EP0944765B1 - Kern- /bohrwerkzeug - Google Patents

Kern- /bohrwerkzeug Download PDF

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Publication number
EP0944765B1
EP0944765B1 EP97949846A EP97949846A EP0944765B1 EP 0944765 B1 EP0944765 B1 EP 0944765B1 EP 97949846 A EP97949846 A EP 97949846A EP 97949846 A EP97949846 A EP 97949846A EP 0944765 B1 EP0944765 B1 EP 0944765B1
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EP
European Patent Office
Prior art keywords
cutting
elements
drill
blade
tool according
Prior art date
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.)
Revoked
Application number
EP97949846A
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English (en)
French (fr)
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EP0944765A1 (de
Inventor
Etienne Lamine
Sebastian Desmette
Cécile JOSSE
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Halliburton Energy Services Inc
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Halliburton Energy Services Inc
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Publication date
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Application filed by Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Publication of EP0944765A1 publication Critical patent/EP0944765A1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B10/006—Drill bits providing a cutting edge which is self-renewable during drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements

Definitions

  • the present invention relates to a tool for drilling and / or coring, in particular for drilling and / or oil coring, such as the preamble to the claim 1, as also disclosed in GB-A-2 204 625 or FR-A-2 620 487.
  • the object of the present invention is to improve the drilling and / or coring conditions known to this update and offers a tool which, on the one hand, provides a particularly advantageous arrangement and economical blades and cutting elements for avoid unnecessary regrinding of debris detached from the training and which, on the other hand, provides for a reserve cutting elements which will only be practically service and solicited only when needed, for example following the removal of a cutting element, possibly in PDC, located on a leading edge.
  • the leading edge of the blades has the shape of a propeller with possibly variable radius and which, at least along said peripheral surface, turns either in opposite direction of the direction of drilling rotation either in the same direction as it moves away from the anterior face.
  • the width of a blade taken in a projection plane perpendicular to the axis of rotation, increases as we move away from it, on the anterior face, and / or thereof in direction of a rear face of the tool. he can be advantageous while the number of cutting elements arranged one behind the other on the same blade and on of the same aforementioned distances, radial and parallel to the axis of rotation, increases progressively, in particular an element preferably of a length equal to that of the aforementioned cutting elements, as the width of the blade increases.
  • Figure 1 shows schematically in a half plan view, as a tool, a head drilling of the invention.
  • Figure 2 shows schematically, in axial section, a superposition in the half-plane of section, after adequate rotation around the axis of rotation, projections of all cutting elements in PDC and secondary of the different blades of a tool drilling.
  • Figure 3 shows schematically in a half plan view, as a tool, a crown of coring of the invention.
  • FIG. 4 schematically represents, from the same way as that of FIG. 2 but simplified, projections of cutting elements in PDC circular and oblong secondary cutting elements of different blades.
  • Figure 5 shows schematically, in a partial plan view, another embodiment of a drill head as a tool of the invention.
  • Figure 6 shows schematically, at the as shown in Figure 4 but on another scale, a projection of the cutting elements in an axial half-plane various blades of a drilling head of the invention.
  • Tool 1 of the invention comprises so known, as shown in Figures 1, 2 and 3, a body 2 having a peripheral surface 3 substantially cylindrical and an anterior face 4 considering a direction of advance of drilling and / or coring. 5 extend from the anterior face 4 to the peripheral surface 3 and they each have a leading edge 6 for drilling or coring.
  • Sharp elements in PDC 7 are located at least in the area central 15A and are arranged so that their longitudinal axes are transverse to the axis of tool rotation 1.
  • Elements in PDC 7C can be distributed along the leading edge 6 of each blade 5; they each have a cutting edge 8 constituting together the leading edge 6.
  • secondary cutting element 10 By secondary cutting element 10, one can hear here a cutting element arranged outside the central zone 15A, of which the cutting edge 8 is part from the leading edge 6.
  • a secondary element 10 can be made by sintering and contain grains abrasives and a metallic binder.
  • Nozzles 9 ( Figures 1 and 2, not shown in Figure 3) are usually provided on the front side 4 in order to provide through them a adequate liquid at the bottom of the well during operation.
  • the tool 1 includes plus, behind at least one cutting element in PDC 7C ( Figure 5) or a secondary element 10 ( Figure 1) in considering a direction of rotation of drilling S of the tool 1, at least one cutting element 10A associated with the element 7C or 10, which has a cross section of the same shape, at least for its projecting part of the blade 5, that that of the latter and which is arranged on the same blade 5 as the element 7C or 10 with which it is associated.
  • a cutting edge 11 of the associated element 10A is at plus the same radial distance R ( Figure 2) from the axis of rotation and at least the same distance D, measured parallel to this axis of rotation from a plane P perpendicular to this axis and located in front of the tool 1, that the cutting edge 8 of the element in PDC 7C or secondary 10 associated.
  • the associated item (s) 10A can therefore be set back from the elements 7C or 10 ( Figure 6) regarding the training to drill or core.
  • Figures 1 and 5 show for example that beyond a determined diameter around the axis of rotation, one or more associated elements 10A are thus behind each element in PDC 7C or secondary 10 arranged on the leading edge 6 of the same blade 5.
  • the elements in PDC 7 and secondary 10 partners each time form a portion of ring centered on the axis of rotation.
  • the cutting elements in PDC 7 or 7C being usually mostly cylindrical, it can be preferred that secondary elements 10 and / or associated 10A are also and then advantageously present a diameter equal to that of the PDC 7C element corresponding.
  • the diameters of the elements in PDC 7, 7C, secondary 10 and / or associated 10A can be either all equal be different from each other, by example depending on their distance from the axis of rotation.
  • the closest cutting elements 10 of the axis of rotation are shown as having a same diameter and same orientation around this axis than the other cutting elements 10 located further from the axis of rotation.
  • these 10 most relatives are represented as having a greater length to that of the other elements 10 located further of the axis of rotation. They could however have the same length as these.
  • the crown 1 does not include cutting elements made of PDC 7.
  • PDC 7C, secondary 10, and associates 10A have been shown above as possibly be cylindrical ( Figures 2 and 6). At least some associated elements 10A could however present other cross sections, for example oblong, elliptical or oval ( Figure 4), the major axis of the oval or ellipse can then advantageously be substantially perpendicular to a plane tangent to an envelope 15B of the cutting elements 7, 10, 10A to the point of contact between the cutting edge 11 of the associated element 10A in question and this envelope 15B.
  • Associated oblong 10A elements of this kind increase what can be called the volume of matter abrasive per unit of active surface of tool 1, being given the reservation that this accumulates deep into tool 1 and which can be used. It appears however that circular 10A associated elements increase already considerably this volume compared to the case so-called impregnated tools.
  • tool 1 of the invention it is preferred as cutting elements in PDC 7C ( Figure 5) or secondary 10 ( Figures 1 and 3) and the elements associated 10A neighbors are practically attached one to the other by their end faces facing one the other.
  • Possible gaps between two elements 7C, 10, 10A neighbors and associates, resulting in example of the curvature of tool 1 seen in a plane intersecting perpendicular to the axis of rotation can be filled in the usual way in the trade (material infiltration, adequate sealant, etc.).
  • the leading edge 6 of each blade 5 of the tool 1 of the invention present in the whole a form of propeller, with variable diameter from the axis of rotation or from its most extreme close to it, on the anterior side 4, up to its opposite end located on the peripheral surface cylindrical 3 of body 2.
  • This propeller can rotate either in the same direction either in the opposite direction to the direction of rotation S during drilling as it deviates of the axis of rotation and / or of the anterior face 4.
  • the leading edge 6, seen in plan can start radially, or even in the direction of the tool rotation S near the axis of rotation and can then bend to go in the opposite direction of said direction of rotation S.
  • each blade 5 can project from the body 2 and present, as an external surface, a portion of the surface of revolution 12 in which elements are implanted cutting in PDC 7C or secondary 10 and associated 10A and which is delimited by anterior lateral faces 13 and posterior 14 (depending on the direction of rotation S in progress drilling or coring) which, in projection ( Figures 1, 3 and 5), follow the shape of the propeller of a leading edge 6 correspondent.
  • anterior lateral face 13A of a blade 5A follows the shape of the leading edge 6A of this same blade 5A while the posterior lateral face 14A of this blade 5A rather follows the shape of the edge 6B of the next 5B blade or a plot intermediate between those of the leading edges 6A and 6B.
  • the width of the portion of surface 12 and therefore the width of the blade 5, measured in a projection plane perpendicular to the axis of rotation, increases as one moves away from it on the anterior face 4 and / or that one deviates from this, on the peripheral surface 2, towards of a rear face 15 (FIG. 2) of the tool 1.
  • the number of cutting elements associates 10A arranged one behind the other and behind a cutting element 7C, 10 on the blade 5, to the same level D taken parallel to the axis of rotation and by with respect to a plane P which is perpendicular thereto, can gradually increase by an associated element 10A.
  • all elements in PDC 7C and / or secondary 10 and / or associated 10A have the same length.
  • Secondary cutting elements 10 and / or associates 10A are advantageously made in one cheaper material than that of PDC 7 elements.
  • secondary elements 10 and / or associated 10A are by example made of a composite material containing abrasive particles. It can be carbide sintered or infiltrated tungsten known to man of the loom, and possibly including particles of diamond.
  • associated elements 10A can however also be made in PDC and arranged by example between two other associated elements 10A in composite material cheaper than PDC, in the same line at the same level on a blade 5.
  • Elements secondary 10 and / or associated 10A can also be made in what is called in the profession of thermostable synthetic diamond.
  • Secondary elements 10 and / or associated 10A can have a different hardness between them, for example according to their position on tool 1, and may also contain percentages (by volume) variable in abrasive and / or diamond particles.
  • At least one blade 5 can extend into an area central 15A of the front face 4 and one of the blades 5 may present a cutting element in PDC 7B which acts practically in the center of this face 4.
  • the blade (s) 5 may preferably not have only PDC 7B cutting elements without associated cutting element 10A.
  • blade 5A can be closer to the axis of rotation than the others blades 5 and have a reduced width in this area central 15A.
  • blades like the 5B can start outside the central zone 15A and have as soon as they start a width such as several cutting elements 7C or 10 and 10A can be arranged online at a first level D most anterior on this blade 5B.
  • Drilling fluid conduits ( Figure 1) and / or coring can be provided so usual in tool 1.
  • the outlet nozzles 9 of this liquid can be of a type to be screwed into tool 1 so as to be exchangeable according to their dimensions flow and therefore the flow of liquid to the bottom of a well being drilled.
  • Nozzles 9 can however be made up of prefabricated elements. So when the manufacture of a tool 1 by molding, these elements prefabricated can be installed in locations provided in the mold at the same time as they are placed, in adequate locations, cutting elements in PDC 7, secondary la and associated 10A. The mold is then filled in the usual way with solid elements and powdered materials which constitute in a known manner itself, after infiltration of a liquid metal in this mass, the body 2 and the blades 5 proper, the liquid metal then fixing the elements at the same time prefabricated and cutting elements 7, 10, 10A aux blades 5 thus produced.
  • the cutting elements 7, 10, 10A are arranged at levels D and distances R from the axis of rotation chosen so that projection in a plane passing through the axis of rotation ( Figures 2, 4 and 6), the cutting elements 7, 10, 10A are complement each other to form at the bottom of a well drilled or cored a 15B envelope with leading edges 6 as regular as possible, without leaving high circular projections 16 between two circular grooves 17 cut by the cutting edges 8, 11 of the assembly leading edges 6 in formation 17A to be drilled or carotter.
  • the front face 4 of the tool drilling 1 (figure 2) is preferably concave in the central zone 15A and the cutting elements 7, 10, 10A are arranged so as to cut a bottom of the hole substantially conical drilling with a slight slope, for example between 10 ° and 30 °, relative to a perpendicular plane at the axis of rotation, the cone pointing towards the end back 15 of tool 1 in working position.
  • a 20 ° slope may be preferred.
  • the blades 5 in a helix are advantageously arranged on the peripheral surface 3 of so that, seen according to the projection of FIG. 1, a blade 5A covers the rear end 18F of a 5F blade which extends (in the case of this figure) along arrow 19A to below the part visible from slide 5A in this view, and the same for others. So continuity is assured, without shock, a bearing (thus improved) of tool 1 against a wall for example of the well being drilled.
  • the propeller described in the case of the drilling tool 1 can be considered to be a portion of a spiral, on the front side 4, followed by a properly propeller said on the peripheral surface 3.
  • a channel 19 ( Figures 1 and 2) is provided each time between two blades 5 and, advantageously, it widens at least from its furthest end close to the axis of rotation and possibly up to reach a specific width, for example as that the blades 5 which surround it widen.
  • Secondary cutting elements 10 and / or associates 10A preferably have their end faces 20 (anterior and / or posterior) parallel to the axis of rotation of the tool 1. These end faces 20 can form an angle with a radius starting from this axis rotating and going through any of their points.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Claims (15)

  1. Vorrichtung zum Bohren oder Kernbohren, insbesondere zum Bohren oder Kernbohren nach Erdöl, umfassend:
    einen Körper (2), der eine zylinderförmige Außenfläche (3) aufweist, sowie eine vordere Seite (4) in Blickrichtung der Bohrung oder der Kernbohrung,
    Klingen (5), die sich von der vorderen Seite (4) bis zur Außenfläche (3) erstrecken und die jeweils eine Vorderkante (6) zum Bohren oder Kernbohren aufweisen,
    gegebenenfalls PDC-Schneidelemente (7), die zumindest in einem zentralen Bereich (15A) der vorderen Seite (4) angeordnet sind und deren Längsachsen quer zur Rotationsachse der Vorrichtung (1) verlaufenen,
    Zusätze (9) zum Zubringen von Bohrflüssigkeit, und,
    außerhalb des zentralen Bereichs (15A) und auf mindestens einer Klinge (5),
    Eingriffsschneidelemente (7C, 10), die ausgewählt sind aus PDC-Schneidelementen und Sekundärschneidelementen (10), die jeweils plattenförmig ausgebildet sind, die jeweils eine Schneidkante (8) aufweisen, die zusammen mit der Vorderkante (6) und der Klinge (5) einen Aufbau bilden, und deren Längsachse quer zur Rotationsachse steht, und
    mindestens ein strukturell ähnliches Schneidelement (10A), das in Blickrichtung der Bohrrotation (S) der Vorrichtung (1) hinter mindestens einem Eingriffsschneidelement (7C, 10) angeordnet ist und das auf der gleichen Klinge (5) angeordnet ist,
    dadurch gekennzeichnet, dass das strukturell ähnliche Schneidelement (10A)
    eine plattenförmige Querschnittsform aufweist, die mindestens im Hinblick auf den vorstehenden Teil der Klinge (5) denselben Verlauf hat, wie diejenige des Eingriffsschneidelementes (7C, 10),
    für den Schnitt eine Kante (11) umfasst, die mindestens im gleichen Radialabstand (R) von der Rotationsachse angeordnet ist sowie mindestens im gleichen Abstand (D), gemessen parallel zu dieser Rotationsachse, ausgehend von einer senkrechten Ebene (P) zu dieser Achse vor der Vorrichtung (1), wie die Schneidkante (8) des Eingriffsschneidelements (7C, 10), und
    angebaut ist über eine Endseite an eine angrenzende Endseite des Eingriffsschneidelements (7C, 10) oder eines strukturell ähnlichen Schneidelements (10 A), das unmittelbar benachbart auf der gleichen Klinge (5) vorliegt.
  2. Vorrichtung zum Bohren oder Kernbohren nach Anspruch 1, dadurch gekennzeichnet, dass ein Teil jedes strukturell ähnlichen Schneidelements (10A) in die Klinge (5) zu seiner Befestigung am Vorrichtungskörper (2) eingetrieben ist, und dadurch, dass vorzugsweise das strukturell ähnliche Element (10A), das auf diese Weise befestigt ist, eine gleichmäßige Dicke aufweist sowie einen Querschnitt entlang einer Fläche, die im rechten Winkel zur Längsachse des Messers steht, der kreisförmig, länglich, elliptisch oder oval ist, mit einer Schneidenseite, die in entsprechender Weise zumindest teilweise gemäß der Ausbildung in Rotationsrichtung der Vorrichtung geformt ist.
  3. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Sekundärschneidelemente (10) und/oder die strukturell ähnlichen Schneidelemente (10A) durch Sintern vorgefertigte Elemente sind, die Schleifkörner und ein metallisches Bindemittel umfassen.
  4. Vorrichtung zum Bohren oder Kembohren nach einem der Ansprüche 1 bis 3,dadurch gekennzeichnet, dass die PDC-Schneidelemente (7) und/oder die Sekundärschneidelemente (10) und/oder strukturell ähnlichen Schneidelemente (10A) zylinderförmig sind und vorzugsweise den gleichen Durchmesser aufweisen.
  5. Vorrichtung zum Bohren oder Kembohren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Vorderkante (6) der Klingen (5) eine Schneckenform mit gegebenenfalls variablem Durchmesser aufweist, die zumindest entlang der Außenfläche (3) sich entweder entgegen der Richtung Bohrrotation (S) oder in Richtung der Bohrrotation dreht, in Abhängigkeit wie sie sich von der vorderen Seite (4) entfernt.
  6. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sich die Breite einer Klinge (5), gemessen in einer Projektionsebene senkrecht zur Rotationsachse, in Abhängigkeit der Vergrößerung des Abstandes auf der vorderen Seite (4) vergrößert und/oder in Abhängigkeit der Vergrößerung des Abstandes in Richtung einer hinteren Seite (15) der Vorrichtung (1).
  7. Vorrichtung zum Bohren oder Kernbohren nach Anspruch 6, dadurch gekennzeichnet, dass die Anzahl der strukturell ähnlichen Schneidelemente (10A), die hintereinander auf der gleichen Klinge (5) und im selben Abstand (D, R) angeordnet sind, sich mehr und mehr vergrößert, besonders die Anzahl eines strukturell ähnlichen Schneidelements (10A), vorzugsweise von einer Länge, die gleich der Länge der Sekundärschneidelemente (10) ist, in Abhängigkeit, wie sich die Breite der Klinge (5) vergrößert.
  8. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Sekundärschneidelemente (10) und/oder die strukturell ähnlichen Schneidelemente (10A) aus einem Kompositmaterial ausgebildet sind, das Schleifkömer enthält.
  9. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Sekundärschneidelemente (10) und/oder die strukturell ähnlichen Schneidelemente (10A) wärmestabile synthetische Diamanten sind.
  10. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 9,dadurch gekennzeichnet, dass die Zusätze (9) erhältlich sind aus vorgefertigten Elementen, die an vorgesehenen Stellen in einer Fabrikationsform gleichzeitig angeordnet werden, wenn dort in geeignete Stellen die PDC-Schneidelemente (7) eingesetzt werden, und/oder die Sekundärschneidelemente (10) und/oder die strukturell ähnlichen Schneidelemente (10A), wobei die Form anschließend aufgefüllt wird mit festen Elementen und pulverförmigem Material, die nach Infiltration mit flüssigem Metall den Körper (2) und die Klingen (5) aufbauen.
  11. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass mindestens eine Klinge (5) sich in den zentralen Bereich (15A) der vorderen Seite (4) erstreckt und mindestens eines der PDC-Schneidelemente (7) umfasst, das vorgesehen ist, um im Zentrum dieser Seite (4) zu wirken, wobei die Schneidkante (8) dieses PDC-Schneidelements (7) zur Schneid kante (6) der Klinge (5) gehört.
  12. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass mindestens ein strukturell ähnliches Schneidelement (10A) einen ländlichen Querbereich aufweist und dadurch, dass vorzugsweise die größte Dimension dieses Querbereich senkrecht orientiert ist zu einer Ebene, die eine Hüllkurve (15B) der Schneidelemente (7,10, 10) am Berührungspunkt zwischen der betreffenden Schneidkante (11) des strukturell ähnlichen Elements (10A) und der Hüllkurve (15B) tangiert.
  13. Vorrichtung zum Bohren oder Kembohren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass die Längsachse zumindest einiger der PDC-Schneidetemente (7) und/oder der Sekundärschneidelemente (10) eine Neigung aufweisen im Hinblick auf eine Ebene, die senkrecht auf der Rotationsachse steht, sodass deren Endseite, die die Schneid kante (8) umfasst, ein wenig zu dem Boden es zu bohrenden Lochs gewandt ist.
  14. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die Längsachse zumindest bestimmter Sekundärelemente (10) und/oder strukturell ähnlicher Elemente (10A) jeweils in einer Ebene enthalten ist, die senkrecht auf der Rotationsachse steht.
  15. Vorrichtung zum Bohren oder Kernbohren nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, dass die vordere Seite (4) im zentralen Bereich (15A) konkav ist und dadurch, dass die Schneidelemente (7,10, 10A) dort angeordnet sind, um einen Bohrlochboden zu schneiden, der konisch ist und ein schwaches Gefälle im Hinblick auf eine Ebene hat, die senkrecht auf der Rotationsachse steht.
EP97949846A 1996-12-16 1997-12-16 Kern- /bohrwerkzeug Revoked EP0944765B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9601042 1996-12-16
BE9601042A BE1010801A3 (fr) 1996-12-16 1996-12-16 Outil de forage et/ou de carottage.
PCT/BE1997/000136 WO1998027311A1 (fr) 1996-12-16 1997-12-16 Outil de forage et/ou de carottage

Publications (2)

Publication Number Publication Date
EP0944765A1 EP0944765A1 (de) 1999-09-29
EP0944765B1 true EP0944765B1 (de) 2003-02-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97949846A Revoked EP0944765B1 (de) 1996-12-16 1997-12-16 Kern- /bohrwerkzeug

Country Status (7)

Country Link
US (1) US6283233B1 (de)
EP (1) EP0944765B1 (de)
BE (1) BE1010801A3 (de)
CA (1) CA2274152C (de)
DE (1) DE69719364T2 (de)
NO (1) NO328796B1 (de)
WO (1) WO1998027311A1 (de)

Families Citing this family (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9708022D0 (en) * 1997-04-21 1997-06-11 Camco Int Uk Ltd Curved blades and gauge
BE1014014A5 (fr) * 1999-11-29 2003-02-04 Baker Hughes Inc Trepan impregne comportant des elements de coupe pdc dans la zone de cone.
US6843333B2 (en) 1999-11-29 2005-01-18 Baker Hughes Incorporated Impregnated rotary drag bit
US6510906B1 (en) 1999-11-29 2003-01-28 Baker Hughes Incorporated Impregnated bit with PDC cutters in cone area
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WO1998027311A1 (fr) 1998-06-25
DE69719364D1 (de) 2003-04-03
CA2274152A1 (en) 1998-06-25
EP0944765A1 (de) 1999-09-29
NO328796B1 (no) 2010-05-18
BE1010801A3 (fr) 1999-02-02
US6283233B1 (en) 2001-09-04
CA2274152C (en) 2006-01-31
NO992905D0 (no) 1999-06-14
DE69719364T2 (de) 2003-12-04
NO992905L (no) 1999-08-12

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