EP0327925B1 - Apparatus for the random straight or directional drilling into underground formations - Google Patents

Apparatus for the random straight or directional drilling into underground formations Download PDF

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Publication number
EP0327925B1
EP0327925B1 EP89101615A EP89101615A EP0327925B1 EP 0327925 B1 EP0327925 B1 EP 0327925B1 EP 89101615 A EP89101615 A EP 89101615A EP 89101615 A EP89101615 A EP 89101615A EP 0327925 B1 EP0327925 B1 EP 0327925B1
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EP
European Patent Office
Prior art keywords
stabilising
rotary
housing
bit
drilling tool
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.)
Expired - Lifetime
Application number
EP89101615A
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German (de)
French (fr)
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EP0327925A1 (en
Inventor
Volker Dr.-Ing. Krüger
Johannes Dipl.-Ing. Witte
Rainer Dr.-Ing. Jürgens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Hughes Oilfield Operations LLC
Original Assignee
Eastman Christensen Co
Eastman Teleco Co
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Publication date
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Publication of EP0327925A1 publication Critical patent/EP0327925A1/en
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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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/068—Deflecting the direction of boreholes drilled by a down-hole drilling motor

Definitions

  • the invention relates to a device for drilling a borehole with a choice of a straight or curved center line in underground rock formations according to the preamble of claim 1.
  • a first known device In order to create a deflection angle for the axis of rotation of the chisel shaft during directional drilling, which is also decisive for the build-up rate that can be achieved, in a first known device (EP-OS 45 444) the first and the second stabilizer are arranged eccentrically on a straight tube-shaped housing of the rotary drilling tool. Such a design imprints the housing in the directional drilling operation a deflection that is decisive for the deflection angle.
  • a second known device in the case of stabilizers arranged concentrically on the housing of the rotary drilling tool, the housing is provided with regions which are deflected with respect to the main axis of the tool and which define two oppositely directed kink points which jointly determine the deflection angle.
  • the deflection of the housing areas can be designed such that only a single kink defines the deflection angle between the two stabilizers.
  • a kink between the rotary drill bit and the first stabilizer is provided in a third known device of the type mentioned (EP-PS 0 109 699, DE-PS 33 26 855 ).
  • This kink is formed in that the chisel shaft is mounted at an angle to the axis of the straight tubular housing in the lower region thereof and exits the housing end at an angle.
  • the chisel shaft is mounted in the housing of the rotary drilling tool with an axis of rotation offset laterally parallel to the housing axis.
  • the invention is based on the object of designing a device of the generic type in such a way that its rotary drilling tool provides a higher course accuracy and, with reduced wear, a higher drilling performance when directional drilling.
  • the special alignment of the axis of its chisel shaft gives the rotary drill bit a guide which is substantially relieved of the resultant lateral forces during directional drilling, with the consequence of less wear and tear and a higher drilling capacity.
  • the device according to the invention illustrated in a schematic overview in FIG. 1 comprises a rotary drilling tool 2 located in a borehole 1, the housing 3 of which is connected at its upper end to a drill pipe string 4.
  • the drill pipe string 4 is clamped in a turntable 5 of a drilling tower 6.
  • the turntable 5 is provided with a drive and blocking device 7, by means of which the chuck of the turntable 5 and thus the drill pipe string 4 can be set in continuous self-rotation or aligned and then by a limited rotary movement can be fixed against rotation.
  • the first embodiment of a rotary drilling tool 2 illustrated in FIGS. 1 to 4 has a housing 3 consisting of a plurality of parts or sections 8, 9, 10, 11, 12 screwed to one another.
  • the housing part 10 is formed over part of its length as a stator 13 of a deep-hole motor with a rotor 14.
  • the deep-hole motor 13, 14 in the exemplary embodiment illustrated in FIGS. 3 and 4 is a displacement motor operating according to the Moineau principle, but can also be formed by a turbine or a motor of another suitable construction.
  • the rotor 14 is connected by means of an articulated shaft 15 arranged in the housing part 11 to the upper end of a chisel shaft 16, which is rotatably mounted in bearings 17, 18 of the housing part 12 forming a bearing bracket and, in the embodiment of the rotary drilling tool according to FIGS 19 which encloses a small angle with the housing axis 20 of the housing part 12.
  • the chisel shaft 16, which is provided with a rotary drill bit 21 at its outer end emerges obliquely from the lower end of the housing 3.
  • the rotary drilling tool 2 In its lower region near the rotary drill bit 21, the rotary drilling tool 2 has a first stabilization point 22 in the form of a stabilizer 24 attached to the housing part 12 with a number of stabilizer wings or ribs distributed over the circumference. At a distance above this first stabilization point 22, the rotary drilling tool 2 has a second stabilization point 25, which is likewise formed by a conventional stabilizer 24 arranged on the housing part 8.
  • the imaginary centers of these stabilization points 22, 25, together with an imaginary center point of the rotary drill bit, define the course of an imaginary center line for the borehole 1, which has an arcuate course in regions of the borehole 1 drilled during directional drilling work, which approximately forms part of an arc.
  • the center line, not shown in the drawing for reasons of clarity, of the region of the borehole 1 which is always shown curved in FIGS. 2 and 5 to 11 has its base point at 26 and an arc center which is located far beyond the right edge of the drawing.
  • ⁇ denotes the angle that opens towards the rotary drill bit 21 between the imaginary connecting line of the center point (coinciding with the base point 26) of the rotary drill bit 21 with the imaginary center point of the borehole at the level of the first stabilization point 22 and an imaginary lower extension of the straight connecting line of the imaginary center points of the borehole 1 at the level of the first and the second stabilization point 22, 25.
  • l denotes the distance between the imaginary center of the second stabilization point 25 and the mentioned center of the rotary drill bit 21.
  • a build-up rate of at least approximately 2 ° / 30 m is preferred, corresponding to a distance of the arc center to the center line of the borehole of approximately 850 m.
  • the rotary drilling tool 2 like all other illustrated or conceivable embodiments according to the invention, has a design which, when drilling the direction of the axis of rotation 19 of the chisel shaft 16, has an orientation to an imaginary straight connecting line 28 between the arc center and the base point 26 of the arcuate center line of the rotary drilling tool specifies drillable borehole 1 at an angle of attack ⁇ of 90 ° as the upper limit.
  • the axis of rotation 19 of the bit shaft 16 forms a tangent to the arcuate center line of the borehole 1 at the level of the base point 26, with the result that the resulting lateral forces on the rotary bit 21 are reduced to a minimum.
  • These side forces are substantially larger in the known devices, because in these the axis of rotation 19 of the chisel shaft 16 forms a secant to the arcuate center line of a borehole drilled during directional drilling with intersections with the center line which lie above the base point 26.
  • the angle of attack ⁇ can also be designed to be slightly smaller than 90 ° and between 89 ° and 90 °. This "lead" can compensate for bending deformations that a rotary drilling tool may possibly introduce when it is inserted into a partially drilled borehole, e.g. experienced in the course of a round trip.
  • a kink 29 is provided between the first and the second stabilization point 22, 25 and a further kink 30 in the area between the rotary drill bit 21 and the first stabilization point 22.
  • both kinks 29, 30 are assigned to the integral housing part 12 assigned to the lower stabilization point 22, and both kinks 29, 30 each have the same direction of kink toward the arc center.
  • the kink 29 is formed in the rotary drilling tool 2 by an inclined upper connecting thread part 31 of the housing part 12 and the second kink 30 from the inclined bearing 17, 18 of the chisel shaft 16 in the housing part 12.
  • the sum of the amounts of both articulation angles corresponds to the amount of the deflection angle ⁇ , and the build-up rate is calculated from both articulation angles.
  • the angular amounts can be divided differently, taking special account of the structural conditions.
  • the kink 29 is preferably used for determining the build-up rate, while the kink 30 mainly takes into account the desired angle of attack ⁇ .
  • the kink angle of the kink 29 can be 1.5 ° and above, while the kink angle of the kink 30 can be, for example, 0.6 ° or less.
  • the design according to the invention can also be implemented with a single kink instead of two or more than two kinks.
  • the provision of several kinks is generally preferable from the structural design of the rotary drilling tool, and the assignment of both kinks to a single housing part 12 provided in the rotary drilling tool 2 simplifies the construction, since all the housing parts 8 to 11 above it can be made in a straight tube shape.
  • FIG. 5 illustrates a second embodiment of a rotary drilling tool 102, in which a further kink 32 is provided between the first stabilization point 22 and the second stabilization point 25 in addition to the kink point 29.
  • the two kink points 29, 30 may have the same kink direction or opposite kink directions as in FIG. 5, the kink point 32 facing away from the arc center of the arcuate center line of the borehole 1 and the kink point 29 facing this drilling center.
  • Such a course of the bending directions reduces or avoids an eccentricity of the imaginary center of the rotary drill bit 21 to an imaginary straight lower extension of the upper part 27 of the main tool axis.
  • Such a course of the buckling direction is also preferable for bores with rotary drill bits 21 with a small diameter and a small free cut.
  • Both kinks 29, 32 are assigned to a housing part 11, which can be designed as an integral, bent-shaped part or can also have a three-part design with inclined threaded connection parts.
  • FIG. 6 illustrates a third embodiment of a rotary drilling tool 202, which is a modification of the rotary drilling tool 2 instead of the kink 29 has another kink 33 between the rotary drill bit 21 and the first stabilization point 22.
  • This further kink 33 like the kink 30, can be designed in accordance with the kinks 29, 30 (FIG. 2).
  • both kinks 30, 33 are assigned to the housing part 12, but the first stabilization point 22 is assigned to the housing part 11.
  • FIG. 7 illustrates a fourth embodiment of a rotary drilling tool 302, which essentially corresponds to that of FIG. 6 with the difference that the kink 33 has an opposite kink direction to the kink 30.
  • the kink 33 has a direction of turning away from the arch center and the lower kink 30 has a kink direction facing the arch center.
  • FIG. 8 illustrates a fifth embodiment of a rotary drilling tool 402, in which only one kink 29 corresponding to the kink 29 of the rotary drilling tool 2 is provided between the stabilization points 22, 25.
  • the lower stabilization point 22 is formed by a stabilizer 424, which has an undersize compared to a stabilizer designed in the normal dimension to a given rotary drill bit 21.
  • the rotary drilling tool 402 is provided with a chisel shaft 16 which is mounted coaxially in the housing part 12.
  • a sixth embodiment of a rotary drilling tool 502 according to FIG. 9 is similar to that according to FIG. 8 with the difference that the lower stabilization point 22 is formed by a stabilizer 524 arranged eccentrically on the housing part 12.
  • the seventh embodiment of a rotary drill bit 602 illustrated in FIG. 10 provides that the first stabilization point 22 is assigned to the rotary drill bit 21 and forms part of the same, for example by the molding of a stabilization part arranged downstream of the cutting part. Otherwise, the rotary drilling tool 602 has a single kink 29 between the two Stabilization points 22, 25, which can correspond structurally to the kink 29 according to FIG. 4.
  • FIG. 11 finally illustrates an eighth embodiment of a rotary drilling tool 702, in which the upper stabilization point 25 is not formed by a pronounced stabilizer of conventional design, but by a stabilization area of the housing 3 or its housing part 8 and at the same time with an undersize compared to a stabilizer designed in normal dimensions, in which the diameter in the limit case can correspond to the diameter of the housing 3 as shown.
  • the rotary drilling tool 702 as in the rotary drilling tool 2 according to FIG. 2, there is a kink 29 in the area between the stabilization points 22, 25 and a kink between the rotary drill bit 21 and the first stabilization point 22, the design of which can correspond to that of the rotary drilling tool 4.
  • Stabilizers with or without undersize, stabilization areas, eccentric stabilizer arrangements, kinks, their number and location, bearings of the chisel shaft 16 in the housing part 12 with a rotational axis offset parallel to the housing axis 20 form all structural parameters that can be combined with one another in order to form a rotary drilling tool
  • an alignment angle ⁇ of 90 ° as the highest limit.
  • kink points that define a predetermined kink angle, as is the case with the inclined bearing 17, 18 of the chisel shaft 16 or with inclined connecting thread parts 31, kink points can also be provided which only develop in directional drilling operation under load in special housing areas on which the kink formation is limited due to a particularly predetermined flexibility.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Bohren eines Bohrlochs mit wahlweisen gerader oder bogenförmiger Mittellinie in unterirdische Gesteinsformationen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for drilling a borehole with a choice of a straight or curved center line in underground rock formations according to the preamble of claim 1.

Vorrichtungen dieser Art, die ohne Werkzeugwechsel zum Navigationsbohren eingesetzt werden, sind in verschiedenen Ausführungen bekannt.Devices of this type, which are used for navigational drilling without changing tools, are known in various designs.

Zur Schaffung eines zugleich für die erzielbare Aufbaurate maßgeblichen Auslenkwinkels für die Drehachse der Meißelwelle beim Richtungsbohren sind bei einer ersten bekannten Vorrichtung (EP-OS 45 444) der erste und der zweite Stabilisator exzentrisch auf einem geradrohrförmig ausgebildeten Gehäuse des Drehbohrwerkzeugs angeordnet. Eine derartige Ausbildung prägt dem Gehäuse im Richtungsbohrbetrieb eine für den Auslenkwinkel maßgebliche Durchbiegung auf.In order to create a deflection angle for the axis of rotation of the chisel shaft during directional drilling, which is also decisive for the build-up rate that can be achieved, in a first known device (EP-OS 45 444) the first and the second stabilizer are arranged eccentrically on a straight tube-shaped housing of the rotary drilling tool. Such a design imprints the housing in the directional drilling operation a deflection that is decisive for the deflection angle.

Bei einer zweiten bekannten Vorrichtung (DE-PS 34 17 743) ist bei konzentrisch auf dem Gehäuse des Drehbohrwerkzeugs angeordneten Stabilisatoren das Gehäuse mit in bezug auf die Werkzeughauptachse ausgelenkten Bereichen versehen, die zwei entgegengesetzt gerichtete, gemeinsam den Auslenkwinkel bestimmende Knickstellen definieren. Gemäß einer weiteren Ausgestaltung dieser Vorrichtung (DE PS 34 23 465) kann die Auslenkung der Gehäusebereiche derart gestaltet sein, daß zwischen den beiden Stabilisatoren lediglich eine einzige Knickstelle den Auslenkwinkel definiert.In a second known device (DE-PS 34 17 743), in the case of stabilizers arranged concentrically on the housing of the rotary drilling tool, the housing is provided with regions which are deflected with respect to the main axis of the tool and which define two oppositely directed kink points which jointly determine the deflection angle. According to a further embodiment of this device (DE PS 34 23 465) the deflection of the housing areas can be designed such that only a single kink defines the deflection angle between the two stabilizers.

Anstelle einer oder zwei Knickstellen im Bereich des Gehäuses zwischen dem ersten und dem zweiten Stabilisator ist bei einer dritten bekannten Vorrichtung der eingangs genannten Art eine Knickstelle zwischen dem Drehbohrmeißel und dem ersten Stabilisator vorgesehen (EP-PS 0 109 699, DE-PS 33 26 855). Diese Knickstelle ist dadurch gebildet, daß die Meißelwelle winklig zur Achse des geradrohrförmig ausgeführten Gehäuses in dessen unteren Bereich gelagert ist und schräg aus dem Gehäuseende austritt.Instead of one or two kinks in the area of the housing between the first and the second stabilizer, a kink between the rotary drill bit and the first stabilizer is provided in a third known device of the type mentioned (EP-PS 0 109 699, DE-PS 33 26 855 ). This kink is formed in that the chisel shaft is mounted at an angle to the axis of the straight tubular housing in the lower region thereof and exits the housing end at an angle.

Bei einer vierten bekannten Vorrichtung (DE-PS 34 06 364), ist die Meißelwelle mit parallel zur Gehäuseachse seitlich versetzter Drehachse im Gehäuse des Drehbohrwerkzeugs gelagert.In a fourth known device (DE-PS 34 06 364), the chisel shaft is mounted in the housing of the rotary drilling tool with an axis of rotation offset laterally parallel to the housing axis.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung gattungsgemäßer Art so zu gestalten, daß deren Drehbohrwerkzeug eine höhere Kursgenauigkeit und bei vermindertem Verschleiß eine höhere Bohrleistung beim Richtungsbohren erbringt.The invention is based on the object of designing a device of the generic type in such a way that its rotary drilling tool provides a higher course accuracy and, with reduced wear, a higher drilling performance when directional drilling.

Diese Aufgabe löst die Erfindung durch eine Vorrichtung mit den Merkmalen des Anspruchs 1. Hinsichtlich wesentlicher weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 17 verwiesen.The invention achieves this object by means of a device having the features of claim 1. With regard to further essential configurations, reference is made to claims 2 to 17.

Bei der erfindungsgemäßen Vorrichtung erhält der Drehbohrmeißel durch die besondere Ausrichtung der Achse seiner Meißelwelle eine von resultierenden Seitenkräften wesentlich entlastete Führung beim Richtungsbohren mit der Folge einer verschleißärmeren Betriebsweise und einer höheren Bohrleistung. Dies gilt insbesondere bei einer Auslegung des Drehbohrwerkzeugs für eine Aufbaurate von 2°/30m und höher. Zugleich damit einher geht die Erzielung einer wesentlich höheren Kursgenauigkeit für den Drehbohrmeißel beim Richtungsbohren nicht nur in einheitlichen Gesteinsformationen, sondern auch in aufeinanderfolgenden unterschiedlichen Gesteinsformationen.In the device according to the invention, the special alignment of the axis of its chisel shaft gives the rotary drill bit a guide which is substantially relieved of the resultant lateral forces during directional drilling, with the consequence of less wear and tear and a higher drilling capacity. This applies in particular when the rotary drilling tool is designed for a build rate of 2 ° / 30m and higher. At the same time this is accompanied by the achievement of a significantly higher course accuracy for the rotary drill bit in directional drilling not only in uniform rock formations, but also in successive different rock formations.

Weitere Einzelheiten und Vorteile ergeben sich aus der nachfolgenden Beschreibung und der Zeichnung, in der mehrere Ausführungsbeispiele des Gegenstands der Erfindung näher veranschaulicht sind. Im einzelnen zeigen:

Fig. 1
eine abgebrochene schematische Seitenansicht einer Vorrichtung zum wahlweisen Geradeaus- und Richtungsbohren mit einem Drehbohrwerkzeug nach der Erfindung während eines Richtbohrvorganges,
Fig. 2
eine schematische Darstellung einer ersten Ausführung eines Drehbohrwerkzeugs nach der Erfindung in einem durch Richtungsbohren erzeugten Bohrloch mit gebogener Mittellinie,
Fig. 3
eine schematische Querschnittsdarstellung des oberen Teils des Drehbohrwerkzeugs nach Fig. 2,
Fig. 4
eine schematische, die Darstellung nach Fig. 3 fortsetzende Querschnittsdarstellung des unteren Teils des Drehbohrwerkzeugs nach Fig. 2, und
Fig. 5 bis 11
schematische Darstellungen ähnlich Fig. 2 zur Veranschaulichung von sieben weiteren Ausführungsformen des Drehbohrwerkzeugs nach der Erfindung.
Further details and advantages result from the following description and the drawing, in which several exemplary embodiments of the object of the invention are illustrated in more detail. In detail show:
Fig. 1
2 shows a broken-away schematic side view of a device for optional straight-ahead and directional drilling with a rotary drilling tool according to the invention during a directional drilling process,
Fig. 2
FIG. 2 shows a schematic illustration of a first embodiment of a rotary drilling tool according to the invention in a borehole produced by directional drilling with a curved center line, FIG.
Fig. 3
2 shows a schematic cross-sectional illustration of the upper part of the rotary drilling tool according to FIG. 2,
Fig. 4
3 shows a schematic cross-sectional representation of the lower part of the rotary drilling tool according to FIG. 2, and
5 to 11
schematic representations similar to FIG. 2 to illustrate seven further embodiments of the rotary drilling tool according to the invention.

Die in Fig. 1 in schematischer Übersichtsdarstellung veranschaulichte Vorrichtung nach der Erfindung umfaßt ein in einem Bohrloch 1 befindliches Drehbohrwerkzeug 2, dessen Gehäuse 3 an seinem oberen Ende mit einem Bohrrohrstrang 4 verbunden ist. Der Bohrrohrstrang 4 ist in einem Drehtisch 5 eines Bohrturms 6 eingespannt. Der Drehtisch 5 ist mit einer Antriebs- und Blockiervorrichtung 7 versehen, mittels der das Spannfutter des Drehtisches 5 und damit der Bohrrohrstrang 4 in kontinuierliche Eigenumdrehung versetzbar oder durch eine begrenzte Drehbewegung ausricht- und anschließend gegen Drehung festlegbar ist.The device according to the invention illustrated in a schematic overview in FIG. 1 comprises a rotary drilling tool 2 located in a borehole 1, the housing 3 of which is connected at its upper end to a drill pipe string 4. The drill pipe string 4 is clamped in a turntable 5 of a drilling tower 6. The turntable 5 is provided with a drive and blocking device 7, by means of which the chuck of the turntable 5 and thus the drill pipe string 4 can be set in continuous self-rotation or aligned and then by a limited rotary movement can be fixed against rotation.

Die in den Fig. 1 bis 4 veranschaulichte erste Ausführung eines Drehbohrwerkzeugs 2 weist ein aus mehreren untereinander verschraubten Teilen oder Sektionen 8,9,10,11,12 bestehendes Gehäuse 3 auf. Der Gehäuseteil 10 ist auf einem Teil seiner Länge als Stator 13 eines Tieflochmotors mit einem Rotor 14 ausgebildet. Der Tieflochmotor 13,14 ist bei dem in Fig. 3 und 4 veranschaulichten Ausführungsbeispiel ein nach dem Moineau-Prinzip arbeitender Verdrängungsmotor, kann jedoch auch von einer Turbine oder einem Motor sonst geeigneter Konstruktion gebildet sein.The first embodiment of a rotary drilling tool 2 illustrated in FIGS. 1 to 4 has a housing 3 consisting of a plurality of parts or sections 8, 9, 10, 11, 12 screwed to one another. The housing part 10 is formed over part of its length as a stator 13 of a deep-hole motor with a rotor 14. The deep-hole motor 13, 14 in the exemplary embodiment illustrated in FIGS. 3 and 4 is a displacement motor operating according to the Moineau principle, but can also be formed by a turbine or a motor of another suitable construction.

Der Rotor 14 ist mittels einer im Gehäuseteil 11 angeordneten Gelenkwelle 15 mit dem oberen Ende einer Meißelewelle 16 verbunden, die in Lagern 17, 18 des einen Lagerstuhl bildenden Gehäuseteils 12 drehbar gelagert ist und bei der Ausführung des Drehbohrwerkzeugs nach Fig. 1 bis 4 eine Drehachse 19 aufweist, die mit der Gehäuseachse 20 des Gehäuseteils 12 einen kleinen Winkel einschließt. Entsprechend dieser Schräglagerung tritt die Meißelwelle 16, die an ihrem äußeren Ende mit einem Drehbohrmeißel 21 versehen ist, schräg aus dem unteren Ende des Gehäuses 3 aus.The rotor 14 is connected by means of an articulated shaft 15 arranged in the housing part 11 to the upper end of a chisel shaft 16, which is rotatably mounted in bearings 17, 18 of the housing part 12 forming a bearing bracket and, in the embodiment of the rotary drilling tool according to FIGS 19 which encloses a small angle with the housing axis 20 of the housing part 12. In accordance with this inclined position, the chisel shaft 16, which is provided with a rotary drill bit 21 at its outer end, emerges obliquely from the lower end of the housing 3.

Das Drehbohrwerkzeug 2 weist in seinem unteren Bereich nahe dem Drehbohrmeißel 21 eine erste Stabilisationsstelle 22 in Gestalt eines auf dem Gehäuseteil 12 angebrachten Stabilisators 24 mit einer Anzahl von über den Umfang verteilten Stabilisatoflügeln oder -rippen auf. Im Abstand über dieser ersten Stabilisationsstelle 22 besitzt das Drehbohrwerkzeug 2 eine zweite Stabilisationsstelle 25, die ebenfalls von einem auf dem Gehäuseteil 8 angeordneten herkömmlichen Stabilisator 24 gebildet ist. Die gedachten Mittelpunkte dieser Stabilisationsstellen 22, 25 definieren zusammen mit einem gedachten Mittelpunkt des Drehbohrmeißels den Verlauf einer gedachten Mittellinie für das Bohrloch 1, die in bei Richtungsbohrarbeiten erbohrten Bereichen des Bohrlochs 1 einen bogenförmigen Verlauf hat, der angenähert Teil eines Kreisbogens bildet.In its lower region near the rotary drill bit 21, the rotary drilling tool 2 has a first stabilization point 22 in the form of a stabilizer 24 attached to the housing part 12 with a number of stabilizer wings or ribs distributed over the circumference. At a distance above this first stabilization point 22, the rotary drilling tool 2 has a second stabilization point 25, which is likewise formed by a conventional stabilizer 24 arranged on the housing part 8. The imaginary centers of these stabilization points 22, 25, together with an imaginary center point of the rotary drill bit, define the course of an imaginary center line for the borehole 1, which has an arcuate course in regions of the borehole 1 drilled during directional drilling work, which approximately forms part of an arc.

Die in der Zeichnung aus Gründen der Übersichtlichkeit nicht näher dargestellte Mittellinie des in den Fig. 2 und 5 bis 11 stets gekrümmt dargestellten Bereich des Bohrloches 1 hat ihren Fußpunkt bei 26 und ein Bogenzentrum, das jeweils weit jenseits des rechten Zeichnungsrandes gelegen ist.The center line, not shown in the drawing for reasons of clarity, of the region of the borehole 1 which is always shown curved in FIGS. 2 and 5 to 11 has its base point at 26 and an arc center which is located far beyond the right edge of the drawing.

Der Abstand des Bogenzentrums von der bogenförmigen Mittellinie eines durch Richtbohren erstellten Bereiches des Bohrlochs 1 bemißt sich nach der Aufbaurate (BUR = 2α/l in °/m), für die das Drehbohrwerkzeug ausgelegt ist. α bezeichnet dabei den sich zum Drehbohrmeißel 21 hin öffnenden Winkel zwischen der gedachten Verbindungslinie des (mit dem Fußpunkt 26 zusammenfallenden) Mittelpunkts des Drehbohrmeißels 21 mit dem gedachten Mittelpunkt des Bohrloches in Höhe der ersten Stabilisationsstelle 22 und einer gedachten unteren Verlängerung der geraden Verbindungslinie der gedachten Mittelpunkte des Bohrloches 1 in Höhe der ersten und der zweiten Stabilisationsstelle 22,25. l bezeichnet den Abstand zwischen dem gedachten Mittelpunkt der zweiten Stabilisationsstelle 25 und dem genannten Mittelpunkt des Drehbohrmeißels 21. Bevorzugt ist eine Aufbaurate von mindestens etwa 2°/30m entsprechend einem Abstand des Bogenzentrums zur Mittellinie des Bohrlochs von etwa 850m.The distance of the arc center from the arc-shaped center line of an area of the borehole 1 created by directional drilling is measured according to the build-up rate (BUR = 2α / l in ° / m) for which the rotary drilling tool is designed. α denotes the angle that opens towards the rotary drill bit 21 between the imaginary connecting line of the center point (coinciding with the base point 26) of the rotary drill bit 21 with the imaginary center point of the borehole at the level of the first stabilization point 22 and an imaginary lower extension of the straight connecting line of the imaginary center points of the borehole 1 at the level of the first and the second stabilization point 22, 25. l denotes the distance between the imaginary center of the second stabilization point 25 and the mentioned center of the rotary drill bit 21. A build-up rate of at least approximately 2 ° / 30 m is preferred, corresponding to a distance of the arc center to the center line of the borehole of approximately 850 m.

Das Drehbohrwerkzeug 2 hat ebenso wie alle weiteren dargestellten bzw. denkbaren Ausführungen nach der Erfindung eine Ausbildung, die beim Richtungsbohren der Drehachse 19 der Meißelwelle 16 eine Ausrichtung zu einer gedachten geraden Verbindungslinie 28 zwischen dem Bogenzentrum und dem Fußpunkt 26 der bogenförmigen Mittellinie des mit dem Drehbohrwerkzeug bohrbaren Bohrlochs 1 unter einem Anstellwinkel β von 90° als oberen Grenzwert vorgibt.The rotary drilling tool 2, like all other illustrated or conceivable embodiments according to the invention, has a design which, when drilling the direction of the axis of rotation 19 of the chisel shaft 16, has an orientation to an imaginary straight connecting line 28 between the arc center and the base point 26 of the arcuate center line of the rotary drilling tool specifies drillable borehole 1 at an angle of attack β of 90 ° as the upper limit.

Bei einer derartigen Ausrichtung bildet die Drehachse 19 der Meißelwelle 16 eine Tangente an die bogenförmige Mittellinie des Bohrlochs 1 in Höhe des Fußpunktes 26 mit der Folge, daß die resultierenden Seitenkräfte auf den Drehbohrmeißel 21 auf ein Mindestmaß reduziert sind. Diese Seitenkräfte sind bei den vorbekannten Vorrichtungen wesentlich größer, denn bei diesen bildet die Drehachse 19 der Meißelwelle 16 eine Sekante zur bogenförmigen Mittellinie eines beim Richtungsbohren erbohrten Bohrlochs mit Schnittpunkten mit der Mittellinie, die oberhalb des Fußpunktes 26 liegen.With such an orientation, the axis of rotation 19 of the bit shaft 16 forms a tangent to the arcuate center line of the borehole 1 at the level of the base point 26, with the result that the resulting lateral forces on the rotary bit 21 are reduced to a minimum. These side forces are substantially larger in the known devices, because in these the axis of rotation 19 of the chisel shaft 16 forms a secant to the arcuate center line of a borehole drilled during directional drilling with intersections with the center line which lie above the base point 26.

Der Anstellwinkel β kann auch geringfügig kleiner als 90° ausgelegt werden und zwischen 89° und 90° liegen. Durch diesen "Vorlauf" können Biegeverformungen ausgeglichen werden, die ein Drehbohrwerkzeug unter Umständen beim Einführen in ein teilweise bereits erbohrtes Bohrloch, z.B. im Zuge eines Roundtrips erfährt.The angle of attack β can also be designed to be slightly smaller than 90 ° and between 89 ° and 90 °. This "lead" can compensate for bending deformations that a rotary drilling tool may possibly introduce when it is inserted into a partially drilled borehole, e.g. experienced in the course of a round trip.

Beim Drehbohrwerkzeug 2 ist zwischen der ersten und der zweiten Stabilisationsstelle 22,25 eine Knickstelle 29 und im Bereich zwischen dem Drehbohrmeißel 21 und der ersten Stabilisationsstelle 22 eine weitere Knickstelle 30 vorgesehen. Bevorzugt sind dabei beide Knickstellen 29,30 (in der von mehreren aneinander grenzenden Teilen definierten Werkzeughauptachse) dem der unteren Stabilisationsstelle 22 zugeordneten integralen Gehäuseteil 12 zugeordnet, und beide Knickstellen 29,30 haben eine gleiche Knickrichtung jeweils zum Bogenzentrum hin.In the rotary drilling tool 2, a kink 29 is provided between the first and the second stabilization point 22, 25 and a further kink 30 in the area between the rotary drill bit 21 and the first stabilization point 22. Preferably, both kinks 29, 30 (in the main tool axis defined by a plurality of adjoining parts) are assigned to the integral housing part 12 assigned to the lower stabilization point 22, and both kinks 29, 30 each have the same direction of kink toward the arc center.

Die Knickstelle 29 wird bei dem Drehbohrwerkzeug 2 durch einen schräggestellten oberen Anschlußgewindeteil 31 des Gehäuseteils 12 und die zweite Knickstelle 30 von der Schräglagerung 17,18 der Meißelwelle 16 im Gehäuseteil 12 gebildet. Die Summe der Beträge beider Knickwinkel entspricht dem Betrag des Auslenkwinkels α, und aus beiden Knickwinkeln errechnet sich die Aufbaurate. Jedoch können bei mehreren Knickstellen die Winkelbeträge unterschiedlich aufgeteilt und dadurch baulichen Gegebenheiten besonders Rechnung getragen werden. Bevorzugt wird die Knickstelle 29 für die Bestimmung der Aufbaurate herangezogen, während die Knickstelle 30 hauptsächlich dem gewünschten Anstellwinkel β Rechnung trägt. So kann beispielsweise der Knickwinkel der Knickstelle 29 1,5° und darüber betragen, während der Knickwinkel der Knickstelle 30 beispielsweise 0,6° oder weniger betragen kann.The kink 29 is formed in the rotary drilling tool 2 by an inclined upper connecting thread part 31 of the housing part 12 and the second kink 30 from the inclined bearing 17, 18 of the chisel shaft 16 in the housing part 12. The sum of the amounts of both articulation angles corresponds to the amount of the deflection angle α, and the build-up rate is calculated from both articulation angles. However, if there are several kinks, the angular amounts can be divided differently, taking special account of the structural conditions. The kink 29 is preferably used for determining the build-up rate, while the kink 30 mainly takes into account the desired angle of attack β. For example, the kink angle of the kink 29 can be 1.5 ° and above, while the kink angle of the kink 30 can be, for example, 0.6 ° or less.

Grundsätzlich ist die erfindungsgemäße Ausbildung statt mit zwei oder mehr als zwei Knickstellen auch mit einer einzigen Knickstelle verwirklichbar. Das Vorsehen mehrerer Knickstellen ist jedoch in der Regel von der baulichen Ausführung des Drehbohrwerkzeugs her zu bevorzugen, und die beim Drehbohrwerkzeug 2 vorgesehene Zuordnung beider Knickstellen zu einem einzigen Gehäuseteil 12 vereinfacht die Bauausführung, da alle darüber befindlichen Gehäuseteile 8 bis 11 geradrohrförmig ausgeführt werden können.Basically, the design according to the invention can also be implemented with a single kink instead of two or more than two kinks. However, the provision of several kinks is generally preferable from the structural design of the rotary drilling tool, and the assignment of both kinks to a single housing part 12 provided in the rotary drilling tool 2 simplifies the construction, since all the housing parts 8 to 11 above it can be made in a straight tube shape.

Die Fig. 5 veranschaulicht eine zweite Ausführung eines Drehbohrwerkzeugs 102, bei der zwischen der ersten Stabilisationsstelle 22 und der zweiten Stabilisationsstelle 25 zusätzlich zur Knickstelle 29 eine weitere Knickstelle 32 vorgesehen ist. Die beiden Knickstellen 29,30 können eine gleiche Knickrichtung oder wie in Fig. 5 zueinander entgegengesetzte Knickrichtungen haben, wobei die Knickstelle 32 eine sich vom Bogenzentrum der bogenförmigen Mittellinie des Bohrloches 1 abwendende und die Knickstelle 29 eine diesem Bohrzentrum zugewandte Knickrichtung aufweist. Ein derartiger Verlauf der Knickrichtungen verringert oder vermeidet eine Exzentrizität des gedachten Mittelpunktes des Drehbohrmeißels 21 zu einer gedachten geraden unteren Verlängerung des oberen Teils 27 der Werkzeughauptachse. Auch ist ein solcher Knickrichtungsverlauf bei Bohrungen mit Drehbohrmeißeln 21 mit kleinem Durchmesser und geringem Freischnitt zu bevorzugen.5 illustrates a second embodiment of a rotary drilling tool 102, in which a further kink 32 is provided between the first stabilization point 22 and the second stabilization point 25 in addition to the kink point 29. The two kink points 29, 30 may have the same kink direction or opposite kink directions as in FIG. 5, the kink point 32 facing away from the arc center of the arcuate center line of the borehole 1 and the kink point 29 facing this drilling center. Such a course of the bending directions reduces or avoids an eccentricity of the imaginary center of the rotary drill bit 21 to an imaginary straight lower extension of the upper part 27 of the main tool axis. Such a course of the buckling direction is also preferable for bores with rotary drill bits 21 with a small diameter and a small free cut.

Im übrigen entspricht die Ausführung nach Fig. 5 im wesentlichen der nach Fig. 4, so daß wie allgemein für übereinstimmende Bauteile auch übereinstimmende Bezugszeichen verwendet werden. Beide Knickstellen 29,32 sind einem Gehäuseteil 11 zugeordnet, das als integrales biegegeformtes Teil ausgeführt sein oder auch eine dreiteilige Ausbildung mit schräggestellten Gewindeanschlußteilen haben kann.5 essentially corresponds to that of FIG. 4, so that, as in general for matching components, matching reference numerals are also used. Both kinks 29, 32 are assigned to a housing part 11, which can be designed as an integral, bent-shaped part or can also have a three-part design with inclined threaded connection parts.

Die Fig. 6 veranschaulicht eine dritte Ausführung eines Drehbohrwerkzeugs 202, das in Abwandlung des Drehbohrwerkzeugs 2 anstelle der Knickstelle 29 eine weitere Knickstelle 33 zwischen dem Drehbohrmeißel 21 und der ersten Stabilisationsstelle 22 aufweist. Diese weitere Knickstelle 33 kann ebenso wie die Knickstelle 30 konstruktiv entsprechend den Knickstellen 29,30 (Fig. 2) ausgeführt sein. Auch hier sind beide Knickstellen 30,33 dem Gehäuseteil 12 zugeordnet, jedoch ist die erste Stabilisationsstelle 22 dem Gehäuseteil 11 zugeordnet.
Die Fig. 7 veranschaulicht eine vierte Ausführung eines Drehbohrwerkzeugs 302, welche im wesentlichen der nach Fig. 6 entspricht mit der Abweichung, daß die Knickstelle 33 eine entgegengesetzte Knickrichtung zur Knickstelle 30 aufweist. Die Knickstelle 33 hat dabei eine sich vom Bogenzentrum abwendende und die untere Knickstelle 30 eine dem Bogenzentrum zugewandte Knickrichtung.6 illustrates a third embodiment of a rotary drilling tool 202, which is a modification of the rotary drilling tool 2 instead of the kink 29 has another kink 33 between the rotary drill bit 21 and the first stabilization point 22. This further kink 33, like the kink 30, can be designed in accordance with the kinks 29, 30 (FIG. 2). Here, too, both kinks 30, 33 are assigned to the housing part 12, but the first stabilization point 22 is assigned to the housing part 11.
FIG. 7 illustrates a fourth embodiment of a rotary drilling tool 302, which essentially corresponds to that of FIG. 6 with the difference that the kink 33 has an opposite kink direction to the kink 30. The kink 33 has a direction of turning away from the arch center and the lower kink 30 has a kink direction facing the arch center.

Die Fig. 8 veranschaulicht eine fünfte Ausführung eines Drehbohrwerkzeugs 402, bei dem zwischen den Stabilisationsstellen 22,25 lediglich eine Knickstelle 29 entsprechend der Knickstelle 29 des Drehbohrwerkzeugs 2 vorgesehen ist. Als zusätzliche Maßnahme ist die untere Stabilisationsstelle 22 von einem Stabilisator 424 gebildet, der ein Untermaß gegenüber einem im Normalmaß zu einem vorgegebenen Drehbohrmeißel 21 ausgeführten Stabilisator aufweist. Im übrigen ist bei der Ausführung nach Fig. 8 das Drehbohrwerkzeug 402 mit einer Meißelwelle 16 versehen, die koaxial im Gehäuseteil 12 gelagert ist.FIG. 8 illustrates a fifth embodiment of a rotary drilling tool 402, in which only one kink 29 corresponding to the kink 29 of the rotary drilling tool 2 is provided between the stabilization points 22, 25. As an additional measure, the lower stabilization point 22 is formed by a stabilizer 424, which has an undersize compared to a stabilizer designed in the normal dimension to a given rotary drill bit 21. 8, the rotary drilling tool 402 is provided with a chisel shaft 16 which is mounted coaxially in the housing part 12.

Eine sechste Ausführung eines Drehbohrwerkzeugs 502 nach Fig. 9 ist der nach Fig. 8 ähnlich mit dem Unterschied, daß die untere Stabilisationsstelle 22 von einem exzentrisch auf dem Gehäuseteil 12 angeordneten Stabilisator 524 gebildet ist.A sixth embodiment of a rotary drilling tool 502 according to FIG. 9 is similar to that according to FIG. 8 with the difference that the lower stabilization point 22 is formed by a stabilizer 524 arranged eccentrically on the housing part 12.

Die in Fig. 10 veranschaulichte siebente Ausführung eines Drehbohrmeißels 602 sieht vor, daß die erste Stabilisationsstelle 22 dem Drehbohrmeißel 21 zugeordnet ist und Bestandteil desselben bildet, z.B. durch die Anformung eines an dem Schneidteil nachgeordneten Stabilisationssteils. Im übrigen weist das Drehbohrwerkzeug 602 eine einzige Knickstelle 29 zwischen den beiden Stabilisationsstellen 22,25 auf, die konstruktiv der Knickstelle 29 gemäß Fig. 4 entsprechen kann.The seventh embodiment of a rotary drill bit 602 illustrated in FIG. 10 provides that the first stabilization point 22 is assigned to the rotary drill bit 21 and forms part of the same, for example by the molding of a stabilization part arranged downstream of the cutting part. Otherwise, the rotary drilling tool 602 has a single kink 29 between the two Stabilization points 22, 25, which can correspond structurally to the kink 29 according to FIG. 4.

Die Fig. 11 schließlich veranschaulicht eine achte Ausführung eines Drehbohrwerkzeugs 702, bei der die obere Stabilisationsstelle 25 nicht von einem ausgeprägten Stabilisator herkömmlicher Ausbildung, sondern von einem Stabilisationsbereich des Gehäuses 3 bzw. dessen Gehäuseteils 8 gebildet ist und dabei zugleich mit einem Untermaß im Vergleich zu einem in Normalmaß ausgeführten Stabilisator ausgeführt ist, bei dem der Durchmesser im Grenzfall wie dargestellt dem Durchmesser des Gehäuses 3 entsprechen kann. Bei dem Drehbohrwerkzeug 702 ist wie beim Drehbohrwerkzeug 2 nach Fig. 2 eine Knickstelle 29 im Bereich zwischen den Stabilisationsstellen 22,25 und eine Knickstelle zwischen dem Drehbohrmeißel 21 und der ersten Stabilisationsstelle 22 vorgesehen, deren konstruktive Ausgestaltung der beim Drehbohrwerkzeug 4 entsprechen kann.11 finally illustrates an eighth embodiment of a rotary drilling tool 702, in which the upper stabilization point 25 is not formed by a pronounced stabilizer of conventional design, but by a stabilization area of the housing 3 or its housing part 8 and at the same time with an undersize compared to a stabilizer designed in normal dimensions, in which the diameter in the limit case can correspond to the diameter of the housing 3 as shown. In the rotary drilling tool 702, as in the rotary drilling tool 2 according to FIG. 2, there is a kink 29 in the area between the stabilization points 22, 25 and a kink between the rotary drill bit 21 and the first stabilization point 22, the design of which can correspond to that of the rotary drilling tool 4.

Stabilisatoren mit oder ohne Untermaß, Stabilisationsbereiche, exzentrische Stabilisatoranordnungen, Knickstellen, deren Zahl und deren Lage, Lagerungen der Meißelwelle 16 im Gehäuseteil 12 mit parallel zur Gehäuseachse 20 versetzt angeordneter Drehachse bilden sämtlich bauliche Parameter, die beliebig miteinander kombiniert werden können, um einem Drehbohrwerkzeug eine erfindungsgemäße Ausbildung mit einem Ausrichtwinkel β von 90° als oberstem Grenzwert zu geben.Stabilizers with or without undersize, stabilization areas, eccentric stabilizer arrangements, kinks, their number and location, bearings of the chisel shaft 16 in the housing part 12 with a rotational axis offset parallel to the housing axis 20 form all structural parameters that can be combined with one another in order to form a rotary drilling tool To give training according to the invention with an alignment angle β of 90 ° as the highest limit.

Anstelle von Knickstellen, die einen vorgegebenen Knickwinkel definieren, wie das bei der Schräglagerung 17,18 der Meißelwelle 16 oder bei schräggestellten Anschlußgewindeteilen 31 der Fall ist, können auch Knickstellen vorgesehen werden, die sich erst im Richtbohrbetrieb unter Belastung in besonderen Gehäusebereichen ausbilden, auf die sich die Knickbildung aufgrund einer besonders vorgegebenen Flexibilität beschränkt.Instead of kink points that define a predetermined kink angle, as is the case with the inclined bearing 17, 18 of the chisel shaft 16 or with inclined connecting thread parts 31, kink points can also be provided which only develop in directional drilling operation under load in special housing areas on which the kink formation is limited due to a particularly predetermined flexibility.

Claims (17)

  1. An apparatus for sinking a bore hole (1) having an optionally straight or arcuate central line into underground rock formations, with a rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702) adapted to be connected to a tubular drill line (4) and with means (5, 7) for driving the tubular drill line (4) in a slow spontaneous rotation for rectilinear drilling and for aligning and fixing the tubular drill line (4) in intrinsic rotation-free manner for directional drilling, the rotary drilling tool (2; 102, 202; 302; 402; 502; 602; 702) comprising a housing (3) in which there is a deep-bore motor (13, 14) and, connected to the rotor (14) of the deep bore motor (13, 14) and carrying a rotary bit (21) at its end which protrudes from the housing (3), a bit shaft (16), the rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702) having a first stabilising position (22) close to the rotary bit (21) and, at a distance above this, at least one second stabilising position (25), and in which, when the rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702) is in operation, when sinking a bore hole (1) having a arcuate central line, the axis of rotation (19) of the bit shaft (16) and the imaginary bottom prolongation of that part of the main tool axis (27) which extends at the height of the second stabilising position (25) enclose a deflection angle (α) which opens up towards the rotary drill bit (21), characterised in that during directional drilling, the axis of rotation (19) of the bit shaft (16) determines with an imaginary straight line (28) an angle of incidence (β) in the range between 89° and 90° as the upper limit value which connects the arc centre of an imaginary portion of an arc of a circle defined by the centre point of the first and of the second stabiliser (22, 25) and of the rotary bit (21), and a base point (26) at which the imaginary arc passes through the bore hole-end surface of the rotary bit (21).
  2. An apparatus according to claim 1, characterised in that the rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702) is designed for an assembly rate of at least 2°/30 m.
  3. An apparatus according to claim 1 or 2, characterised in that there is a kink (29) between the first and second stabilising positions (22, 25) of the rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702).
  4. An apparatus according to one of claims 1 to 3, characterised in that the rotary drilling tool (2) has a kink (30) in the portion between the first stabilising position (22) and the rotary bit (21).
  5. An apparatus according to claims 3 and 4, characterised in that both kinks (29, 30) are associated with an integral housing part (12) which encloses the lower stabilising position.
  6. An apparatus according to claim 5, characterised in that the kink (30) situated between the rotary bit (21) and the first stabilising position (22) is formed by an inclined mounting (17, 18) of the bit shaft (16) while the kink (29) between the first and second stabilising positions (22, 25) is formed by an obliquely positioned upper screw threaded connection part (31) of the integral housing part (12).
  7. An apparatus according to one or more of claims 1 to 6, characterised in that between the first and second stabilising positions (22, 25) there are two kinks (29, 32) in the housing (3) of the rotary drilling tool (102).
  8. An apparatus according to one or more of claims 1 to 7, characterised in that between the first stabilising position (22) and the rotary bit (21) there are two kinks (30, 33).
  9. An apparatus according to claim 7 or 8, characterised in that the direction of bend of the kinks (29, 30; 32, 33) situated between the first and second stabilising positions (22, 25) or first stabilising position (22) and the rotary bit (21) is the same.
  10. An apparatus according to one of claims 7 or 8, characterised in that the direction of bends at the respective kinks (29, 32; 30, 33) situated between the first and second stabilising positions (22, 25) or between the first stabilising position (22) and the rotary bit (21) extend in opposite directions.
  11. An apparatus according to claim 10, characterised in that the respective upper kink (32, 33) bends in a direction away from the centre of the arcuate middle line through a bore hole (1) which is to be sunk while the direction of bend of the lower kink is towards the centre of the arc.
  12. An apparatus according to claim 1 and one or more of claims 2 to 11, characterised in that the first and/or the second stabilising positions (22, 25) is/are formed by a stabiliser (24, 424) disposed on the housing (3) of the rotary drilling tool (2; 102; 202; 302; 402; 502; 602; 702) or by a stabilising portion (725) of the housing (3).
  13. An apparatus according to claim 12, characterised in that the first stabiliser (424) or stabilising portion is under-sized compared with the stabiliser constructed in normal size in relation to a given rotary bit (21).
  14. An apparatus according to claim 13, characterised in that the second stabiliser or stabiliser portion (725) has a diameter the lower limit value of which corresponds to the diameter of the housing (3).
  15. An apparatus according to claim 1 and one or more of claims 2 to 14, characterised in that the first stabilising position (22) is a part of the rotary bit (21).
  16. An apparatus according to claim 1 and one or more of claims 2 to 15, characterised in that the stabiliser (524) or stabilising portion which constitutes the first stabilising position (22) is eccentrically disposed on the housing (3).
  17. An apparatus according to claim 1 and one or more of claims 2 to 16, characterised in that the bit shaft (16) is mounted in the housing (3) in such a way that its axis of rotation (19) is laterally offset in parallel with the housing axis (20).
EP89101615A 1988-02-12 1989-01-31 Apparatus for the random straight or directional drilling into underground formations Expired - Lifetime EP0327925B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804493A DE3804493A1 (en) 1988-02-12 1988-02-12 DEVICE FOR SELECTING STRAIGHT OR DIRECTIONAL DRILLING IN UNDERGROUND STONE INFORMATION
DE3804493 1988-02-12

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EP0327925A1 EP0327925A1 (en) 1989-08-16
EP0327925B1 true EP0327925B1 (en) 1992-12-09

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US (1) US5099931A (en)
EP (1) EP0327925B1 (en)
AU (1) AU617420B2 (en)
CA (1) CA1317929C (en)
DE (1) DE3804493A1 (en)
DK (1) DK61489A (en)
NO (1) NO302770B1 (en)

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Also Published As

Publication number Publication date
US5099931A (en) 1992-03-31
AU2956489A (en) 1989-08-17
CA1317929C (en) 1993-05-18
NO890599L (en) 1989-08-14
NO302770B1 (en) 1998-04-20
DK61489A (en) 1989-08-13
EP0327925A1 (en) 1989-08-16
DE3804493A1 (en) 1989-08-24
NO890599D0 (en) 1989-02-10
DE3804493C2 (en) 1990-01-25
AU617420B2 (en) 1991-11-28
DK61489D0 (en) 1989-02-10

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