EP1085166A1 - Auger drill - Google Patents

Auger drill Download PDF

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Publication number
EP1085166A1
EP1085166A1 EP00402300A EP00402300A EP1085166A1 EP 1085166 A1 EP1085166 A1 EP 1085166A1 EP 00402300 A EP00402300 A EP 00402300A EP 00402300 A EP00402300 A EP 00402300A EP 1085166 A1 EP1085166 A1 EP 1085166A1
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EP
European Patent Office
Prior art keywords
auger
casing
rotation
drill bit
drilling tool
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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.)
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Application number
EP00402300A
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German (de)
French (fr)
Inventor
Bertrand Steff De Verninac
Philippe Chagnot
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Compagnie du Sol SARL
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Compagnie du Sol SARL
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Publication date
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Publication of EP1085166A1 publication Critical patent/EP1085166A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/201—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes with helical conveying means

Definitions

  • the present invention relates to a drilling tool provided with a casing to make wells or excavations in the ground.
  • FIG 1 there is shown schematically a drilling tool equipped with its casing. More specifically, there is shown the vertical mast 10 of the tool on which is guided in vertical translation the head 12 for rotating the auger 14 via the vertical axis 16. There is also shown a casing 18 connected to the mast 10 by connection elements 20, allowing the depression of the casing 18 as the well 22 is drilled.
  • An object of the present invention is to provide a tool for drilling the auger type which includes a casing allowing to produce a displacement vertical of the ground extracted by the auger with respect to the casing equipping it.
  • the drilling tool comprising a drilling auger assembly, means for rotating the assembly forming an auger and casing surrounding over part of its length the auger assembly, is characterized in that said casing comprises on at at least part of its length means to limit the speed of rotation of the ground extracted by the auger assembly near the internal face of said casing relative to the speed of rotation of said auger assembly, whereby the rotation of the auger assembly allows the vertical movement of the ground extracted inside said casing.
  • the braking means are formed by an internal lining of the casing having a coefficient of high friction for the ground or by grooves on the internal face of the casing or more generally by any arrangement making it possible to slow down the rotation of the peripheral part of the extracted ground contained in the casing in relation to the speed of rotation of the auger itself, in particular by increasing the coefficient of friction of the internal face of the casing.
  • the subject of the invention is also various improvements made to the auger itself in relation to the casing according to the invention.
  • FIG. 2 we will describe the whole of a casing drilling tool according to the invention.
  • the auger assembly 30 which is constituted in the example considered by a upper auger 32 and by a lower auger 34.
  • the upper auger 32 is rotated by a hollow pin 36 cooperating with a rotation head 38.
  • the lower auger 34 is rotated by a pin 40 which is engaged in the hollow axis 36 of the upper auger.
  • the end of the axis 40 is driven in rotation by a head 42, the heads 38 and 42 being movable in translation on the mast not shown.
  • the cylindrical casing 44 which surrounds at least the upper auger 32.
  • This casing is integral with its upper end 44a of connection means not shown in detail 46 which allow the establishment of the casing 44 as the drilling progresses.
  • the internal face 50 of the casing 44 comprises means, preferably mechanical, which limit the speed of rotation of the part of the ground extracted by the auger and which is driven in rotation by it. These means are suitable for braking the terrain at inside the casing with respect to its peripheral zone.
  • a first embodiment of the braking means consist of a coating 52 produced on the face internal 50 of the casing using a material with a high coefficient of friction of the less compared to the ground extracted by the auger.
  • FIG 4 there is shown a second embodiment in which the internal face 50 of the casing 44 is provided with grooves such as 54 which have a suitable depth. These grooves extend over at least one part of the height of the casing 44.
  • FIG. 5 shows a third embodiment of the braking means. These consist of a helix hollowed out at its center 56 and which is integral with the internal wall 50 of the casing 44. This propeller which is fixed causes the desired braking effect when the auger 32 has a rotational movement.
  • the propeller 56 is not integral casing 44 but that it can be animated by a different rotational movement of the auger 32's rotational movement. This also gives an effect of braking of the periphery of the ground extracted by the auger.
  • the lower auger 44 has an external diameter D 2 which is at least equal to the external diameter D O of the casing 44. It is understood that this promotes the insertion of the casing into the borehole as and when it is made of it. On the other hand, it goes without saying that the diameter D 1 of the upper auger is less than the internal diameter of the casing 44.
  • the rotation heads 38 and 42 can be ordered in such a way that the lower auger 34 and the auger upper 32 are rotated in opposite directions.
  • the ground extracted by the lower auger 34 will be pumped laterally in the direction of the arrows F in the connection area between the two augers, that is to say at the lower end of the upper auger 32.
  • the end lower 32a of the upper auger 32 protrudes from the lower end 44b of the casing with a length L which preferably corresponds to one pitch of the propeller constituting the upper auger 32.

Abstract

Drilling tool with a drill bit assembly, means of rotating this assembly and a tube surrounding part of the length of the bit. Mounted over at least part of its length, the tube has means of limiting the speed of rotation of the extracted mud relative to the speed of rotation of the drill bit assembly so the rotation of the drill bit assembly allows the vertical displacement of the mud into the tube The means of limiting the relative speeds of rotation acts mechanically and comprises an internal coating on the tube to produce a friction coefficient, or a helix with the same axis as the drill bit, placed between the edge of the drill bit and the tube and fixed or driven in rotation in the opposite direction to that of the drill bit. Alternatively, the means of limiting the speed of rotation is roughnesses (protrusions) or grooves on the internal face of the tube. The drill bit assembly has a first upper drill bit whose lower end extends below the lower end of the tube by a length L and a second drill bit with the same axis as the first placed and below the first. The means of rotation are therefore a first means for the first drill bit and a second means for the second drill bit. The length L is at least one pitch of the helix of the first drill bit. The external diameter of the second drill bit is the same as that of the tube. The first and second means of rotation can drive them in opposite directions.

Description

La présente invention a pour objet un outil de forage muni d'un tubage pour réaliser des puits ou excavations dans le sol.The present invention relates to a drilling tool provided with a casing to make wells or excavations in the ground.

On sait que, lorsque l'on veut forer des puits dans le sol, on utilise le plus souvent un outil de forage constitué par une tarière. Lorsque la nature du sol dans laquelle on veut réaliser ce forage le nécessite, on équipe l'outil de forage d'un tubage qui est mis en place dans le forage au fur et à mesure de la progression de celui-ci. Le tubage est un tube cylindrique le plus souvent réalisé en acier. L'intérêt de la mise en place de ce tubage à l'intérieur du forage est de permettre de s'affranchir en cour de forage des inégalités et inhomogénéités du sol dans lequel celui-ci est pratiqué, et surtout de faciliter la réalisation par injection de béton ou de coulis, par exemple d'un pieu dans le puits ainsi obtenu.We know that when we want to drill wells in the ground, we use the more often a drilling tool consisting of an auger. When the nature of the soil in which we want to carry out this drilling requires it, we equip the drilling tool casing which is placed in the borehole as it progresses of it. The casing is a cylindrical tube most often made of steel. The advantage of installing this casing inside the borehole is that it allows overcoming the unevenness and inhomogeneities of the soil in the drilling area this is practiced, and above all to facilitate production by injecting concrete or of grout, for example of a pile in the well thus obtained.

Sur la figure 1, on a représenté schématiquement un outil de forage équipé de son tubage. Plus précisément, on a représenté le mât vertical 10 de l'outil sur lequel est guidée en translation verticale la tête 12 de mise en rotation de la tarière 14 par l'intermédiaire de l'axe vertical 16. On a représenté également un tubage 18 relié au mât 10 par des éléments de connexion 20, permettant l'enfoncement du tubage 18 au fur et à mesure du forage du puits 22.In Figure 1, there is shown schematically a drilling tool equipped with its casing. More specifically, there is shown the vertical mast 10 of the tool on which is guided in vertical translation the head 12 for rotating the auger 14 via the vertical axis 16. There is also shown a casing 18 connected to the mast 10 by connection elements 20, allowing the depression of the casing 18 as the well 22 is drilled.

Il s'avère, lorsque l'on utilise un tubage 18, qu'il n'est pas possible, à l'aide de la tarière 14, de provoquer le déplacement vertical relatif par rapport au sol 24 de la partie de celui-ci référencé 26 qui a été extrait ou foré par l'outil. En effet, cette portion du terrain est entraínée en rotation par la tarière, en même temps que celle-ci, ce qui ne produit donc aucun mouvement vertical relatif du terrain extrait 26 par rapport au sol 24.It turns out, when using a casing 18, that it is not possible to using the auger 14, to cause the relative vertical displacement relative to the soil 24 of the part thereof referenced 26 which has been extracted or drilled by the tool. In in fact, this portion of the ground is rotated by the auger, at the same time time, which therefore produces no relative vertical movement of the ground extracted 26 with respect to soil 24.

Or, il existe un certain nombre de situations dans lesquelles il est nécessaire d'utiliser le tubage et on souhaiterait pouvoir entraíner le déplacement relatif du sol extrait par la tarière par rapport au tubage, c'est-à-dire de permettre un mouvement de déplacement de ce terrain extrait par rapport au tubage. C'est notamment le cas lorsque l'on souhaite vider le tubage pendant la descente ou la remontée de l'ensemble constitué par la tarière et le tubage. C'est également le cas lorsque l'on veut pouvoir, dans le cas de forage dans des terrains durs, stocker les déblais dans le tubage et vider ceux-ci au-dessus d'une benne à la fin de l'opération de bétonnage du puits ainsi foré.However, there are a number of situations in which it is necessary to use the casing and we would like to be able to cause the displacement relative of the soil extracted by the auger with respect to the casing, i.e. to allow a movement of displacement of this extracted ground with respect to the casing. It is in particular the case when one wishes to empty the casing during the descent or the reassembly of the assembly constituted by the auger and the casing. This is also the case when you want to be able, in the case of drilling in hard ground, to store the cuttings in the casing and empty these over a bucket at the end of the operation concreting the well drilled.

Un objet de la présente invention est de fournir un outil de forage du type tarière qui comporte un tubage permettant de produire un déplacement vertical du terrain extrait par la tarière par rapport au tubage équipant celle-ci. An object of the present invention is to provide a tool for drilling the auger type which includes a casing allowing to produce a displacement vertical of the ground extracted by the auger with respect to the casing equipping it.

Pour atteindre ce but selon l'invention, l'outil de forage comportant un ensemble formant tarière de forage, des moyens de mise en rotation de l'ensemble formant tarière de forage et un tubage entourant sur une partie de sa longueur l'ensemble formant tarière, se caractérise en ce que ledit tubage comprend sur au moins une partie de sa longueur des moyens pour limiter la vitesse de rotation du terrain extrait par l'ensemble formant tarière à proximité de la face interne dudit tubage par rapport à la vitesse de rotation dudit ensemble formant tarière, par quoi la rotation de l'ensemble formant tarière permet le déplacement vertical du terrain extrait à l'intérieur dudit tubage.To achieve this object according to the invention, the drilling tool comprising a drilling auger assembly, means for rotating the assembly forming an auger and casing surrounding over part of its length the auger assembly, is characterized in that said casing comprises on at at least part of its length means to limit the speed of rotation of the ground extracted by the auger assembly near the internal face of said casing relative to the speed of rotation of said auger assembly, whereby the rotation of the auger assembly allows the vertical movement of the ground extracted inside said casing.

On comprend que, grâce à la présence de préférence sur la face interne du tubage, des moyens de limitation de vitesse de rotation du terrain extrait à proximité de la face interne du tubage, c'est-à-dire dans sa partie périphérique, la rotation de la vis que constitue la tarière provoque par rapport au tubage un déplacement en translation du terrain extrait dans le sens imposé par le sens de rotation de la tarière.We understand that, thanks to the presence preferably on the internal face casing, means for limiting the speed of rotation of the ground extracted at proximity of the internal face of the casing, that is to say in its peripheral part, the rotation of the screw that constitutes the auger causes relative to the casing a translational displacement of the extracted ground in the direction imposed by the direction of auger rotation.

Selon un mode préféré de mise en oeuvre, les moyens de freinage sont constitués par un revêtement interne du tubage présentant un coefficient de frottement élevé pour le terrain ou par des cannelures sur la face interne du tubage ou plus généralement par toute disposition permettant de freiner la rotation de la partie périphérique du terrain extrait contenu dans le tubage par rapport à la vitesse de rotation de la tarière elle-même, notamment par augmentation du coefficient de frottement de la face interne du tubage.According to a preferred embodiment, the braking means are formed by an internal lining of the casing having a coefficient of high friction for the ground or by grooves on the internal face of the casing or more generally by any arrangement making it possible to slow down the rotation of the peripheral part of the extracted ground contained in the casing in relation to the speed of rotation of the auger itself, in particular by increasing the coefficient of friction of the internal face of the casing.

L'invention a également pour objet divers perfectionnements apportés à la tarière elle-même en relation avec le tubage selon l'invention.The subject of the invention is also various improvements made to the auger itself in relation to the casing according to the invention.

D'autres caractéristiques et avantages de l'invention apparaítront mieux à la lecture de la description qui suit de plusieurs modes de réalisation de l'invention donnés à titre d'exemples non limitatifs. La description se réfère aux figures annexées sur lesquelles :

  • la figure 1, déjà décrite, montre un outil de forage équipé d'un tubage selon l'état de la technique ;
  • la figure 2 montre en coupe verticale l'ensemble de l'outil de forage muni de son tubage ;
  • la figure 3 est une vue en coupe horizontale du tubage montrant un premier mode de réalisation de l'invention ;
  • la figure 4 est une vue en coupe horizontale du tubage montrant un deuxième mode de réalisation de l'invention ; et
  • la figure 5 est une vue en coupe partielle verticale de l'outil équipé de son tubage montrant un troisième mode de réalisation de l'invention
    • Other characteristics and advantages of the invention will appear better on reading the following description of several embodiments of the invention given by way of non-limiting examples. The description refers to the appended figures in which:
  • FIG. 1, already described, shows a drilling tool fitted with casing according to the state of the art;
  • Figure 2 shows in vertical section the entire drilling tool provided with its casing;
  • Figure 3 is a horizontal sectional view of the tubing showing a first embodiment of the invention;
  • Figure 4 is a horizontal sectional view of the tubing showing a second embodiment of the invention; and
  • Figure 5 is a partial vertical sectional view of the tool equipped with its casing showing a third embodiment of the invention

    • En se référent maintenant à la figure 2, on va décrire l'ensemble d'un outil de forage à tubage conforme à l'invention. Sur cette figure, on a représenté l'ensemble formant tarière 30 qui est constitué dans l'exemple considéré par une tarière supérieure 32 et par une tarière inférieure 34. La tarière supérieure 32 est mise en rotation par un axe creux 36 coopérant avec une tête de mise en rotation 38. La tarière inférieure 34 est mise en rotation par un axe 40 qui est engagé dans l'axe creux 36 de la tarière supérieure. L'extrémité de l'axe 40 est entraínée en rotation par une tête 42, les têtes 38 et 42 étant mobiles en translation sur le mât non représenté.Referring now to FIG. 2, we will describe the whole of a casing drilling tool according to the invention. In this figure, we have represented the auger assembly 30 which is constituted in the example considered by a upper auger 32 and by a lower auger 34. The upper auger 32 is rotated by a hollow pin 36 cooperating with a rotation head 38. The lower auger 34 is rotated by a pin 40 which is engaged in the hollow axis 36 of the upper auger. The end of the axis 40 is driven in rotation by a head 42, the heads 38 and 42 being movable in translation on the mast not shown.

    Sur cette figure, on a également fait apparaítre le tubage cylindrique 44 qui entoure au moins la tarière supérieure 32. Ce tubage est solidaire à son extrémité supérieure 44a de moyens de connexion non représentés en détail 46 qui permettent la mise en place du tubage 44 au fur et à mesure du forage. Selon une caractéristique essentielle de l'invention, la face interne 50 du tubage 44 comporte des moyens, de préférence à action mécanique, qui permettent de limiter la vitesse de rotation de la partie du terrain extrait par la tarière et qui est entraínée en rotation par celle-ci. Ces moyens sont aptes à réaliser un freinage du terrain à l'intérieur du tubage en ce qui concerne sa zone périphérique. Comme on l'a déjà expliqué du fait du freinage de la partie périphérique du terrain entourant la tarière 32, la rotation de cette tarière permet effectivement de provoquer le déplacement en translation verticale par rapport au tubage de ce terrain selon une direction qui est imposée par le sens de rotation de la tarière.In this figure, we have also shown the cylindrical casing 44 which surrounds at least the upper auger 32. This casing is integral with its upper end 44a of connection means not shown in detail 46 which allow the establishment of the casing 44 as the drilling progresses. According to one essential characteristic of the invention, the internal face 50 of the casing 44 comprises means, preferably mechanical, which limit the speed of rotation of the part of the ground extracted by the auger and which is driven in rotation by it. These means are suitable for braking the terrain at inside the casing with respect to its peripheral zone. As we already have explained due to the braking of the peripheral part of the ground surrounding the auger 32, the rotation of this auger effectively makes it possible to cause the displacement in vertical translation relative to the casing of this land in a direction which is imposed by the direction of rotation of the auger.

    Sur la figure 3, on a représenté un premier mode de réalisation des moyens de freinage. Ils sont constitués par un revêtement 52 réalisé sur la face interne 50 du tubage à l'aide d'un matériau à fort coefficient de frottement du moins par rapport au terrain extrait par la tarière.In Figure 3, a first embodiment of the braking means. They consist of a coating 52 produced on the face internal 50 of the casing using a material with a high coefficient of friction of the less compared to the ground extracted by the auger.

    Sur la figure 4, on a représenté un deuxième mode de mise en oeuvre dans lequel la face interne 50 du tubage 44 est munie de cannelures telles que 54 qui ont une profondeur convenable. Ces cannelures s'étendent sur au moins une partie de la hauteur du tubage 44.In Figure 4, there is shown a second embodiment in which the internal face 50 of the casing 44 is provided with grooves such as 54 which have a suitable depth. These grooves extend over at least one part of the height of the casing 44.

    Sur la figure 5, on a représenté un troisième mode de réalisation des moyens de freinage. Ceux-ci sont constitués par une hélice évidée en son centre 56 et qui est solidaire de la paroi interne 50 du tubage 44. Cette hélice qui est fixe provoque l'effet de freinage souhaité lorsque la tarière 32 est animée d'un mouvement de rotation.FIG. 5 shows a third embodiment of the braking means. These consist of a helix hollowed out at its center 56 and which is integral with the internal wall 50 of the casing 44. This propeller which is fixed causes the desired braking effect when the auger 32 has a rotational movement.

    En variante, on pourrait envisager que l'hélice 56 ne soit pas solidaire du tubage 44 mais qu'elle puisse être animée d'un mouvement de rotation différent du mouvement de rotation de la tarière 32. On obtient ainsi également un effet de freinage de la périphérie du terrain extrait par la tarière.Alternatively, one could envisage that the propeller 56 is not integral casing 44 but that it can be animated by a different rotational movement of the auger 32's rotational movement. This also gives an effect of braking of the periphery of the ground extracted by the auger.

    En se référent maintenant à nouveau à la figure 2, on va décrire des caractéristiques préférées de la tarière utilisée en liaison avec le tubage 44 conforme à l'invention. De préférence, la tarière inférieure 44 présente un diamètre externe D2 qui est au moins égal au diamètre externe DO du tubage 44. On comprend qu'ainsi on favorise l'enfoncement du tubage dans le forage au fur et à mesure de la réalisation de celui-ci. En revanche, il va de soi que le diamètre D1 de la tarière supérieure est inférieur au diamètre interne du tubage 44.Referring now again to Figure 2, we will describe preferred features of the auger used in connection with the casing 44 according to the invention. Preferably, the lower auger 44 has an external diameter D 2 which is at least equal to the external diameter D O of the casing 44. It is understood that this promotes the insertion of the casing into the borehole as and when it is made of it. On the other hand, it goes without saying that the diameter D 1 of the upper auger is less than the internal diameter of the casing 44.

    De préférence également, les têtes de mise en rotation 38 et 42 peuvent être commandées de telle manière que la tarière inférieure 34 et la tarière supérieure 32 soient animées de mouvements de rotation en sens inverse. On comprend que si la tarière inférieure 34 est animée d'un mouvement de rotation de vissage dans le sol, et si la tarière supérieure 32 est animée d'un mouvement de rotation de dévissage dans le sol, le terrain extrait par la tarière inférieure 34 sera refoulé latéralement selon le sens des flèches F dans la zone de raccordement entre les deux tarières, c'est-à-dire à l'extrémité inférieure de la tarière supérieure 32. Pour permettre la réalisation de ce phénomène, de préférence, l'extrémité inférieure 32a de la tarière supérieure 32 fait saillie hors de l'extrémité inférieure 44b du tubage d'une longueur L qui correspond, de préférence, à un pas de l'hélice constituant la tarière supérieure 32. Ainsi on peut obtenir l'éjection latérale effective du terrain extrait. Cette procédure permet de compacter et de renforcer, lorsque cela est nécessaire, la paroi du forage avant la mise en place du tubage dans la zone correspondante.Also preferably, the rotation heads 38 and 42 can be ordered in such a way that the lower auger 34 and the auger upper 32 are rotated in opposite directions. We understands that if the lower auger 34 is rotated by screwing into the ground, and if the upper auger 32 is driven by a movement of unscrewing rotation in the ground, the ground extracted by the lower auger 34 will be pumped laterally in the direction of the arrows F in the connection area between the two augers, that is to say at the lower end of the upper auger 32. To allow the realization of this phenomenon, preferably, the end lower 32a of the upper auger 32 protrudes from the lower end 44b of the casing with a length L which preferably corresponds to one pitch of the propeller constituting the upper auger 32. Thus one can obtain lateral ejection effective of the extracted land. This procedure makes it possible to compact and strengthen, when necessary, the wall of the borehole before installing the casing in the corresponding area.

    Claims (10)

    Outil de forage comportant un ensemble formant tarière de forage, des moyens de mise en rotation de l'ensemble formant tarière de forage et un tubage entourant sur une partie de sa longueur l'ensemble formant tarière, caractérisé en ce que ledit tubage comprend sur au moins une partie de sa longueur des moyens pour limiter la vitesse de rotation du terrain extrait par l'ensemble formant tarière à proximité de la face interne dudit tubage par rapport à la vitesse de rotation dudit ensemble formant tarière, par quoi la rotation de l'ensemble formant tarière permet le déplacement vertical du terrain extrait à l'intérieur dudit tubage.Drilling tool comprising a drill auger assembly, means for rotating the drilling auger assembly and a casing surrounding the auger assembly over part of its length, characterized in that said casing comprises over at least part of its length means to limit the speed of rotation of the ground extracted by the assembly forming an auger near the internal face of said casing with respect to the speed of rotation of said auger assembly, whereby the rotation of the assembly forming an auger allows the vertical displacement of the ground extracted inside said casing. Outil de forage selon la revendication 1, caractérisé en ce que lesdits moyens de limitation de la vitesse de rotation agissent mécaniquement.Drilling tool according to claim 1, characterized in that said means for limiting the speed of rotation act mechanically. Outil de forage selon la revendication 2, caractérisé en ce que lesdits moyens de limitation de la vitesse consistent en un revêtement interne dudit tubage apte à produire un coefficient de frottement.Drilling tool according to claim 2, characterized in that said speed limiting means consist of an internal coating of said casing capable of producing a coefficient of friction. Outil de forage selon la revendication 2, caractérisé en ce que lesdits moyens de limitation de la vitesse comprennent une hélice ayant le même axe que l'ensemble formant tarière, disposée entre la périphérie de l'ensemble formant tarière et ledit tubage, et fixé ou entraínée en rotation dans le sens inverse du sens de rotation de l'ensemble formant tarière.Drilling tool according to claim 2, characterized in that said speed limitation means comprises a propeller having the same axis that the auger assembly, disposed between the periphery of the assembly forming an auger and said casing, and fixed or rotated in the opposite direction the direction of rotation of the auger assembly. Outil de forage selon la revendication 2, caractérisé en ce que les moyens de limitation de la vitesse comprennent des aspérités sur la face interne dudit tubage.Drilling tool according to claim 2, characterized in that the speed limitation means include roughness on the inner face of said casing. Outil de forage selon la revendication 2, caractérisé en ce que lesdits moyens de limitation de vitesse comprennent des cannelures réalisées sur la face interne dudit tubage.Drilling tool according to claim 2, characterized in that said speed limitation means comprise grooves made on the internal face of said casing. Outil de forage selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit ensemble formant tarière comprend une première tarière supérieure dont l'extrémité inférieure est disposée en dessous de l'extrémité inférieure dudit tubage d'une longueur L et une deuxième tarière, de même axe que la première et disposée en dessous de la première, et en ce que les moyens de mise en rotation comprennent des premiers moyens de mise en rotation de la première tarière et des deuxièmes moyens de mise en rotation de la deuxième tarière. Drilling tool according to any one of Claims 1 to 6, characterized in that said auger assembly includes a first auger upper whose lower end is arranged below the end lower of said casing with a length L and a second auger, of the same axis than the first and arranged below the first, and in that the means of rotation include first means for rotating the first auger and second means for rotating the second auger. Outil de forage selon la revendication 7, caractérisé en ce que ladite longueur L est au moins égale à un pas de l'hélice formée par la première tarière.Drilling tool according to claim 7, characterized in that said length L is at least equal to one pitch of the propeller formed by the first auger. Outil de forage selon l'une quelconque des revendications 7 et 8, caractérisé en ce que le diamètre externe de la deuxième tarière est sensiblement égal au diamètre externe du tubage.Drilling tool according to any one of Claims 7 and 8, characterized in that the external diameter of the second auger is substantially equal to the outer diameter of the casing. Outil de forage selon l'une quelconque des revendications 7 à 9, caractérisé en ce que lesdits premiers et deuxièmes moyens de mise en rotation des première et deuxième tarières sont aptes à provoquer la rotation des deux tarières dans des sens opposés.Drilling tool according to any one of Claims 7 to 9, characterized in that said first and second means for rotating first and second augers are capable of causing the rotation of the two augers in opposite directions.
    EP00402300A 1999-09-15 2000-08-17 Auger drill Withdrawn EP1085166A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9911505A FR2798420B1 (en) 1999-09-15 1999-09-15 DRILLING TOOL WITH TUBING
    FR9911505 1999-09-15

    Publications (1)

    Publication Number Publication Date
    EP1085166A1 true EP1085166A1 (en) 2001-03-21

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    ID=9549846

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00402300A Withdrawn EP1085166A1 (en) 1999-09-15 2000-08-17 Auger drill

    Country Status (2)

    Country Link
    EP (1) EP1085166A1 (en)
    FR (1) FR2798420B1 (en)

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1905945A1 (en) * 2006-09-22 2008-04-02 BAUER Maschinen GmbH Auger for drilling an earth borehole
    EP2011958A1 (en) * 2007-07-06 2009-01-07 BAUER Maschinen GmbH Auger
    EP2339107A3 (en) * 2009-12-22 2011-08-17 Fredi Stury Drilling device with telescopic auger, adapter piece and drilling method for drilling

    Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0311363A2 (en) * 1987-10-05 1989-04-12 Kawasaki Steel Corporation Hollow steel pile, manufacturing method and pile driving method
    EP0699823A1 (en) * 1993-05-14 1996-03-06 Kabushiki Kaisha Komatsu Seisakusho Earth dumping control device for a small diameter pipe propelling machine

    Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0311363A2 (en) * 1987-10-05 1989-04-12 Kawasaki Steel Corporation Hollow steel pile, manufacturing method and pile driving method
    EP0699823A1 (en) * 1993-05-14 1996-03-06 Kabushiki Kaisha Komatsu Seisakusho Earth dumping control device for a small diameter pipe propelling machine

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1905945A1 (en) * 2006-09-22 2008-04-02 BAUER Maschinen GmbH Auger for drilling an earth borehole
    EP2011958A1 (en) * 2007-07-06 2009-01-07 BAUER Maschinen GmbH Auger
    EP2339107A3 (en) * 2009-12-22 2011-08-17 Fredi Stury Drilling device with telescopic auger, adapter piece and drilling method for drilling

    Also Published As

    Publication number Publication date
    FR2798420A1 (en) 2001-03-16
    FR2798420B1 (en) 2001-12-14

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