EP0412174A1 - Production of bore holes in a given direction - Google Patents

Production of bore holes in a given direction Download PDF

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Publication number
EP0412174A1
EP0412174A1 EP19890114510 EP89114510A EP0412174A1 EP 0412174 A1 EP0412174 A1 EP 0412174A1 EP 19890114510 EP19890114510 EP 19890114510 EP 89114510 A EP89114510 A EP 89114510A EP 0412174 A1 EP0412174 A1 EP 0412174A1
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EP
European Patent Office
Prior art keywords
outer sleeve
drilling
center
course
borehole
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.)
Granted
Application number
EP19890114510
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German (de)
French (fr)
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EP0412174B1 (en
Inventor
Heinrich Sparenberg
Theo Köhler
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.)
BOHRGESELLSCHAFT RHEIN-RUHR MBH
Original Assignee
Bohrgesellschaft Rhein-Ruhr mbH
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Publication date
Application filed by Bohrgesellschaft Rhein-Ruhr mbH filed Critical Bohrgesellschaft Rhein-Ruhr mbH
Priority to EP89114510A priority Critical patent/EP0412174B1/en
Priority to DE58908602T priority patent/DE58908602D1/en
Priority to AT89114510T priority patent/ATE113691T1/en
Publication of EP0412174A1 publication Critical patent/EP0412174A1/en
Application granted granted Critical
Publication of EP0412174B1 publication Critical patent/EP0412174B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/064—Deflecting the direction of boreholes specially adapted drill bits therefor

Definitions

  • the invention relates to the use of a solid drilling tool, which is arranged on a drill pipe and consists of an outer sleeve and a center bit which is detachably fastened therein and which can be removed after loosening through the drill pipe.
  • the solid drilling tool is made up of two Parts, namely the outer sleeve and the center bit, have nothing to do with the course of the borehole. Rather, it serves to enable core drilling without the complete pulling of the drill rod that would otherwise be required to replace the solid drilling tool with a core tube; after removing the center chisel, the core tube can be inserted into the bore through the outer sleeve and fixed in the outer sleeve.
  • the procedure is the same as for one-piece solid drilling tools: inclination and direction of the drilling are measured at predetermined intervals at a considerable distance from or behind the solid drilling tool in the area of non-magnetic drill collars that do not distort the measurement result.
  • the actual course of the borehole at a considerable distance from the bottom of the borehole is only a rough reference for the actual course of the borehole in the area of the borehole bottom and does not provide any information about the tendency of the borehole course in the area of the borehole bottom, so that a reliable statement about the specific measures for further drilling is very difficult, at least requires a lot of experience. All this is the reason why, especially in the case of boreholes deflected from the vertical, major deviations from the actual and target course of the borehole are still unavoidable and the production of such boreholes is very lengthy and cost-intensive.
  • the invention is based on the object of specifying how, within the framework of the measures mentioned at the outset, drilling with a predefined drilling profile is much faster and easier than before.
  • the present invention teaches the use mentioned at the outset, i. H. the use of a solid drilling tool arranged on a drill pipe made of an outer sleeve and detachably fastened therein, after loosening through the drill pipe removable center bit for the purpose of producing holes predefined in the course of the borehole, with the proviso that the actual course of time from time after removal of the center bit Bore is measured at the bottom of the borehole and then drilling continues with a center chisel under drilling conditions acting in the direction of the desired course of the borehole.
  • the invention is based on the finding that the use of the known two-part solid drilling tool in the course of the production of bores is more surprising As a much closer approximation of the actual course of the hole to its target course allows because the actual course can be measured after removing the center bit in the area of the drill base and thus clear statements can be made about the measures to be taken for further drilling. As practice has shown, bores can now be produced much more quickly and cost-effectively, which also means that no anti-magnetic drill collars are required. It is also advantageous that core drilling, in particular rope core drilling, is possible through the outer sleeve without pulling the solid drill pipe, which also contributes to accelerating exploration.
  • the outer sleeve of the full tool is preferably designed as a stabilizer, that is to say provided on its outside with inclined webs.
  • the center chisel can be removed with the aid of the rinsing liquid; However, it is more advantageous if the center chisel can be pulled out of the outer sleeve and through the drill pipe with a rope. From a device and operating point of view, it is particularly simple if the actual course of the bore is measured with the outer sleeve withdrawn by a certain amount together with the full drilling tool using a measuring arrangement that can be anchored in this, with an inclination and direction sensor located in the area of the drilling base.
  • the drilling conditions for further drilling acting in the direction of the desired course of the drilling are known per se; they can by maintaining or changing the speed of the drill string, the pressure of the solid drilling tool and / or the flushing quantity, but in particular can also be achieved in that a corresponding center bit is selected from a set of center bits with different cutting and / or flushing action.
  • the solid drilling tool 1 shown is fastened to a drill pipe 2 which can be driven above ground and consists of an outer sleeve 3 and a center bit 4 which is detachably fastened therein and which can be removed after loosening through the drill pipe 2.
  • the fastening of the center bit 4 in the outer sleeve 3 does not require in particular Description, since corresponding fastening measures 5 are sufficiently known in the prior art.
  • the outer sleeve 3 is in any case designed as a stabilizer, for which purpose webs 6 which run obliquely on the outside are provided.
  • the center chisel 4 can be pulled out with a rope 7 from the outer sleeve 3 and through the drill pipe to the surface, which is only indicated in FIG. 1.
  • the drilling is interrupted from time to time, the solid drilling tool 1 with the drill rod 2 is withdrawn by a certain amount, the center bit 4 is pulled out and a measuring arrangement, not shown in the figures, is inserted into the drill rod 2, which can be found in FIG of the outer sleeve 3 and then has an inclination and direction sensor projecting toward the drilling base 8.
  • a measuring arrangement not shown in the figures, is inserted into the drill rod 2, which can be found in FIG of the outer sleeve 3 and then has an inclination and direction sensor projecting toward the drilling base 8.
  • the actual course of the bore in the area of the borehole bottom 8 is measured.
  • drilling continues in the direction of the target course. They can be the same or different drilling conditions.
  • the latter can e.g. B. can be achieved by using a different center chisel 4 from a set of different center chisels with different cutting and / or rinsing effects.

Abstract

A solid drilling tool (1) which is arranged on a drill-pipe string (2) and consists of an outer sleeve (3) and a centre bit (4) which is detachably fastened in the outer sleeve (3) and can be removed through the drill-pipe string (2) after release is used for producing bore holes in a given direction, in the course of which the actual progress of the bore hole is measured from time to time at the bottom (8) of the bore hole after removal of the centre bit (4), and then drilling is continued with the centre bit (4) under drilling conditions acting in the direction of the desired progress of the bore hole. In this way, the actual progress can be brought substantially closer to the desired progress of the bore hole. <IMAGE>

Description

Die Erfindung betrifft die Verwendung eines an einem Bohrge­stänge angeordneten Vollbohrwerkzeuges aus Außenhülse und darin lösbar befestigtem, nach Lösen durch das Bohrgestänge hindurch entfernbarem Mittelmeißel.The invention relates to the use of a solid drilling tool, which is arranged on a drill pipe and consists of an outer sleeve and a center bit which is detachably fastened therein and which can be removed after loosening through the drill pipe.

Im Rahmen der aus der Praxis bekannten Maßnahmen der genannten Art (vgl. hierzu Prospekt "94 mm WIRELINE CORE BARREL System" der Firma Norton Christensen, Inc., Salt Lake City, Utah/USA - ohne Veröffentlichungsdatum) hat die Ausbildung des Voll­bohrwerkzeuges aus zwei Teilen, nämlich der Außenhülse und dem Mittelmeißel, mit dem Bohrlochverlauf nichts zu tun. Sie dient vielmehr dazu, ein Kernbohren ohne das ansonsten zum Austausch des Vollbohrwerkzeuges gegen ein Kernrohr erforder­liche vollständige Ziehen des Bohrgestänges zu ermöglichen; nach Entfernen des Mittelmeißels kann nämlich das Kernrohr durch die Außenhülse in die Bohrung eingeführt und in der Außenhülse festgelegt werden. Bezüglich des Bohrverlaufes wird wie bei einteiligen Vollbohrwerkzeugen vorgegangen: Nei­gung und Richtung der Bohrung werden in vorgegebenen Zeitab­ständen mit erheblichem Abstand vom bzw. hinter dem Vollbohr­werkzeug im Bereich von das Meßergebnis nicht verfälschenden, antimagnetischen Schwerstangen gemesssen. Der Istverlauf der Bohrung mit erheblichem Abstand von der Bohrlochsohle stellt aber nur einen groben Anhaltswert für den Istverlauf der Bohrung im Bereich der Bohrlochsohle dar und gibt überhaupt keine Auskunft über die Tendenz des Bohrlochverlaufes im Be­reich der Bohrlochsohle, so daß eine zuverlässige Aussage über die im einzelnen für das Weiterbohren zutreffenden Maß­nahmen nur sehr schwer möglich ist, zumindest sehr viel Er­fahrung voraussetzt. Alles das ist der Grund dafür, daß ins­besondere bei aus der Vertikalen abgelenkten Bohrungen grö­ßere Abweichungen von Ist- und Sollverlauf der Bohrung bis heute unvermeidbar sind und das Herstellen solcher Bohrungen sehr langwierig sowie kostenintensiv ist.In the context of the measures of the type mentioned which are known in practice (cf. brochure "94 mm WIRELINE CORE BARREL System" from Norton Christensen, Inc., Salt Lake City, Utah / USA - without a publication date), the solid drilling tool is made up of two Parts, namely the outer sleeve and the center bit, have nothing to do with the course of the borehole. Rather, it serves to enable core drilling without the complete pulling of the drill rod that would otherwise be required to replace the solid drilling tool with a core tube; after removing the center chisel, the core tube can be inserted into the bore through the outer sleeve and fixed in the outer sleeve. With regard to the drilling process, the procedure is the same as for one-piece solid drilling tools: inclination and direction of the drilling are measured at predetermined intervals at a considerable distance from or behind the solid drilling tool in the area of non-magnetic drill collars that do not distort the measurement result. The actual course of the borehole at a considerable distance from the bottom of the borehole is only a rough reference for the actual course of the borehole in the area of the borehole bottom and does not provide any information about the tendency of the borehole course in the area of the borehole bottom, so that a reliable statement about the specific measures for further drilling is very difficult, at least requires a lot of experience. All this is the reason why, especially in the case of boreholes deflected from the vertical, major deviations from the actual and target course of the borehole are still unavoidable and the production of such boreholes is very lengthy and cost-intensive.

Der Erfindung liegt die Aufgabe zugrunde, anzugeben, wie man im Rahmen der eingangs genannten Maßnahmen wesentlich schnel­ler und einfacher als bisher zu Bohrungen mit vorgegebenem Bohrverlauf kommt.The invention is based on the object of specifying how, within the framework of the measures mentioned at the outset, drilling with a predefined drilling profile is much faster and easier than before.

Hierzu lehrt die vorliegende Erfindung die eingangs genannte Verwendung, d. h. die Verwendung eines an einem Bohrgestänge angeordneten Vollbohrwerkzeuges aus Außenhülse und darin lös­bar befestigtem, nach Lösen durch das Bohrgestänge hindurch entfernbarem Mittelmeißel zum Zwecke der Herstellung von im Bohrlochverlauf vorgegebenen Bohrungen und zwar mit der Maß­gabe, daß von Zeit von Zeit nach Entfernen des Mittelmeißels der Istverlauf der Bohrung an der Bohrlochsohle gemessen wird und anschließend mit Mittelmeißel unter in Richtung des Soll­verlaufs der Bohrung wirkenden Bohrbedingungen weitergebohrt wird.To this end, the present invention teaches the use mentioned at the outset, i. H. the use of a solid drilling tool arranged on a drill pipe made of an outer sleeve and detachably fastened therein, after loosening through the drill pipe removable center bit for the purpose of producing holes predefined in the course of the borehole, with the proviso that the actual course of time from time after removal of the center bit Bore is measured at the bottom of the borehole and then drilling continues with a center chisel under drilling conditions acting in the direction of the desired course of the borehole.

Die Erfindung geht hierbei von der Erkenntnis aus, daß die Verwendung des bekannten zweiteiligen Vollbohrwerkzeuges im Zuge der Herstellung von Bohrungen überraschender­ weise eine wesentlich größere Annäherung des Istverlaufs der Bohrung an deren Sollverlauf ermöglicht, weil der Istverlauf nach Entfernen des Mittelmeißels im Bereich der Bohrsohle ge­messen werden kann und damit eindeutige Aussagen über die zu treffenden Maßnahmen für das Weiterbohren gemacht werden können. Wie die Praxis gezeigt hat, können Bohrungen jetzt wesentlich schneller und kostengünstiger hergestellt werden, hierzu trägt auch bei, daß keine antimagnetischen Schwerstan­gen benötigt werden. Vorteilhaft ist auch, daß ohne Ziehen des Vollbohrgestänges ein Kernbohren, insbesondere Seilkern­bohren, durch die Außenhülse hindurch möglich ist, was zur Beschleunigung der Exploration ebenfalls beiträgt.The invention is based on the finding that the use of the known two-part solid drilling tool in the course of the production of bores is more surprising As a much closer approximation of the actual course of the hole to its target course allows because the actual course can be measured after removing the center bit in the area of the drill base and thus clear statements can be made about the measures to be taken for further drilling. As practice has shown, bores can now be produced much more quickly and cost-effectively, which also means that no anti-magnetic drill collars are required. It is also advantageous that core drilling, in particular rope core drilling, is possible through the outer sleeve without pulling the solid drill pipe, which also contributes to accelerating exploration.

Für die weitere Ausgestaltung bestehen im Rahmen der Erfin­dung mehrere Möglichkeiten. So ist die Außenhülse des Voll­werkzeuges vorzugsweise als Stabilicer ausgebildet, d. h. an ihrer Außenseite mit schräg verlaufenden Stegen versehen. Der Mittelmeißel kann mit Hilfe der Spülungsflüssigkeit entfern­bar sein; vorteilhafter ist es jedoch, wenn der Mittelmeißel mit einem Seil aus der Außenhülse und durch das Bohrgestänge herausziehbar ist. In geräte- und bedienungstechnischer Hin­sicht besonders einfach ist es, wenn der Istverlauf der Boh­rung bei um ein bestimmtes Maß samt Vollbohrwerkzeug zurück­gezogener Außenhülse mit einer in dieser verankerbaren Meßan­ordnung mit dann im Bereich der Bohrsohle befindlichem Nei­gungs- und Richtungsfühler gemessen wird. Die in Richtung des Sollverlaufs der Bohrung wirkenden Bohrbedingungen zum Weiter­bohren sind an sich bekannt; sie können durch Beibehaltung bzw. Änderung der Drehzahl des Bohrgestänges, des Andruckes des Vollbohrwerkzeuges und/oder der Spülungsmenge, insbeson­dere aber auch dadurch erreicht werden, daß ein entsprechen­der Mittelmeißel aus einem Satz von Mittelmeißeln mit unter­schiedlicher Schneid- und/oder Spülwirkung ausgewählt wird.There are several possibilities for the further configuration within the scope of the invention. Thus, the outer sleeve of the full tool is preferably designed as a stabilizer, that is to say provided on its outside with inclined webs. The center chisel can be removed with the aid of the rinsing liquid; However, it is more advantageous if the center chisel can be pulled out of the outer sleeve and through the drill pipe with a rope. From a device and operating point of view, it is particularly simple if the actual course of the bore is measured with the outer sleeve withdrawn by a certain amount together with the full drilling tool using a measuring arrangement that can be anchored in this, with an inclination and direction sensor located in the area of the drilling base. The drilling conditions for further drilling acting in the direction of the desired course of the drilling are known per se; they can by maintaining or changing the speed of the drill string, the pressure of the solid drilling tool and / or the flushing quantity, but in particular can also be achieved in that a corresponding center bit is selected from a set of center bits with different cutting and / or flushing action.

Im folgenden wird die Erfindung anhand einer Zeichnung er­läutert. Es zeigen in schematischer Darstellung

  • Fig. 1 ein Bohrgestänge und Vollbohrwerkzeug in einem Bohr­loch,
  • Fig. 2 einen Längsschnitt durch das Vollbohrwerkzeug gemäß Fig. 1.
The invention is explained below with reference to a drawing. They show a schematic representation
  • 1 shows a drill pipe and solid drilling tool in a borehole,
  • FIG. 2 shows a longitudinal section through the solid drilling tool according to FIG. 1.

Das dargestellte Vollbohrwerkzeug 1 ist an einem Übertage drehend antreibbaren Bohrgestänge 2 befestigt und besteht aus einer Außenhülse 3 sowie einem darin lösbar befestigten, nach Lösen durch das Bohrgestänge 2 hindurch entfernbarem Mittel­meißel 4. Die Befestigung des Mittelmeißels 4 in der Außen­hülse 3 bedarf im einzelnen nicht der Beschreibung, da ent­sprechende Befestigungsmaßnahmen 5 im Stand der Technik hin­reichend bekannt sind. Die Außenhülse 3 ist jedenfalls als Stabilicer ausgebildet, wozu außenseitig schräg verlaufende Stege 6 vorgesehen sind. Der Mittelmeißel 4 ist mit einem Seil 7 aus der Außenhülse 3 und durch das Bohrgestänge hin­durch nach Übertage herausziehbar, was in Fig. 1 lediglich angedeutet ist.The solid drilling tool 1 shown is fastened to a drill pipe 2 which can be driven above ground and consists of an outer sleeve 3 and a center bit 4 which is detachably fastened therein and which can be removed after loosening through the drill pipe 2. The fastening of the center bit 4 in the outer sleeve 3 does not require in particular Description, since corresponding fastening measures 5 are sufficiently known in the prior art. The outer sleeve 3 is in any case designed as a stabilizer, for which purpose webs 6 which run obliquely on the outside are provided. The center chisel 4 can be pulled out with a rope 7 from the outer sleeve 3 and through the drill pipe to the surface, which is only indicated in FIG. 1.

Zum Herstellen einer im Bohrlochverlauf vorgegebenen Bohrung wird von Zeit zu Zeit das Bohren unterbrochen, das Vollbohr­werkzeug 1 mit dem Bohrgestänge 2 um ein bestimmtes Maß zu­rückgezogen, der Mittelmeißel 4 herausgezogen und eine in den Figuren nicht dargestellte Meßanordnung in das Bohrgestänge 2 eingelassen, welche sich in der Außenhülse 3 verankert und einen dann zur Bohrsohle 8 hin vorstehenden Neigungs- und Richtungsfühler aufweist. Mit dieser Meßanordnung wird der Istverlauf der Bohrung im Bereich der Bohrlochsohle 8 gemes­sen. Je nach Abweichung vom Sollverlauf wird mit in Richtung des Sollverlaufs wirkenden Bohrbedingungen weitergebohrt. Es können dieselben oder aber auch geänderte Bohrbedingungen sein. Letztere können z. B. durch Verwendung eines anderen Mittelmeißels 4 aus einem Satz verschiedener Mittelmeißel mit unterschiedlicher Schneid- und/oder Spülwirkung erreicht wer­den.To produce a predetermined bore in the course of the borehole, the drilling is interrupted from time to time, the solid drilling tool 1 with the drill rod 2 is withdrawn by a certain amount, the center bit 4 is pulled out and a measuring arrangement, not shown in the figures, is inserted into the drill rod 2, which can be found in FIG of the outer sleeve 3 and then has an inclination and direction sensor projecting toward the drilling base 8. With this measuring arrangement, the actual course of the bore in the area of the borehole bottom 8 is measured. Depending on the deviation from the target course, drilling continues in the direction of the target course. They can be the same or different drilling conditions. The latter can e.g. B. can be achieved by using a different center chisel 4 from a set of different center chisels with different cutting and / or rinsing effects.

Claims (6)

1. Verwendung eines an einem Bohrgestänge (2) angeordneten Vollbohrwerkzeuges (1) aus Außenhülse (3) und darin lösbar befestigtem, nach Lösen durch das Bohrgestänge (2) hindurch entfernbaren Mittelmeißel (4) zum Zwecke der Herstellung von im Bohrlochverlauf vorgegebenen Bohrungen und zwar mit der Maßgabe, daß von Zeit zu Zeit nach Entfernen des Mittelmei­ßels (4) der Istverlauf der Bohrung an der Bohrlochsohle (8) gemessen wird und anschließend mit Mittelmeißel (4) unter in Richtung des Sollverlaufs der Bohrung wirkenden Bohrbedingun­gen weitergebohrt wird.1. Use of a solid drilling tool (1) arranged on a drill pipe (2) made of outer sleeve (3) and detachably fastened therein, after loosening through the drill pipe (2), removable center chisel (4) for the purpose of producing predefined holes in the course of the borehole, specifically with the proviso that from time to time after removal of the center bit (4) the actual course of the bore is measured at the bottom of the borehole (8) and then drilling continues with center bit (4) under drilling conditions acting in the direction of the target course of the bore. 2. Verwendung nach Anspruch 1, wobei die Außenhülse (3) als Stabilicer ausgebildet ist.2. Use according to claim 1, wherein the outer sleeve (3) is designed as a stabilizer. 3. Verwendung nach Anspruch 1 oder 2, wobei der Mittelmeißel (4) mit einem Seil (7) aus der Außenhülse (3) und durch das Bohrgestänge (2) herausziehbar ist.3. Use according to claim 1 or 2, wherein the center chisel (4) with a rope (7) from the outer sleeve (3) and through the drill string (2) can be pulled out. 4. Verwendung nach einem der Ansprüche 1 bis 3, wobei der Istverlauf der Bohrung um ein bestimmtes Maß samt Vollbohr­werkzeug (1) zurückgezogener Außenhülse (3) mit einer in dieser verankerten Meßanordnung mit dann im Bereich der Bohr­lochsohle (8) befindlichem Neigungs- und Richtungsfühler ge­messen wird.4. Use according to one of claims 1 to 3, wherein the actual course of the bore by a certain amount together with the full drilling tool (1) retracted outer sleeve (3) with a measuring arrangement anchored in this, then in the area of the borehole bottom (8), inclination and direction sensor is measured. 5. Verwendung nach einem der Ansprüche 1 bis 4, wobei mit geänderter Drehzahl, geändertem Andruck und/oder geänderter Spülungsmenge weitergebohrt wird.5. Use according to one of claims 1 to 4, wherein drilling continues with changed speed, changed pressure and / or changed flushing quantity. 6. Verwendung nach einem der Ansprüche 1 bis 5, wobei mit einem anderen Mittelmeißel (4) aus einem Satz von Mittel­meißeln (4) mit unterschiedlicher Schneid- und/oder Spülwir­kung weitergebohrt wird.6. Use according to one of claims 1 to 5, wherein with another center chisel (4) from a set of center chisels (4) with different cutting and / or rinsing action.
EP89114510A 1989-08-05 1989-08-05 Production of bore holes in a given direction Expired - Lifetime EP0412174B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP89114510A EP0412174B1 (en) 1989-08-05 1989-08-05 Production of bore holes in a given direction
DE58908602T DE58908602D1 (en) 1989-08-05 1989-08-05 Production of bores specified in the course of the borehole
AT89114510T ATE113691T1 (en) 1989-08-05 1989-08-05 PRODUCTION OF SPECIFIED HOLES IN THE LINE OF THE HOLE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89114510A EP0412174B1 (en) 1989-08-05 1989-08-05 Production of bore holes in a given direction

Publications (2)

Publication Number Publication Date
EP0412174A1 true EP0412174A1 (en) 1991-02-13
EP0412174B1 EP0412174B1 (en) 1994-11-02

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EP89114510A Expired - Lifetime EP0412174B1 (en) 1989-08-05 1989-08-05 Production of bore holes in a given direction

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EP (1) EP0412174B1 (en)
AT (1) ATE113691T1 (en)
DE (1) DE58908602D1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885182A (en) * 1956-09-24 1959-05-05 Driltrol Drilling and deflecting tool
US2894722A (en) * 1953-03-17 1959-07-14 Ralph Q Buttolph Method and apparatus for providing a well bore with a deflected extension
US3241624A (en) * 1963-01-24 1966-03-22 Central Mine Equipment Company Earth boring equipment including two part rotary cutting head
CH459930A (en) * 1964-10-02 1968-07-31 Alkirk Inc Method for steering a shaft drilling machine and shaft drilling machine for carrying out the method
US3635295A (en) * 1969-12-02 1972-01-18 Fenix & Scisson Inc Apparatus for drilling a small borehole downwardly from the bottom of a large borehole
US3945444A (en) * 1975-04-01 1976-03-23 The Anaconda Company Split bit casing drill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894722A (en) * 1953-03-17 1959-07-14 Ralph Q Buttolph Method and apparatus for providing a well bore with a deflected extension
US2885182A (en) * 1956-09-24 1959-05-05 Driltrol Drilling and deflecting tool
US3241624A (en) * 1963-01-24 1966-03-22 Central Mine Equipment Company Earth boring equipment including two part rotary cutting head
CH459930A (en) * 1964-10-02 1968-07-31 Alkirk Inc Method for steering a shaft drilling machine and shaft drilling machine for carrying out the method
US3635295A (en) * 1969-12-02 1972-01-18 Fenix & Scisson Inc Apparatus for drilling a small borehole downwardly from the bottom of a large borehole
US3945444A (en) * 1975-04-01 1976-03-23 The Anaconda Company Split bit casing drill

Also Published As

Publication number Publication date
DE58908602D1 (en) 1994-12-08
EP0412174B1 (en) 1994-11-02
ATE113691T1 (en) 1994-11-15

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