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EP0685630A2 - Mounting apparatus for dual drill pipe - Google Patents

Mounting apparatus for dual drill pipe Download PDF

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Publication number
EP0685630A2
EP0685630A2 EP95104109A EP95104109A EP0685630A2 EP 0685630 A2 EP0685630 A2 EP 0685630A2 EP 95104109 A EP95104109 A EP 95104109A EP 95104109 A EP95104109 A EP 95104109A EP 0685630 A2 EP0685630 A2 EP 0685630A2
Authority
EP
European Patent Office
Prior art keywords
outer tube
inner rod
centering
double
pipe
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.)
Withdrawn
Application number
EP95104109A
Other languages
German (de)
French (fr)
Other versions
EP0685630A3 (en
Inventor
Achim Willmes
Hans Dieter Zeppenfeld
Thomas Wurm
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.)
Ing G Klemm Bohrtechnik GmbH
Original Assignee
Ing G Klemm Bohrtechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ing G Klemm Bohrtechnik GmbH filed Critical Ing G Klemm Bohrtechnik GmbH
Publication of EP0685630A2 publication Critical patent/EP0685630A2/en
Publication of EP0685630A3 publication Critical patent/EP0685630A3/en
Withdrawn legal-status Critical Current

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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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/24—Guiding or centralising devices for drilling rods or pipes
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/20—Combined feeding from rack and connecting, e.g. automatically

Definitions

  • the invention relates to an installation device for connecting double drill pipes consisting of an outer pipe and an inner rod to the end of a double pipe rod.
  • double pipe rods are often used, which consist of double drill pipes joined together in the longitudinal direction.
  • double drill pipes have to be attached to the rear end of the double pipe string in order to extend the drill string.
  • the double drill pipes are attached either by hand or with the aid of a pipe magazine in which the double drill pipes are arranged such that the inner rod is precentered in the outer pipe.
  • Special spacers can be used for pre-centering. Such spacers are very expensive on the one hand and they on the other hand hinder the annular space between the outer tube and inner rod.
  • the invention has for its object to provide an installation device which facilitates the mounting of double drill pipes on the double pipe string of a drill string.
  • a first centering device is provided on the rear end of a beam, which centers the rear ends of the outer tube and inner rod relative to one another when the inner rod protrudes out of the rear end of the outer tube.
  • a second centering device At the front end of the bar there is a second centering device, which initially only holds and centers the front end of the outer tube, while the front end of the inner rod lies eccentrically in the outer tube.
  • the second centering device is provided with a run-on slope, through which the front end of the inner rod is raised when the inner rod is advanced in the outer tube.
  • the double drill pipe is inserted into the drill device in a state in which only the rear end of the inner rod is centered relative to the outer pipe, while the front end of the inner rod is not centered.
  • the rear end of the inner rod can be connected to the coupling device of a rotary drive, which is then pushed forward and takes the inner rod with it.
  • the front end is marked by the chamfer the second centering device raised and also centered in the outer tube.
  • the front end of the inner rod which then protrudes from the front end of the outer tube, can be screwed to the rear end of the inner strand of the double tube rod by rotation by means of the rotary drive.
  • the second centering device is then removed and the outer tube is also advanced with rotation in order to screw it to the outer tube strand of the double tube rod.
  • the installation device according to the invention makes pre-centering unnecessary and enables the attachment of double drill pipes to a double pipe rod, without manual intervention and without manual application of force.
  • double drill pipe encompasses the combination of two pipes lying one inside the other, the inner rod being designed either fully or as a tubular tubular rod. At the ends of the outer tube and inner rod there are threads or other coupling devices with which similar tubes or rods can be connected.
  • the inner rod can also be designed as a auger.
  • an elongated drill carriage 10 which serves as a rail guide for a carriage 11.
  • the carriage 11 carries at its front end (facing the borehole) a rotary drive 12 which drives a coupling device 13 in rotation.
  • the coupling device 13 is used to couple an outer tube of the double drill pipe to the rotary drive 12.
  • a rotary drive 14 for the inner string of the double pipe rod is attached to the slide 11. This rotary drive 14 can be moved in the direction of the double arrow 16 on the carriage 11, so that its distance from the fixed rotary drive 12 can be changed.
  • the coupling tube 15 extends through the rotary drive 12 and the coupling device 13 and protrudes from the front end of the coupling device 13.
  • a drill guide 17 for guiding the double pipe rod and a clamping device 18 with (not shown) hydraulic cylinders for holding the double pipe rod against rotation.
  • Fig. 1 the rear end of the double pipe linkage 19 is shown.
  • This consists of outer tubes 20 placed one behind the other and inner rods 21 running coaxially therein, an annular space being provided between the outer tube 20 and inner rod 21 for backwashing the drill material.
  • Fig. 1 the carriage 11 is shown in its retracted position on the drill carriage 10.
  • the double drill pipe 19 has been advanced and a double drill pipe 22 is attached to this double drill pipe 19 in order to extend the double pipe pipe.
  • the double drill pipe 22 is fastened to the installation device 23, from which it is held in the position required for mounting on the double pipe linkage 19.
  • the double tube linkage 22 consists of the outer tube 24 and the inner rod 25, which has the same length as the outer tube 24.
  • the mounting device 23 is shown in FIGS. 2 to 4 shown in detail. It has an elongated bar 26 which is suspended from a carrying device 27.
  • the carrying device 27 here consists of two ropes which are attached to a crane. One rope is suspended in one of numerous holes 28 in the beam 26 in order to be able to change the angle of inclination of the beam 26. In the state shown in FIG. 2, the bar 26 runs horizontally.
  • the carriage 10 is normally pivotally attached to a crawler vehicle. By adjusting the angle of inclination of the beam 26, the angle of inclination of the mounting device can be adapted to that of the drilling mount 10.
  • first centering device 30 At the rear end of the beam 26 there is a first centering device 30.
  • This has two clamping jaws 31, 32 which are pivotably attached to the beam 26 via joints 33.
  • the clamping jaws 31, 32 are two-armed levers, the outer lever arms of which are connected by a piston-cylinder unit 34. If the piston-cylinder unit 34 is extended, the clamping jaws 31, 32 are pressed against one another.
  • the clamping jaws 31, 32 each have a tube section 35, which engages around the end of the outer tube 24, and a centering shoulder 36, which engages around the rear end of the inner rod 25 protruding from the outer tube 24 and clamps it in order to prevent axial displacement of the inner rod 25.
  • the second centering device 37 which likewise has two clamping jaws 38, 39 which can be swung apart and which together enclose and center the front end of the outer tube 24.
  • the jaws 38, 39 can be pivoted about joints 40. They are designed as two-armed levers and a piston-cylinder unit 41 acts on their rear lever arms in order to either press the clamping jaws 38, 39 against one another or to open them.
  • the clamping jaws 38, 39 each have a tubular centering section 42 for the outer tube 24.
  • a conical area is provided which forms the run-on slope 43.
  • This run-up slope 43 opens into the centering area 44 for the inner rod 25.
  • the double drill pipe 22 is fastened to the installation device 23 in the manner shown in FIG. 2 by inserting the ends of the outer pipe 24 into the centering devices 30 and 37, the clamping jaws of which are then closed.
  • the inner rod 25 is offset in the longitudinal direction with respect to the outer tube 24, in that its rear end protrudes from the outer tube 24, while the front end lies loosely and eccentrically in the outer tube.
  • the angle a which form the axes of the outer tube and inner rod, is so small because of the great length of the tubes that the coupling tube 15 can be screwed onto the thread 50 of the inner tube, although these tubes are not exactly aligned with one another.
  • pivotable support devices 46 are located, which can be brought into a working position in order to support the outer tube 24 from below. While the outer pipe 24 rests on the support devices 46, the centering devices 30 and 37 are opened and the installation device is removed from the double drill pipe 22. Now the carriage 11 is advanced until the coupling device 13, which is rotated by the rotary drive 12, comes into engagement with the thread at the rear end of the outer tube 24 and rotates the outer tube with further advance. The outer tube 24 is screwed onto the outer tube 20 of the double tube linkage 19. The double drill pipe 22 is now part of the double pipe linkage 19 and this is driven by the rotary drives 12 and 14, while the carriage 11 is advanced along the drill carriage 10 in order to effect further drilling.
  • the length of the beam 26 corresponds essentially to the length of the double drill pipe 22.
  • the centering devices 30 and 37 which are each geared to a specific combination of the outer pipe 24 and the inner rod 25, can be replaced in accordance with the diameter of the drill pipes.

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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)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Abstract

The double bore tube (22) comprises an outer tube (24) and an inner rod (25) with the end of a double tube rod. A beam (26) is provided which at one end has a first centering device for centering the outer tube together with centering and clamping of the end of the inner rod extending out of the outer tube. At the other end is a second centering device (37) for centering the outer tube. This has a run-in incline (43) by which the end of the inner rod can be raised, when the inner rod is pushed into the outer tube. <IMAGE>

Description

Die Erfindung betrifft eine Einbauvorrichtung zum Verbinden von aus einem Außenrohr und einer Innenstange bestehenden Doppel-Bohrrohren mit dem Ende eines Doppelrohrgestänges.The invention relates to an installation device for connecting double drill pipes consisting of an outer pipe and an inner rod to the end of a double pipe rod.

Bei Erdbohrungen werden häufig Doppelrohrgestänge eingesetzt, die aus in Längsrichtung aneinandergesetzten Doppel-Bohrrohren bestehen. Dabei müssen, wenn das Doppelrohrgestänge in das Erdreich hinein vorgetrieben ist, Doppel-Bohrrohre an das rückwärtige Ende des Doppelrohrgestänges angesetzt werden, um den Bohrstrang zu verlängern. Das Ansetzen der Doppel-Bohrrohre erfolgt im Stand der Technik entweder von Hand oder mit Hilfe eines Rohrmagazins, in dem die Doppel-Bohrrohre derart angeordnet sind, daß jeweils die Innenstange in dem Außenrohr vorzentriert ist. Für die Vorzentrierung können spezielle Abstandhalter verwendet werden. Solche Abstandhalter sind einerseits sehr aufwendig und sie behindern andererseits den Ringraum zwischen Außenrohr und Innenstange.In the case of earth bores, double pipe rods are often used, which consist of double drill pipes joined together in the longitudinal direction. When the double pipe string is driven into the ground, double drill pipes have to be attached to the rear end of the double pipe string in order to extend the drill string. In the prior art, the double drill pipes are attached either by hand or with the aid of a pipe magazine in which the double drill pipes are arranged such that the inner rod is precentered in the outer pipe. Special spacers can be used for pre-centering. Such spacers are very expensive on the one hand and they on the other hand hinder the annular space between the outer tube and inner rod.

Der Erfindung liegt die Aufgabe zugrunde, eine Einbauvorrichtung zu schaffen, die das Anbauen von Doppel-Bohrrohren an das Doppelrohrgestänge eines Bohrstranges erleichtert.The invention has for its object to provide an installation device which facilitates the mounting of double drill pipes on the double pipe string of a drill string.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den im Patentanspruch 1 angegebenen Merkmalen.This object is achieved according to the invention with the features specified in claim 1.

Bei der erfindungsgemäßen Einbauvorrichtung ist an dem rückwärtigen Ende eines Balkens eine erste Zentriervorrichtung vorgesehen, die die rückwärtigen Enden von Außenrohr und Innenstange relativ zueinander zentriert, wenn die Innenstange aus dem rückwärtigen Ende des Außenrohres heraus vorsteht. An dem vorderen Ende des Balkens befindet sich eine zweite Zentriervorrichtung, die zunächst nur das vordere Ende des Außenrohres festhält und zentriert, während das vordere Ende der Innenstange exzentrisch im Außenrohr liegt. Die zweite Zentriervorrichtung ist mit einer Anlaufschräge versehen, durch die das vordere Ende der Innenstange angehoben wird, wenn die Innenstange im Außenrohr vorgeschoben wird. Mit der Einbauvorrichtung wird das Doppel-Bohrrohr in einem Zustand in die Bohrvorrichtung eingesetzt, in dem nur das rückwärtige Ende der Innenstange relativ zum Außenrohr zentriert ist, während das vordere Ende der Innenstange unzentriert ist. Das rückwärtige Ende der Innenstange kann mit der Kupplungsvorrichtung eines Drehantriebes verbunden werden, der anschließend vorgeschoben wird und dabei die Innenstange mitnimmt. Beim Vorschieben der Innenstange wird deren vorderes Ende durch die Anlaufschräge der zweiten Zentriervorrichtung angehoben und im Außenrohr ebenfalls zentriert. Das dann aus dem vorderen Ende des Außenrohres vorstehende vordere Ende der Innenstange kann unter Drehung durch den Drehantrieb mit dem rückwärtigen Ende des Innenstranges des Doppelrohrgestänges verschraubt werden. Anschließend wird die zweite Zentriervorrichtung entfernt und das Außenrohr unter Drehung ebenfalls vorgeschoben, um es mit dem Außenrohrstrang des Doppelrohrgestänges zu verschrauben. Die erfindungsgemäße Einbauvorrichtung macht eine Vorzentrierung entbehrlich und ermöglicht das Ansetzen von Doppel-Bohrrohren an ein Doppelrohrgestänge, ohne manuelle Eingriffe und ohne manuelle Kraftausübung.In the installation device according to the invention, a first centering device is provided on the rear end of a beam, which centers the rear ends of the outer tube and inner rod relative to one another when the inner rod protrudes out of the rear end of the outer tube. At the front end of the bar there is a second centering device, which initially only holds and centers the front end of the outer tube, while the front end of the inner rod lies eccentrically in the outer tube. The second centering device is provided with a run-on slope, through which the front end of the inner rod is raised when the inner rod is advanced in the outer tube. With the installation device, the double drill pipe is inserted into the drill device in a state in which only the rear end of the inner rod is centered relative to the outer pipe, while the front end of the inner rod is not centered. The rear end of the inner rod can be connected to the coupling device of a rotary drive, which is then pushed forward and takes the inner rod with it. When the inner rod is pushed forward, the front end is marked by the chamfer the second centering device raised and also centered in the outer tube. The front end of the inner rod, which then protrudes from the front end of the outer tube, can be screwed to the rear end of the inner strand of the double tube rod by rotation by means of the rotary drive. The second centering device is then removed and the outer tube is also advanced with rotation in order to screw it to the outer tube strand of the double tube rod. The installation device according to the invention makes pre-centering unnecessary and enables the attachment of double drill pipes to a double pipe rod, without manual intervention and without manual application of force.

Der Begriff Doppel-Bohrrohr umfaßt die Kombination zweier ineinanderliegender Rohre, wobei die Innenstange entweder voll oder als hohle Rohrstange rohrförmig ausgebildet ist. An den Enden von Außenrohr und Innenstange befinden sich Gewinde oder andere Kupplungseinrichtungen, mit denen gleichartige Rohre bzw. Stangen verbunden werden können. Die Innenstange kann auch als Bohrschnecke ausgebildet sein.The term double drill pipe encompasses the combination of two pipes lying one inside the other, the inner rod being designed either fully or as a tubular tubular rod. At the ends of the outer tube and inner rod there are threads or other coupling devices with which similar tubes or rods can be connected. The inner rod can also be designed as a auger.

Im folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained with reference to the drawings.

Es zeigen:

Fig. 1
eine schematische Seitenansicht einer Bohrlafette mit einem Schlitten zum Vorschieben von Doppel-Bohrrohren,
Fig. 2
einen Längsschnitt, der in Verbindung mit der Bohrlafette verwendeten Einbauvorrichtung,
Fig. 3
eine Stirnansicht der Einbauvorrichtung aus Richtung der Pfeile III-III von Fig. 2, und
Fig. 4
einen Schnitt entlang der Linie IV-IV von Fig. 2, jedoch nach dem Zentrieren des vorderen Endes der Innenstange bei auseinandergeschwenkten Klemmbacken.
Show it:
Fig. 1
1 shows a schematic side view of a drill carriage with a slide for advancing double drill pipes,
Fig. 2
a longitudinal section of the mounting device used in connection with the drill carriage,
Fig. 3
a front view of the mounting device from the direction of arrows III-III of Fig. 2, and
Fig. 4
a section along the line IV-IV of Fig. 2, but after centering the front end of the inner rod with the jaws pivoted apart.

Gemäß Fig. 1 ist eine langgestreckte Bohrlafette 10 vorgesehen, die als Schienenführung für einen Schlitten 11 dient. Der Schlitten 11 trägt an seinem vorderen (dem Bohrloch zugewandten) Ende einen Drehantrieb 12, welcher eine Kupplungseinrichtung 13 drehend antreibt. Die Kupplungseinrichtung 13 dient zum Ankoppeln eines Außenrohres des Doppelbohrgestänges an den Drehantrieb 12. Ferner ist auf dem Schlitten 11 ein Drehantrieb 14 für den Innenstrang des Doppelrohrgestänges angebracht. Dieser Drehantrieb 14 kann in Richtung des Doppelpfeiles 16 auf dem Schlitten 11 verfahren werden, so daß sein Abstand zu dem feststehenden Drehantrieb 12 verändert werden kann. Das Kupplungsrohr 15 erstreckt sich durch den Drehantrieb 12 und die Kupplungsvorrichtung 13 hindurch und ragt aus dem vorderen Ende der Kupplungsvorrichtung 13 heraus.1, an elongated drill carriage 10 is provided, which serves as a rail guide for a carriage 11. The carriage 11 carries at its front end (facing the borehole) a rotary drive 12 which drives a coupling device 13 in rotation. The coupling device 13 is used to couple an outer tube of the double drill pipe to the rotary drive 12. Furthermore, a rotary drive 14 for the inner string of the double pipe rod is attached to the slide 11. This rotary drive 14 can be moved in the direction of the double arrow 16 on the carriage 11, so that its distance from the fixed rotary drive 12 can be changed. The coupling tube 15 extends through the rotary drive 12 and the coupling device 13 and protrudes from the front end of the coupling device 13.

Am vorderen Ende der Bohrlafette 10 befindet sich eine Bohrführung 17 zum Führen des Doppelrohrgestänges sowie eine Klemmvorrichtung 18 mit (nicht dargestellten) Hydraulikzylindern zum Festhalten des Doppelrohrgestänges gegen Drehung.At the front end of the drill carriage 10 there is a drill guide 17 for guiding the double pipe rod and a clamping device 18 with (not shown) hydraulic cylinders for holding the double pipe rod against rotation.

In Fig. 1 ist das rückwärtige Ende des Doppelrohrgestänges 19 dargestellt. Dieses besteht aus hintereinandergesetzten Außenrohren 20 und koaxial darin verlaufenden Innenstangen 21, wobei zwischen Außenrohr 20 und Innenstange 21 ein Ringraum zum Rückspülen des Bohrgutes vorgesehen ist.In Fig. 1, the rear end of the double pipe linkage 19 is shown. This consists of outer tubes 20 placed one behind the other and inner rods 21 running coaxially therein, an annular space being provided between the outer tube 20 and inner rod 21 for backwashing the drill material.

In Fig. 1 ist der Schlitten 11 in seiner Rückzugsposition auf der Bohrlafette 10 dargestellt. Das Doppelbohrgestänge 19 ist vorgeschoben worden und an dieses Doppelbohrgestänge 19 wird ein Doppel-Bohrrohr 22 angesetzt, um das Doppelrohrgestänge zu verlängern. Hierzu ist das Doppel-Bohrrohr 22 an der Einbauvorrichtung 23 befestigt, von der es in der zum Anbauen an das Doppelrohrgestänge 19 erforderlichen Position gehalten wird. Das Doppelrohrgestänge 22 besteht aus dem Außenrohr 24 und der Innenstange 25, die die gleiche Länge hat wie das Außenrohr 24.In Fig. 1 the carriage 11 is shown in its retracted position on the drill carriage 10. The double drill pipe 19 has been advanced and a double drill pipe 22 is attached to this double drill pipe 19 in order to extend the double pipe pipe. For this purpose, the double drill pipe 22 is fastened to the installation device 23, from which it is held in the position required for mounting on the double pipe linkage 19. The double tube linkage 22 consists of the outer tube 24 and the inner rod 25, which has the same length as the outer tube 24.

Die Einbauvorrichtung 23 ist in den Fign. 2 bis 4 im einzelnen dargestellt. Sie weist einen langgestreckten Balken 26 auf, der an einer Tragvorrichtung 27 aufgehängt ist. Die Tragvorrichtung 27 besteht hier aus zwei Seilen, die an einen Kran angehängt sind. Das eine Seil ist in eines von zahlreichen Löchern 28 des Balkens 26 eingehängt, um den Neigungswinkel des Balkens 26 verändern zu können. In dem in Fig. 2 dargestellten Zustand verläuft der Balken 26 horizontal. Die Lafette 10 ist normalerweise schwenkbar an einem Raupenfahrzeug angebracht. Durch Verstellen des Neigungswinkels des Balkens 26 kann der Neigungswinkel der Einbauvorrichtung an denjenigen der Bohrlafette 10 angepaßt werden.The mounting device 23 is shown in FIGS. 2 to 4 shown in detail. It has an elongated bar 26 which is suspended from a carrying device 27. The carrying device 27 here consists of two ropes which are attached to a crane. One rope is suspended in one of numerous holes 28 in the beam 26 in order to be able to change the angle of inclination of the beam 26. In the state shown in FIG. 2, the bar 26 runs horizontally. The carriage 10 is normally pivotally attached to a crawler vehicle. By adjusting the angle of inclination of the beam 26, the angle of inclination of the mounting device can be adapted to that of the drilling mount 10.

An dem rückwärtigen Ende des Balkens 26 befindet sich eine erste Zentriervorrichtung 30. Diese weist zwei Klemmbacken 31,32 auf, die über Gelenke 33 an dem Balken 26 schwenkbar angebracht sind. Die Klemmbacken 31,32 sind zweiarmige Hebel, deren äußere Hebelarme durch eine Kolbenzylindereinheit 34 verbunden sind. Wird die Kolbenzylindereinheit 34 ausgefahren, dann werden die Klemmbacken 31,32 gegeneinandergedrückt. Die Klemmbacken 31,32 weisen jeweils einen Rohrabschnitt 35 auf, der das Ende des Außenrohres 24 umgreift, und eine Zentrierschulter 36, die das rückwärtige Ende der aus dem Außenrohr 24 vorstehenden Innenstange 25 umgreift und festspannt um ein axiales Verschieben der Innenstange 25 zu verhindern.At the rear end of the beam 26 there is a first centering device 30. This has two clamping jaws 31, 32 which are pivotably attached to the beam 26 via joints 33. The clamping jaws 31, 32 are two-armed levers, the outer lever arms of which are connected by a piston-cylinder unit 34. If the piston-cylinder unit 34 is extended, the clamping jaws 31, 32 are pressed against one another. The clamping jaws 31, 32 each have a tube section 35, which engages around the end of the outer tube 24, and a centering shoulder 36, which engages around the rear end of the inner rod 25 protruding from the outer tube 24 and clamps it in order to prevent axial displacement of the inner rod 25.

An dem vorderen Ende des Balkens 26 befindet sich die zweite Zentriervorrichtung 37, die ebenfalls zwei auseinanderschwenkbare Klemmbacken 38,39 aufweist, welche gemeinsam das vordere Ende des Außenrohres 24 umschließen und zentrieren. Die Klemmbacken 38,39 sind um Gelenke 40 herum schwenkbar. Sie sind als zweiarmige Hebel ausgebildet und an ihren rückwärtigen Hebelarmen greift eine Kolbenzylindereinheit 41 an, um die Klemmbacken 38,39 entweder gegeneinander zu drücken, oder zu öffnen.At the front end of the beam 26 there is the second centering device 37, which likewise has two clamping jaws 38, 39 which can be swung apart and which together enclose and center the front end of the outer tube 24. The jaws 38, 39 can be pivoted about joints 40. They are designed as two-armed levers and a piston-cylinder unit 41 acts on their rear lever arms in order to either press the clamping jaws 38, 39 against one another or to open them.

Die Klemmbacken 38,39 weisen jeweils einen rohrförmigen Zentrierabschnitt 42 für das Außenrohr 24 auf. In Verlängerung des Zentrierabschnitts 42 ist ein konischer Bereich vorgesehen, der die Anlaufschräge 43 bildet. Diese Anlaufschräge 43 mündet in den Zentrierbereich 44 für die Innenstange 25.The clamping jaws 38, 39 each have a tubular centering section 42 for the outer tube 24. In the extension of the centering section 42, a conical area is provided which forms the run-on slope 43. This run-up slope 43 opens into the centering area 44 for the inner rod 25.

Nachfolgend wird die Benutzung der Einbauvorrichtung 23 beschrieben.The use of the installation device 23 is described below.

Das Doppel-Bohrrohr 22 wird an der Einbauvorrichtung 23 in der in Fig. 2 dargestellten Weise befestigt, indem die Enden des Außenrohres 24 in die Zentriervorrichtungen 30 und 37 eingesetzt werden, deren Klemmbacken daraufhin geschlossen werden. Die Innenstange 25 ist dabei in Bezug auf das Außenrohr 24 in Längsrichtung versetzt, in dem ihr rückwärtiges Ende aus dem Außenrohr 24 herausragt, während das vordere Ende lose und exzentrisch im Außenrohr liegt. Hierbei ist der Winkel a, den die Achsen von Außenrohr und Innenstange bilden, wegen der großen Länge der Rohre so klein, daß an das Gewinde 50 des Innenrohres das Kupplungsrohr 15 angeschraubt werden kann, obwohl diese Rohre nicht ganz exakt zueinander ausgerichtet sind. Der Drehantrieb 14 wird also gemäß Fig. 1 zusammen mit dem Kupplungsrohr 15 auf dem Schlitten 11 vorgeschoben und das vordere Ende des Kupplungsrohres 15 wird an das rückwärtige Ende der Innenstange 25 angeschraubt, indem der Drehantrieb 14 das Kupplungsrohr 15 dreht. Wenn dieser Verschraubungsvorgang dadurch beendet ist, daß die Gewinde von Kupplungsrohr 15 und Innenstange 25 sich gegen einen Anschlag festgezogen haben, wird das Vorschieben des Drehantriebs 14 auf dem Schlitten 11 fortgesetzt, wodurch die Innenstange 25 relativ zum Außenrohr 24 vorgeschoben wird. Dabei läuft das vordere Ende der Innenstange 25 auf die Anlaufschräge 43 der zweiten Zentriervorrichtung 37 auf, und das Innenrohr 25 gelangt in die in Fig. 2 dargestellte Zentrierposition 25a, wobei nunmehr das vordere Ende der Innenstange 25 aus dem vorderen Ende des Außenrohres 24 herausragt. Mit dem Drehantrieb 14 wird dann die Innenstange 25 an das rückwärtige Ende der Innenstange 21 des Doppelrohrgestänges 19 angeschraubt.The double drill pipe 22 is fastened to the installation device 23 in the manner shown in FIG. 2 by inserting the ends of the outer pipe 24 into the centering devices 30 and 37, the clamping jaws of which are then closed. The inner rod 25 is offset in the longitudinal direction with respect to the outer tube 24, in that its rear end protrudes from the outer tube 24, while the front end lies loosely and eccentrically in the outer tube. Here, the angle a, which form the axes of the outer tube and inner rod, is so small because of the great length of the tubes that the coupling tube 15 can be screwed onto the thread 50 of the inner tube, although these tubes are not exactly aligned with one another. 1 together with the coupling tube 15 on the carriage 11 and the front end of the coupling tube 15 is screwed to the rear end of the inner rod 25 by the rotary actuator 14 rotating the coupling tube 15. When this screwing process is completed by the fact that the threads of the coupling tube 15 and inner rod 25 have tightened against a stop, the advancement of the rotary drive 14 on the carriage 11 is continued, whereby the inner rod 25 is advanced relative to the outer tube 24. The front end of the inner rod 25 runs onto the run-on slope 43 of the second centering device 37, and the inner tube 25 arrives in the centering position 25a shown in FIG. 2, the front end of the inner rod 25 now protruding from the front end of the outer tube 24. The inner rod 25 is then turned on with the rotary drive 14 screwed the rear end of the inner rod 21 of the double pipe linkage 19.

Auf der Lafette 10 befinden sich gemäß Fig. 1 verschwenkbare Tragvorrichtungen 46, die in eine Arbeitsposition gebracht werden können, um das Außenrohr 24 von unten her abzustützen. Während das Außenrohr 24 auf den Stützvorrichtungen 46 ruht, werden die Zentriervorrichtungen 30 und 37 geöffnet und die Einbauvorrichtung wird von dem Doppel-Bohrrohr 22 entfernt. Nun wird der Schlitten 11 vorgeschoben bis die Kupplungsvorrichtung 13, die von dem Drehantrieb 12 gedreht wird, mit dem Gewinde am rückwärtigen Ende des Außenrohres 24 in Eingriff kommt und das Außenrohr unter weiterem Vorschub dreht. Dabei wird das Außenrohr 24 an das Außenrohr 20 des Doppelrohrgestänges 19 angeschraubt. Das Doppel-Bohrrohr 22 ist nunmehr Bestandteil des Doppelrohrgestänges 19 und dieses wird durch die Drehantriebe 12 und 14 angetrieben, während der Schlitten 11 entlang der Bohrlafette 10 vorgeschoben wird, um den weiteren Bohrvortrieb zu bewirken.1, pivotable support devices 46 are located, which can be brought into a working position in order to support the outer tube 24 from below. While the outer pipe 24 rests on the support devices 46, the centering devices 30 and 37 are opened and the installation device is removed from the double drill pipe 22. Now the carriage 11 is advanced until the coupling device 13, which is rotated by the rotary drive 12, comes into engagement with the thread at the rear end of the outer tube 24 and rotates the outer tube with further advance. The outer tube 24 is screwed onto the outer tube 20 of the double tube linkage 19. The double drill pipe 22 is now part of the double pipe linkage 19 and this is driven by the rotary drives 12 and 14, while the carriage 11 is advanced along the drill carriage 10 in order to effect further drilling.

Die Länge des Balkens 26 entspricht im wesentlichen der Länge des Doppel-Bohrrohrs 22. Die Zentriervorrichtungen 30 und 37, die jeweils auf eine bestimmte Kombination von Außenrohr 24 und Innenstange 25 abgestellt sind, können entsprechend dem Durchmesser der Bohrrohre ausgewechselt werden.The length of the beam 26 corresponds essentially to the length of the double drill pipe 22. The centering devices 30 and 37, which are each geared to a specific combination of the outer pipe 24 and the inner rod 25, can be replaced in accordance with the diameter of the drill pipes.

Claims (6)

Einbauvorrichtung zum Verbinden von aus einem Außenrohr (24) und einer Innenstange (25) bestehenden Doppel-Bohrrohres (22) mit dem Ende eines Doppelrohrgestänges (19), mit einem Balken (26), der an einem Ende eine erste Zentriervorrichtung (13) zum Zentrieren des Außenrohres (24) sowie Zentrieren und Klemmen des aus dem Außenrohr (24) vorstehenden Endes der Innenstange (25) aufweist, und am anderen Ende eine zweite Zentriervorrichtung (37) zum Zentrieren des Außenrohres (24), wobei die zweite Zentriervorrichtung (37) eine Anlaufschräge (43) aufweist, durch die das Ende der Innenstange (25) angehoben wird, wenn die Innenstange (25) in dem Außenrohr (24) vorgeschoben wird.Installation device for connecting an outer tube (24) and an inner rod (25) consisting of double drill pipe (22) to the end of a double pipe linkage (19), with a bar (26) having a first centering device (13) at one end Centering the outer tube (24) and centering and clamping the end of the inner rod (25) projecting from the outer tube (24), and at the other end a second centering device (37) for centering the outer tube (24), the second centering device (37 ) has a run-on slope (43) through which the end of the inner rod (25) is raised when the inner rod (25) is advanced in the outer tube (24). Einbauvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die erste Zentriervorrichtung (30) zwei auseinanderbewegbare Klemmbacken (31,32) für das Außenrohr (24) aufweist, die mit Zentrier- und Klemmschultern (36) für die Innenstange (25) versehen sind.Installation device according to Claim 1, characterized in that the first centering device (30) has two clamping jaws (31, 32) for the outer tube (24) which can be moved apart and which are provided with centering and clamping shoulders (36) for the inner rod (25). Einbauvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zweite Zentriervorrichtung (37) zwei auseinanderbewegbare Klemmbacken (38,39) für das Außenrohr (24) aufweist, an denen die Anlaufschräge (43) für die Innenstange (25) vorgesehen ist.Installation device according to claim 1 or 2, characterized in that the second centering device (37) has two clamping jaws (38, 39) for the outer tube (24) which can be moved apart and on which the run-on slope (43) for the inner rod (25) is provided. Einbauvorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Klemmbacken (31,32;38,39) von einer Kolbenzylindereinheit (34;41) schwenkbar angetrieben ist.Installation device according to claim 2 or 3, characterized in that the clamping jaws (31,32; 38,39) are pivotally driven by a piston-cylinder unit (34; 41). Einbauvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß an der zweiten Zentriervorrichtung (37) die Anlaufschräge (43) in Verlängerung desjenigen Längenbereichs (42) angeordnet ist, der das Außenrohr (24) zentriert.Installation device according to one of claims 1 to 4, characterized in that on the second centering device (37) the run-on slope (43) is arranged in an extension of that length range (42) which centers the outer tube (24). Einbauvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Balken (26) an einer Tragvorrichtung (27) derart angebracht ist, daß sein Neigungswinkel in Bezug auf die Horizontale veränderbar ist.Installation device according to one of claims 1 to 5, characterized in that the beam (26) is attached to a carrying device (27) in such a way that its angle of inclination can be varied with respect to the horizontal.
EP95104109A 1994-06-01 1995-03-21 Mounting apparatus for dual drill pipe. Withdrawn EP0685630A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9408942U 1994-06-01
DE9408942U DE9408942U1 (en) 1994-06-01 1994-06-01 Installation device for double drill pipes

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EP0685630A2 true EP0685630A2 (en) 1995-12-06
EP0685630A3 EP0685630A3 (en) 1997-04-02

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WO2006061459A1 (en) * 2004-12-07 2006-06-15 Sandvik Mining And Construction Oy Method for casing drilling, drilling unit and adapter device
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Also Published As

Publication number Publication date
DE9408942U1 (en) 1995-02-09
EP0685630A3 (en) 1997-04-02

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