluss (ff) bei einer Rückflussöffnungs-Anordnung (6b'o) des Rückflusskanals/der Rückflusskanäle (6b') in einer zweiten Entfernung (ey) von der Bohrfläche (P1) der ersten Bohrmittel (4a1) zu leiten, gekennzeichnet dadurch, dass die zweite Entfernung (ey) kleiner als die erste Entfernung (e) ist.
  5. Vorrichtung nach Anspruch 4, in der der Bohrkopf der Bohreinrichtung (1) aus einem ersten Rahmenteil (4a) und aus einem zweiten Rahmenteil (5a) gebildet ist, deren Bohrflächen (P; P1, P2) mit Bohrorganen der ersten und der zweiten Bohrmittel (4, 5), die einen integrierten Bohrteil, getrennte Bohrstücke, Bohrmeißel oder dergleichen umfassen, versehen sind, wobei als die zweiten Bohrmittel (5) ein rotationssymmetrischer Nachschneider verwendet wird, der in einem Querschnitt senkrecht zu einer Längsrichtung (s) der Bohreinheit (3) gesehen eine radial im Wesentlichen fortlaufende Bohrfläche aufweist, wobei die ersten Spülmittel (6a) der Spülflussanordnung (6) den zentralen Spülmedium-Zufuhrkanal (6a1) und den einen oder die mehreren Verteilungskanäle (6a2) umfassen, um das Spülmedium in dem ersten Rahmenteil (4a) in den einen oder die mehreren Zuflusskanäle (6a') an dem Außenumfang des ersten Rahmenteils (4a) in der ersten Entfernung (e) von einer Bohrfläche (P1) der ersten Bohrmittel zu leiten, und wobei die Spülflussanordnung (6) eine Führungsflächenanordnung (X) umfasst, um den Durchgang des Spülmediums an die Bohrfläche (P) bei dem Bohrkopf der Bohreinheit (3) zu führen, wobei die Führungsflächenanordnung (X) das Zurückfließen des Spülmediumzuflusses von dem Zuflusskanal (6a') zu dem Rückflussraum (6b1) vor dessen Driften an die Bohrfläche (P) verhindert, dadurch gekennzeichnet, dass der eine oder die mehreren Zusatzverteilungskanäle (6c1) von dem Spülmedium-Zufuhrkanal (6a1) radial nach außen gerichtet sind, um den Zusatzspülfluss (ff) durch eine Zusatzspülöffnungs-Anordnung (6c2) unter einem spitzen Winkel (AN) in Bezug auf eine Ebene im Wesentlichen parallel zu der Bohrfläche/den Bohrflächen (P; P1, P2) in den einen oder die mehreren Rückflusskanäle (6b') einzuleiten, um den Zusatzspülfluss (ff) in Richtung der Rückflussöffnungs-Anordnung (6b'o) zu leiten.
  6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Spülflussanordnung (6) eine Gegenoberflächenanordnung (y) zum Ändern der Richtung des primären Spülmediumzuflusses in Verbindung mit der Bohrfläche (P), insbesondere, um durch Verringern seiner kinetischen Energie sein Driften in den Boden zu verringern, umfasst.
  7. Vorrichtung nach (einem der vorhergehenden Ansprüche) den Ansprüchen 5 oder 6, dadurch gekennzeichnet, dass die Zusatzspülbaugruppe (6c) einen oder mehrere Zusatzverteilungskanäle (6c1) umfasst, die durch ein erstes Rahmenteil (4a) der ersten Bohrmittel (4) gehen und bei einer Zusatzspülöffnungs-Anordnung (6c2), die ein Loch am Boden des Rückflusskanals/der Rückflusskanäle (6b') umfasst, enden.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche 4-7, dadurch gekennzeichnet, dass der Durchmesser des einen oder der mehreren Zusatzverteilungskanäle (6c1) wesentlich kleiner als der Durchmesser des einen oder der mehreren primären Spülmedium-Verteilungskanäle (6a2) ist.
EP12839207.3A 2012-07-12 2012-07-12 Verfahren und vorrichtung für abwärtslochbohrungen Active EP2675982B1 (de)

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SE421551B (sv) 1980-03-26 1982-01-04 Sandvik Ab Borrverktyg for rotations- och/eller slagborrning
FI95618C (fi) 1992-12-03 1998-09-03 Jorma Jaervelae Porauslaitteisto
FI20010699A0 (fi) * 2001-04-04 2001-04-04 Jorma Jaervelae Menetelmä poraukseen ja porauslaitteisto
US7182156B2 (en) * 2003-06-12 2007-02-27 Luc Charland System for overburden drilling
DE502005001190D1 (de) * 2005-06-10 2007-09-20 Geomechanik Wasser Und Umweltt Senkhammer-Bohrvorrichtung und -verfahren
DE102005026921A1 (de) * 2005-06-10 2006-12-21 Geomechanik Wasser- Und Umwelttechnik Gmbh Senkhammer-Bohrvorrichtung und -verfahren
FI20095046A0 (fi) 2009-01-21 2009-01-21 Atlas Copco Rotex Ab Oy Menetelmä ja laitteisto uppoporaukseen

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