EP0169110B1 - Bohrwerkzeuge mit Wasserdurchlässen zur Erzielung einer hohen Reinigungswirkung der Angriffsfläche - Google Patents

Bohrwerkzeuge mit Wasserdurchlässen zur Erzielung einer hohen Reinigungswirkung der Angriffsfläche Download PDF

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Publication number
EP0169110B1
EP0169110B1 EP85401184A EP85401184A EP0169110B1 EP 0169110 B1 EP0169110 B1 EP 0169110B1 EP 85401184 A EP85401184 A EP 85401184A EP 85401184 A EP85401184 A EP 85401184A EP 0169110 B1 EP0169110 B1 EP 0169110B1
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EP
European Patent Office
Prior art keywords
tool
axis
nozzle
central part
oriented
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Expired
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EP85401184A
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English (en)
French (fr)
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EP0169110A1 (de
Inventor
Christian Bardin
Henri Cholet
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades

Definitions

  • the present invention relates to an improved rotary drilling tool, with great efficiency in cleaning the working face.
  • Rotary drilling tools comprising a body, a first end of which is connected to rotational drive means and the second end of which, which defines the cutting face, comprises a plurality of attack areas distributed around the the axis of the drill bit, being separated by radial zones for removing the cuttings which communicate at their periphery with the annular space surrounding the first end of the drill bit, behind the cutting face.
  • each of the bit attack areas comprises a plurality of ribs, or segments, of elongated shape, each of which has a face attack bearing a cutting element advantageously made of sintered diamond.
  • Each attack range has a row of irrigation nozzles opening along a radius of the working face, in front of the line of attack for this range, if we consider the direction of rotation thereof. on the waistline. These nozzles create irrigation jets flowing in a direction substantially parallel to the attack faces of the ribs, at a certain distance from these attack faces.
  • a disadvantage of the prior art lies in the fact that the distribution currently adopted for these jets is not favorable to good cleaning of the central part of the tool, which limits the performance in forward speed of the tool and increases wear.
  • the object of the present invention is to propose an improvement to the drilling tools so as to increase the performance thereof by a more efficient sweeping of the cuttings on the cutting face and more particularly in the central part, or central zone, of the tool.
  • the present invention can be applied to drilling tools or drill bits working by chip removal (blade tool) or by abrasion comprising water passages.
  • the first tools mentioned generally include polycrystalline synthetic diamond cutting elements, the second generally include natural diamonds.
  • This objective is obtained according to the present invention, by orienting at least one jet inclined preferentially towards the central part of the tool, the other jets not coming to interfere with this first jet.
  • speed the average value of the speed obtained by integrating the speeds over the shortest distance separating the tool from the geological formation.
  • the jets oriented preferably towards the central part of the tool must be positioned so that the vector obtained by the orthogonal projection on a plane perpendicular to the axis of the tool of the speed of flow in the central part of the tool is not zero. This vector will be called the effective speed vector.
  • This or these jets preferably oriented towards the central part of the tool will advantageously be associated with one or more jets whose flow preferably moves away from the central part of the tool, this or these jets not being on the line segment passing through the axis of the tool and the starting point of a jet preferentially oriented towards the central part of the tool; this line segment mentioned above is limited by the axis of the tool and by the starting point of the jet preferentially oriented towards the central part of the tool.
  • the present invention relates to a method improving the clearance of a rotary drilling tool, in particular on itself in operation, around a proper axis, or axis of the tool.
  • This tool comprises a body, a first end of which is adapted to be connected to rotational drive means and the second end of which defines the cutting face.
  • the second end has water passages.
  • the area of the second end adjacent to said axis constitutes the central part of the tool, the tool comprises at least one nozzle.
  • the central part, or central zone, of the tool is defined by the part of the tool close to the center of the tool itself is defined as being the intersection of the proper axis of the tool with the outer surface of the tool.
  • the method according to the invention is characterized in that said nozzle is positioned in a water passage to produce a flow oriented towards the central part of the tool, the vector obtained by the orthogonal projection on a plane perpendicular to the axis of the tool, the speed of said flow in the central part of the tool being non-zero at all points of the central part of the tool, said vector will be qualified as an effective speed vector as already mentioned previously.
  • the method according to the invention can be applied to the case of a tool comprising several nozzles, in which case these nozzles are positioned and dimensioned to produce a flow resulting in the center of the tool whose effective velocity vector is not zero in any point of the central part of the tool.
  • the or the nozzles are positioned so that there is at least one axis called the circulation axis belonging to the plane perpendicular to the axis of the tool.
  • the orthogonal projections on this axis of the different effective speed vectors of the central part of the tool are called traffic vectors and are oriented in the same direction.
  • said axis can be a curved line. But, preferably, it will be a straight axis passing through the axis of the tool.
  • the present invention also relates to a drilling tool for implementing the method and its variants described above.
  • This tool is characterized in that it comprises at least a first injection nozzle positioned in a first water passage of the tool, said nozzle comprising an injection channel whose axis is oriented substantially towards the central part. of the tool.
  • This nozzle is positioned so that there is at least one axis, called the circulation axis, belonging to said plane perpendicular to the axis of the tool.
  • the various circulation vectors obtained by the orthogonal projection on said circulation axis of the various effective speed vectors of the points of the central part are oriented in the same direction.
  • the tool according to the invention may comprise at least a second nozzle positioned in a second water passage located on the side of the tool opposite to that containing the first nozzle, said opposite side being defined by the portion of the tool located in the half-space delimited by a first plane passing through the axis of the tool, perpendicular to a second plane containing a point of the injection orifice of said first nozzle as well as the axis of the tool and not containing said first nozzle, said nozzle comprising an injection channel adapted to produce a flow substantially oriented in the direction opposite to that defined by the central zone of the tool.
  • the second injection nozzle can be positioned in a water passage located on the tool substantially in a half-plane belonging to the second plane, this half-plane being delimited by the axis of the tool and does not contain the first nozzle.
  • the tool can comprise several fluid injection nozzles having fluid injection channels whose axis is oriented towards the central zone of the tool. These nozzles being positioned in water passages located on the tool on the same side with respect to a plane passing through the axis of the tool.
  • the tool may comprise a third nozzle comprising a third channel, said third nozzle being positioned substantially in the vicinity of said first nozzle, the axis of said third channel being oriented substantially in the opposite direction to that of the first nozzle .
  • the drilling tool when it comprises a number n of water passages greater than or equal to three, it will comprise a number m of adjacent water passages between them two by two, each of these m passages comprising at minus an injection nozzle.
  • the injection channel of this nozzle being oriented towards the central part of the tool.
  • the number m is preferably between one and the whole part of the quotient of the number n by two.
  • At least one of the water passages not equipped with an injection nozzle having an axis channel oriented towards the central part of the tool can be equipped with at least an injection nozzle comprising a channel substantially oriented in the opposite direction to that defined by the central part of the tool.
  • the reference 1 designates, as a whole, the body of the drilling tool or drill bit according to the invention which will, for example, be made of special steel. At a first of its ends, this tool is suitable, to be connected to.
  • means for driving in rotation for example by means of a thread 2.
  • These means for driving the tool in rotation will comprise a tool holder whose bit is made integral, and which is part of the column rotary drilling, or which can be directly rotated by the rotor of a downhole motor.
  • the second end or head 3 of the drill bit has a face defining the cutting face of the tool, this face comprising a plurality of means 4 and 4a for destroying the formation to be drilled.
  • the reference 5 represents the axis of the tool and the reference 6 represents the central part or central zone, of the tool which can be delimited for example by the part of the surface of the second end of the tool included inside a cylinder whose axis coincides with the axis of the tool 5 and whose diameter is equal to the outside diameter of the tool divided by three.
  • the drill bit has water passages 7. To allow the cuttings to be cleaned and removed, a circulation of fluid is carried out.
  • the drilling fluid passes from the internal part of the drill bit to the annular external zone 8 (Fig. 3) lying between the cutting face and the surface of the tool by means of nozzles 9 which direct the fluid directly on the cutting face size following a trajectory f.
  • the cleaning of the cuttings and their evacuation is done by a circulation of the drilling fluid which is brought by the drill string to the interior cavity of the drill bit.
  • the fluid is then distributed by means of a borehole to at least a first nozzle 9 having a fluid injection channel whose axis 17 is oriented substantially towards the central zone 6 of the tool.
  • nozzle injection channel is understood to mean the part of the nozzle which will orient the direction of the jet, thus in FIG. 2, the channel of the nozzle 18 corresponds to the passage 19.
  • the axis 20 of the channel 19 of nozzle 18 can be defined as the direction resulting from the flow, or jet, produced by this channel 19.
  • the axis 20 of the channel 19 of the nozzle 18 is assumed to be oriented in the direction of flow produced by the nozzle, this direction is indicated in FIG. 2 by the arrow 22.
  • the fluid from the nozzle 9 is discharged through the annular 8 (Fig. 3) between the cutting face and the surface of the tool.
  • the drill bit 1 in FIG. 3 has a second nozzle 23 which has an axis 24 oriented towards the ring finger 8.
  • This second nozzle is located in a water passage 16 located on the side of the drill bit 25 opposite to that containing the first nozzle and which bears the reference 26.
  • the so-called opposite side 25 is defined by the portion of the tool situated in the half space delimited by a first plane passing through the axis of the tool perpendicular to a second plane containing a point of the injection orifice of the first nozzle 9 as well as the drill bit axis and which does not contain the first nozzle 9.
  • the tool of FIG. 3 which has an odd number of water passages, in this case five, has an additional nozzle 21 oriented preferentially towards the periphery of the tool and creates a flow directed respectively along the axis 35, the axis 35 being characterized by an angle j3 (the definition of this angle is given in the rest of this text), between 90 ° and 180 ° and which in the specific case of FIG. 3 is substantially equal to 150 °.
  • the axis 35 of the jet created by the nozzle 21 is oriented towards the leading face of the cutting blades, which represents a particularly advantageous configuration for cleaning these cutting blades.
  • the axis 24 of the nozzle 23 is characterized by an angle equal to 180 °.
  • This assembly consisting of nozzles 9, 21 and 23 creates in the central part of the tool a circulation of drilling fluid oriented substantially along the axis 17 of the first nozzle 9, while reducing the vortices.
  • the drill bit in FIG. 3 has a third nozzle 27 which can be supplied with drilling fluid by the same bore as that supplying the first nozzle 9.
  • the axis 28 of the channel of this third nozzle 27 is oriented substantially in the direction opposite to that of the first nozzle. It should be understood by this that the third nozzle 27 has a fluid injection channel which creates a flow moving away from the plane perpendicular to the axis 17 of the first channel.
  • the third nozzle 27 can be supplied by an independent bore, differ from that supplying the first nozzle 9.
  • the reference 11 represents the cutting face as it is machined by the tool.
  • Reference 12 represents the plane tangent to the working face at the point of impact of the jet on the latter.
  • the reference 13 represents the plane tangent to the cutting face at the point closest to the nozzle from which the jet f originates.
  • the reference 14 is the projection oriented in the direction of progression of the tool from the axis of the tool 5 on the plane 13.
  • the reference 15 designates the projection of the trajectory of the jet f at the outlet of the nozzle in projection on the plane 13.
  • ⁇ is the angle formed by the projections 14 and 15.
  • the angle j3 is calculated starting from the half-line AB or A is the point of intersection of the projections 14 and 15.
  • FIG. 6 represents a tool having an even number of water passages, in this case six. This tool has shown very good performance in terms of excavation capacity during experimental tests.
  • the jets used are jets inclined with respect to the working face, so that the angle a formed by the jet f with the plane tangent 12 to the working face at the point of impact of this jet is different from 90 °.
  • jet oriented preferentially towards the central part of the tool is used to refer to any jet coming from a nozzle external to this central part 6 and the projection of the trajectory on a plane perpendicular to the axis 5 of the tool is partly inside the projection on this plane of the central part 6 of the tool. Is also considered as a jet preferentially oriented towards the central part of the tool any jet from a nozzle inside this central part 6 and preferentially oriented towards the center of the tool.
  • a jet is called a jet oriented preferentially towards the central part of the tool when the angle p defined in FIG. 5 has a value less than 90 °.
  • the tool comprises a single oblong-shaped nozzle.
  • the plane of Figure 6 corresponds to a plane perpendicular to the axis of the tool.
  • the axis 38 represents the axis of circulation of the fluid.
  • the arrow 39 represents an effective velocity vector obtained by the orthogonal projection on the plane of the figure of a velocity vector of the flow in the central part of the tool.
  • the reference 40 designates the circulation vector obtained by the orthogonal projection of the effective speed vector 39 on the circulation axis 38.
  • the circulation vector 40 can be obtained directly by projecting the speed of the flow on the circulation axis 38 on a plane perpendicular to the circulation axis 38.
  • the jets f 1 and f 2 create, at the level of the central part of the tool 6, a privileged flow from the water passages 29 and 30 to the water passages 32 and 33 making it possible to efficiently evacuate the spoil being in this area.
  • the use of inclined jets makes it possible to have a high flow speed of the fluid in this zone, by limiting the loss of speed of the jet at the level of the jet impact on the face of size.
  • the jets f 3 and f 4 in the water passages 33 and 32 improve the efficiency of the technique, by facilitating the evacuation of the cuttings pushed by f 1 and f 2 towards the area tool annular.
  • jets f 3 and f 4 also inclined angles ⁇ 3 and a 4 respectively with respect to the cutting face are jets preferentially oriented towards the periphery of the tool.
  • jet oriented preferably towards the periphery of the tool is used to refer to any jet such that the preceding angle ⁇ defined is between 90 ° and 180 °.
  • the jets f s , f ⁇ , f 7 and f ⁇ also also inclined angles ⁇ 5 , ⁇ 6 , a 7 and “ 8 respectively with respect to the cutting face are preferably oriented towards the periphery of the tool.
  • the passage sections of the nozzles which will be denoted S l , S 2 , ..., S 2 may not all be identical.
  • each water passage may include zero, one, or more jets.
  • a water passage comprises several jets, one of which is preferably oriented towards the central part of the tool, this jet will be the one closest to the center of the tool, the center of the tool corresponds at the intersection of the outer surface of the second end of the tool with the axis of the tool 5.
  • the outlet section S of the nozzles can be circular, but can also have other shapes such as an oblong shape, the shape of a slot, etc.
  • a tool comprises only one nozzle, this will preferably be oriented towards the central part of the tool and will preferably have the form of a slot.
  • the application of the invention leads to the best efficiency when all the jets are inclined relative to the working face, but it retains its value when one or more jets are not inclined relative to the working face.
  • the value of the angle a for an inclined jet will advantageously be less than 45 °.
  • the value of the angle 13 for a jet preferentially oriented towards the central part of the tool will advantageously be less than 45 °.
  • the number of jets preferably oriented towards the central part of the tool will preferably be less than or equal to the whole part of half the number of water passages.
  • the jets preferably oriented towards the central part of the tool will preferably be located on the same side of a plane passing through the axis 5 of the tool, in order to prevent these jets from annihilating themselves in the central part of the tool.
  • the jets f 3 , f 4 , fs, f ⁇ , f 7 and f 8 which are not oriented towards the central part of the tool and whose function is in particular the cleaning of the surface of the tool in contact with the cutting face, this surface not including the central part of the tool, creates a centrifugal flow directed towards the cutting blades which is particularly effective for cleaning the tool and in particular its periphery.
  • the nozzles positioned on the tool can be removable or fixed, of identical or different section.
  • the fixed nozzles may be formed by a simple channel made directly in the body of the tool and having an appropriate inclination of the injection orifice.
  • the sum of the sections of the jets preferentially oriented towards the central part of the tool will preferably be greater than or equal to one third of the total section ST of passage of the nozzles placed on the tool and preferably less or equal to two-thirds of the ST section.
  • FIG. 7 represents a diagram showing the gain brought by the invention on the capacity of the drilling tool to evacuate the cuttings which it creates at the bottom of the wellbore.
  • the y-axis 35 of this diagram represents the capacity of a tool to remove spoil.
  • the abscissa axis 10 represents the time during which a drilling fluid was passed through the tool.
  • the reference 36 corresponds to the performance curve of a tool according to the present invention and the reference 37 corresponds to the performance curve of a tool according to the prior art.
  • the tool is placed in a cell simulating the bottom of the wellbore. Between the tool and the cell, a given volume V of sand simulating the cuttings is introduced.
  • a fluid is circulated at a given flow rate through the tool and, as a function of time, the volume of cuttings evacuated is recorded relative to the volume of cuttings initially placed in the cell.
  • the capacity of the tool to remove the cuttings corresponds to the ratio of the volume of cuttings removed to the initial volume of cuttings V.
  • the tool In the case of the tool according to the invention, the cuttings being quickly removed from the cutting face, the tool is therefore permanently in contact with the rock to be destroyed and not in contact with the cuttings it has just created. .
  • This has the consequence of increasing the speed of advance of the drilling tool and of avoiding the regrinding of the cuttings by this tool which would limit the effectiveness of the tool and would cause initial wear thereof.
  • the performance curve 37 of a tool according to the prior art substantially reaches a horizontal asymptote corresponding to a removal capacity of the cuttings of the order of 60%, which means that the cuttings remaining, ie close to 40% of the initial cuttings are very difficult to remove.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Claims (9)

1. Verfahren zum Verbessern der Bohrtrümmerbeseitigung eines Bohrwerkzeugs (1), welches im Betrieb sich inbesondere um sich selbst, um eine eigene Achse (5) oder Werkzeugachse dreht, wobei dieses Werkzeug einen Körper umfaßt, von dem ein erstes Ende so ausgebildet ist, daß es sich mit Drehantriebseinrichtungen verbindet und dessen zweites Ende (3) die Schneidfront begrenzt, wobei das zweite Ende Wasserdurchlässe umfaßt, wobei die dieser Achse benachbarte Zone des zweiten Endes den Mittelteil des Werkzeugs (6) bildet und das Werkzeug wenigstens eine Düse (9) aufweist, dadurch gekennzeichnet, daß diese Düse in einem Wasserdurchlaß angeordnet ist, um eine qegen den Mittelteil (6) des Werkzeugs orientierte Strömung zu erzeugen, wobei der durch orthogonale Projektion auf eine Ebene senkrecht zur Achse des Werkzeugs der Strömungsgeschwindigkeit im mittleren Teil des Werkzeugs erhaltene Vektor (39) ungleich null an jedem Punkt dieses mittleren Teils ist, wobei dieser Vektor den Wirkgeschwindigkeitsvektor darstellt, daß diese Düse (9) derart positioniert ist, daß wenigstens eine Achse, die sog. Zirkulationsachse (38), existiert, die zu dieser Ebene senkrecht zur Achse des Werkzeugs gehört, daß die verschiedenen Zirkulationsvektoren (40), die durch die orthogonale Projektion auf diese Zirkulationsachse der verschiedenen Vektoren der Wirkgeschwindigkeit (39) der Punkte des mittleren Teils erhalten wurden, in der gleichen Richtung orientiert sind.
2. Verfahren nach Anspruch 1, angewendet auf den Fall eines Werkzeugs mit mehreren Düsen (9, 21, 23), dadurch gekennzeichnet, daß diese Düsen positioniert und dimensioniert sind, um im mittleren Teil des Werkzeugs eine resultierende Strömung zu erzeugen, deren Wirkgeschwindigkeitsvektor ungleich null an jedem Punkt dieses mittleren Teils des Werkzeugs ist.
3. Bohrwerkzeug zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß es wenigstens eine erste Einspritzdüse (9) umfaßt, die in einem ersten Wasserdurchlaß (7) des Werkzeugs positioniert ist, wobei diese Düse einen Einspritzkanal umfaßt, dessen Achse (17) im wesentlichen gegen den mittleren Teil des Werkzeugs (6) orientiert ist, wobei diese Düse (9) derart positioniert ist, daß wenigstens eine Achse, die sog. Zirkulationsachse (38), existiert, die zur Ebene senkrecht zur Achse des Werkzeugs gehört, daß die verschiedenen Zirkulationsvektoren (40), die durch die orthogonale Projektion auf diese Zirkulationsachse der verschiedenen Vektoren der Wirkgeschwindigkeit (39) der Punkte des mittleren Teils erhalten wurden, in der gleichen Richtung orientiert sind.
4. Bohrwerkzeug nach Anspruch 3, dadurch gekennzeichnet, daß es wenigstens eine zweite Düse (23) umfaßt, die in einem zweiten Wasserdurchlaß (16) positioniert ist, der auf der Seite (25) des Werkzeugs angeordnet ist, die entgegengesetzt der (26) zur ersten Düse (9) gehörenden lokalisiert ist, wobei diese entgegengesetzte Seite (25) definiert ist durch den Teil des Werkzeugs, der sich in dem durch eine erste durch die Achse des Werkzeugs (5) gehenden Ebene begrenzten Halbraum befindet, die senkrecht zu einer zweiten Ebene ist, die einen Punkt der Einspritzöffnung dieser ersten Düse (9) sowie die Achse des Werkzeugs und nicht diese erste Düse (9) enthält, wobei diese Düse (23) einen Einspritzkanal umfaßt, der so ausgelegt ist, daß er eine Strömung erzeugt, die im wesentlichen in der Richtung orientiert ist, welche derjenigen entgegengesetzt ist, die durch den Mittelteil des Werkzeugs definiert ist.
5. Werkzeug nach Anspruch 4, dadurch gekennzeichnet, daß diese zweite Einspritzdüse (23) in einem Wasserdurchlaß positioniert ist, der sich auf dem Werkzeug im wesentlichen in einer zur zweiten Ebene gehörenden Halbebene befindet, wobei diese Halbebene durch die Achse des Werkzeugs begrenzt ist und diese erste Düse nicht enthält.
6. Werkzeug nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß es mehrere Fluideinspritzdüsen mit Fluideinspritzkanälen enthält, deren Achse gegen die Mittelzone des Werkzeugs orientiert ist und daß diese Düsen in Wasserdurchlässen positioniert sind, die auf dem Werkzeug auf der gleichen Seite bezogen auf eine durch die Werkzeugachse gehenden Ebene sich befinden.
7. Werkzeug nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß es eine dritte Düse (27) mit einem dritten Kanal umfaßt, wobei die dritte Düse (27) im wesentlichen benachbart der ersten Düse (9) positioniert ist, wobei die Achse (28) dieses dritten Kanals im wesentlichen in der der jenigen der ersten Düse entgegengesetzten Richtung orientiert ist.
8. Bohrwerkzeug nach einem der Ansprüche 3 bis 7, wobei das Werkzeug eine Anzahl n von Wasserdurchlässen, die größer oder gleich drei ist, umfaßt, dadurch gekennzeichnet, daß es eine Anzahl m von untereinander zu je zwei benachbarten Wasserdurchlässen umfaßt, von denen ein jeder wenigstens eine Einspritzdüse mit einem Einspritzkanal umfaßt, der gegen den mittleren Teil des Werkzeugs orientiert ist, wobei diese Zahl m zwischen eins und dem qanzen Teil des Quotienten der Zahl n geteilt durch zwei beträgt.
9. Bohrwerkzeuq nach Anspruch 8, dadurch gekennzeichnet, daß wenigstens einer der nicht mit Einspritzdüsen ausgestatteten Wasserdurchlässe einen Kanal von einer Achse hat, die gegen den mittleren Teil des Werkzeugs orientiert ist und mit wenigstens einer Einspritzdüse mit einem Kanal ausgestattet ist, der im wesentlichen in der Richtung orientiert ist, die entgeqengesetzt zu der durch den mittleren Teil des Werkzeugs definierten orientiert ist.
EP85401184A 1984-06-27 1985-06-14 Bohrwerkzeuge mit Wasserdurchlässen zur Erzielung einer hohen Reinigungswirkung der Angriffsfläche Expired EP0169110B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8410127A FR2566833B1 (fr) 1984-06-27 1984-06-27 Methode et perfectionnement aux outils de forage comportant des passages d'eau permettant une grande efficacite du nettoyage du front de taille
FR8410127 1984-06-27

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EP0169110A1 EP0169110A1 (de) 1986-01-22
EP0169110B1 true EP0169110B1 (de) 1989-07-19

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US (1) US4733734A (de)
EP (1) EP0169110B1 (de)
DE (1) DE3571667D1 (de)
FR (1) FR2566833B1 (de)

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Also Published As

Publication number Publication date
FR2566833A1 (fr) 1986-01-03
US4733734A (en) 1988-03-29
EP0169110A1 (de) 1986-01-22
DE3571667D1 (en) 1989-08-24
FR2566833B1 (fr) 1986-11-14

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