EP0768446B1 - Method and boring tool for drilling into subterranean formations - Google Patents

Method and boring tool for drilling into subterranean formations Download PDF

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Publication number
EP0768446B1
EP0768446B1 EP95115867A EP95115867A EP0768446B1 EP 0768446 B1 EP0768446 B1 EP 0768446B1 EP 95115867 A EP95115867 A EP 95115867A EP 95115867 A EP95115867 A EP 95115867A EP 0768446 B1 EP0768446 B1 EP 0768446B1
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EP
European Patent Office
Prior art keywords
drilling tool
outer casing
bore hole
drilling
formation
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
EP95115867A
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German (de)
French (fr)
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EP0768446A1 (en
Inventor
Friedhelm Dipl.-Ing. Makohl
Carsten Dipl.-Ing. Vogt
Pudjihanto Surwano
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Baker Hughes Holdings LLC
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Baker Hughes Inc
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Filing date
Publication date
Application filed by Baker Hughes Inc filed Critical Baker Hughes Inc
Priority to DE59508569T priority Critical patent/DE59508569D1/en
Priority to EP95115867A priority patent/EP0768446B1/en
Priority to NO19964272A priority patent/NO311046B1/en
Priority to US08/729,226 priority patent/US5845722A/en
Publication of EP0768446A1 publication Critical patent/EP0768446A1/en
Priority to US09/205,969 priority patent/US6196336B1/en
Application granted granted Critical
Publication of EP0768446B1 publication Critical patent/EP0768446B1/en
Anticipated expiration legal-status Critical
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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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Definitions

  • the invention relates to a method and an apparatus for Drilling a well into underground formations with at least one layer-like special formation that is adjacent to one in the direction of the sink Formation has significantly different formation pressures.
  • the invention addresses the problem, a method and a drilling device to create the above drawbacks when drilling wells into underground formations with significant formation pressure differences avoid.
  • the invention solves the problem by a method according to claim 1 and by a drill according to claim 9. With regard to essential Further refinements are made to claims 2 to 8 to 10 to 19.
  • the outer housing forms a shield for Formation that avoids the occurrence of tributaries as well as that Push formation areas towards drilling tool and pipe string.
  • the invention improves the above-mentioned effect of the outer housing by a drill bit is driven at the end of the outer housing, the shielding outer casing surrounds the directional drilling tool and with this works together as a unit.
  • the drilling rig schematically illustrated in Fig. 1 for sinking a Drilling into underground formations includes an above-ground derrick 1 with conventional equipment, one of which is screwed into a borehole 2 Pipe sections assembled pipe string 3, whose lower end in the usual way via connection thread with a drilling tool 4 is connected.
  • a compensation and pressure device 6 thruster
  • a compensation and pressure device 6 be screwed in between, with the help of mainly thermal ones Length differences while maintaining or specifying a desired one M adoptedeland pressure force can be compensated.
  • the drilling tool 4 comprises a composed of screwed pipe sections Tool housing 7 and one housed therein, only schematically indicated downhole motor 8 of any suitable, known training, the output shaft 9 at its lower end with a Drill bit 10 is screwed.
  • the system shown in Fig. 1 further comprises a pipe string 3 and that Drilling tool 4 surrounding outer housing 11, one of pipe sections composite well casing (liner or casing) forms and via a connecting device 12 (liner hanger) at its upper end can be connected to the pipe string 3.
  • This connecting device 12 provides a detachable connection with the tubing string 3 and allows one with the pipe string 3 retracting and pulling together the outer housing 11 in the borehole 2 or from this.
  • the tool housing 7 is in the area of the lower end of the upper Main part 13 of the outer housing 11 by an upper group 14 of locking members supported against downward movement, and the drive shaft 9 is in the area of a thickened section 15 by a lower group 16 of locking members with a lower separate end part 17 of the outer housing 11, which is independently rotatable at a lower end portion 18 of the main part 13 of the outer housing 11 is mounted and with the Drive shaft 9 around the common longitudinal central axis 19 of the drill can.
  • the lower end part 17 carries a drill bit 20 on the end face thereof Cutting plane approximately at the level of the cutting plane of the drill bit 10 Starting position.
  • the upper group 14 of the locking members is one in the outer housing 11 trained locking groove 21 in the form of an outwardly shaped annular Bag and formed by locking bars 22 on the tool housing 7 fixed by means of screws 23 at one end and with their free part a lowered starting position by the action of a spring 24 in a locking position are elastically deflectable, in which the locking bars 22 into the locking grooves 21 engage non-rotatably.
  • the locking bars 22 are in the illustrated Attach their top end with their free bottom end the pocket bottom 21 '; with possible fastening of the ledges 22 at its lower end is supported by a projection of the Engagement part 25 at the upper free end of the locking bars 22 on the pocket bottom 21 '.
  • the locking bars 22 are stressed in this case. At least three bars are provided, which regularly over the The circumference of the outer housing 11 and the tool housing 7 is arranged distributed are.
  • the lower group 16 of the locking members is in the lower end part 17 of the Outer housing 11 formed, longitudinal locking grooves 26 in shape from pockets shaped to the outside and from thickened Section 15 of the drive shaft 9 of the deep hole motor 8 by means of screws 23 fixed locking bars 27 formed, which also from a lowered starting position elastic by the action of a spring 28 in a locking position are deflectable, in the engaging parts 29 of the locking bars 27 into the locking grooves 26 intervene.
  • the lower group 16 comprises at least three pairs of Locking grooves 26 and locking strips 27, which are equiangular over the circumference of Outer housing 11 and drive shaft 9 are arranged distributed. Instead of shown attachment of the locking bars 27 with an overhead fastening point and the lower free end can also be used with the upper free end Be attached at the end and bottom of the attachment point.
  • the upper group 14 executed with an engagement length that is shorter than that Engagement length of the engagement parts 29 of the locking bars 27 of the lower group 16. This ensures that the engaging parts 29 of the locking bars 27 of the lower group 16 only in the locking grooves 26 intended for them the lower Group 16 can come up with.
  • the locking grooves 26 of the lower group 16 have an engagement length that is greater than that of the engaging parts 29 of the locking bars 27 of the lower group 16. This ensures that the lower end portion 17 of the outer housing 11 in shift in the axial direction relative to the drive shaft 9 between two end positions can, as illustrated in Figs. 2 and 3.
  • a bearing sleeve 30 is provided which from above into the lower end part 17 of the Inserted outer housing 11 and firmly connected to it, e.g. screwed is.
  • the lower end portion 18 of the upper body 13 of the outer case 11 engages around the bearing sleeve 30 and forms with a bearing surface 31 on its inside a plain bearing coaxial with the longitudinal central axis 19 of the drilling device.
  • the bearing sleeve 30 is in the lower end section 18 of the upper Main part 13 of the outer housing 11 is axially displaceably supported, so the lower end part 17, the above-mentioned axial mobility between 2 and the drilling operating position 3 to enable.
  • the bearing sleeve 30 has a collar 32 on the outside, the as a stop in cooperation with a shoulder 33 above the bearing surface 31 the lower end position for the lower end part 17 of the outer housing 11 defined.
  • the drilling operating position is the lower End of the locking ledges 27 defined with a counter surface 34 as a stop interact, which in the example shown from the end face of the screwed lower portion 35 of the lower end portion 17 of the outer housing 11 is formed, which in the overlying upper portion 36 of the lower end portion 17 of the outer housing 11 is screwed.
  • the drive shaft 9 of the deep hole motor 8 with one section 39 increased flexibility in the form of a circumferential, the bending resistance lowering confiscation, that of the downstream one Part of the drive shaft 9 gives an all-round elastic deflectability.
  • the flexible section 39 is when the drilling tool 4 in its lower end position in the outer housing 11, slightly below the Bend 40, on which the longitudinal central axis 19 of the drill in the angled lower axis part 19 'merges.
  • any type of bit can be used as the drill bit 10.
  • the drill bit 10 is provided with a stabilizer part 10 ' which is the inside of the lower portion 35 of the lower end part 17 is closely spaced, and has a side cutting surface that for example, by grinding, has a high accuracy of fit and with can fit through the drill bit 20.
  • first part of a borehole 2 with Drilled using a normal drilling tool similar to drilling tool 4 the through any, e.g. first formation formed by slate up to the vicinity of the border area to a downstream area Special formation descends, in which the formation pressure is much higher or less than that in the area of the first formation.
  • This first Formation with largely the same first formation pressure can be essentially one have a homogeneous structure, but can also consist of several different ones There are partial formations between which there are no significant ones Formation pressure differences exist.
  • the drilling tool 4 is set down and locked in the outer housing 11 is, the upper end of the outer housing 11 by means of the connecting device 12, which may be of any suitable, known design, connected to tubing string 3 and then out of the rig support solved.
  • the unit of parts 3, 4 and 11 thus formed is now under further construction of the pipe string 3 in the first part of the borehole 2 further retracted until drill bit 10 and drill bit 11 reach the bottom of borehole 2 to reach.
  • the drilling tool 4 is then put into operation, what happens by switching on or starting the deep hole motor 8, for example by training as a turbine or Moineau motor is put into operation with drilling fluid. This is done by the central Flushing channel 41 in the drill string supplied from above and occurs Flow through the central flushing channel 41 from the face of the drill bit 10 in the borehole 2 to subsequently in the annulus between the drill and to flow back into the borehole wall above ground.
  • the tubular string 3 becomes tubular Carried outer housing 11, wherein by rotating the drill bit 20 on lower end of the outer housing 11 this in turn like a drilling tool works.
  • the outer housing 11 lines the borehole in the region of its length 2 off, absorbs inward formation forces as soon as these, for example become effective when the pressure drops in the drilling fluid, and causes a waterproofing that may be perfected by cementing can be.
  • the drilling tool can be loosened the connecting device 12 and the bore, for example can be used as a production well after being fully lined. Is the borehole extends far beyond the special formation can give after pulling the previously connected to the outer housing 11 Bohrwerkmaschines4 a second drilling tool with a pipe string into it Borehole are retracted, which can be passed through the offset outer housing are and can take over the further drilling of the hole. If there is further sinking at a considerable distance from the first Special formation Another special formation to be pierced, a second one Drilling rig with a second outer housing are used, that can be passed through the stepped first outer housing. The sequence the drilling process with the second drill is then analogous to that the above-described process.
  • the upper main part 13 of the outer housing 11 is advantageously by the Pipe string 3 for the purpose of reducing friction or to guide the straight line Drilling tool 4 set in rotation. If the outer housing 11 with a Angled in its lower area and the drill thus closed Directional drilling operations can be used after determining the direction course of the angled part of the outer housing 11 this through the Pipe string 3 is secured against twisting from above ground, which means that in the event of further Drilling progress a part of the borehole that has been changed in its direction is drilled.

Description

Die Erfindung bezieht sich auf ein Verfahren und auf eine Vorrichtung zum Abteufen einer Bohrung in unterirdische Formationen mit zumindest einer schichtförmigen Sonderformation, die zu einer in Abteufrichtung benachbarten Formation erheblich unterschiedliche Formationsdrücke aufweist.The invention relates to a method and an apparatus for Drilling a well into underground formations with at least one layer-like special formation that is adjacent to one in the direction of the sink Formation has significantly different formation pressures.

Trifft eine Bohrung, die zunächst in einer ersten Formation mit einem ersten Formationsdruck abgeteuft wird, auf eine zweite Formation mit erheblich niedrigerem Formationsdruck, beispielsweise auf eine poröse Schicht, wie sie für Gas- und/oder Oellagerstätten typisch ist, dann fällt, gegebenenfalls schlagartig, der Druck in der Bohrspülung ab mit der Folge, daß der zuvor im Ringraum herrschende Druckausgleich zwischen dem Formationsdruck der ersten Formation und dem Druck der Bohrsprülung entfällt und sich zumindest Bereiche der ersten Formation sich an den Rohrstrang anlegen und diesen festsetzen können, was mit einem Verlust der Bohrung und der Hauptteile des Bohrgeräts einhergeht. Meets a hole that is initially in a first formation with a first Formation pressure is sunk to a second formation with significantly lower Formation pressure, for example on a porous layer, as for Gas and / or oil deposits is typical, then suddenly falls, if necessary, the pressure in the drilling fluid, with the result that the pressure in the annulus prevailing pressure balance between the formation pressure of the first formation and the pressure of the drilling fluid is eliminated and at least areas of the first formation lay down on the pipe string and fix it can what with a loss of the hole and the main parts of the drill goes along.

Trifft eine Bohrung, die zunächst in einer ersten Formation mit einem ersten Formationdruck abgeteuft wird, auf eine Formation mit wesentlich höherem Formationsdruck, dann entsteht die Gefahr von Zuflüssen formationseigener Medien in die Bohrspülung, durch die Bohrspülung aus dem Ringraum und dem Rohrstrang oberirdisch herausgedrückt werden kann. Wird das Gewicht der Bohrspülung erhöht, was durch Einleitung von Schwerspat oder Eisenoxid zur Bohrspülung vorgenommen werden kann, um für den hohen Druck der angebohrten Formation einen Ausgleich zu schaffen, dann treten in der ersten-Bohrspülungsverluste auf.Meets a hole that is initially in a first formation with a first Formation pressure is sunk to a formation with much higher Formation pressure, then there is a risk of inflows from the formation Media into the drilling fluid, through the drilling fluid from the annulus and the pipe string can be pushed out above ground. Will the weight The drilling fluid increases, which is due to the introduction of heavy spar or iron oxide for drilling fluid can be made in order for the high pressure of the drilled Formation to create a balance, then occur in the first drilling fluid losses on.

Die Erfindung befaßt sich mit dem Problem, ein Verfahren und ein Bohrgerät zu schaffen, welche die vorstehenden Nachteile beim Abteufen von Bohrungen in unterirdische Formationen mit erheblichen Formationsdruckunterschieden vermeiden. Die Erfindung löst das Problem durch ein Verfahren gemäß Anspruch 1 und durch ein Bohrgerät gemäß Anspruch 9. Hinsichtlich wesentlicher weiterer Ausgestaltungen wird auf die Ansprüche 2 bis 8 bis 10 bis 19 verwiesen.The invention addresses the problem, a method and a drilling device to create the above drawbacks when drilling wells into underground formations with significant formation pressure differences avoid. The invention solves the problem by a method according to claim 1 and by a drill according to claim 9. With regard to essential Further refinements are made to claims 2 to 8 to 10 to 19.

Aus jedem der Dokumente DE-C-3902868, EP-A-0462618 ist bekannt, daß ein Außengehäuse gleichzeitig und gleichförmig mit dem Richtbohrwerkzeug vorgetrieben und das vordere Ende des Außengehäuses durch den vorderen Teil des Richtbohrwerkzeugs ausgerichtet wird.From each of documents DE-C-3902868, EP-A-0462618 it is known that a The outer casing is driven simultaneously and uniformly with the directional drilling tool and the front end of the outer housing through the front part of the directional drilling tool is aligned.

Durch das Mitführen eines Außengehäuses (Liner oder Casing) nimmt dieses die Formationsdrücke auf, so daß das Bohrgerät betriebsbereit und die Bohrung weiterbenutzbar bleiben. Das Außengehäuse bildet eine Abschirmung zur Formation hin, die das Auftreten von Zuflüssen ebenso vermeidet wie das Heranschieben von Formationsbereichen an Bohrwerkzeug und Rohrstrang.By carrying an outer casing (liner or casing) this takes the formation pressures so that the drill is operational and the drilling remain usable. The outer housing forms a shield for Formation that avoids the occurrence of tributaries as well as that Push formation areas towards drilling tool and pipe string.

Die Erfindung verbessert die genannte Wirkung des Außengehäuses, indem eine Bohrkrone am Ende des Außengehäuses angetrieben wird, wobei das abschirmende Außengehäuse das Richtbohrwerkzeug umgibt und mit diesem als Einheit zusammenwirkt.The invention improves the above-mentioned effect of the outer housing by a drill bit is driven at the end of the outer housing, the shielding outer casing surrounds the directional drilling tool and with this works together as a unit.

Weitere Einzelheiten und Vorteile ergeben sich aus der nachfolgenden Beschreibung des erfindungsgemäßen Verfahrens und des erfindungsgemäßen Bohrwerkzeugs, das in der Zeichnung in zwei Ausführungen näher veranschaulicht ist. In der Zeichnung zeigen:

Fig. 1
eine schematische Gesamtdarstellung einer Bohranlage mit einem Bohrgerät erfindungsgemäßer Ausbildung,
Fig. 2
einen Längsschnitt durch ein Bohrwerkzeug erster Ausführung in einer unteren Endstellung in einem unteren Abschnitt eines Außengehäuses, aufgeteilt in zwei aneinander anschließende Teildarstellungen,
Fig. 3
eine Darstellung ähnlich Fig. 2 zur Veranschaulichung des unteren Endteils des Außengehäuses in Bohrbetriebsstellung,
Fig. 4
eine einteilige Darstellung von Außengehäuse und Bohrwerkzeug nach Fig. 2 mit zwei Ausschnittvergrößerungen, und
Fig. 5
eine Darstellung ähnlich Fig. 2 einer zweiten Ausführung des Bohrwerkzeugs nach der Erfindung.
Further details and advantages result from the following description of the method according to the invention and the drilling tool according to the invention, which is illustrated in more detail in the drawing in two versions. The drawing shows:
Fig. 1
1 shows a schematic overall representation of a drilling rig with a drilling device of the design according to the invention,
Fig. 2
2 shows a longitudinal section through a drilling tool of the first embodiment in a lower end position in a lower section of an outer housing, divided into two adjoining partial representations,
Fig. 3
2 shows a representation of the lower end part of the outer housing in the drilling operating position,
Fig. 4
a one-part representation of the outer housing and drilling tool of FIG. 2 with two enlargements, and
Fig. 5
a representation similar to FIG. 2 of a second embodiment of the drilling tool according to the invention.

Die in Fig. 1 schematisch veranschaulichte Bohranlage für das Abteufen einer Bohrung in unterirdische Formationen umfaßt einen oberirdischen Bohrturm 1 mit üblicher Ausrüstung, von dem sich in ein Bohrloch 2 ein aus verschraubten Rohrabschnitten zusammengesetzter Rohrstrang 3 heraberstreckt, dessen unteres Ende in üblicher Weise über Anschlußgewinde mit einem Bohrwerkzeug 4 verbunden ist. Dabei kann wie dargestellt zwischen dem Rohrstrangende 5 und dem Bohrwerkzeug 4 eine Ausgleichs- und Druckvorrichtung 6 (thruster) zwischengeschraubt sein, mit deren Hilfe vornehmlich thermisch bedingte Längendifferenzen unter Aufrechterhaltung bzw. Vorgabe einer gewünschten Meißelandruckkraft ausgeglichen werden können. The drilling rig schematically illustrated in Fig. 1 for sinking a Drilling into underground formations includes an above-ground derrick 1 with conventional equipment, one of which is screwed into a borehole 2 Pipe sections assembled pipe string 3, whose lower end in the usual way via connection thread with a drilling tool 4 is connected. Here, as shown, between the end of the pipe string 5 and the drilling tool 4 a compensation and pressure device 6 (thruster) be screwed in between, with the help of mainly thermal ones Length differences while maintaining or specifying a desired one Meißeland pressure force can be compensated.

Das Bohrwerkzeug 4 umfaßt ein aus verschraubten Rohrabschnitten zusammengesetztes Werkzeuggehäuse 7 und einen in diesem untergebrachten, lediglich schematisch angedeuteten Tieflochmotor 8 irgendeiner geeigneten, bekannten Ausbildung, dessen Abtriebswelle 9 an ihrem unteren Ende mit einem Bohrmeißel 10 verschraubt ist.The drilling tool 4 comprises a composed of screwed pipe sections Tool housing 7 and one housed therein, only schematically indicated downhole motor 8 of any suitable, known training, the output shaft 9 at its lower end with a Drill bit 10 is screwed.

Die in Fig. 1 gezeigte Anlage umfaßt ferner ein den Rohrstrang 3 und das Bohrwerkzeug 4 umgebendes Außengehäuse 11, das eine aus Rohrabschnitten zusammengesetzte Bohrlochauskleidung (Liner oder Casing) bildet und über eine Verbindungsvorrichtung 12 (liner hanger) an seinem oberen Ende mit dem Rohrstrang 3 verbindbar ist. Diese Verbindungsvorrichtung 12 stellt eine auflösbare Verbindung mit dem Rohrstrang 3 her und ermöglicht ein mit dem Rohrstrang 3 gemeinsames Einfahren und Aufziehen des Außengehäuses 11 in das Bohrloch 2 bzw. aus diesem.The system shown in Fig. 1 further comprises a pipe string 3 and that Drilling tool 4 surrounding outer housing 11, one of pipe sections composite well casing (liner or casing) forms and via a connecting device 12 (liner hanger) at its upper end can be connected to the pipe string 3. This connecting device 12 provides a detachable connection with the tubing string 3 and allows one with the pipe string 3 retracting and pulling together the outer housing 11 in the borehole 2 or from this.

Das Werkzeuggehäuse 7 ist im Bereich des unteren Endes des oberen Hauptteils 13 des Außengehäuses 11 durch eine obere Gruppe 14 von Riegelgliedern gegen Abwärtsbewegung gesichert abgestützt, und die Antriebswelle 9 ist im Bereich eines verdickten Abschnitts 15 durch eine untere Gruppe 16 von Riegelgliedern mit einem unteren gesonderten Endteil 17 des Außengehäuses 11 verbunden, das unabhängig drehbar an einem unteren Endabschnitt 18 des Hauptteils 13 des Außengehäuses 11 gelagert ist und mit der Antriebswelle 9 um die gemeinsame Längsmittelachse 19 des Bohrgeräts umlaufen kann. Das untere Endteil 17 trägt stirnseitig eine Bohrkrone 20, deren Schneidebene eine etwa in Höhe der Schneidebene des Bohrmeißels 10 gelegene Ausgangsstellung einnimmt. The tool housing 7 is in the area of the lower end of the upper Main part 13 of the outer housing 11 by an upper group 14 of locking members supported against downward movement, and the drive shaft 9 is in the area of a thickened section 15 by a lower group 16 of locking members with a lower separate end part 17 of the outer housing 11, which is independently rotatable at a lower end portion 18 of the main part 13 of the outer housing 11 is mounted and with the Drive shaft 9 around the common longitudinal central axis 19 of the drill can. The lower end part 17 carries a drill bit 20 on the end face thereof Cutting plane approximately at the level of the cutting plane of the drill bit 10 Starting position.

Die obere Gruppe 14 der Riegelglieder wird von einer im Außengehäuse 11 ausgebildeten Riegelnut 21 in Form einer von nach außen ausgeformten ringförmigen Tasche und von Riegelleisten 22 gebildet, die am Werkzeuggehäuse 7 mittels Schrauben 23 an einem Ende festgelegt und mit ihrem freien Teil aus einer versenkten Ausgangsstellung durch Wirkung einer Feder 24 in eine Riegelstellung elastisch auslenkbar sind, in der die Riegelleisten 22 in die Riegelnuten 21 verdrehfest eingreifen. Dabei liegen die Riegelleisten 22 bei der dargestellten Befestigung ihres oberen Endes mit ihrem freien unteren Ende auf dem Taschenboden 21' auf; bei auch möglicher Befestigungs der Riegelleisten 22 an ihrem unteren Ende erfolgt die Abstützung durch einen Vorsprung des Eingriffsteils 25 am oberen freien Ende der Riegelleisten 22 auf dem Taschenboden 21'. Die Riegelleisten 22 werden in diesem Falle auf Zug beansprucht. An Riegelleisten 22 sind zumindest drei vorgesehen, die regelmäßig über den Umfang des Außengehäuses 11 bzw. des Werkzeuggehäuses 7 verteilt angeordnet sind.The upper group 14 of the locking members is one in the outer housing 11 trained locking groove 21 in the form of an outwardly shaped annular Bag and formed by locking bars 22 on the tool housing 7 fixed by means of screws 23 at one end and with their free part a lowered starting position by the action of a spring 24 in a locking position are elastically deflectable, in which the locking bars 22 into the locking grooves 21 engage non-rotatably. The locking bars 22 are in the illustrated Attach their top end with their free bottom end the pocket bottom 21 '; with possible fastening of the ledges 22 at its lower end is supported by a projection of the Engagement part 25 at the upper free end of the locking bars 22 on the pocket bottom 21 '. The locking bars 22 are stressed in this case. At least three bars are provided, which regularly over the The circumference of the outer housing 11 and the tool housing 7 is arranged distributed are.

Die untere Gruppe 16 der Riegelglieder wird von im unteren Endteil 17 des Außengehäuses 11 ausgebildeten, längsgerichteten Riegelnuten 26 in Form von rinnenförmig nach außen ausgeformten Taschen und von am verdickten Abschnitt 15 der Antriebswelle 9 des Tieflochmotors 8 mittels Schrauben 23 festgelegten Riegelleisten 27 gebildet, die ebenfalls aus einer versenkten Ausgangsstellung durch Wirkung einer Feder 28 in eine Riegelstellung elastisch auslenkbar sind, in der Eingriffsteile 29 der Riegelleisten 27 in die Riegelnuten 26 eingreifen. Die untere Gruppe 16 umfaßt zumindest drei Paarungen von Riegelnuten 26 und Riegelleisten 27, die gleichwinklig über den Umfang von Außengehäuse 11 bzw. Antriebswelle 9 verteilt angeordnet sind. Anstelle der dargestellten Anbringung der Riegelleisten 27 mit obenliegender Befestigungsstelle und unterem freien Ende können diese auch mit oberem freien Ende und unten befindlicher Befestigungsstelle angebracht sein.The lower group 16 of the locking members is in the lower end part 17 of the Outer housing 11 formed, longitudinal locking grooves 26 in shape from pockets shaped to the outside and from thickened Section 15 of the drive shaft 9 of the deep hole motor 8 by means of screws 23 fixed locking bars 27 formed, which also from a lowered starting position elastic by the action of a spring 28 in a locking position are deflectable, in the engaging parts 29 of the locking bars 27 into the locking grooves 26 intervene. The lower group 16 comprises at least three pairs of Locking grooves 26 and locking strips 27, which are equiangular over the circumference of Outer housing 11 and drive shaft 9 are arranged distributed. Instead of shown attachment of the locking bars 27 with an overhead fastening point and the lower free end can also be used with the upper free end Be attached at the end and bottom of the attachment point.

Um sicherzustellen, daß die Riegelleisten 27 der unteren Gruppe 16 nicht in die Riegelnut 21 der oberen Gruppe 14 einfallen können, ist die Riegelnut 21 der oberen Gruppe 14 mit einer Eingriffslänge ausgeführt, die kürzer ist als die Eingriffslänge der Eingriffsteile 29 der Riegelleisten 27 der unteren Gruppe 16. Dadurch ist sichergestellt, daß die Eingriffsteile 29 der Riegelleisten 27 der unteren Gruppe 16 nur in die für sie bestimmten Riegelnuten 26 der unteren Gruppe 16 einfallen können.To ensure that the locking bars 27 of the lower group 16 are not in the locking groove 21 of the upper group 14 can be the locking groove 21 the upper group 14 executed with an engagement length that is shorter than that Engagement length of the engagement parts 29 of the locking bars 27 of the lower group 16. This ensures that the engaging parts 29 of the locking bars 27 of the lower group 16 only in the locking grooves 26 intended for them the lower Group 16 can come up with.

Die Riegelnuten 26 der unteren Gruppe 16 weisen eine Eingriffslänge auf, die größer ist als die der Eingriffsteile 29 der Riegelleisten 27 der unteren Gruppe 16. Dies stellt sicher, daß sich das untere Endteil 17 des Außengehäuses 11 in axialer Richtung relativ zur Antriebswelle 9 zwischen zwei Endstellungen verlagern kann, wie sie in den Fig. 2 und 3 veranschaulicht sind. Dabei bildet die in Fig. 3 dargestellte obere Endstellung die Bohrbetriebsstellung, in der die Schneidebene der Bohrkrone 20 gegenüber der des Bohrmeißels 10 aufwärts versetzt ist und den Bohrmeißel 10 im Bereich seiner Seitenschneidfläche umgibt. Dies schafft einen besseren Abfluß von Bohrspülung und Bohrklein.The locking grooves 26 of the lower group 16 have an engagement length that is greater than that of the engaging parts 29 of the locking bars 27 of the lower group 16. This ensures that the lower end portion 17 of the outer housing 11 in shift in the axial direction relative to the drive shaft 9 between two end positions can, as illustrated in Figs. 2 and 3. The forms in Fig. 3 upper end position, the drilling operating position in which the Cutting plane of the drill bit 20 upwards from that of the drill bit 10 is offset and the drill bit 10 in the area of its side cutting surface surrounds. This creates a better drainage of drilling fluid and cuttings.

Zur Lagerung des unteren Endteils 17 am Hauptteil 13 des Außengehäuses 11 ist eine Lagerhülse 30 vorgesehen, die von oben in den unteren Endteil 17 des Außengehäuses 11 eingesetzt und mit diesem fest verbunden, z.B. verschraubt ist. Der untere Endabschnitt 18 des oberen Hauptteils 13 des Außengehäuses 11 umgreift die Lagerhülse 30 und bildet mit einer Lagerfläche 31 an seiner Innenseite ein zur Längsmittelachse 19 des Bohrgeräts koaxiales Gleitlager. Zugleich ist die Lagerhülse 30 im unteren Endabschnitt 18 des oberen Hauptteils 13 des Außengehäuses 11 axial verschieblich abgestützt, um so dem unteren Endteil 17 die oben schon erwähnte axiale Beweglichkeit zwischen der Ausgangsstellung nach Fig. 2 und der Bohrbetriebsstellung nach Fig. 3 zu ermöglichen.For mounting the lower end part 17 on the main part 13 of the outer housing 11 a bearing sleeve 30 is provided which from above into the lower end part 17 of the Inserted outer housing 11 and firmly connected to it, e.g. screwed is. The lower end portion 18 of the upper body 13 of the outer case 11 engages around the bearing sleeve 30 and forms with a bearing surface 31 on its inside a plain bearing coaxial with the longitudinal central axis 19 of the drilling device. At the same time, the bearing sleeve 30 is in the lower end section 18 of the upper Main part 13 of the outer housing 11 is axially displaceably supported, so the lower end part 17, the above-mentioned axial mobility between 2 and the drilling operating position 3 to enable.

An ihrem oberen Ende weist die Lagerhülse 30 außenseitig einen Bund 32 auf, der als Anschlag in Zusammenwirken mit einer Schulter 33 oberhalb der Lagerfläche 31 die untere Endstellung für den unteren Endteil 17 des Außengehäuses 11 definiert. Die Bohrbetriebsstellung wird hingegen durch das untere Ende der Riegelleisten 27 definiert, die mit einer Gegenfläche 34 als Anschlag zusammenwirken, die bei dem dargestellten Beispiel von der Stirnfläche des eingeschraubten unteren Abschnitts 35 des unteren Endteils 17 des Außengehäuses 11 gebildet wird, der in den darüberliegenden oberen Abschnitt 36 des unteren Endteils 17 des Außengehäuses 11 eingeschraubt ist.At its upper end, the bearing sleeve 30 has a collar 32 on the outside, the as a stop in cooperation with a shoulder 33 above the bearing surface 31 the lower end position for the lower end part 17 of the outer housing 11 defined. The drilling operating position, however, is the lower End of the locking ledges 27 defined with a counter surface 34 as a stop interact, which in the example shown from the end face of the screwed lower portion 35 of the lower end portion 17 of the outer housing 11 is formed, which in the overlying upper portion 36 of the lower end portion 17 of the outer housing 11 is screwed.

Während das Bohrgerät nach Fig. 1 bis 4 zum Abteufen von geraden Bohrlöchern 2 ausgebildet ist, ermöglicht die Ausgestaltung des Bohrgerätes nach Fig 5 die Ausführung von Richtungsbohrungen in unterirdische Formationen. Dies wird dadurch ermöglicht, daß bei sonst unveränderter Ausführung des Außengehäuses 11 der untere Endabschnitt 18 des oberen Hauptteils 13 des Außengehäuses 11 unter einem spitzen Winkel 37 von beispielsweise 1-3 ° zu dem darüber befindlichen Hauptteil 13 ausgerichtet ist. Dies kann beispielsweise durch eine winklige Ausrichtung des Gewindes 38 am unteren Ende des Hauptteils 13 des Außengehäuses 11 verwirklicht sein, auf das der untere Endabschnitt 18 aufgeschraubt wird. Statt dessen kann auch ein gesondertes Winkelstück als zwischenschraubbares Übergangsteil vorgesehen sein. 1 to 4 for sinking straight boreholes 2 is formed, allows the design of the drill according to 5 shows the execution of directional drilling in underground formations. This is made possible by the fact that the execution of the Outer housing 11 of the lower end portion 18 of the upper main part 13 of the Outer housing 11 at an acute angle 37 of, for example, 1-3 ° the overlying main part 13 is aligned. For example by an angular alignment of the thread 38 at the lower end of the Main part 13 of the outer housing 11 can be realized on which the lower end portion 18 is screwed on. Instead, a separate one Angle piece can be provided as an intermediate screwable transition part.

Um sicherzustellen, daß das Bohrwerkzeug 4 seine untere Endstellung im Außengehäuse 11 einnehmen kann, ist bei sonst unveränderter Ausbildung des Bohrwerkzeugs 4 die Antriebswelle 9 des Tieflochmotors 8 mit einem Abschnitt 39 erhöhter Flexibilität in Gestalt einer umlaufenden, den Biegewiderstand herabsetzenden Einziehung versehen, der dem sich abwärts anschließenden Teil der Antriebswelle 9 eine allseitige elastische Auslenkbarkeit verleiht. Der flexible Abschnitt 39 befindet sich, wenn sich das Bohrwerkzeug 4 in seiner unteren Endstellung im Außengehäuse 11 befindet, geringfügig unterhalb der Abwinklung 40, an der die Längsmittelachse 19 des Bohrgeräts in den abgewinkelten unteren Achsteil 19' übergeht.To ensure that the drilling tool 4 has its lower end position in the outer housing 11 can take, is otherwise unchanged training of Drilling tool 4, the drive shaft 9 of the deep hole motor 8 with one section 39 increased flexibility in the form of a circumferential, the bending resistance lowering confiscation, that of the downstream one Part of the drive shaft 9 gives an all-round elastic deflectability. The flexible section 39 is when the drilling tool 4 in its lower end position in the outer housing 11, slightly below the Bend 40, on which the longitudinal central axis 19 of the drill in the angled lower axis part 19 'merges.

Als Bohrmeißel 10 kann grundsätzlich jeder Meißeltyp Anwendung finden. Wesentlich ist jedoch, daß der Bohrmeißel 10 mit einem Stabilisatorteil 10' versehen ist, der der Innenseite des unteren Abschnitts 35 des unteren Endteils 17 in dichtem Abstand gegenüberliegt, und eine Seitenschneidfläche aufweist, die beispielsweise durch Überschleifen eine hohe Paßgenauigkeit aufweist und mit enger Passung die Bohrkrone 20 durchgreifen kann.In principle, any type of bit can be used as the drill bit 10. Essential is, however, that the drill bit 10 is provided with a stabilizer part 10 ' which is the inside of the lower portion 35 of the lower end part 17 is closely spaced, and has a side cutting surface that for example, by grinding, has a high accuracy of fit and with can fit through the drill bit 20.

Zum Abteufen einer Bohrung in unterirdische Formationen, deren Verlauf und Zusammensetzung in der Regel durch vorausgegangene geologische Untersuchungen bekannt ist, wird zunächst ein erster Teil eines Bohrlochs 2 mit Hilfe eines normalen Bohrwerkzeugs ähnlich dem Bohrwerkzeug 4 erbohrt, der sich durch irgendeine, z.B. von Schiefer gebildete, erste Formation hindurch bis in die Nähe des Grenzbereiches zu einer in Abteufrichtung nachfolgenden Sonderformation herabreicht, in der der Formationsdruck wesentlich höher oder niedriger ist, als er im Bereich der ersten Formation vorliegt. Diese erste Formation mit weitgehend gleichem ersten Formationsdruck kann eine im wesentlichen homogene Struktur haben, kann jedoch auch aus mehreren unterschiedlichen Teilformationen bestehen, zwischen denen keine erheblichen Formationsdruckunterschiede vorliegen.For drilling a borehole into underground formations, their course and Composition usually through previous geological surveys is known, a first part of a borehole 2 with Drilled using a normal drilling tool similar to drilling tool 4, the through any, e.g. first formation formed by slate up to the vicinity of the border area to a downstream area Special formation descends, in which the formation pressure is much higher or less than that in the area of the first formation. This first Formation with largely the same first formation pressure can be essentially one have a homogeneous structure, but can also consist of several different ones There are partial formations between which there are no significant ones Formation pressure differences exist.

Nach Abteufen dieses ersten Teils des Bohrlochs 2 wird das normale Bohrwerkzeug aufgezogen und in das Bohrloch 2 das Außengehäuse 11 eingefahren, das in der Länge so bemessen wird, daß es die vorermittelte Dicke der nachfolgenden Sonderformation überschreitet. Diese Sonderformation kann beispielsweise eine solche mit hohem Formationsdruck sein, wie das beispielsweise bei Deckschichten oberhalb von Gas- oder Öllagerschichten der Fall ist. Nach Einfahren des mit seinem oberen Ende zu diesem Zeitpunkt bohrturmseitig abgestützten Außengehäuses 11 in das Bohrloch 2 wird in das Außengehäuse 11 nunmehr das Bohrwerkzeug 4 unter fortschreitendem Aufbau des Rohrstrangs 3 eingefahren, bis das Bohrwerkzeug 4 eine untere, durch die obere Gruppe 14 der Riegelglieder 21,22 definierte Endstellung im Außengehäuse 11 erreicht hat und in dieser gegen weitere Abwärtsbewegung gesichert ist. In dieser unteren Endstellung, wie sie in Fig. 2 veranschaulicht ist, ist über die Riegelglieder 26,27 der unteren Gruppe 16 eine Verbindung zwischen der Antriebswelle 9,15 und dem unteren Endteil 17 des Außengehäuses 11 hergestellt, die bei Aufnahme des Bohrbetriebs sicherstellt, daß Antriebswelle 9 und unterer Endteil 17 des Außengehäuses 11 gemeinsam um die Längsmittelachse 19 des Bohrgeräts umlaufen und dadurch den Bohrmeißel 10 und die Bohrkrone 12 gemeinsam in Umdrehung versetzen.After this first part of borehole 2 has been sunk, it becomes the normal drilling tool mounted and the outer housing 11 inserted into the borehole 2, which is dimensioned in length so that it is the pre-determined thickness of the subsequent special formation exceeds. This special formation can for example, one with high formation pressure, such as that for cover layers above gas or oil storage layers Case is. After retracting the with its top end at that time Drill tower side supported outer housing 11 in the borehole 2 is in the Outer housing 11 now the drilling tool 4 with progressive construction of the pipe string 3 is retracted until the drilling tool 4 has a lower, end position defined by the upper group 14 of the locking members 21, 22 Has reached outer housing 11 and in this against further downward movement is secured. In this lower end position, as illustrated in Fig. 2 is a connection via the locking members 26,27 of the lower group 16 between the drive shaft 9,15 and the lower end part 17 of the outer housing 11 manufactured, which ensures that when drilling starts Drive shaft 9 and lower end part 17 of the outer housing 11 together run around the longitudinal central axis 19 of the drill and thereby the drill bit 10 and set the drill bit 12 together in rotation.

Sobald das Bohrwerkzeug 4 im Außengehäuse 11 abgesetzt und verriegelt ist,wird das obere Ende des Außengehäuses 11 mittels der Verbindungsvorrichtung 12, die irgendeine geeignete, bekannte Ausbildung aufweisen kann, mit dem Rohrstrang 3 verbunden und danach aus der bohrturmseitigen Abstützung gelöst. Die so gebildete Einheit der Teile 3,4 und 11 wird nun unter weiterem Aufbau des Rohrstrangs 3 in den ersten Teil des Bohrlochs 2 weiter eingefahren, bis Bohrmeißel 10 und Bohrkrone 11 die Sohle des Bohrlochs 2 erreichen. Anschließend wird nun das Bohrwerkzeug 4 in Betrieb genommen, was durch Einschalten bzw. Anfahren des Tieflochmotors 8 geschieht, der beispielsweise bei Ausbildung als Turbine oder Moineau-Motor durch Beaufschlagen mit Bohrspülung in Betrieb genommen wird. Diese wird durch den zentralen Spülungskanal 41 im Bohrstrang von übertage her zugeführt und tritt nach Durchströmen des zentralen Spülungskanals 41 stirnseitig aus dem Bohrmeißel 10 in das Bohrloch 2 aus, um nachfolgend im Ringraum zwischen Bohrgerät und Bohrlochwandung nach übertage zurückzuströmen.As soon as the drilling tool 4 is set down and locked in the outer housing 11 is, the upper end of the outer housing 11 by means of the connecting device 12, which may be of any suitable, known design, connected to tubing string 3 and then out of the rig support solved. The unit of parts 3, 4 and 11 thus formed is now under further construction of the pipe string 3 in the first part of the borehole 2 further retracted until drill bit 10 and drill bit 11 reach the bottom of borehole 2 to reach. The drilling tool 4 is then put into operation, what happens by switching on or starting the deep hole motor 8, for example by training as a turbine or Moineau motor is put into operation with drilling fluid. This is done by the central Flushing channel 41 in the drill string supplied from above and occurs Flow through the central flushing channel 41 from the face of the drill bit 10 in the borehole 2 to subsequently in the annulus between the drill and to flow back into the borehole wall above ground.

Beim nachfolgenden Abteufen eines weiteren, zumindest die Sonderformation durchquerenden Teils des Bohrlochs 2 wird vom Rohrstrang 3 das rohrförmige Außengehäuse 11 mitgeführt, wobei durch das Umlaufen der Bohrkrone 20 am unteren Ende des Außengehäuses 11 dieses seinerseits wie ein Bohrwerkzeug wirkt. Das Außengehäuse 11 kleidet im Bereich seiner Länge das Bohrloch 2 aus, nimmt einwärtsgerichtete Formationskräfte auf, sobald diese beispielsweise bei Druckabfall in der Bohrspülung wirksam werden, und bewirkt eine Abdichtung, die gegebenenfalls durch Einzementierung noch vervollkommnet werden kann.In the subsequent sinking of another, at least the special formation traversing part of the borehole 2, the tubular string 3 becomes tubular Carried outer housing 11, wherein by rotating the drill bit 20 on lower end of the outer housing 11 this in turn like a drilling tool works. The outer housing 11 lines the borehole in the region of its length 2 off, absorbs inward formation forces as soon as these, for example become effective when the pressure drops in the drilling fluid, and causes a waterproofing that may be perfected by cementing can be.

Hat die Bohrung nach Durchqueren der Sonderformation ihr Ziel, beispielsweise eine Gas- oder Öllagerstätte, erreicht, kann das Bohrwerkzeug nach Lösen der Verbindungsvorrichtung 12 aufgezogen und die Bohrung beispielsweise nach vollständiger Auskleidung als Produktionsbohrung verwendet werden. Ist dem Bohrloch ein weit über die Sonderformation herabreichender Verlauf zu geben, kann nach Aufziehen des zuvor mit dem Außengehäuse 11 verbundenen Bohrwerkzeugs4 ein zweites Bohrwerkzeug mitsamt Rohrstrang in das Bohrloch eingefahren werden, die durch das abgesetzte Außengehäuse hindurchführbar sind und das weitere Abteufen der Bohrung übernehmen können. Dabei kann, sofern bei weiterem Abteufen in erheblichem Abstand zur ersten Sonderformation eine weitere Sonderformation zu durchbohren ist, ein zweites Bohrgerät mit einem zweiten Außengehäuse zum Einsatz gebracht werden, das durch das abgesetzte erste Außengehäuse hindurchführbar ist. Der Ablauf des Bohrvorganges mit dem zweiten Bohrgerät gestaltet sich dann analog dem vorbeschriebenen Ablauf.If the hole has its target after crossing the special formation, for example reached a gas or oil deposit, the drilling tool can be loosened the connecting device 12 and the bore, for example can be used as a production well after being fully lined. Is the borehole extends far beyond the special formation can give after pulling the previously connected to the outer housing 11 Bohrwerkzeugs4 a second drilling tool with a pipe string into it Borehole are retracted, which can be passed through the offset outer housing are and can take over the further drilling of the hole. If there is further sinking at a considerable distance from the first Special formation Another special formation to be pierced, a second one Drilling rig with a second outer housing are used, that can be passed through the stepped first outer housing. The sequence the drilling process with the second drill is then analogous to that the above-described process.

In Fällen, in denen mehrere Sonderformationen in Abteufrichtung in verhältnismäßig dichtem Abstand aufeinanderfolgen, kann es zweckmäßig sein, das Außengehäuse durch sämtliche Sonderformationen hindurch mitzuführen und dementsprechend die Bohrlochauskleidung über sämtliche Sonderformationen zu erstrecken.In cases where several special formations in the direction of the sinking in proportion closely spaced, it may be appropriate that Carrying the outer housing through all special formations and accordingly the borehole lining over all special formations to extend.

Beim Abteufen von geraden Bohrungen unter Mitführung des Außengehäuses 11 wird der obere Hauptteil 13 des Außengehäuses 11 vorteilhaft durch den Rohrstrang 3 zum Zwecke der Reibungsminderung bzw. zur Geradführung des Bohrwerkzeugs 4 in Drehung versetzt. Sofern das Außengehäuse 11 mit einer Abwinklung in seinem unteren Bereich versehen und das Bohrgerät somit zu Richtbohrvorgängen einsetzbar ist, wird nach Bestimmung des Richtungsverlaufes des abgewinkelten Teils des Außengehäuses 11 dieses durch den Rohrstrang 3 von übertage her gegen Verdrehen gesichert, wodurch bei weiterem Bohrfortschritt ein in seine Richtung entsprechend geänderter Bohrlochteil erbohrt wird.When sinking straight holes while carrying the outer housing 11, the upper main part 13 of the outer housing 11 is advantageously by the Pipe string 3 for the purpose of reducing friction or to guide the straight line Drilling tool 4 set in rotation. If the outer housing 11 with a Angled in its lower area and the drill thus closed Directional drilling operations can be used after determining the direction course of the angled part of the outer housing 11 this through the Pipe string 3 is secured against twisting from above ground, which means that in the event of further Drilling progress a part of the borehole that has been changed in its direction is drilled.

Claims (19)

  1. A method of sinking a bore in underground formations with at least one special stratiform formation which features vastly differing formation pressures in respect of a formation adjacent to it in the sinking direction and in which a drilling tool carried at the bottom end of a drill line and having a drill bit driven by a deep drilling motor drills out a first part of a bore hole which extends to a point close to the boundary area of the at least one special formation, characterised in that upon subsequent sinking of a further part of the bore hole by the casing string which passes through at least one special formation, a tubular outer casing with a bottom end carrying a driven drill head is entrained, the bore hole being lined by this, at least in the region of the special formation.
  2. A method according to claim 1, characterised in that
    after the first part of the bore hole has been drilled out, the casing string is drawn up together with the drilling tool,
    the tubular outer casing carrying the drill head at the bottom end is inserted into the bore hole to a length which exceeds the previously ascertained thickness of the at least one special formation
    a drilling tool together with a tubular rod is introduced into the outer casing and the drilling tool is lowered in the outer casing in an extreme low position is fixed in which the drill head and drill bit are approximately at the same height,
    the top end of the outer casing is connected to the casing string,
    the casing string together with the outer casing is introduced farther into the bore hole until it reaches the bottom of the bore hole, and
    after the bottom of the bore hole has been reached, the drill bit and with it a bottom end part of the outer casing which carries the drill head are employed in a common drilling operation.
  3. A method according to claim 1 or 2, characterised in that during sinking of the bore in formations with only one special formation and a predetermined bore hole pattern extending down far beyond the special formation, sinking of the bore hole is completed once the special formation has been traversed, the connection of the outer casing to the casing string is separated, the casing string together with the drilling tool is pulled up and further sinking of the bore hole is undertaken with a second drilling tool which can be passed through the outer casing together with the casing string.
  4. A method according to claim 1 or 2, characterised in that where special formations are, adjacent one another or relatively closely adjacent special formations in the sinking direction, the further part of the bore hole is sunk through all the special formations by jointly conveying the outer casing.
  5. A method according to claim 1 or 2, characterised in that
    when there are a plurality of special formations which are relatively remote from one another in the sinking direction, the sinking of the further part of the bore hole is terminated after traversing the first special formation, the connection of the outer casing to the casing string is broken, the drill line is drawn up together with the drilling tool and the further part of the bore hole is made with a second drilling tool which can be passed through the outer casing together with the casing string to a point close to the boundary in respect of a second special formation,
    after sinking of the further part of the bore hole, the drilling tool is pulled up together with the casing string,
    a second outer casing which is provided with a drill head and which can be passed through the first outer casing is introduced into the bore hole to a length which is attuned to the thickness of the special formation which must subsequently be drilled,
    the second drilling tool is placed in the second outer casing and the second outer casing is connected to the second casing line, and
    the composite appliance is introduced until the bottom of the bore hole is reached and then a third part of the bore hole is drilled out and traverses at least the second special formation.
  6. A method according to one of claims 1 to 5, characterised in that the outer casing(s) is/are cemented in its/their intended position in the bore hole.
  7. A method according to one of claims 1 to 6, characterised in that the respective outer casing and the drilling tool placed in this latter form a directional drilling tool and are used for directional drillings.
  8. A method according to one of claims 1 to 7, characterised in that the upper main part of the outer casing is, for reducing friction and/or for straight drilling during sinking of the bore hole, caused to rotate by the casing line.
  9. A drilling plant for sinking a bore in underground formations with at least one stratiform special formation which has a formation pressure diverging considerably from a formation which is adjacent to it in the direction of sinking, with a casing string (3) and a drilling tool (4) which comprises a tubular tool housing (7) adapted to be connected to an upper end of a bottom end (5) of a casing string (3), a deep drilling motor (8) and a drill bit (10) which is mounted on, projecting beyond the bottom end of the tool housing (7), an end of a drive shaft (9) of the deep drilling motor (8), characterised in that it comprises an outer casing (11) of a length exceeding at least the thickness of the special formation and which has at the bottom end a drill head (20) and at the top end a connecting device (12) which can be engaged and disengaged, for fixing the outer casing (11) on the casing string (3) and in that drilling tool (4) and outer casing (11) are provided with locking members (21, 22; 26, 27) of which an upper group (14) braces the tool casing (7) in an extreme low position in the outer casing (11) and of which a bottom group (16) connects the driving shaft (9) of the deep drilling motor (8) and an independently rotatably mounted end part (17) of the outer casing (11) for a common rotary movement.
  10. A drilling tool according to claim 9, characterised in that the interlocking members (21, 22) of the upper group (14) preset on the drilling tool (4) an extreme low position in the outer casing (11) with a drill bit (10) situated at the level of the drill head (20) of the outer casing (11).
  11. A drilling tool according to claim 9 or 10, characterised in that the upper group (14) of the locking members (21, 22; 26, 27) comprises a locking groove (21) constructed in the outer casing (11) in the form of an outwardly shaped annular pocket and a locking strip (22) pivotally mounted on the tool housing (7) and which can be swung by spring action out of a concealed starting position into a locking position in which the locking strips (22) engage the locking grooves (21) and are in axial bracing engagement with the bottom (25) of the pocket.
  12. A drilling tool according to one of claims 9 to 11, characterised in that the bottom group (16) of locking members (21, 22; 26, 27) comprises, constructed in the bottom end part (17) of the outer housing (11), longitudinally directed locking grooves (26) in the form of pockets which are outwardly shaped like channels and locking strips (27) pivotally mounted on the drive shaft (9) of the deep bore motor (8) and which are adapted to be folded from a recessed starting position by spring action into a locking position in which the locking strips (27) engage the locking grooves (26).
  13. A drilling tool according to one of claims 11 or 12, characterised in that the locking groove (21) of the upper group (14) of the bracing and locking members (21, 22; 26, 27) comprises an engagement length which is shorter than that of the engagement parts (29) of the locking strips (27) of the lower group (16).
  14. A drilling tool according to one of claims 11 to 13, characterised in that the locking grooves of the lower group (16) of locking members (21, 22; 26, 27) have an engagement length which is greater than that of the engagement parts (29) of the locking strips (27) of the lower group (16).
  15. A drilling tool according to one of claims 9 to 14, characterised in that the bottom end part (17) of the outer housing (11) which is rotatably mounted on the upper main part (13) of the outer housing (11) is adapted for axial displacement out of a low starting position into a drilling position in which the cutting plane of the drill head (20) is offset upwardly in respect of the drill bit (10) and engages around the drill bit (10) in the region of its lateral cutting surface.
  16. A drilling tool according to one of claims 9 to 15, characterised in that the bottom end part (17) and the bottom end (18) of the upper main part (13) of the outer housing (11) engage around a bearing sleeve (30) which is rigidly connected to the bottom end part (17) and is braced for limited axial displacement in the bottom end (18) of the upper main part (13) of the outer housing (11).
  17. a drilling tool according to one of claims 9 to 16, characterised in that the bottom end (18) of the upper main part (13) of the outer housing (11) has an angled-over orientation while the drive shaft (9) of the deep drilling motor is provided with a flexible portion (39) which imparts a resilient universal deflectability to the downwardly adjacent part of the drive shaft (9).
  18. A drilling tool according to claim 17, characterised in that the flexible portion (39) of the drive shaft (9) is situated close to the angled part.
  19. A drilling tool according to one of claims 9 to 18, characterised in that a length equalising and pressure device (6) is disposed above the drilling tool (4).
EP95115867A 1995-10-09 1995-10-09 Method and boring tool for drilling into subterranean formations Expired - Lifetime EP0768446B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59508569T DE59508569D1 (en) 1995-10-09 1995-10-09 Method and drill for drilling holes in underground formations
EP95115867A EP0768446B1 (en) 1995-10-09 1995-10-09 Method and boring tool for drilling into subterranean formations
NO19964272A NO311046B1 (en) 1995-10-09 1996-10-08 Method and drilling apparatus for deepening boreholes in underground formations
US08/729,226 US5845722A (en) 1995-10-09 1996-10-09 Method and apparatus for drilling boreholes in earth formations (drills in liner systems)
US09/205,969 US6196336B1 (en) 1995-10-09 1998-12-04 Method and apparatus for drilling boreholes in earth formations (drilling liner systems)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95115867A EP0768446B1 (en) 1995-10-09 1995-10-09 Method and boring tool for drilling into subterranean formations

Publications (2)

Publication Number Publication Date
EP0768446A1 EP0768446A1 (en) 1997-04-16
EP0768446B1 true EP0768446B1 (en) 2000-07-12

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EP95115867A Expired - Lifetime EP0768446B1 (en) 1995-10-09 1995-10-09 Method and boring tool for drilling into subterranean formations

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US (1) US5845722A (en)
EP (1) EP0768446B1 (en)
DE (1) DE59508569D1 (en)
NO (1) NO311046B1 (en)

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Publication number Publication date
NO964272L (en) 1997-04-10
NO311046B1 (en) 2001-10-01
EP0768446A1 (en) 1997-04-16
NO964272D0 (en) 1996-10-08
DE59508569D1 (en) 2000-08-17
US5845722A (en) 1998-12-08

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