EP0397870B1 - Method of casing the production seam in a well - Google Patents

Method of casing the production seam in a well Download PDF

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Publication number
EP0397870B1
EP0397870B1 EP89902215A EP89902215A EP0397870B1 EP 0397870 B1 EP0397870 B1 EP 0397870B1 EP 89902215 A EP89902215 A EP 89902215A EP 89902215 A EP89902215 A EP 89902215A EP 0397870 B1 EP0397870 B1 EP 0397870B1
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Prior art keywords
casing
bore
productive
production
tour
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EP89902215A
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German (de)
French (fr)
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EP0397870A1 (en
EP0397870A4 (en
Inventor
Vadim Vadimovich Artynov
Gabdrashit Sultanovich Abdrakhmanov
Rustam Khamitovich Ibatullin
Renat Khaliullovich Muslimov
Rashat Khasanovich Fatkullin
Rashid Akhmadullovich Khabibullin
Yaroslav Vasilievich Vakula
Vitaly Petrovich Filippov
Salikhzian Mukhametzyanovich Mingazov
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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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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/14Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/10Setting of casings, screens, liners or the like in wells
    • E21B43/103Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like

Definitions

  • the invention relates to a method for fastening productive layers of a deep bore of the type specified in the preamble of claim 1.
  • the liquid introduced into the borehole i.e. the drilling fluids and cement muds penetrate into the productive layer and deteriorate its storage or flow capacity, which extends the drilling time and requires additional measures to restore this storage capacity.
  • Such measures are associated with a high workload and the use of expensive technical units.
  • the invention is based on the object of a method for fastening or solidifying the productive layers of a deep borehole To show, which allows an increase in the inflow and filtration area while reducing the thickness of the insulating layer separating the productive layer from other layers.
  • the impermeable casing can expediently be installed in the area of the productive layer together with the production tube tour, which saves additional work for the installation of the profile tube tour on separate drill pipes.
  • the section of the bore lying in the area of the productive layer should preferably be expanded by a factor of 1.5 to 2.0 of the outside diameter of the production tube tour. If the diameter is increased by less than 1.5 times the diameter of the production tube tour, the inflow area for the liquid increases only insignificantly, while an expansion by more than twice the diameter of the production pipe tour is limited by the limit values of the maximum possible expansion of the profile pipes.
  • the method for fastening the productive layer in a deep borehole is implemented as follows.
  • the drill string is then removed together with the chisel and the scraper, and a production pipe tour is inserted into the drill hole, at the lower end of which a device for cementing and an impermeable casing made of profiled pipes are attached.
  • the running in of this tube tour is stopped as soon as the profile tube tour is in the extended area of the productive layer.
  • the impermeable profile tube tour is widened by injecting liquid into the interior of the profile tubes until the casing lies tight against the wall of the extended area of the productive layer, after which the production tube tour is cemented and the productive layer is opened up in a known manner by perforating the impermeable casing .
  • the method is carried out with the aid of a device which has a drill string 1 (FIG. 1) with a chisel 2 at the lower end and a post-clearer 3 arranged above it with extendable clearing elements 4.
  • Another group of equipment for carrying out the method (Fig. 2 and 3) contains a production pipe tour 5, at the lower end of which a device 6 for cementation is attached, which serves as a continuation.
  • the device 6 has a transition 7 with wall openings 8 and 9, in the interior of which a bushing 10 is accommodated with a side opening 11 and a seat 12, which is secured against axial displacement by a pin 13.
  • Profile tubes are connected to the lower end of the transition 7 to form an impermeable casing 14, which ends with a shoe 15 with a seat 16 and a ball valve 17.
  • a ball 18 (FIG. 3) is provided, which is accommodated in the seat 12 of the socket 10.
  • the productive layer 19 is drilled.
  • the area of the productive layer 19 is widened by the extended broaching elements 4 of the post-clearer 3, this widening extending by 10 to 20 m to above and below this area.
  • the production pipe tour 5 (FIG. 2) is retracted, specifically together with the impermeable casing 14 made of profiled steel pipes with longitudinal folds and the shoe 15 with the seat 16 and the ball valve 17.
  • the transition 7, which basically represents the continuation of the production tube tour 5, engages with its lower end in the upper part of the impermeable casing 14 to such an extent that there is a mutual connection.
  • the installation of the production pipe tour 5 is stopped. During the installation of this pipe tour, the liquid in the bore presses the ball valve 17 in the shoe 15 upwards and fills the cavity 21.
  • a liquid such as drilling fluid
  • a liquid such as drilling fluid
  • Pumped pressure from 12 to 14 MPa and the impermeable casing 14 consisting of profile tubes is stretched to its tight contact with the wall of the enlarged area 20, so that the productive layer 19 is reliably separated from other layers.
  • the pressure is released and the ball 18 (FIG. 3) is thrown into the production tube tour 5, which falls into the seat 12 of the bushing 10 arranged in the passage 7 of the transition 7.
  • the liquid pressure is increased again, under the influence of which the pins 13 are sheared off, and the bushing 10 moves into its lower end position (FIG. 3).
  • the liquid is displaced from the cavity 21 through the opening 9 into the annular space, so that the lateral openings 11 and 8 of the socket 10 and the transition 7 coincide with each other.
  • the production tube tour 5 is then cemented using the conventional method, for which purpose cementing units (not shown) are used.
  • the elements 10, 12 and 18 are drilled out inside the pipe tour 5.
  • the production layer is then processed using known methods such as opened again by perforation of the casing, and the product is removed from the layer 19 through the holes 22 (FIG. 4) of the perforation.

Abstract

A method of casing the production seam in a well provides for stripping the production seam (19) and enlarging the borehole in a zone (20) of the production seam (19). Then the production seam (19) is closed off by an envelope (14) impermeable to liquid media and consisting of profiled pipes expanded in the process of their installation by creating pressure therein. After that, the string (5) of exploitation pipes is lowered down the well and cemented, with subsequent re-opening of the seam (19). The lowering down of the exploitation pipe string (5) is terminated after its introduction into the upper part of the impermeable envelope (14).

Description

Die Erfindung betrifft ein Verfahren zur Befestigung von produktiven Schichten einer Tiefbohrung der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.The invention relates to a method for fastening productive layers of a deep bore of the type specified in the preamble of claim 1.

Im zuge des Niederbringens einer Tiefbohrung kann die in das Bohrloch eingebrachte Flüssigkeit, d.h. die Bohrspülungen und Zementschlämme, in die produktive Schicht eindringen und deren Speicher- bzw. Durchflußvermögen verschlechtern, was die Aufschlußzeit der Bohrung verlängert und zu sätzliche Maßnahmen zur Wiederherstellung dieses Speichervermögens erfordert. Derartige Maßnahmen sind mit einem hohen Arbeitsaufwand und dem Einsatz von kostspieligen technischen Aggregaten verbunden.In the course of drilling a deep well, the liquid introduced into the borehole, i.e. the drilling fluids and cement muds penetrate into the productive layer and deteriorate its storage or flow capacity, which extends the drilling time and requires additional measures to restore this storage capacity. Such measures are associated with a high workload and the use of expensive technical units.

In der Druckschrift Ju. V. Vadetsky "Herstellung von Erdöl- und Gasbohrungen", 1973, Verl. "Nedra", Moskau, S. 346-348, ist bereits ein Verfahren zur Verfestigung der produktiven Schicht in einer Tiefbohrung bekannt, bei welchem die produktive Schicht aufgeschlossen, einer Produktionsrohrtour eingebaut und diese oberhalb der produktiven Schicht zementiert wird. Der nichtzementierte unterste Abschnitt dieser Rohrtour wird im Bereich der produktiven Schicht perforiert, wodurch diese Schicht zum zweiten Mal aufgeschlossen wird. Ein wesentlicher Nachteil dieses Verfahrens ist, daß dabei keine zuverlässige Trennung der produktiven Schicht von den tiefer gelegenen Schichten erzielt wird, weil die Produktionsrohrtour nur oberhalb der produktiven Schicht zementiert und damit gegen das Gebirge abgedichtet wird. Ferner ist dieses Verfahren dann ungeeignet, wenn die produktiven Schichten zum Nachfallen neigen, da der Ringraum zwischen der Produktionsrohrtour und der produktiven Schicht mit dem nachfallenden Gestein ausgefüllt wird, was den Ausfluß des Produktes aus der Schicht behindert.In the publication Ju. V. Vadetsky "Production of oil and gas wells", 1973, publ. "Nedra", Moscow, pp. 346-348, a method for solidifying the productive layer in a deep well is already known, in which the productive layer is digested, one Production pipe tour installed and this is cemented above the productive layer. The non-cemented lowest section of this pipe tour is perforated in the area of the productive layer, whereby this layer is opened up for the second time. A major disadvantage of this method is that there is no reliable separation of the productive layer is achieved by the lower layers because the production pipe tour is only cemented above the productive layer and thus sealed against the mountains. Furthermore, this method is unsuitable if the productive layers tend to fall, since the annular space between the production tube tour and the productive layer is filled with the falling rock, which hinders the outflow of the product from the layer.

In dem Fachartikel "Isolation von Verlustzonen unter Verwendung von Stahlrohren ohne Verringerung des Bohrlochdurchmessers" von G.S. Abdakhmanov u.a., erschienen in NEFTYANOE KHOZYAISTVO, No. 4, Apr. 1982, S. 26-28 ist ein Verfahren zum Abdichten von bestimmten Bohrlochabschnitten gegen bohrtechnisch kritische Gebirgsschichten beschrieben, bei dem diese Bohrlochabschnitte mittels eines Nachräumers aufgeweitet und anschließend mit einer undurchlässiger, festen Hülle ausgekleidet werden. Zum Herstellen dieser Hülle wird eine Profilrohrtour in das Bohrloch eingefahren und im vo-cgesehenen Bohrlochabschnitt durch hydraulischen Innendruck und mechanische Werkzeuge bis zur dichten Anlage an der Bohrlochwandung aufgeweitet. Anschließend wird mit dem gleichbleibenden Meißeldurchmesser weitergebohrt.In the technical article "Isolation of loss zones using steel pipes without reducing the borehole diameter" by G.S. Abdakhmanov et al., Published in NEFTYANOE KHOZYAISTVO, No. 4, Apr. 1982, pp. 26-28 describes a method for sealing certain borehole sections against mountain layers that are critical in terms of drilling technology, in which these borehole sections are expanded by means of a reaming device and then lined with an impermeable, solid casing. To produce this casing, a profile tube tour is inserted into the borehole and expanded in the intended borehole section by hydraulic internal pressure and mechanical tools until it lies tightly against the borehole wall. Then the drilling continues with the same chisel diameter.

Aus der US-A-2 804 148 ist ein ähnliches Auskleidungs-Verfahren bekannt, bei dem zum Abdichten eines Bohrlochabschnittes gegen bohrtechnisch kritische Gebirgsschichten dieser Bohrlochabschnitt erweitert und durch ein schlauchartiges Inlet aus einem verformbaren Verbundwerkstoff ausgekleidet wird, woraufhin eine Aushärtung dieses Verbundwerkstoffes erfolgt. Anschließend wird auch bei diesem Verfahren weitergebohrt.A similar lining method is known from US Pat. No. 2,804,148, in which, in order to seal a borehole section against mountain layers critical in terms of drilling technology, this borehole section is expanded and lined with a hose-like inlet made of a deformable composite material, whereupon this composite material is cured. This method is then used to continue drilling.

Aus der US-A-2 644 523 ist es bekannt, in eine Tiefbohrung eine Futterrohrtour abzusenken, deren unteres Ende mit dem oberen Ende eines zuvor in die Bohrung eingebrachten Liners verbunden wird, dessen Innendurchmesser dem des Futterrohrs entspricht. Anschließend wird der Ringraum zwischen dem Liner inkl. des Verbindungsabschnittes und der Bohrlochwandung zementiert.From US-A-2 644 523 it is known to lower a casing tour into a deep borehole, the lower end of which is connected to the upper end of a liner previously inserted into the borehole, the inside diameter of which corresponds to that of the casing. The annular space between the liner including the connecting section and the borehole wall is then cemented.

Schließlich ist aus der SU-A-911 015 ein gattungsgemäßes Verfahren zur Verfestigung der produktiven Schichten in einer Tiefbohrung bekannt, bei dem die betreffende Gebirgsschicht durch undurchlässige formsteife Profilrohre abgedeckt wird, die nach der Positionierung im jeweiligen Bohrlochabschnitt durch einen Innendruck aufgeweitet werden. In diese aufgeweitete Profilrohrtour wird eine Produktionsrohrtour eingebaut und darin zementiert, woraufhin der er neute Aufschluß der Schicht durch Perforation dieser Hülle und der sie umgebenden Zementschicht erfolgt. Nachteilig bei diesem bekannten Verfahren ist die relativ große Dicke der aus den Wänden der Profilrohrtour, der Produktionsrohrtour und aus der zwischenliegenden Zementschicht gebildeten Isolierschicht, wodurch der erneute Schichtaufschluß erschwert und der Produktionsfluß aus der Gebirgsschicht in die Bohrung beeinträchtigt wird. Die Verwendung der im Durchmesser relativ kleinen Produktionsrohrtour führt zu einer verringerten Einström- bzw. Filtrationsfläche, was eine entsprechend verringerte Förderrate zur Folge hat. Ferner erfordert dieses Verfahren zusätzliche Ein- und Ausbauarbeiten für das Positionieren und Aufweiten der Profilrohrtour, was mit einem beträchtlichen Zeit- und Materialaufwand verbunden ist.Finally, from SU-A-911 015 a generic method for solidifying the productive layers in a deep borehole is known, in which the mountain layer in question is covered by impervious, dimensionally stable profile tubes which are expanded by an internal pressure after positioning in the respective borehole section. In this widened profile tube tour, a production tube tour is installed and cemented therein, whereupon he re-disintegrates the layer by perforating this shell and the cement layer surrounding it. A disadvantage of this known method is the relatively large thickness of the insulating layer formed from the walls of the profile tube tour, the production tube tour and the intermediate cement layer, which makes it difficult to re-open the layers and the production flow from the rock layer into the bore is impaired. The use of the relatively small diameter production tube tour leads to a reduced inflow or filtration area, which results in a correspondingly reduced delivery rate. Furthermore, this method requires additional installation and removal work for the positioning and expansion of the profile tube tour, which is associated with a considerable expenditure of time and material.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Be- bzw. Verfestigung der produktiven Schichten einer Tiefbohrung aufzuzeigen, welches eine Vergrößerung der Einström- und Filtrationsfläche unter gleichzeitiger Verringerung der Dicke der die produktive Schicht von anderen Schichten trennenden Isolierschicht ermöglicht.The invention is based on the object of a method for fastening or solidifying the productive layers of a deep borehole To show, which allows an increase in the inflow and filtration area while reducing the thickness of the insulating layer separating the productive layer from other layers.

Diese Aufgabe wird durch die im Patentanspruch 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in claim 1.

Durch die Durchmesservergrößerung der Bohrung im Bereich der produktiven Schicht und durch die Einführung der Produktionsrohrtour nur in den Oberteil der undurchlässigen Hülle, wird die Ausbildung eines Zementrings im Bereich der produktiven Schicht vermieden, was eine Verringerung der Dicke der Isolierschicht bedeutet, wobei gieichzeitig die Einström- und Filtrationsfläche des Produktionsrohres und damit die Förderrate erhöht werden.By increasing the diameter of the bore in the area of the productive layer and by introducing the production tube tour only into the upper part of the impermeable casing, the formation of a cement ring in the area of the productive layer is avoided, which means a reduction in the thickness of the insulating layer, with the inflow and filtration area of the production pipe and thus the delivery rate can be increased.

Wenn die Erweiterung der Bohrung im Bereich der produktiven Schicht gleichzeitig mit deren Aufschluß erfolgt, können zusätzliche Arbeiten für den Ein- und Ausbau der Aufweitvorrichtung in das Bohrloch eingespart werden.If the bore in the area of the productive layer is expanded at the same time as it is disrupted, additional work for installing and removing the expansion device into the borehole can be saved.

Zweckmäßig kann die undurchlässige Hülle im Bereich der produktiven Schicht gemeinsam mit der Produktionsrohrtour eingebaut werden, wodurch zusätzliche Arbeiten für den Einbau der Profilrohrtour an gesonderten Gestängerohren eingespart werden.The impermeable casing can expediently be installed in the area of the productive layer together with the production tube tour, which saves additional work for the installation of the profile tube tour on separate drill pipes.

Vorzugsweise sollte der im Bereich der produktiven Schicht liegende Abschnitt der Bohrung um den Faktor 1,5 bis 2,0 des Außendurchmessers der Produktionsrohrtour erweitert werden. Bei einer Durchmesservergrößerung um weniger als das 1,5fache des Durchmessers der Produktionsrohrtour vergrößert sich die Einströmfläche für die Flüssigkeit nur unwesentlich, während eine Erweiterung um mehr als das 2fache des Durchmessers der Produktionsrohrtour durch die Grenzwerte der maximal möglichen Dehnung der Profilrohre begrenzt wird.The section of the bore lying in the area of the productive layer should preferably be expanded by a factor of 1.5 to 2.0 of the outside diameter of the production tube tour. If the diameter is increased by less than 1.5 times the diameter of the production tube tour, the inflow area for the liquid increases only insignificantly, while an expansion by more than twice the diameter of the production pipe tour is limited by the limit values of the maximum possible expansion of the profile pipes.

Weitere Besonderheiten und Vorteile der Erfindung werden aus der nachfolgenden Beschreibung eines Ausführungsbeispiels und aus der Zeichnung besser verständlich. Es zeigen:

Fig. 1
einen Erweiterungsvorgang des im Bereich der produktiven Schicht liegenden Abschnitts der Bohrung;
Fig. 2
das Einsetzen einer undurchlässigen Hülle im erweiterten Abschnitt der Bohrung;
Fig. 3
einen Zementationsvorgang der Produktionsrohrtour;
Fig. 4
einen Abschnitt der Produktionsrohrtour mit der undurchlässigen Hülle, der für die Förderung vorbereitet ist.
Further special features and advantages of the invention can be better understood from the following description of an exemplary embodiment and from the drawing. Show it:
Fig. 1
an expansion process of the section of the bore lying in the region of the productive layer;
Fig. 2
inserting an impervious sheath in the enlarged portion of the bore;
Fig. 3
a cementation process of the production pipe tour;
Fig. 4
a section of the production tube tour with the impermeable casing that is prepared for production.

Das Verfahren zur Befestigung der produktiven Schicht in einer Tiefbohrung wird wie folgt realisiert.The method for fastening the productive layer in a deep borehole is implemented as follows.

Bevor die produktive Schicht aufgeschlossen wird, wird über dem Meißel ein Nachräumer angeordnet, und der Schichtaufschluß erfolgt gleichzeitig mit einer Bohrloch-Erweiterung im Bereich der produktiven Schicht um den Faktor 1,5 bis 2 des Außendurchmessers der Produktionsrohrtour.Before the productive layer is digested, a clearer is placed over the chisel, and the layer disintegration takes place simultaneously with a borehole widening in the area of the productive layer by a factor of 1.5 to 2 of the outside diameter of the production pipe tour.

Danach wird der Bohrstrang gemeinsam mit dem Meißel und dem Nachräumer ausgebaut, und in die Bohrung wird eine Produktionsrohrtour eingefahren, an deren unterem Ende eine Vorrichtung zur Zementation und eine undurchlässige Hülle aus Profilrohren befestigt sind. Das Einfahren dieser Rohrtour wird gestoppt, sobald sich die Profilrohrtour in dem erweiterten Bereich der produktiven Schicht befindet. Im Anschluß daran wird die undurchlässige Profilrohrtour durch Einpressen von Flüssigkeit ins Innere der Profilrohre bis zum dichten Anliegen der Hülle an der Wandung des erweiterten Bereiches der produktiven Schicht aufgeweitet, wonach die Produktionsrohrtour zementiert und die produktive Schicht durch Perforation der undurchlässigen Hülle in bekannter Weise aufgeschlossen wird.The drill string is then removed together with the chisel and the scraper, and a production pipe tour is inserted into the drill hole, at the lower end of which a device for cementing and an impermeable casing made of profiled pipes are attached. The running in of this tube tour is stopped as soon as the profile tube tour is in the extended area of the productive layer. Subsequently, the impermeable profile tube tour is widened by injecting liquid into the interior of the profile tubes until the casing lies tight against the wall of the extended area of the productive layer, after which the production tube tour is cemented and the productive layer is opened up in a known manner by perforating the impermeable casing .

Das Verfahren wird mit Hilfe einer Vorrichtung durchgeführt, die einen Bohrstrang 1 (Fig. 1) mit einem Meißel 2 am unteren Ende und einem darüber angeordneten Nachräumer 3 mit ausfahrbaren Räumelementen 4 aufweist. Eine weitere Gruppe der Ausrüstung für die Durchführung des Verfahrens (Fig. 2 und 3) enthält eine Produktionsrohrtour 5, an deren unterem Ende eine Vorrichtung 6 für die Zementation befestigt ist, die als ihre Fortsetzung dient. Die Vorrichtung 6 weist einen Übergang 7 mit Wandöffnungen 8 und 9 auf, in dessen Innerem eine Buchse 10 mit einer Seitenöffnung 11 und einem Sitz 12 untergebracht ist, die gegen axiale Verschiebungen durch einen Stift 13 gesichert ist. Mit dem unteren Ende des Übergangs 7 sind Profilrohre zur Bildung einer undurchlässigen Hülle 14 verbunden, die mit einem Schuh 15 mit einem Sitz 16 und einem Kugelventil 17 endet. Für die Zementation der Produktionsrohrtour ist eine Kugel 18 (Fig. 3) vorgesehen, die im Sitz 12 der Buchse 10 untergebracht ist.The method is carried out with the aid of a device which has a drill string 1 (FIG. 1) with a chisel 2 at the lower end and a post-clearer 3 arranged above it with extendable clearing elements 4. Another group of equipment for carrying out the method (Fig. 2 and 3) contains a production pipe tour 5, at the lower end of which a device 6 for cementation is attached, which serves as a continuation. The device 6 has a transition 7 with wall openings 8 and 9, in the interior of which a bushing 10 is accommodated with a side opening 11 and a seat 12, which is secured against axial displacement by a pin 13. Profile tubes are connected to the lower end of the transition 7 to form an impermeable casing 14, which ends with a shoe 15 with a seat 16 and a ball valve 17. For the cementation of the production pipe tour, a ball 18 (FIG. 3) is provided, which is accommodated in the seat 12 of the socket 10.

Die nachstehend angeführten Beispiele dienen zum besseren Verständnis des erfindungsgemäßen Verfahrens zur Befestigung der produktiven Shicht innerhalbb einer Bohrung.The examples below serve to better understand the method according to the invention for fastening the productive layer within a bore.

Beim Niederbringen der Bohrung unter Verwendung des am Bohrgestänge 1 befestigten Meißels 2 (Fig. 1) wird die produktive Schicht 19 angebohrt. Gleichzeitig wird durch die ausgefahrenen Räumelemente 4 des Nachräumers 3 der Bereich der produktiven Schicht 19 erweitert, wobei sich diese Erweiterung um 10 bis 20 m bis oberhalb und unterhalb dieses Bereiches erstreckt.When drilling the hole using the chisel 2 (FIG. 1) attached to the drill pipe 1, the productive layer 19 is drilled. At the same time, the area of the productive layer 19 is widened by the extended broaching elements 4 of the post-clearer 3, this widening extending by 10 to 20 m to above and below this area.

Nach dem Ausbau des Bohrgestänges 1 aus der Bohrung wird die Produktionsrohrtour 5 (Fig. 2) eingefahren, und zwar zusammen mit der am unteren Ende mittels des Übergangs 7 befestigten undurchlässigen Hülle 14 aus profilierten Stahlrohren mit Längsfalten und dem Schuh 15 mit dem Sitz 16 und dem Kugelventil 17. Wie aus Fig. 2 erkennbar, greift der Übergang 7, der im Grunde die Fortsetzung der Produktionsrohrtour 5 darstellt, mit seinem unteren Ende in den Oberteil der undurchlässigen Hülle 14 so weit ein, daß eine gegenseitige Verbindung besteht. Nach Erreichen des erweiterten Bereiches 20 der produktiven Schicht 19 durch die undurchlässige Hülle 14 wird der Einbau der Produktionsrohrtour 5 gestoppt. Während des Einbaus dieser Rohrtour drückt die in der Bohrung befindliche Flüssigkeit das Kugelventil 17 im Schuh 15 nach oben und füllt den Hohlraum 21. Danach wird in den Hohlraum 21 (Fig. 2) über die Produktionsrohrtour 5 eine Flüssigkeit, wie z.B. Bohrspülung, unter einem Druck von 12 bis 14 MPa gepumpt und die aus Profilrohren bestehende undurchlässige Hülle 14 wird bis zu ihrem dichten Anliegen an der Wandung des erweiterten Bereiches 20 gedehnt, so daß die produktive Schicht 19 von anderen Schichten zuverlässig getrennt wird. Hierbei befindet sich das Kugelventil 17 des Schuhs 15 im Sitz 16, d.h. es ist geschlossen.After removing the drill pipe 1 from the bore, the production pipe tour 5 (FIG. 2) is retracted, specifically together with the impermeable casing 14 made of profiled steel pipes with longitudinal folds and the shoe 15 with the seat 16 and the ball valve 17. As can be seen from FIG. 2, the transition 7, which basically represents the continuation of the production tube tour 5, engages with its lower end in the upper part of the impermeable casing 14 to such an extent that there is a mutual connection. After reaching the enlarged area 20 of the productive layer 19 through the impermeable casing 14, the installation of the production pipe tour 5 is stopped. During the installation of this pipe tour, the liquid in the bore presses the ball valve 17 in the shoe 15 upwards and fills the cavity 21. Then a liquid, such as drilling fluid, is placed in the cavity 21 (FIG. 2) via the production pipe tour 5 Pumped pressure from 12 to 14 MPa and the impermeable casing 14 consisting of profile tubes is stretched to its tight contact with the wall of the enlarged area 20, so that the productive layer 19 is reliably separated from other layers. Here is the ball valve 17 of the shoe 15 in the seat 16, ie it is closed.

Eine zusätzliche Abdichtung des hinter der undurchlässigen Hülle 14 liegenden Raums kann mit Hilfe einer Dichtungspaste (nicht gezeigt) erreicht werden, die in die Vertiefungen der Profilrohre der undurchlässigen Hülle 14 eingebracht ist.Additional sealing of the space behind the impermeable casing 14 can be achieved with the aid of a sealing paste (not shown) which is introduced into the recesses of the profile tubes of the impermeable casing 14.

Nach dem vollen Ausrichten der undurchlässigen Hülle 14 läßt man den Druck abfallen und wirft in die Produktionsrohrtour 5 die Kugel 18 (Fig. 3) hinein, die in den Sitz 12 der im Durchgangskanal des Übergangs 7 angeordneten Büchse 10 fällt. In der Profilrohrtour 5 wird der Flüssigkeitsdruck wieder erhöht, unter dessen Einfluß die Stifte 13 abgeschert werden, und die Buchse 10 sich in ihre untere Endstellung (Fig. 3) bewegt. Hierbei wird die Flüssigkeit aus dem Hohlraum 21 über die Öffnung 9 in den Ringraum verdrängt, so daß die seitlichen Öffnungen 11 und 8 der Buchse 10 und des Übergangs 7 miteinander zusammenfallen. Anschließend wird die Produktionsrohrtour 5 nach dem herkömmlichen Verfahren zementiert, wozu (nicht dargestellte) Zementieraggregate zum Einsatz gelangen.After full alignment of the impermeable envelope 14, the pressure is released and the ball 18 (FIG. 3) is thrown into the production tube tour 5, which falls into the seat 12 of the bushing 10 arranged in the passage 7 of the transition 7. In the profile tube tour 5, the liquid pressure is increased again, under the influence of which the pins 13 are sheared off, and the bushing 10 moves into its lower end position (FIG. 3). Here, the liquid is displaced from the cavity 21 through the opening 9 into the annular space, so that the lateral openings 11 and 8 of the socket 10 and the transition 7 coincide with each other. The production tube tour 5 is then cemented using the conventional method, for which purpose cementing units (not shown) are used.

Nach dem Einpumpen einer berechneten Menge an Zementschlamm und seinem Aushärten hinter der Produktionsrohrtour werden die Elemente 10, 12 und 18 im Innern der Rohrtour 5 ausgebohrt. Anschließend wird die Produktions-Schicht nach bekannten Verfahren wie z.B. durch Perforation der Hülle wieder aufgeschlossen, und durch die Löcher 22 (Fig. 4) der Perforation wird das Produkt aus der Schicht 19 entnommen.After pumping in a calculated amount of cement slurry and curing it behind the production pipe tour, the elements 10, 12 and 18 are drilled out inside the pipe tour 5. The production layer is then processed using known methods such as opened again by perforation of the casing, and the product is removed from the layer 19 through the holes 22 (FIG. 4) of the perforation.

Claims (4)

  1. Method of securing the productive stratum in a deep bore, wherein:
    - the productive stratum (19) is opened up in the course of sinking a bore,
    - a fluid-tight casing (14) in the form of profile tubes is positioned in the region of the productive stratum and enlarged with the aid of an internal pressure,
    - a production tube tower (5) is installed in the bore hole and cemented, and
    - renewed opening-up of the stratum is carried out,
    characterised in that,
    - before the positioning of the fluid-tight casing (14), that section (20) of the deep bore which is located in the region of the productive stratum is widened by removal of the rock from the wall of the bore hole,
    - the production tube tower (5) is lowered only to the point where its lower end has safely entered the upper end part of the impermeable casing (14), while
    - the enlarging of the casing (14) is carried out by an internal pressure until its walls abut against the walls of the widened section (20) of the bore hole.
  2. Method according to claim 1, characterised in that the widening of the bore in the region of the productive stratum (19) takes place at the same time as the opening-up of the latter.
  3. Method according to claim 1, characterised in that the installation and insertion of the impermeable casing (14) in the region of the productive stratum (19) is carried out jointly with the production tube tower (5).
  4. Method according to claims 1 and 2, characterised in that that portion of the bore which is located in the region of the productive stratum (19) is widened by a factor of 1.5 to 2 times the external diameter of the production tube tower (5).
EP89902215A 1988-11-22 1988-11-22 Method of casing the production seam in a well Expired - Lifetime EP0397870B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/SU1988/000235 WO1990005832A1 (en) 1988-11-22 1988-11-22 Method of casing the production seam in a well
CA000606032A CA1320434C (en) 1988-11-22 1989-07-18 Method of casing off a producing formation in a well

Publications (3)

Publication Number Publication Date
EP0397870A1 EP0397870A1 (en) 1990-11-22
EP0397870A4 EP0397870A4 (en) 1991-12-27
EP0397870B1 true EP0397870B1 (en) 1997-02-05

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EP89902215A Expired - Lifetime EP0397870B1 (en) 1988-11-22 1988-11-22 Method of casing the production seam in a well

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US (1) US5031699A (en)
EP (1) EP0397870B1 (en)
JP (1) JP2703379B2 (en)
AU (1) AU613452B2 (en)
CA (1) CA1320434C (en)
DE (1) DE3855788D1 (en)
NO (1) NO300988B1 (en)
WO (1) WO1990005832A1 (en)

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Also Published As

Publication number Publication date
JPH03503302A (en) 1991-07-25
NO903218L (en) 1990-07-18
AU613452B2 (en) 1991-08-01
NO300988B1 (en) 1997-08-25
EP0397870A1 (en) 1990-11-22
EP0397870A4 (en) 1991-12-27
NO903218D0 (en) 1990-07-18
AU3052089A (en) 1990-06-12
WO1990005832A1 (en) 1990-05-31
DE3855788D1 (en) 1997-03-20
CA1320434C (en) 1993-07-20
US5031699A (en) 1991-07-16
JP2703379B2 (en) 1998-01-26

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