EP2675982B1 - Procédé et appareil de forage en fond de trou - Google Patents

Procédé et appareil de forage en fond de trou Download PDF

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Publication number
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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European Patent Office
Prior art keywords
drilling
flushing
flow
channels
flushing medium
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EP12839207.3A
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German (de)
English (en)
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EP2675982A1 (fr
EP2675982A4 (fr
Inventor
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position, in which it is positioned sidewards in front of the mantle pipe, and a return position, in which it is withdrawn in radial direction inside the mantle pipe.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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  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
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Claims (8)

  1. Procédé de forage en fond-de-trou, ce forage étant effectué par un appareil doté d'un dispositif de forage (1) comprenant un boîtier (2) et une unité de forage à l'intérieur (3), une tête de forage comportant un premier dispositif de forage (4) pour le forage d'un trou central, un deuxième dispositif de forage (5) pour aléser le trou central du boîtier (2) et un dispositif de flux de rinçage (6) pour l'acheminement d'un liquide de rinçage sur la surface de forage (P) et le retour des résidus de forage au moins en partie à l'intérieur du boîtier (2), où le premier dispositif de forage (4) est couplé avec le deuxième dispositif de forage (5) d'abord par le biais d'une transmission d'énergie afin d'assurer une coopération au moins lors d'une situation de forage avec le deuxième dispositif de forage (5) pour un mouvement rotatif (w4), un mouvement d'alimentation (z4) et/ou un mouvement de martelage (t4), et d'un autre côté par le biais d'un dispositif amovible afin d'assurer le retrait d'un trou, le boîtier (2) étant disposé de manière à être entrainé dans un trou à forer par l'unité de forage (3), le liquide de rinçage étant d'abord acheminé par un système de rinçage (6a) sur le dispositif de flux de rinçage (6) jusque sur la surface de forage (P) et ramené à partir de la surface de forage (P) avec les résidus de forage par un deuxième dispositif de rinçage (6b) du dispositif de flux de rinçage (6) par le biais d'un axe (s) et par rapport à chaque autre canal d'alimentation et de retour respectifs (6a', 6b'), dans une vue transversale, entre le premier et le deuxième dispositif de forage (4, 5), à l'extérieur du premier dispositif de forage (4) et/ou à l'intérieur du deuxième dispositif de forage (5), le liquide de rinçage étant acheminé depuis un dispositif d'alimentation du liquide de rinçage centrique (6a1) par au moins un canal de distribution (6a2) dirigé vers l'extérieur dans au moins un canal d'alimentation (6a') à l'extérieur du premier dispositif de forage (4) à une première distance (e) de la surface de forage (P1) du premier dispositif de forage, afin d'améliorer l'efficacité du flux de retour du liquide de rinçage avec les résidus de rinçage à travers au moins un canal de flux de retour (6b'), le liquide de rinçage étant introduit à partir du premier système de rinçage (6a) par le biais d'un assemblage de rinçage auxiliaire (6c) vers le(s) canal (aux) de flux de retour (6b'), un flux de rinçage auxiliaire (ff) étant acheminé hors d'un canal d'alimentation de liquide de rinçage (6a1) par au moins un canal de distribution auxiliaire (6c1) au niveau d'un assemblage d'ouverture de flux de retour (6b'o) du/des canal/aux de flux de retour (6b') à une deuxième distance (ey) de la surface de forage (P1) du premier dispositif de forage (4), caractérisé par le fait que cette deuxième distance (ey) est plus courte que la première distance (e).
  2. Procédé conformément à la revendication 1 pour l'exploitation d'un dispositif de forage, la tête de forage du dispositif de forage (1) étant formée d'un premier cadre (4a) et d'un deuxième cadre (5a), dont les surfaces de forage (P, P1, P2) sont fournies avec des pièces de forage appartenant au premier et au deuxième dispositifs de forage (4, 5) comprenant une pièce de forage intégrée, des pièces de forage séparées, des accessoires et assimilés, une pièce d'alésage symétrique rotative servant de deuxième dispositif de forage (5) comportant une surface radiale de forage continu, considérée dans une vue transversale et perpendiculaire à une direction longitudinale (s) de l'unité de forage (3), le liquide de rinçage étant acheminé depuis le canal centrique d'alimentation du liquide de rinçage (6a1) dans le premier cadre (4a) à travers au moins un canal de distribution (6a2) jusqu'à au moins un canal de flux d'alimentation (6a') à l'extérieur du premier cadre (4a) à la première distance (e) de la surface de forage (P1) du premier dispositif de forage, le passage du liquide de rinçage dans la surface de forage (P) étant guidé par un dispositif de surface (X) existant au niveau de la tête de forage en rapport avec le premier et/ou le deuxième dispositif de forage (4, 5), et par lequel le retour du flux d'alimentation du liquide de rinçage à partir du canal de flux d'alimentation (6a') vers l'espace de flux de retour (6b1) est empêché avant la dérive vers la surface de forage (P), caractérisé par l'orientation radiale d'au moins un canal de distribution auxiliaire (6c1) vers l'extérieur à partir du canal d'alimentation (6a1), le flux de rinçage auxiliaire (ff) étant introduit à travers un assemblage de rinçage auxiliaire (6c2) dans au moins un canal de flux de retour (6b'), le flux de rinçage auxiliaire (ff) étant mené vers l'assemblage d'ouverture de flux de retour (6b'o) à un angle aigu (AN) par rapport à un plan essentiellement parallèle à la/aux surface(s) de forage (P, P1, P2).
  3. Procédé conformément à la revendication 1 ou 2, caractérisé par l'altération de l'orientation du liquide de rinçage principal par un dispositif de surface équivalent (y) en rapport avec la surface de forage (P), particulièrement afin de réduire la dérive dans la terre en réduisant l'énergie cinétique.
  4. Appareil de forage en fond-de-trou doté d'un dispositif de forage (1) comprenant un boîtier (2) et une unité de forage à l'intérieur (3), une tête de forage comportant un premier dispositif de forage (4) pour le forage d'un trou central, un deuxième dispositif de forage (5) pour aléser le trou central du boîtier (2) et un dispositif de flux de rinçage (6) pour l'acheminement d'un liquide de rinçage sur la surface de forage (P) et le retour des résidus de forage au moins en partie à l'intérieur du boîtier (2), où le premier dispositif de forage (4) est couplé avec le deuxième dispositif de forage (5) d'abord par le biais d'une transmission d'énergie afin d'assurer une coopération au moins lors d'une situation de forage avec le deuxième dispositif de forage (5) pour un mouvement rotatif (w4), un mouvement d'alimentation (z4) et/ou un mouvement de martelage (t4), et d'un autre côté par le biais d'un dispositif amovible afin d'assurer le retrait d'un trou, le boîtier (2) étant disposé de manière à être entrainé dans un trou à forer par l'unité de forage (3), le dispositif de flux de rinçage (6) comprenant un flux d'alimentation et des canaux de flux de retour (6a', 6b') séparés et orientés axialement (s), à la fois pour l'acheminement du système de liquide de rinçage (6) sur la surface de forage (P) par le biais du premier système de rinçage (6a) et le retour à partir de la surface de forage (P) avec les résidus de forage par le biais d'un deuxième système de rinçage (6b) du dispositif de flux de rinçage (6), les canaux existant, vus en vue transversale, entre le premier et le deuxième dispositif de forage (3, 4) à l'extérieur du premier dispositif de forage (4) et/ou à l'intérieur du deuxième périphérique de forage (5), le liquide de rinçage étant disposé afin d'être acheminé depuis un canal centrique d'alimentation de liquide de rinçage (6a1) par au moins un canal de distribution (6a2) dirigé vers l'extérieur dans au moins un canal d'alimentation (6a') à l'extérieur du premier dispositif de forage (4) à une première distance (e) de la surface de forage (P1) du premier dispositif de forage, afin d'améliorer l'efficacité du flux de retour du liquide de rinçage avec les résidus de rinçage à travers au moins un canal de flux de retour (6b'), l'appareil comprenant un assemblage de rinçage auxiliaire (6c) le liquide de rinçage étant introduit à partir du premier système de rinçage (6a) vers le(s) canal(aux) de flux de retour (6b'), avec un assemblage de rinçage auxiliaire (6c) comprenant au moins un canal de distribution auxiliaire (6c1) pour l'orientation d'un flux de rinçage auxiliaire (ff) au niveau d'un assemblage de flux de retour (6b'o) du/des canal/aux de flux de retour (6b') à une deuxième distance (ey) de la surface de forage (P1) du premier dispositif de forage (4a1), caractérisé par le fait que cette deuxième distance (ey) est plus courte que la première distance (e).
  5. Appareil conformément à la revendication 4, la tête de forage du dispositif de forage (1) étant formée d'un premier cadre (4a) et d'un deuxième cadre (5a), dont les surfaces de forage (P, P1, P2) sont fournies avec des pièces de forage appartenant au premier et au deuxième dispositifs de forage (4, 5) comprenant une pièce de forage intégrée, des pièces de forage séparées, des accessoires et assimilés, une pièce d'alésage symétrique rotative servant de deuxième dispositif de forage (5) comportant une surface radiale de forage continu, considérée dans une vue transversale et perpendiculaire à une direction longitudinale (s) de l'unité de forage (3), le premier système de rinçage (6a) du dispositif de flux de rinçage (6) comprenant le canal centrique d'alimentation du liquide de rinçage (6a1) à travers au moins un canal de distribution (6a2), afin d'acheminer le liquide de rinçage dans le premier cadre (4a) jusqu'à au moins un canal de flux d'alimentation (6a') à l'extérieur du premier cadre (4a) à la première distance (e) de la surface de forage (P1) du premier dispositif de forage, le système de flux de rinçage (6) étant guidé par un dispositif de surface (X) pour l'orientation du liquide coulant sur une surface de forage (P) au niveau de la tête de forage d'une unité de forage (3), le système de guidage en surface (X) empêchant le retour du flux d'alimentation de liquide de rinçage à partir du canal de flux d'alimentation (6a') vers un espace de flux de retour (6b1) avant la dérive vers la surface de forage (P), caractérisé par l'orientation radiale d'au moins un canal de distribution auxiliaire (6c1) vers l'extérieur à partir du canal d'alimentation (6a1), le flux de rinçage auxiliaire (ff) étant introduit à travers un assemblage de rinçage auxiliaire (6c2) dans au moins un canal de flux de retour (6b'), le flux de rinçage auxiliaire (ff) étant mené vers l'assemblage d'ouverture de flux de retour (6b') à un angle aigu (AN) par rapport à un plan essentiellement parallèle à la/aux surface(s) de forage (P, P1, P2) afin de mener le flux de rinçage auxiliaire (ff) vers l'assemblage d'ouverture de flux de retour (6b'o).
  6. Appareil conformément à la revendication 4 ou 5, caractérisé par le système de flux de rinçage (6) comprenant un système de surface équivalent (y) pour l'altération de la direction du flux d'alimentation du liquide de rinçage principal en rapport avec la surface de forage (P), particulièrement afin de réduire la dérive dans la terre en réduisant l'énergie cinétique.
  7. Appareil conformément à 5 ou 6, caractérisé par le système de rinçage auxiliaire (6c) comprenant au moins un canal de distribution auxiliaire (6c1) traversant un premier cadre (4a) du premier dispositif de forage (4) et se terminant par un système d'ouverture de rinçage auxiliaire (6c2) comprenant un trou au fond du/des canal (aux) de flux de retour (6b').
  8. Appareil conformément à n'importe laquelle des revendications précédentes 4-7, caractérisé par un diamètre d'au moins un canal de distribution auxiliaire (6c1) essentiellement plus petit que le diamètre de l'un des canaux moyens principaux de distribution de liquide de rinçage (6a2).
EP12839207.3A 2012-07-12 2012-07-12 Procédé et appareil de forage en fond de trou Active EP2675982B1 (fr)

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PCT/FI2012/050729 WO2013156667A1 (fr) 2012-07-12 2012-07-12 Procédé et appareil de forage en fond de trou

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EP2675982B1 true EP2675982B1 (fr) 2018-05-09

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Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
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
CA2432246C (fr) * 2003-06-12 2009-07-28 Luc Charland Systeme pour forage de terrains de couverture
DE102005026921A1 (de) * 2005-06-10 2006-12-21 Geomechanik Wasser- Und Umwelttechnik Gmbh Senkhammer-Bohrvorrichtung und -verfahren
ATE369481T1 (de) * 2005-06-10 2007-08-15 Geomechanik Wasser Und Umweltt 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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WO2013156667A1 (fr) 2013-10-24
EP2675982A4 (fr) 2015-12-30

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