EP0397872B1 - Well expander - Google Patents

Well expander Download PDF

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Publication number
EP0397872B1
EP0397872B1 EP89902351A EP89902351A EP0397872B1 EP 0397872 B1 EP0397872 B1 EP 0397872B1 EP 89902351 A EP89902351 A EP 89902351A EP 89902351 A EP89902351 A EP 89902351A EP 0397872 B1 EP0397872 B1 EP 0397872B1
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EP
European Patent Office
Prior art keywords
piston
housing
borehole
annular
roller
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
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EP89902351A
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German (de)
French (fr)
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EP0397872A4 (en
EP0397872A1 (en
Inventor
Gabdrashit Sultanovich Abdrakhmanov
Albert Gabidullovich Zainullin
Konstantin Viktorovich Meling
Rauf Nukhovich Rakhmanov
Alexandr Petrovich Balandin
Alexandr Alexeevich Puzanov
Ilyas Anisovich Urazgildin
Almaz Adgamovich Mukhametshin
Almas Khazeevich Khakimov
Antanas Alexandrovich Yasas
Ljutsia Minigalimovna Naryshkina
Albert Musagitovich Akhunov
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TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI
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TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI
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Publication of EP0397872A1 publication Critical patent/EP0397872A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
    • E21B10/345—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type cutter shifted by fluid pressure

Definitions

  • the invention relates to drilling technology, in particular a reaming device for expanding the borehole.
  • the present invention can be used to isolate the areas of borehole complication resulting from an intensive loss of mud and cement slurry, fluid or gas flow from the digested layer to the borehole, and a fallout.
  • the borehole section which lies in the region of the borehole complications of the exposed layer, is expanded, and a shut-off device is installed in the enlarged region of the borehole in the form of, for example, profiled tubes, which are produced on the walls of the enlarged borehole region pressure in them during subsequent calibration of their inner through-channel to the specified borehole diameter.
  • a reaming tool for expanding the borehole is known (SU-A-874 952), which contains a housing with a connecting piece, a piston unit, extendable supports with rock-destroying elements and a limiter for extending the supports.
  • a reaming device for expanding the borehole (US-A-2630.300), which has a transition piece for its connection to a drive, a hollow housing with a central channel and radial bores in the side wall, extendable roller chisels with shafts arranged in the radial bores and a device for extending the roller chisels out of the radial bores of the housing, which device contains an annular piston and a locking device with an annular projection, which are arranged in the housing with the possibility of a limited axial displacement.
  • the aim of the invention is to improve the operational safety of the post-cleaner.
  • Another object of the present invention is to increase the quality of the well expansion work performed.
  • the invention has for its object to provide a Nachippor for borehole expansion, the design of which allows the roller chisel to be fully extended from the housing into the working position with simultaneous self-centering thereof with respect to the borehole walls.
  • a reaming device for expanding the borehole which has a transition piece for its connection to a drive, a hollow housing with a central channel and radial bores in its side wall, extendable roller chisels with shafts arranged in the radial bores of the housing and a device for extending the roller chisel from the radial bores, which includes an annular piston and a locking device for the roller chisel, comprises, according to the invention, the piston is rotatable together with the housing and rigidly connected to the transition piece, and radial channels are produced in the piston wall, which connect the central channel of the piston with a bring annular, formed by the piston and the housing walls in connection, wherein the locking device for the roller chisel is arranged to form a gap in the center channel of the piston and the housing and has an annular projection and wherein a seat is arranged in the central channel of the piston such that it can cooperate with the annular projection of the locking device, and on the annul
  • the reaming device according to the invention for widening the borehole makes it possible, thanks to the connection of the piston with the drive, to bring the arrester out of the working position under facilitated conditions and to allow the roller chisel to assume the transport position.
  • the roller chisel is self-centered with respect to the borehole walls, which causes the post-reamer to run unevenly during operation and consequently uneven wear of the roller chisel is avoided.
  • one-sided rock destruction is countered, ie the quality of the work for the borehole expansion is improved.
  • This effect is exacerbated by the fact that, thanks to a decrease in the pressure difference between the center channel of the reamer and the deepest hole, the degree of extension of the roller chisel into the working position can be judged. This avoids the situation in which the roller chisels which are incompletely driven by eyes are not worked and therefore no proper borehole expansion is carried out.
  • the clearer for expanding the borehole contains a hollow cylindrical housing 1 with a central channel 2 and radial bores 3 in its side wall, in which shafts 4 with radially displaceable roller chisels 6 fastened to them by means of the axes are arranged, which are designed as truncated ball segments .
  • the shafts 4 are secured against rotation in the bores 3 by means of a wedge 7.
  • a drill bit 8 and a union nut 9 are connected with projections 10, the are arranged below the roller chisel 6 and serve for centering the reaming tool in the borehole and protect the roller chisel 6 against damage during installation and removal work.
  • the union nut 9 is secured against unscrewing by means of a screw 11.
  • the upper part of the housing 1 is designed as a union nut 12, which is connected to the main part thereof by means of a thread 13, slotted longitudinal grooves 14 being provided on the inner wall of the main part of the housing 1.
  • a device for extending the roller chisel 6, which has an annular piston 15 arranged in the union nut 12 with a center channel 16 and a lock 17 for the shafts 4.
  • a transition piece 18 with a central channel 19 in its upper part, which is rigidly connected to the annular piston 15.
  • the center channel 19 of the transition piece 18 is connected to the center channel 16 of the annular piston 15 and by means of radial bores 20 to an annular space 21 located above the piston.
  • the lower part of the annular piston 15 has outer slots 22 which cooperate with the slotted grooves 14 of the housing 1.
  • the lower part of the arrester 17 has a conical surface 23, the arrester 17 being accommodated in the central channel 16 of the piston 15 while leaving a gap and having an annular projection 24 with longitudinal channels 25, which cooperates with a seat 26 arranged in the central channel 16 of the piston 15.
  • the arrester 17 has a further annular projection 27 which interacts with an annular seat 28 of the housing 1.
  • the transition piece 18 is provided with a stop nut 31 for its more reliable connection to the drive.
  • the reaming tool for expanding the borehole works as follows.
  • the reaming device is connected to a drive, e.g. a bottom hole drive (a turbo, electric drill), which is attached to the drill string (not shown), and drives it in up to the predetermined, to be expanded borehole interval (FIG. 3).
  • a drive e.g. a bottom hole drive (a turbo, electric drill)
  • the rod train (not shown) is rotated with simultaneous flushing supply to it, the flushing via the central channel 19 of the transition piece 18 and the central channel 16 of the piston 15 and further via the longitudinal channels 25 of the annular projection 24 of the arrester 17 and via the Channels 2, 29 of the housing 1 into the flushing openings (not shown) of the drill bit 8.
  • the roller chisels 6 do not protrude beyond the housing 1, and the annular projection 24 of the lock 17 is supported against the seat 26 of the piston 15. Due to the pressure difference, which acts on the upper end face of the piston 15 via the radial channels 20, the union nut 12 goes up together with the remaining part of the housing 1. Here, the torque is transmitted from the transition piece 18 and the piston 15 to the housing 1 by means of the slots 22 of the piston 15, which come into engagement with the slotted grooves 14 of the housing 1. When the housing 1 rises, the shafts 4, by interacting with the locking device 17, begin to extend out of the radial bores 3 of the housing 1, and the roller chisels 6 drill the borehole wall.
  • the borehole is widened to the desired diameter in the calculated interval.
  • the rock-destroying elements (not designated) of the roller chisel 6 penetrate and destroy the rock, while the calibration elements (not designated) of the roller chisel 6 smooth the unevenness of the borehole wall.
  • the housing 1 Under the effect of its weight, the housing 1 lowers and the arrester 17 is released from the shafts 4, the roller chisels 6 moving together with the shafts 4 through the action of the reaction forces of the non-expanded borehole section into the interior of the housing 1 in this way the reamer is brought into the transport position to expand the borehole.

Abstract

A well expander comprises an adapter (18) for its connection to a drive, a hollow casing (1) with a central channel (2) and with radial openings (3) in its lateral wall, sliding cutters (6) provided with clamping blocks (4) and secured in the radial openings (3) of the casing (1), and a mechanism for sliding out the cutters (6), consisting of a piston (15) and a holder (17) of the cutters (6). The piston (15) is connected to the casing (1) in a manner providing for the possibility of their common rotation and is rigidly connected with the adapter (16). The wall of the piston (15) is provided with radial channels (20) connecting its central channel (16) with an annular cavity (21) formed by the walls of the piston (15) and of the casing (1). The holders (17) of the cutters (6) is mounted with a gap in the central channels (16, 2) of the piston (15) and of the casing (1) and has an annular protrusion (24). In the central channel (16) of the piston (15) is mounted a saddle (26) capable of co-operating with the annular protrusion (24) of the holder (17).

Description

Die Erfindung betrifft die Bohrtechnik, insbesondere einen Nachräumer zur Bohrlocherweiterung.The invention relates to drilling technology, in particular a reaming device for expanding the borehole.

Am effektivsten kann die vorliegende Erfindung für die Absperrung der Bereiche der Bohrlochkomplikation angewendet werden, die infolge eines intensiven Spühlungs- und Zementschlämmenverlustes, eines Flüssigkeits- bzw. Gaszuflusses aus der aufgeschlossenen Schicht zum Bohrloch sowie eines Nachfalls entstehen.Most effectively, the present invention can be used to isolate the areas of borehole complication resulting from an intensive loss of mud and cement slurry, fluid or gas flow from the digested layer to the borehole, and a fallout.

Beim Niederbringen von tiefen Erdöl- und Gasbohrungen trifft man oftmals Schichten an, die in Bezug auf die Bohrbedingungen miteinander unvereinbar sind, d.h. Schichten mit anomal hohen bzw. geringen Schichtdrücken, sowie Schichten mit Nachfällen an.When drilling deep oil and gas wells, one often encounters layers that are incompatible with one another in terms of drilling conditions, i.e. Layers with abnormally high or low layer pressures, as well as layers with falls.

Um das weitere Bohren ohne Abnahme eines vorbestimmten Bohrlochdurchmessers sicherzustellen, erweitert man den Bohrlochabschnitt, der im Bereich der Bohrlochkomplikationen der aufgeschlossenen Schicht liegt, und montiert eine Absperreinrichtung im erweiterten Bereich des Bohrloches in Form beispielsweise von Profilrohren, die an die Wandungen des erweiterten Bohrlochbereiches durch Erzeugen in ihnen eines Druckes bei nachfolgendem Kalibrieren ihres inneren Durchgangskanals auf den vorgegebenen Bohrlochdurchmesser angedrückt werden.In order to ensure further drilling without taking away a predetermined borehole diameter, the borehole section, which lies in the region of the borehole complications of the exposed layer, is expanded, and a shut-off device is installed in the enlarged region of the borehole in the form of, for example, profiled tubes, which are produced on the walls of the enlarged borehole region pressure in them during subsequent calibration of their inner through-channel to the specified borehole diameter.

Es ist ein Nachräumer zur Bohrlocherweiterung bekannt (SU-A-874 952), der ein Gehäuse mit einem Stutzen, eine Kolbeneinheit, ausfahrbare Stützen mit gesteinszerstörenden Elementen und einen Begrenzer für das Ausfahren der Stützen enthält.A reaming tool for expanding the borehole is known (SU-A-874 952), which contains a housing with a connecting piece, a piston unit, extendable supports with rock-destroying elements and a limiter for extending the supports.

Bekannt ist ferner ein Nachräumer zur Bohrlocherweiterung (US-A-2630.300), der ein Übergangsstück für seine Verbindung mit einem Antrieb, ein hohles Gehäuse mit einem Mittenkanal und Radialbohrungen in der Seitenwand, in den Radialbohrungen angeordnete ausfahrbare Rollenmeißel mit Schäften und eine Vorrichtung zum Ausfahren der Rollenmeißel aus den Radialbohrungen des Gehäuses umfaßt, welche Vorrichtung einen Ringkolben und einen Feststeller mit einem ringförmigen Vorsprung enthält, die im Gehäuse mit Möglichkeit einer begrenzten Axialverschiebung angeordnet sind.Also known is a reaming device for expanding the borehole (US-A-2630.300), which has a transition piece for its connection to a drive, a hollow housing with a central channel and radial bores in the side wall, extendable roller chisels with shafts arranged in the radial bores and a device for extending the roller chisels out of the radial bores of the housing, which device contains an annular piston and a locking device with an annular projection, which are arranged in the housing with the possibility of a limited axial displacement.

Der grundsätzliche Nachteil der bekannten Nachräumer besteht darin, daß die gesteinszerstörenden Elemente (Rollenmeißel) in bezug auf die Bohrlochwandungen nicht selbstzentrierbar sind, wodurch sich die Oberfläche der Bohrlochwandung im erweiterten Bereich als uneben bezüglich der Bohrlochachse ergibt. Als Folge hiervon tritt eine niedrige Qualität der Schichtabsperrung sowie eine Erschwerung des Bohrvorganges infolge eines ungleichmäßigen Durchmessers des Durchgangskanals in der Absperreinrichtung auf, wodurch ein normaler Einbau des Bohrwerkzeuges behindert wird.The basic disadvantage of the known post-clearer is that the rock-destroying elements (roller chisels) cannot be self-centered with respect to the borehole walls, which results in the surface of the borehole wall in the enlarged region being uneven with respect to the borehole axis. As a result, there is a low quality of the layer shut-off as well as an aggravation of the drilling process due to an uneven diameter of the through-channel in the shut-off device, which hinders normal installation of the drilling tool.

Ein weiterer Nachteil der bekannten Nachräumer ist, daß sich keine Möglichkeit für die Überwachung deren Verhältensweise im Bohrloch seitens des Bedienungspersonals bietet, da kein Signal für das Ausfahren der Rollenmeißel in die Arbeitsstellung geliefert wird. Im Ergebnis davon wird ein Bohrloch mit ungenügender Qualität erweitert.Another disadvantage of the known Nachräumer is that there is no possibility for the operator to monitor their behavior in the borehole, since no signal for the extension of the roller chisel is delivered into the working position. As a result, a hole of insufficient quality is being expanded.

Es ist das Ziel der Erfindung, die Betriebssicherheit des Nachräumers zu verbessern.The aim of the invention is to improve the operational safety of the post-cleaner.

Ein weiteres Ziel der vorliegenden Erfindung ist eine Erhöhung der Qualität der durchgeführten Arbeiten bei der Bohrlocherweiterung.Another object of the present invention is to increase the quality of the well expansion work performed.

Der Erfindung liegt die Aufgabe zugrunde, einen Nachräumer zur Bohrlocherweiterung zu schaffen, dessen konstruktive Auslegung das vollständige Ausfahren der Rollenmeißel aus dem Gehäuse in die Arbeitsstellung bei gleichzeitiger Selbstzentrierung derselben bezüglich der Bohrlochwandungen ermöglicht.The invention has for its object to provide a Nachräumer for borehole expansion, the design of which allows the roller chisel to be fully extended from the housing into the working position with simultaneous self-centering thereof with respect to the borehole walls.

Diese Aufgabe wird dadurch gelöst, daß bei einem Nachräumer zur Bohrlocherweiterung, welcher ein Übergangsstück für seine Verbindung mit einem Antrieb, ein hohles Gehäuse mit einem Mittenkanal und Radialbohrungen in dessen Seitenwand, ausfahrbare Rollenmeißel mit in den Radialbohrungen des Gehäuses angeordneten Schäften und eine Vorrichtung zum Ausfahren der Rollenmeißel aus den Radialbohrungen, die einen Ringkolben und einen Feststeller für die Rollenmeißel einschließt, umfaßt, erfindungsgemäß der Kolben mit dem Gehäuse gemeinsam drehbar und mit dem Übergangsstück starr verbunden ist, und in der Kolbenwandung Radialkanäle hergestellt sind, die den Mittenkanal des Kolbens mit einem ringförmigen, durch die Kolben- und die Gehäusewandungen gebildeten Hohlraum in Verbindung bringen, wobei der Feststeller für die Rollenmeißel unter Bildung eines Spaltes im Mittenkanal des Kolbens und des Gehäuses angeordnet ist und einen ringförmigen Vorsprung aufweist und wobei im Mittenkanal des Kolbens ein Sitz angeordnet ist, derart, daß er mit dem ringförmigen Vorsprung des Feststellers zusammenwirken kann, und an dem ringförmigen Vorsprung des Feststellers und an der Innenfläche des Gehäuses, an der Stelle der Wechselwirkung des Feststellers mit den Rollenmeißeln, Kanäle für die Verbindung des Mittenkanals des Kolbens mit einem im Unterteil des Gehäuses befindlichen Hohlraum vorgesehen sind.This object is achieved in that in a reaming device for expanding the borehole, which has a transition piece for its connection to a drive, a hollow housing with a central channel and radial bores in its side wall, extendable roller chisels with shafts arranged in the radial bores of the housing and a device for extending the roller chisel from the radial bores, which includes an annular piston and a locking device for the roller chisel, comprises, according to the invention, the piston is rotatable together with the housing and rigidly connected to the transition piece, and radial channels are produced in the piston wall, which connect the central channel of the piston with a bring annular, formed by the piston and the housing walls in connection, wherein the locking device for the roller chisel is arranged to form a gap in the center channel of the piston and the housing and has an annular projection and wherein a seat is arranged in the central channel of the piston such that it can cooperate with the annular projection of the locking device, and on the annular projection of the locking device and on the inner surface of the housing, at the point of interaction of the locking device with the roller chisels, channels for the Connection of the center channel of the piston with a cavity located in the lower part of the housing are provided.

Der erfindungsgemäße Nachräumer zur Bohrlocherweiterung ermöglicht es, dank der Verbindung des Kolbens mit dem Antrieb unter erleichterten Bedingungen den Feststeller aus der Arbeitsstellung zu bringen und die Rollenmeißel die Transportstellung einnehmen zu lassen.The reaming device according to the invention for widening the borehole makes it possible, thanks to the connection of the piston with the drive, to bring the arrester out of the working position under facilitated conditions and to allow the roller chisel to assume the transport position.

Darüber hinaus wird dank der Anordnung des Feststellers für die Rollenmeißel unter Belassung eines Spaltes im Mittenkanal des Kolbens eine Selbstzentrierung der Rollenmeißel bezüglich der Bohrlochwandungen erzielt, wodurch eine Laufunruhe des Nachräumers während des Betriebs und folglich ein ungleichmäßiger Verschleiß der Rollenmeißel vermieden wird. Durch Ausschließen der Abweichungen der Rollenmeißel von der Bohrlochachse wird einer einseitigen Gesteinszerstörung begegnet, d.h. die Qualität der Arbeiten für die Bohrlocherweiterung wird verbessert. Dieser Effekt verstärkt sich noch dadurch, daß dank einer Abnahme der Druckdifferenz zwischen dem Mittenkanal des Nachräumers und dem Bohrlochtiefsten über den Grad des Ausfahrens der Rollenmeißel in die Arbeitsstellung geurteilt werden kann. Damit wird die Sachlage vermieden, bei welcher mit den unvollständig augenfahrenen Rollenmeißeln gerarbeitet und somit keine richtige Bohrlocherweiterung bewerkstelligt wird.In addition, thanks to the arrangement of the lock for the roller chisel, leaving a gap in the center channel of the piston, the roller chisel is self-centered with respect to the borehole walls, which causes the post-reamer to run unevenly during operation and consequently uneven wear of the roller chisel is avoided. By excluding the deviations of the roller chisel from the borehole axis, one-sided rock destruction is countered, ie the quality of the work for the borehole expansion is improved. This effect is exacerbated by the fact that, thanks to a decrease in the pressure difference between the center channel of the reamer and the deepest hole, the degree of extension of the roller chisel into the working position can be judged. This avoids the situation in which the roller chisels which are incompletely driven by eyes are not worked and therefore no proper borehole expansion is carried out.

Die anderen Ziele und Vorteile der Erfindung werden aus der nachfolgenden detaillierten Beschreibung eines Ausführungsbeispiels derselben und aus beigefügten Zeichnungen besser verstanden, in denen es zeigt:

  • Fig. 1 eine Gesamtansicht eines Nachräumers zur Bohrlocherweiterung in der Transportstellung mit einem Teilschnitt,
  • Fig. 2 einen Schnitt nach Linie II-II der Fig. 1 und
  • Fig. 3 eine Gesamtansicht des Nachräumers in der Arbeitsstellung mit einem teilweisen Längsschnitt.
The other objects and advantages of the invention will be better understood from the following detailed description of an embodiment thereof and from the accompanying drawings, in which it shows:
  • 1 is an overall view of a Nachräumers for drilling expansion in the transport position with a partial section,
  • Fig. 2 shows a section along line II-II of Fig. 1 and
  • Fig. 3 is an overall view of the Nachräumers in the working position with a partial longitudinal section.

Beste Ausführungsform der ErfindungBest embodiment of the invention

Der Nachräumer zur Bohrlocherweiterung (Fig. 1) enthält ein hohles zylindrisches Gehäuse 1 mit einem Mittenkanal 2 und Radialbohrungen 3 in dessen Seitenwand, in denen Schäfte 4 mit daran mittels der Achsen befestigten ausfahrbaren Rollenmeißeln 6 radial verschiebbar angeordnet sind, die als abgestumpfte Kugelsegmente ausgebildet sind. Gegen Drehung sind die Schäfte 4 in den Bohrungen 3 mittels eines Keiles 7 gesichert. Mit dem Unterteil des Gehäuses 1 sind ein Bohrmeißel 8 und eine Überwurfmutter 9 mit Vorsprüngen 10 verbunden, die unterhalb der Rollenmeißel 6 angeordnet sind und für die Zentrierung des Nachräumers im Bohrloch dienen und die Rollenmeißel 6 bei Ein- und Ausbauarbeiten gegen Beschädigungen schützen. Die Überwurfmutter 9 ist gegen Abschrauben mittels einer Schraube 11 gesichert.The clearer for expanding the borehole (FIG. 1) contains a hollow cylindrical housing 1 with a central channel 2 and radial bores 3 in its side wall, in which shafts 4 with radially displaceable roller chisels 6 fastened to them by means of the axes are arranged, which are designed as truncated ball segments . The shafts 4 are secured against rotation in the bores 3 by means of a wedge 7. With the lower part of the housing 1, a drill bit 8 and a union nut 9 are connected with projections 10, the are arranged below the roller chisel 6 and serve for centering the reaming tool in the borehole and protect the roller chisel 6 against damage during installation and removal work. The union nut 9 is secured against unscrewing by means of a screw 11.

Der Oberteil des Gehäuses 1 ist als Überwurfmutter 12 ausgebildet, die mit dessen Hauptteil mittels eines Gewindes 13 verbunden ist, wobei an der Innenwand des Hauptteiles des Gehäuses 1 geschlitzte Längsnuten 14 vorgesehen sind.The upper part of the housing 1 is designed as a union nut 12, which is connected to the main part thereof by means of a thread 13, slotted longitudinal grooves 14 being provided on the inner wall of the main part of the housing 1.

In dem Mittenkanal 2 des Gehäuses 1 befindet sich eine (nicht bezeichnete) Vorrichtung zum Ausfahren der Rollenmeißel 6, die einen in der Überwurfmutter 12 angeordneten Ringkolben 15 mit einem Mittenkanal 16 und einen Feststeller 17 für die Schäfte 4 aufweist.In the center channel 2 of the housing 1 there is a device (not designated) for extending the roller chisel 6, which has an annular piston 15 arranged in the union nut 12 with a center channel 16 and a lock 17 for the shafts 4.

Für den Anschluß des Nachräumers an einen Antrieb (nicht gezeigt) ist in dessen Oberteil ein Übergangsstück 18 mit einem Mittenkanal 19 vorhanden, das mit dem Ringkolben 15 starr verbunden ist. Der Mittenkanal 19 des Übergangsstückes 18 steht mit dem Mittenkanal 16 des Ringkolbens 15 und mittels Radialbohrungen 20 mit einem über Kolben liegenden Ringraum 21 in Verbindung. Der Unterteil des Ringkolbens 15 weist äußere Schlitze 22 auf, die mit den geschlitzten Nuten 14 des Gehäuses 1 zusammenwirken. Der Unterteil des Feststellers 17 besitzt eine Kegelfläche 23, wobei der Feststeller 17 unter Belassung eines Spaltes im Mittelkanal 16 des Kolbens 15 untergebracht ist und einen ringförmigen Vorsprung 24 mit Längskanälen 25 besitzt, der mit einem im Mittenkanal 16 des Kolbens 15 angeordneten Sitz 26 zusammenwirkt. Daneben weist der Feststeller 17 einen weiteren ringförmigen Vorsprung 27 auf, der mit einem ringförmigen Sitz 28 des Gehäuses 1 in Wechselwirkung steht. An der Innenfläche des Gehäuses 1, nämlich an der Stelle des Zusammenwirkens der Rollenmeißel 6 mit dem Feststeller 17, sind Längskanäle 29 (Fig. 2) für die Verbindung des Mittelkanals 16 (Fig. 1) des Kolbens 15 mit einem in Unterteil des Gehäuses 1 befindlichen Hohlraum 30 hergestellt.For the connection of the post-reamer to a drive (not shown) there is a transition piece 18 with a central channel 19 in its upper part, which is rigidly connected to the annular piston 15. The center channel 19 of the transition piece 18 is connected to the center channel 16 of the annular piston 15 and by means of radial bores 20 to an annular space 21 located above the piston. The lower part of the annular piston 15 has outer slots 22 which cooperate with the slotted grooves 14 of the housing 1. The lower part of the arrester 17 has a conical surface 23, the arrester 17 being accommodated in the central channel 16 of the piston 15 while leaving a gap and having an annular projection 24 with longitudinal channels 25, which cooperates with a seat 26 arranged in the central channel 16 of the piston 15. In addition, the arrester 17 has a further annular projection 27 which interacts with an annular seat 28 of the housing 1. On the inner surface of the housing 1, namely at the point where the roller chisel 6 interacts with the locking device 17, there are longitudinal channels 29 (FIG. 2) for the connection of the central channel 16 (FIG. 1) of the piston 15 with a cavity 30 located in the lower part of the housing 1.

Das Übergangsstück 18 ist für dessen zuverlässigere Verbindung mit dem Antrieb mit einer Anschlagmutter 31 versehen.The transition piece 18 is provided with a stop nut 31 for its more reliable connection to the drive.

Der Nachräumer zur Bohrlocherweiterung arbeitet wie folgt.The reaming tool for expanding the borehole works as follows.

Den Nachräumer verbindet man unter Zuhilfenahme des Übergangsstückes 18 mit einem Antrieb, z.B. einem Bohrlochsohlenantrieb (einem Turbo-, Elektrobohrer), der am Gestängestrang (nicht gezeigt) angebracht ist, und fährt ihn bis zum vorbestimmten, zu erweiternden Bohrlochintervall (Fig. 3) ein. Dann versetzt man den Gestängestrang (nicht gezeigt)unter gleichzeitiger Spülungszuführung zu ihm in Drehung, wobei die Spülung über den Mittenkanal 19 des Übergangsstückes 18 und den Mittenkanal 16 des Kolbens 15 und weiter über die Längskanäle 25 des ringförmigen Vorsprunges 24 des Feststellers 17 und über die Kanäle 2, 29 des Gehäuses 1 in die Spülöffnungen (nicht gezeigt) des Bohrmeißels 8 gelangt.With the aid of the transition piece 18, the reaming device is connected to a drive, e.g. a bottom hole drive (a turbo, electric drill), which is attached to the drill string (not shown), and drives it in up to the predetermined, to be expanded borehole interval (FIG. 3). Then the rod train (not shown) is rotated with simultaneous flushing supply to it, the flushing via the central channel 19 of the transition piece 18 and the central channel 16 of the piston 15 and further via the longitudinal channels 25 of the annular projection 24 of the arrester 17 and via the Channels 2, 29 of the housing 1 into the flushing openings (not shown) of the drill bit 8.

Im anfänglichen Augenblick ragen die Rollenmeißel 6 nicht über des Gehäuse 1 hinaus, und der ringförmige Vorsprung 24 des Feststellers 17 stützt sich gegen den Sitz 26 des Kolbens 15 ab. Durch die Druckdifferenz, die auf die obere Stirnfläche des Kolbens 15 über die Radialkanäle 20 einwirkt, geht die Überwurfmutter 12 gemeinsam mit dem restlichen Teil des Gehäuses 1 hoch. Hierbei wird das Drehmoment von dem Übergangsstück 18 und dem Kolben 15 auf das Gehäuse 1 mittels der Schlitze 22 des Kolbens 15, die mit den geschlitzten Nuten 14 des Gehäuses 1 in Eingriff kommen, übertragen. Beim Hochgang des Gehäuses 1 beginnen die Schäfte 4, indem sie mit dem Feststeller 17 zusammenwirken, aus den Radialbohrungen 3 des Gehäuses 1 auszufahren, und die Rollenmeißel 6 bohren die Bohrlochwandung ab. Im Zuge der weiteren Erweiterung kommt der zylindrische Teil des Feststellers 17 zwischen den Schäften 4 zu liegen und fixiert diese und folglich die bezüglich des Gehäuses 1 ausgefahrenen Rollenmeißel 6 zuverlässig. Zu diesem Zeitpunkt läßt der Sitz 28 des Gehäuses 1 durch die Berührung mit dem ringförmigen Vorsprung 27 des Feststellers 17 den letzteren so weit hochgehen, daß sich der ringförmige Vorsprung 24 oberhalb des Sitzes 26 des Kolbens 15 erweist. Infolge der Bildung eines Spaltes zwischen der unteren Stirnfläche des ringförmigen Vorsprunges 24 des Feststellers 17 und dem Sitz 26 des Kolbens 15 nimmt der Förderdruck ab, was durch Druckmesser (nicht gezeigt) angezeigt wird. Ein Druckabfall zeugt davon, daß die Rollenmeißel 6 vollständig ausgefahren und in die Bohrlochwandung eingeschnitten sind, wodurch eine Erweiterung mit dem rechnerischen Durchmesser hergestellt wird. Indem der Nachräumer gesenkt wird, bewerkstelligt man eine Erweiterung des Bohrloches im errechneten Intervall bis auf den gewünschten Durchmesser. Unter der Wirkung einer Axialbelastung dringen die gesteinszerstörenden Elemente (nicht bezeichnet) der Rollenmeißel 6 ins Gebirge ein und zerstören dieses, während die Kalibrierelemente (nicht bezeichnet) der Rollenmeißel 6 die Unebenheiten der Bohrlochwandung glätten. Nach Beendigung der Erweiterung des Bohrloches wird das Einpumpen der Bohrspülung eingestellt und der Nachräumer nach übertage gehoben. Unter der Wirkung seines Gewichtes senkt sich das Gehäuse 1 ab, und der Feststeller 17 wird aus den Schäften 4 freigegeben, hierbei bewegen sich die Rollenmeißel 6 zusammen mit den Schäften 4 durch die wirkung der Reaktionskräfte des nicht erweiterten Bohrlochabschnittes ins Innere des Gehäuses 1. Auf diese Weise wird der Nachräumer zur Bohrlocherweiterung in die Transportstellung gebracht.At the beginning, the roller chisels 6 do not protrude beyond the housing 1, and the annular projection 24 of the lock 17 is supported against the seat 26 of the piston 15. Due to the pressure difference, which acts on the upper end face of the piston 15 via the radial channels 20, the union nut 12 goes up together with the remaining part of the housing 1. Here, the torque is transmitted from the transition piece 18 and the piston 15 to the housing 1 by means of the slots 22 of the piston 15, which come into engagement with the slotted grooves 14 of the housing 1. When the housing 1 rises, the shafts 4, by interacting with the locking device 17, begin to extend out of the radial bores 3 of the housing 1, and the roller chisels 6 drill the borehole wall. In the course of further expansion the cylindrical part of the arrester 17 comes to rest between the shafts 4 and fixes them and consequently the roller chisels 6 extended with respect to the housing 1 reliably. At this time, the seat 28 of the housing 1, by contact with the annular projection 27 of the arrester 17, allows the latter to go up so far that the annular projection 24 above the seat 26 of the piston 15 proves to be. As a result of the formation of a gap between the lower end face of the annular projection 24 of the lock 17 and the seat 26 of the piston 15, the delivery pressure decreases, which is indicated by pressure gauges (not shown). A drop in pressure shows that the roller chisels 6 are fully extended and cut into the borehole wall, thereby producing an expansion with the calculated diameter. By lowering the scraper, the borehole is widened to the desired diameter in the calculated interval. Under the action of an axial load, the rock-destroying elements (not designated) of the roller chisel 6 penetrate and destroy the rock, while the calibration elements (not designated) of the roller chisel 6 smooth the unevenness of the borehole wall. After the expansion of the borehole has been completed, the pumping in of the drilling fluid is stopped and the clearer is raised above ground. Under the effect of its weight, the housing 1 lowers and the arrester 17 is released from the shafts 4, the roller chisels 6 moving together with the shafts 4 through the action of the reaction forces of the non-expanded borehole section into the interior of the housing 1 in this way the reamer is brought into the transport position to expand the borehole.

Claims (1)

  1. A reamer for the well expansion, comprising a transition piece (18) for its connection to a drive, a hollow casing (1) with a central passageway (2) and radial bores (3) in its lateral wall, extendable roller bits (6) with shafts (4) disposed in the radial bores (3) of the housing (1), and a means for extending the roller bits (6) from the radial bores (3), including an annular piston (15) and a locking means (17) for the roller bits (6),
    characterized in that
    the piston (15) is jointly rotatable with the housing (1) and is rigidly connected to the transition piece (18), in that radial passageways (20) are provided in the piston wall, connecting the central passageway (16) of the piston (15) to an annular hollow space (21) defined by the walls of the piston (15) and of the housing (1), the locking means (17) for the roller bits (6) being disposed in the central passageways (16, 2) of respectively the piston (15) and the housing (1) whilst forming a gap and comprising an annular projection (24), and in the central passageway (16) of the piston (15) a seat (26) being arranged for cooperation with the annular projection (24) of the locking means (17), and on the annular projection (24) of the locking means (17) and on the inner surface of the housing (1) - at the point of interaction of the locking means (17) with the roller bits (6) - longidudinal passageways (29) for connection of the central passageway (16) of the piston (15) to a hollow space (30) located in the lower portion of the housing (1) being provided.
EP89902351A 1988-11-22 1989-06-08 Well expander Expired - Lifetime EP0397872B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/SU1988/000236 WO1990005829A1 (en) 1988-11-22 1988-11-22 Well expander
CA000610485A CA1335198C (en) 1988-11-22 1989-09-06 Well reamer
CN89107058A CN1016201B (en) 1988-11-22 1989-09-09 Well reamer

Publications (3)

Publication Number Publication Date
EP0397872A1 EP0397872A1 (en) 1990-11-22
EP0397872A4 EP0397872A4 (en) 1991-12-11
EP0397872B1 true EP0397872B1 (en) 1994-02-16

Family

ID=27168450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89902351A Expired - Lifetime EP0397872B1 (en) 1988-11-22 1989-06-08 Well expander

Country Status (9)

Country Link
US (1) US5184687A (en)
EP (1) EP0397872B1 (en)
JP (1) JPH03503792A (en)
CN (1) CN1016201B (en)
AU (1) AU621088B2 (en)
CA (1) CA1335198C (en)
DE (1) DE3887904D1 (en)
NO (1) NO176729C (en)
WO (1) WO1990005829A1 (en)

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CN1088157C (en) * 1995-08-22 2002-07-24 中国石油天然气总公司江汉机械研究所 incline shaft petroleum oil-well pump
GB2313860B (en) * 1996-06-06 2000-11-01 Paul Bernard Lee Adjustable roller reamer
US6059051A (en) * 1996-11-04 2000-05-09 Baker Hughes Incorporated Integrated directional under-reamer and stabilizer
US6598678B1 (en) * 1999-12-22 2003-07-29 Weatherford/Lamb, Inc. Apparatus and methods for separating and joining tubulars in a wellbore
BE1014047A3 (en) * 2001-03-12 2003-03-04 Halliburton Energy Serv Inc BOREHOLE WIDER.
US6929076B2 (en) * 2002-10-04 2005-08-16 Security Dbs Nv/Sa Bore hole underreamer having extendible cutting arms
US6886633B2 (en) * 2002-10-04 2005-05-03 Security Dbs Nv/Sa Bore hole underreamer
CN2685530Y (en) * 2004-03-09 2005-03-16 伍利钱 Drill bits for enlarging the borehole
US7658241B2 (en) * 2004-04-21 2010-02-09 Security Dbs Nv/Sa Underreaming and stabilizing tool and method for its use
CN1965145B (en) * 2004-06-09 2010-05-05 霍利贝顿能源服务股份有限公司 Enlarging and stabilising tool for a borehole
AU2010244940B2 (en) 2009-05-06 2016-06-09 Dynomax Drilling Tools Inc. Slide reamer and stabilizer tool
US20130168076A1 (en) * 2011-12-28 2013-07-04 Baker Hughes Incorporated Milling Tool
WO2014134736A1 (en) * 2013-03-07 2014-09-12 Dynomax Drilling Tools Inc. Downhole motor
CN103203876B (en) * 2013-04-02 2015-12-02 宁波富乐礼机器人科技有限公司 reamer
US11071363B2 (en) * 2018-08-28 2021-07-27 Elad Burko Thin card sized wallet
CN111411896B (en) * 2020-03-26 2021-06-25 成都理工大学 Drill bit for petroleum geological exploration

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Also Published As

Publication number Publication date
EP0397872A4 (en) 1991-12-11
CN1050075A (en) 1991-03-20
WO1990005829A1 (en) 1990-05-31
CN1016201B (en) 1992-04-08
CA1335198C (en) 1995-04-11
DE3887904D1 (en) 1994-03-24
US5184687A (en) 1993-02-09
NO176729C (en) 1995-05-16
AU3057589A (en) 1990-06-12
NO903239D0 (en) 1990-07-19
EP0397872A1 (en) 1990-11-22
AU621088B2 (en) 1992-03-05
JPH03503792A (en) 1991-08-22
NO176729B (en) 1995-02-06
NO903239L (en) 1990-07-19

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