EP2821586B1 - Completion of a storage bore well - Google Patents

Completion of a storage bore well Download PDF

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Publication number
EP2821586B1
EP2821586B1 EP14170623.4A EP14170623A EP2821586B1 EP 2821586 B1 EP2821586 B1 EP 2821586B1 EP 14170623 A EP14170623 A EP 14170623A EP 2821586 B1 EP2821586 B1 EP 2821586B1
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Prior art keywords
pipe string
pipe
completion according
borehole completion
sleeve
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German (de)
French (fr)
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EP2821586A3 (en
EP2821586A2 (en
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RWE Deutschland AG
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RWE Deutschland AG
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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/14—Casing shoes for the protection of the bottom of the casing
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/005—Waste disposal systems
    • E21B41/0057—Disposal of a fluid by injection into a subterranean formation
    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells

Definitions

  • the invention relates to a well completion of a storage bore of a compressed air cavern, comprising a stand tube, an anchor tube, a feed tube tour of a first material and extending into the Druckluftkaverne conveyor tube.
  • WO 01/71157 A1 From the WO 01/71157 A1 is a submarine well completion for an oil or gas well.
  • the well completion described therein essentially corresponds to a conventional borehole completion of so-called production wells. These usually include a standpipe tour, an anchor pipe tour and a production pipe tour. Depending on the final depth of the drilling, the latter may comprise several intermediate pipe runs and one production pipe run, which comprises a liner pipe and a conveyor pipe or tubing.
  • the usual diameter of production pipes in production wells is between 6 5 ⁇ 8 and 9 5 ⁇ 8 inches.
  • caverns in salt deposits are also used as a compressed air storage, in analogy to pumped storage power plants in low load periods of the power network air is compressed in caverns and at peak load times the compressed air is working expanded. Efficiencies of about 70% should be achieved with such compressed air storage caverns.
  • the injection and removal of the compressed air can be done for example via appropriately trained holes as a connecting element between surface facilities and the salt cavern.
  • the wellbores may be subject to increased corrosion because the moist compressed air, unlike a fuel gas, is relatively corrosive.
  • the invention has for its object to provide a Bohrlochkomplett réelle a storage bore of a compressed air cavern, with which it is particularly possible to promote high pressure air flow and which is suitable for increased pressure cycling and for the promotion of a corrosive medium.
  • Bohrlochkomplett ist a storage bore of a compressed air cavern, comprising a stand tube, an anchor tube, a Futterrohrtour of a first material and extending into the Druck Kunststoffkaverne conveyor tube tour, wherein the Bohrlochkomplett réelle according to the invention is characterized in that the redesignertubeour as a casing shoe at its leading end in the storage bore each comprise a casing section or a casing section of a second corrosion-resistant material, which is different from the first material, that the casing shoe is connected via an insulating pipe sleeve made of a third material to the Futterrohrtour and that the third Material is different from the first and second material.
  • lining tube tour used here is used here correspondingly for the term “liner”, which is often used in specialist jargon.
  • the term “conveying tube” in the context of the present application is referred to in the jargon as Steigrohrtour or tubing. If the term “casing” is mentioned in the following text, this term refers to the individual pipe runs or pipe runs that form the permanent cemented down hole inventory.
  • the so-called casing or liner usually forms the last production pipe that is cemented in the well.
  • According to the invention is therefore intended to form the lining tube tour with a casing shoe made of a corrosion-resistant material, which is different from the first material of the rest of the lining tube tour.
  • At least one pipe section or pipe section or a pipe section is referred to, which forms the leading end of the relevant pipe run.
  • the casing of the Bohrlochkomplett ist according to the invention consists of a corrosion-resistant stainless steel.
  • a carbon steel can be provided.
  • the casing section of the first material is coated internally with a synthetic resin, for example with a polymer.
  • the annulus between the production tubing and the liner tube above the casing shoe is sealed against the compressed air cavern so that only the casing is exposed to the compressed air cavern.
  • the pipe sleeve is designed as a double sleeve, which receives in each case a threaded portion of a pipe section.
  • the pipe socket is made of a third material which is different from the first and second material, so that in this way reliable contact corrosion between the casing shoe and the remainder of the casing pipe route is avoided.
  • the pipe sleeve may for example be formed as a double sleeve, which receives in each case a threaded portion of a pipe section.
  • the pipe sleeve consists of a glass fiber reinforced polymer.
  • the pipe sleeve can be designed so that it overlaps the pipe sections to be joined together so that it is not exposed to any significant pressure cycling.
  • the conveyor tube may be sealed within the liner tube at the level of the sleeve or below the sleeve with a packer.
  • a packer Under a packer according to the present invention is an annular hydraulic, pneumatic or mechanically lockable shut-off to understand.
  • a packer for example, a permanent Casingpacker be provided.
  • Such Casingpacker or Casinghanger are known as so-called permanent packer or so-called retrievable packer in the art.
  • the conveyor tube may be made entirely of a corrosion resistant stainless steel.
  • the tailpipe of the conveyor tube extends into the cavern neck of the compressed air cavern.
  • the diameter of the production tubing may be about 16 inches, which is relatively large compared to a riser of a crude oil production well or natural gas production well.
  • a protective fluid for example, a protective gas or a protective liquid can be provided.
  • a protective gas for example, nitrogen is considered.
  • FIG. 1 schematically a storage hole 1 a compressed air cavern 2 is shown.
  • the compressed air cavern 2 is designed as a cavern in a salt deposit, which is used for injection and extraction of compressed air.
  • the injection and removal of the compressed air takes place via a conveyor tube 3, suspended at the wellhead via a so-called tubing hanger spool.
  • the Tubing Hanger Spool is a steel fitting which is flanged in a known manner to the wellhead and in which the conveyor tube 3 is dismounted or suspended.
  • the well completion according to the invention comprises, in a known manner, a standpipe 4, an anchor pipe 5 and a liner 6.
  • the stand tube 4 is a rammed tube tour, which serves only to secure the upper layers of sediment.
  • the Ankerrohrtour 5 takes in a known manner the loads of Casings on.
  • the Futterrohrtour 6 is cemented in the storage hole 1.
  • the Futterrohrtour 6 is suspended in the so-called Casing Head, which may be preceded by intermediate tube tours depending on the final depth of the storage hole 1 of the feed pipe 6.
  • the cemented tubular casing 6 serves primarily to stabilize the borehole and to hydraulically separate the horizons intersected by the storage well 1.
  • the delivery tube 3 is sealed by means of a packer 7.
  • the packer 7 is formed in the present case as a permanent packer with flexible seals.
  • the annular space 8 above the packer 7 is filled with an annular space protection medium, for example with an annular space protection fluid.
  • This serves to maintain a constant pressure distribution in the annular space 8 for the protection of the casing and the cement ring space 9.
  • the annular space protection fluid serves the corrosion protection of the Futterrohrtour 6 inside and the conveyor tube 3 outside.
  • the annular space protection liquid acts insulating, in the sense that it enables a minimization of temperature fluctuations during storage operation of the compressed air cavern 2.
  • a protective gas for example nitrogen, may be provided instead of an annular space protection liquid.
  • the liner tube 6 has a diameter of 20 inches over about 95% of the total installation length. This consists with the exception of a liner shoe 10 made of a non-alloy steel, which has a wall thickness of 16.13 mm and is internally provided with a plastic coating as corrosion protection.
  • the liner 6 includes a liner shoe 10, which may include one or more pipe sections made of alloyed stainless steel.
  • the liner shoe also has an outside diameter of 20 inches and is connected to the liner 6 by an insulating sleeve 11.
  • the insulating sleeve 11 is formed as a double sleeve with two socket ends and consists of a glass fiber reinforced plastic. This causes a galvanic separation between the lining tube 6 made of non-alloyed stainless steel and the liner shoe 10 made of stainless steel.
  • the conveyor tube 3 has an outside diameter of 16 inches over about 90% of its installation length and is made entirely in alloyed stainless steel.
  • the conveying tube 3 is sealed by means of the permanent packer 7 against the lining tube 6, wherein the packer 7 is installed approximately at the level of the insulating sleeve 11 or below the insulating sleeve 11, so that only the sheath 6 of the corrosive atmosphere of the compressed air cavern 2 exposed is.
  • the conveyor tube 3 is, as in particular the FIGS. 1 and 2 can be seen, led relatively far into the Kavernenhals 12, so that the fraudrohrtour 3 can be temporarily shut off there, for example, with a so-called Retrievable Bridge Plug 13.
  • a bridge plug is generally understood to mean a plug-type borehole closure which can be removed and released in the manner of a packer.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Description

Die Erfindung betrifft eine Bohrlochkomplettierung einer Speicherbohrung einer Druckluftkaverne, umfassend eine Standrohrtour, eine Ankerrohrtour, eine Futterrohrtour aus einem ersten Werkstoff und eine sich in die Druckluftkaverne erstreckende Förderrohrtour.The invention relates to a well completion of a storage bore of a compressed air cavern, comprising a stand tube, an anchor tube, a feed tube tour of a first material and extending into the Druckluftkaverne conveyor tube.

Solche Bohrlochkomplettierungen sind im Stand der Technik insbesondere für Öl- und Gasförderbohrungen in verschiedensten Ausführungen bekannt siehe US 3,796,044 .Such well completions are known in the art, especially for oil and gas wells in various designs see US 3,796,044 ,

Aus der WO 01/71157 A1 ist eine submarine Bohrlochkomplettierung für eine Öl-oder Gasförderbohrung bekannt. Die dort beschriebene Bohrlochkomplettierung entspricht im Wesentlichen einer üblichen Bohrlochkomplettierung von sogenannten Produktionsbohrungen. Diese umfassen üblicherweise eine Standrohrtour, eine Ankerrohrtour und eine Produktionsrohrtour. Letztere umfasst je nach Endteufe der Bohrung ggf. mehrere Zwischenrohrtouren und eine Produktionsrohrtour, die eine Futterrohrtour (Liner) und eine Förderrohrtour oder Steigrohrtour (Tubing) umfasst.From the WO 01/71157 A1 is a submarine well completion for an oil or gas well. The well completion described therein essentially corresponds to a conventional borehole completion of so-called production wells. These usually include a standpipe tour, an anchor pipe tour and a production pipe tour. Depending on the final depth of the drilling, the latter may comprise several intermediate pipe runs and one production pipe run, which comprises a liner pipe and a conveyor pipe or tubing.

Der übliche Durchmesser von Förderrohren bei Produktionsbohrungen betragen zwischen 6 ⅝ und 9 ⅝ Zoll.The usual diameter of production pipes in production wells is between 6 ⅝ and 9 ⅝ inches.

Ähnliche Bohrlochverrohungen und Komplettierungen finden bei der Sohleförderung aus Salzkavernen oder bei Kavernenbohrungen zwecks Ein- und Ausspeicherung von Brenngas Anwendung.Similar borehole threats and completions are used for the sole extraction from salt caverns or for cavern drilling for the injection and withdrawal of fuel gas.

Aus der EP 1 515 128 A1 sind ein Verfahren und eine Anordnung zur Prüfung der Dichtigkeit von Kavernenbohrungen bekannt.From the EP 1 515 128 A1 For example, a method and arrangement for testing the tightness of cavern holes are known.

Insbesondere Kavernen in Salzlagerstätten werden auch als Druckluftspeicher verwendet, wobei in Analogie zu Pumpspeicherkraftwerken in Schwachlastzeiten des Stromnetzes Luft in Kavernen verpresst wird und zu Spitzenlastzeiten die komprimierte Luft arbeitsleistend entspannt wird. Mit solchen Druckluftspeicherkavernen sollen Wirkungsgrade von etwa 70 % erzielt werden.In particular, caverns in salt deposits are also used as a compressed air storage, in analogy to pumped storage power plants in low load periods of the power network air is compressed in caverns and at peak load times the compressed air is working expanded. Efficiencies of about 70% should be achieved with such compressed air storage caverns.

Die Injektion und Entnahme der komprimierten Luft kann beispielsweise über entsprechend ausgebildete Bohrungen als Verbindungselement zwischen übertägigen Einrichtungen und der Salzkaverne erfolgen.The injection and removal of the compressed air can be done for example via appropriately trained holes as a connecting element between surface facilities and the salt cavern.

Anders als bei der Ein- und Ausspeicherung von Erdgas in Salzkavernen ist es beim Betrieb von Druckluftspeicherkavernen erforderlich, höhere Volumenströme zu realisieren. Darüber hinaus ergeben sich bei der Förderung von größeren Volumenströmen erhöhte Reibungsdruckverluste und höhere Druckwechselbeanspruchungen des Casings.Unlike the storage and retrieval of natural gas in salt caverns, the operation of compressed air storage caverns requires higher volume flows. In addition, resulting in the promotion of larger volume flows increased friction pressure losses and higher pressure cycling of Casings.

Schließlich sind die Bohrlocheinbauten unter Umständen einer erhöhten Korrosion ausgesetzt, da die feuchte Druckluft im Gegensatz zu einem Brenngas verhältnismäßig korrosiv ist.Finally, the wellbores may be subject to increased corrosion because the moist compressed air, unlike a fuel gas, is relatively corrosive.

Der Erfindung liegt die Aufgabe zugrunde, eine Bohrlochkomplettierung einer Speicherbohrung einer Druckluftkaverne bereitzustellen, mit der es insbesondere möglich ist, hohe Druckluftvolumenströme zu fördern und die für eine erhöhte Druckwechselbeanspruchung sowie für die Förderung eines korrosiven Mediums geeignet ist.The invention has for its object to provide a Bohrlochkomplettierung a storage bore of a compressed air cavern, with which it is particularly possible to promote high pressure air flow and which is suitable for increased pressure cycling and for the promotion of a corrosive medium.

Die der Erfindung zugrundeliegende Aufgabe wird gelöst durch eine Bohrlochkomplettierung einer Speicherbohrung einer Druckluftkaverne, umfassend eine Standrohrtour, eine Ankerrohrtour, eine Futterrohrtour aus einem ersten Werkstoff und eine sich in die Druckluftkaverne erstreckende Förderrohrtour, wobei sich die Bohrlochkomplettierung gemäß der Erfindung dadurch auszeichnet, dass die Förderrohrtour als Futterrohrschuh an ihrem in der Speicherbohrung führenden Ende jeweils einen Futterrohrschuss oder eine Futterrohrsektion aus einem zweiten korrosionsbeständigen Werkstoff umfasst, der von dem ersten Werkstoff verschieden ist, dass der Futterrohrschuh über eine isolierende Rohrmuffe aus einem dritten Werkstoff an die Futterrohrtour angeschlossen ist und dass der dritte Werkstoff von dem ersten und zweiten Werkstoff verschieden ist.The problem underlying the invention is achieved by a Bohrlochkomplettierung a storage bore of a compressed air cavern, comprising a stand tube, an anchor tube, a Futterrohrtour of a first material and extending into the Druckluftkaverne conveyor tube tour, wherein the Bohrlochkomplettierung according to the invention is characterized in that the Förderertubeour as a casing shoe at its leading end in the storage bore each comprise a casing section or a casing section of a second corrosion-resistant material, which is different from the first material, that the casing shoe is connected via an insulating pipe sleeve made of a third material to the Futterrohrtour and that the third Material is different from the first and second material.

Der hier verwendete Begriff "Futterrohrtour" wird hier entsprechend für den im Fachjargon häufig verwendeten Begriff "Liner" verwendet. Der Begriff "Förderrohrtour" im Sinne der vorliegenden Anmeldung wird im Fachjargon auch als Steigrohrtour oder Tubing bezeichnet. Wenn im folgenden Text der Begriff "Casing" erwähnt ist, so bezeichnet dieser Begriff die einzelnen Rohrfahrten bzw. Rohrtouren, die das permanente einzementierte Bohrlochinventar bilden.The term "lining tube tour" used here is used here correspondingly for the term "liner", which is often used in specialist jargon. The term "conveying tube" in the context of the present application is referred to in the jargon as Steigrohrtour or tubing. If the term "casing" is mentioned in the following text, this term refers to the individual pipe runs or pipe runs that form the permanent cemented down hole inventory.

Das sogenannte Futterrohr bzw. der Liner bildet üblicherweise die letzte Produktionsrohrtour, die im Bohrloch zementiert ist.The so-called casing or liner usually forms the last production pipe that is cemented in the well.

Insbesondere die letzte zementierte Futterrohrtour muss besondere Anforderungen hinsichtlich Kollaps- und Innendruckfestigkeit sowie hinsichtlich Korrosionsbeständigkeit erfüllen.In particular, the last cemented lining tube tour must meet special requirements in terms of collapse and internal pressure resistance and corrosion resistance.

Erfindungsgemäß ist deshalb vorgesehen, die Futterrohrtour mit einem Futterrohrschuh aus einem korrosionsbeständigen Werkstoff auszubilden, der von dem ersten Werkstoff der übrigen Futterrohrtour verschieden ist.According to the invention is therefore intended to form the lining tube tour with a casing shoe made of a corrosion-resistant material, which is different from the first material of the rest of the lining tube tour.

Als Rohrschuh im Sinne der vorliegenden Anmeldung wird wenigstens ein Rohrabschnitt oder Rohrschuss oder eine Rohrsektion bezeichnet, der das führende Ende der betreffenden Rohrtour bildet.As a pipe shoe in the context of the present application, at least one pipe section or pipe section or a pipe section is referred to, which forms the leading end of the relevant pipe run.

Besonders zweckmäßig und vorteilhaft ist es, wenn der Futterrohrschuh der Bohrlochkomplettierung gemäß der Erfindung aus einem korrosionsbeständigen Edelstahl besteht.It is particularly expedient and advantageous if the casing of the Bohrlochkomplettierung according to the invention consists of a corrosion-resistant stainless steel.

Als erster Werkstoff kann beispielsweise ein unlegierter Stahl vorgesehen sein.As the first material, for example, a carbon steel can be provided.

Besonders vorteilhaft ist es, wenn die Futterrohrsektion aus dem ersten Werkstoff innen mit einem Kunstharz, beispielsweise mit einem Polymer beschichtet sind.It is particularly advantageous if the casing section of the first material is coated internally with a synthetic resin, for example with a polymer.

Zweckmäßigerweise ist der Ringraum zwischen der Förderrohrtour und der Futterrohrtour oberhalb des Futterrohrschuhs gegen die Druckluftkaverne abgedichtet, sodass nur der Futterrohrschuh zur Druckluftkaverne exponiert ist.Conveniently, the annulus between the production tubing and the liner tube above the casing shoe is sealed against the compressed air cavern so that only the casing is exposed to the compressed air cavern.

Bei einer besonders vorteilhaften Variante der Bohrlochkomplettierung gemäß der Erfindung ist vorgesehen, dass die Rohrmuffe als Doppelmuffe ausgebildet ist, die jeweils einen Gewindeabschnitt einer Rohrsektion aufnimmt.In a particularly advantageous variant of the borehole completion according to the invention, it is provided that the pipe sleeve is designed as a double sleeve, which receives in each case a threaded portion of a pipe section.

Wie vorstehend bereits erwähnt, besteht die Rohrmuffe aus einem dritten Werkstoff, der von dem ersten und zweiten Werkstoff verschieden ist, sodass auf diese Art und Weise zuverlässig eine Kontaktkorrosion zwischen dem Futterrohrschuh und dem Rest der Futterrohrtour vermieden wird.As already mentioned above, the pipe socket is made of a third material which is different from the first and second material, so that in this way reliable contact corrosion between the casing shoe and the remainder of the casing pipe route is avoided.

Die Rohrmuffe kann beispielsweise als Doppelmuffe ausgebildet sein, die jeweils einen Gewindeabschnitt einer Rohrsektion aufnimmt.The pipe sleeve may for example be formed as a double sleeve, which receives in each case a threaded portion of a pipe section.

Bei einer besonders vorteilhaften Variante ist vorgesehen, dass die Rohrmuffe aus einem glasfaserverstärkten Polymer besteht. Die Rohrmuffe kann dabei so ausgebildet sein, dass sie die aneinander anzuschließenden Rohrsektionen so übergreift, dass sie keinen nennenswerten Druckwechselbeanspruchungen ausgesetzt ist.In a particularly advantageous variant it is provided that the pipe sleeve consists of a glass fiber reinforced polymer. The pipe sleeve can be designed so that it overlaps the pipe sections to be joined together so that it is not exposed to any significant pressure cycling.

Die Förderrohrtour kann beispielsweise innerhalb der Futterrohrtour auf der Höhe der Muffe oder unterhalb der Muffe mit einem Packer abgedichtet sein. Unter einem Packer im Sinne der vorliegenden Erfindung ist ein ringförmiges hydraulisch, pneumatisch oder mechanisch verriegelbares Absperrelement zu verstehen. Als Packer kann beispielsweise ein Permanent Casingpacker vorgesehen sein. Solche Casingpacker oder auch Casinghanger sind als sogenannte Permanentpacker oder sogenannte Retrievable Packer im Stand der Technik bekannt.For example, the conveyor tube may be sealed within the liner tube at the level of the sleeve or below the sleeve with a packer. Under a packer according to the present invention is an annular hydraulic, pneumatic or mechanically lockable shut-off to understand. As a packer, for example, a permanent Casingpacker be provided. Such Casingpacker or Casinghanger are known as so-called permanent packer or so-called retrievable packer in the art.

Bei einer weiterhin vorteilhaften Variante der Bohrlochkomplettierung gemäß der Erfindung ist vorgesehen, dass das Endrohr der Förderrohrtour als Tauchrohr in die Druckluftkaverne hineingeführt ist.In a further advantageous variant of the Bohrlochkomplettierung according to the invention it is provided that the tailpipe of the conveyor tube is guided into the compressed air cavern as a dip tube.

Die Förderrohrtour kann beispielsweise vollständig aus einem korrosionsbeständigen Edelstahl bestehen.For example, the conveyor tube may be made entirely of a corrosion resistant stainless steel.

Bei einer bevorzugten Variante der Erfindung erstreckt sich das Endrohr der Förderrohrtour in den Kavernenhals der Druckluftkaverne. Der Durchmesser der Förderrohrtour kann beispielsweise etwa 16 Zoll betragen, was verglichen mit einer Steigrohrtour einer Erdölproduktionsbohrung oder Erdgasproduktionsbohrung verhältnismäßig groß ist.In a preferred variant of the invention, the tailpipe of the conveyor tube extends into the cavern neck of the compressed air cavern. For example, the diameter of the production tubing may be about 16 inches, which is relatively large compared to a riser of a crude oil production well or natural gas production well.

Besonders vorteilhaft ist es, wenn der Ringraum zwischen der Förderrohrtour und der Futterrohrtour oberhalb der Abdichtung zur Druckluftkaverne mit einem Schutzfluid gefüllt ist. Als Schutzfluid kann beispielsweise ein Schutzgas oder eine Schutzflüssigkeit vorgesehen sein. Als Schutzgas kommt beispielsweise Stickstoff in Betracht.It is particularly advantageous if the annular space between the conveying tube track and the liner tube above the seal for the compressed air cavern is filled with a protective fluid. As a protective fluid, for example, a protective gas or a protective liquid can be provided. As a protective gas, for example, nitrogen is considered.

Die Erfindung wird nachstehend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels erläutert.The invention will be explained below with reference to an embodiment shown in the drawings.

Es zeigen:

Figur 1
eine schematische Schnittansicht durch eine Bohrlochkomplettierung gemäß der Erfindung,
Figur 2
eine vergrößerte Ansicht der in Figur 1 dargestellten Komplettierung im Bereich eines den Förderrohrstrang abdichtenden Packers und
Figur 3
eine vergrößerte Detailansicht des Details III in Figur 2.
Show it:
FIG. 1
a schematic sectional view through a Bohrlochkomplettierung according to the invention,
FIG. 2
an enlarged view of the in FIG. 1 illustrated completion in the area of a conveyor pipe string sealing packer and
FIG. 3
an enlarged detail view of the detail III in FIG. 2 ,

In Figur 1 ist schematisch eine Speicherbohrung 1 einer Druckluftkaverne 2 dargestellt. Die Druckluftkaverne 2 ist als Kaverne in einer Salzlagerstätte ausgebildet, wobei diese zur Injektion und Entnahme komprimierter Luft dient. Die Injektion und Entnahme der komprimierten Luft erfolgt über eine Förderrohrtour 3, am Bohrlochkopf über einen sogenannten Tubing Hanger Spool abgehängt. Der Tubing Hanger Spool ist ein Stahlfitting, der in bekannter Art und Weise an den Bohrlochkopf angeflanscht ist und in welchem die Förderrohrtour 3 abgelandet ist bzw. abgehängt ist.In FIG. 1 schematically a storage hole 1 a compressed air cavern 2 is shown. The compressed air cavern 2 is designed as a cavern in a salt deposit, which is used for injection and extraction of compressed air. The injection and removal of the compressed air takes place via a conveyor tube 3, suspended at the wellhead via a so-called tubing hanger spool. The Tubing Hanger Spool is a steel fitting which is flanged in a known manner to the wellhead and in which the conveyor tube 3 is dismounted or suspended.

Der Bohrlochkopf ist in den Zeichnungen aus Gründen der vereinfachten Darstellung nicht gezeigt.The wellhead is not shown in the drawings for the sake of simplicity.

Die Bohrlochkomplettierung gemäß der Erfindung umfasst in bekannter Art und Weise eine Standrohrtour 4, eine Ankerrohrtour 5 sowie eine Futterrohrtour 6.The well completion according to the invention comprises, in a known manner, a standpipe 4, an anchor pipe 5 and a liner 6.

Die Standrohrtour 4 ist eine gerammte Rohrtour, die lediglich der Sicherung der oberen Sedimentschichten dient. Die Ankerrohrtour 5 nimmt in bekannter Art und Weise die Lasten des Casings auf.The stand tube 4 is a rammed tube tour, which serves only to secure the upper layers of sediment. The Ankerrohrtour 5 takes in a known manner the loads of Casings on.

Die Futterrohrtour 6 ist in der Speicherbohrung 1 zementiert.The Futterrohrtour 6 is cemented in the storage hole 1.

Die Futterrohrtour 6 ist im sogenannten Casing Head abgehängt, wobei je nach Endteufe der Speicherbohrung 1 der Futterrohrtour 6 ggf. auch Zwischenrohrtouren vorgeschaltet sein können.The Futterrohrtour 6 is suspended in the so-called Casing Head, which may be preceded by intermediate tube tours depending on the final depth of the storage hole 1 of the feed pipe 6.

Die zementierte Futterrohrtour 6 dient in erster Linie der Stabilisierung des Bohrlochs und der hydraulischen Trennung der von der Speicherbohrung 1 durchteuften Horizonte. Innerhalb der Futterrohrtour 6 ist die Förderrohrtour 3 mittels eines Packers 7 abgedichtet.The cemented tubular casing 6 serves primarily to stabilize the borehole and to hydraulically separate the horizons intersected by the storage well 1. Within the tubular casing 6, the delivery tube 3 is sealed by means of a packer 7.

Der Packer 7 ist im vorliegenden Fall als Permanentpacker mit flexiblen Dichtungen ausgebildet. Der Ringraum 8 oberhalb des Packers 7 ist mit einem Ringraumschutzmedium, beispielsweise mit einer Ringraumschutzflüssigkeit gefüllt. Diese dient der Aufrechterhaltung einer konstanten Druckverteilung in dem Ringraum 8 zum Schutz des Casings und des Zementringraums 9. Darüber hinaus dient die Ringraumschutzflüssigkeit dem Korrosionsschutz der Futterrohrtour 6 innen und der Förderrohrtour 3 außen. Schließlich wirkt die Ringraumschutzflüssigkeit isolierend, in dem Sinne, dass sie eine Minimierung von Temperaturschwankungen beim Speicherbetrieb der Druckluftkaverne 2 ermöglicht.The packer 7 is formed in the present case as a permanent packer with flexible seals. The annular space 8 above the packer 7 is filled with an annular space protection medium, for example with an annular space protection fluid. This serves to maintain a constant pressure distribution in the annular space 8 for the protection of the casing and the cement ring space 9. In addition, the annular space protection fluid serves the corrosion protection of the Futterrohrtour 6 inside and the conveyor tube 3 outside. Finally, the annular space protection liquid acts insulating, in the sense that it enables a minimization of temperature fluctuations during storage operation of the compressed air cavern 2.

Anstelle einer Ringraumschutzflüssigkeit kann auch ein Schutzgas, beispielsweise Stickstoff, vorgesehen sein.Instead of an annular space protection liquid, a protective gas, for example nitrogen, may be provided.

Bei dem beschriebenen Ausführungsbeispiel besitzt die Futterrohrtour 6 einen Durchmesser von 20 Zoll über etwa 95 % der gesamten Einbaulänge. Diese besteht mit Ausnahme eines Futterrohrschuhs 10 aus einem nicht legierten Stahl, der eine Wanddicke von 16,13 mm aufweist und innen mit einer Kunststoffbeschichtung als Korrosionsschutz versehen ist.In the described embodiment, the liner tube 6 has a diameter of 20 inches over about 95% of the total installation length. This consists with the exception of a liner shoe 10 made of a non-alloy steel, which has a wall thickness of 16.13 mm and is internally provided with a plastic coating as corrosion protection.

Wie dies insbesondere der Figur 3 zu entnehmen ist, umfasst die Futterrohrtour 6 einen Futterrohrschuh 10, der einen oder mehrere Rohrsektionen umfassen kann, die aus einem legierten Edelstahl bestehen. Der Futterrohrschuh besitzt ebenfalls einen Außendurchmesser von 20 Zoll und ist mit einer Isoliermuffe 11 an die Futterrohrtour 6 angeschlossen. Die Isoliermuffe 11 ist als Doppelmuffe mit zwei Muffenenden ausgebildet und besteht aus einem glasfaserverstärktem Kunststoff. Diese bewirkt eine galvanische Trennung zwischen der Futterrohrtour 6 aus nicht legiertem Edelstahl und dem Futterrohrschuh 10 aus Edelstahl.How this in particular the FIG. 3 2, the liner 6 includes a liner shoe 10, which may include one or more pipe sections made of alloyed stainless steel. The liner shoe also has an outside diameter of 20 inches and is connected to the liner 6 by an insulating sleeve 11. The insulating sleeve 11 is formed as a double sleeve with two socket ends and consists of a glass fiber reinforced plastic. This causes a galvanic separation between the lining tube 6 made of non-alloyed stainless steel and the liner shoe 10 made of stainless steel.

Die Förderrohrtour 3 besitzt einen Außendurchmesser von 16 Zoll über etwa 90 % ihrer Einbaulänge und ist vollständig in legiertem Edelstahl ausgeführt.The conveyor tube 3 has an outside diameter of 16 inches over about 90% of its installation length and is made entirely in alloyed stainless steel.

Wie vorstehend bereits erwähnt, ist die Förderrohrtour 3 mittels des permanenten Packers 7 gegen die Futterrohrtour 6 abgedichtet, wobei der Packer 7 etwa auf Höhe der Isoliermuffe 11 oder unterhalb der Isoliermuffe 11 eingebaut ist, sodass nur der Futterrohrschuh 6 der korrodierenden Atmosphäre der Druckluftkaverne 2 ausgesetzt ist.As already mentioned above, the conveying tube 3 is sealed by means of the permanent packer 7 against the lining tube 6, wherein the packer 7 is installed approximately at the level of the insulating sleeve 11 or below the insulating sleeve 11, so that only the sheath 6 of the corrosive atmosphere of the compressed air cavern 2 exposed is.

Die Förderrohrtour 3 ist, wie dies insbesondere den Figuren 1 und 2 zu entnehmen ist, verhältnismäßig weit in den Kavernenhals 12 hineingeführt, sodass sich die Förderrohrtour 3 dort beispielsweise mit einem sogenannten Retrievable Bridge Plug 13 temporär absperren lässt. Unter einem Bridge Plug versteht man im Allgemeinen einen stopfenartigen Bohrlochverschluss, der nach Art eines Packers absetzbar und lösbar ist.The conveyor tube 3 is, as in particular the FIGS. 1 and 2 can be seen, led relatively far into the Kavernenhals 12, so that the Förderrohrtour 3 can be temporarily shut off there, for example, with a so-called Retrievable Bridge Plug 13. A bridge plug is generally understood to mean a plug-type borehole closure which can be removed and released in the manner of a packer.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Speicherbohrungmemory hole
22
DruckluftkaverneDruckluftkaverne
33
FörderrohrtourProduction tubing tour
44
StandrohrtourStandpipe Tour
55
AnkerrohrtourArmature tube Tour
66
FutterrohrtourCasing string
77
Packerpacker
88th
Ringraumannulus
99
ZementringraumCement annulus
1010
FutterrohrschuhCasing shoe
1111
Isoliermuffeinsulating sleeve
1212
Kavernenhalscaverns neck
1313
Bridge PlugBridge plug

Claims (12)

  1. Borehole completion of a storage bore (1) of a compressed-air cavern (2) comprising a standing pipe string (4), an anchor pipe string (5) a lining pipe string (6) of a first material and a conveying pipe string (3) extending into the compressed-air cavern (2), characterized in that the lining pipe string (6) comprises, as lining pipe shoe (10) at its leading end in the storage bore (1), at least one lining pipe section of a second corrosion-resistant material which is different from the first material, in that the lining pipe shoe (10) is connected to the lining pipe string (6) via a pipe sleeve of a third material, and in that the third material is different from the first and second material.
  2. Borehole completion according to Claim 1, characterized in that the lining pipe shoe (10) is composed of corrosion-resistant stainless steel and/or in that the first material is an unalloyed steel.
  3. Borehole completion according to either of Claims 1 and 2, characterized in that the lining pipe sections made of the first material are coated with a synthetic resin, for example with a polymer.
  4. Borehole completion according to one of Claims 1 to 3, characterized in that the annular space (8) between the conveying pipe string (3) and the lining pipe string (6) is sealed with respect to the compressed-air cavern (2) above the lining pipe shoe (10).
  5. Borehole completion according to one of Claims 1 to 4, characterized in that the pipe sleeve takes the form of a double sleeve which receives a respective threaded portion of a pipe section.
  6. Borehole completion according to one of Claims 1 to 5, characterized in that the pipe sleeve is composed of a glass-fibre-reinforced polymer.
  7. Borehole completion according to one of Claims 1 to 6, characterized in that the conveying pipe string (3) is sealed within the lining pipe string (6) with a packer (7) at the level of the sleeve or below the sleeve, preferably in that the packer (7) provided is a permanent packer.
  8. Borehole completion according to one of Claims 1 to 7, characterized in that the end pipe of the conveying pipe string (6) is introduced as a dip pipe into the compressed-air cavern (2).
  9. Borehole completion according to one of Claims 1 to 8, characterized in that the conveying pipe string (3) is entirely composed of corrosion-resistant stainless steel.
  10. Borehole completion according to one of Claims 1 to 9, characterized in that the annular space (8) between the conveying pipe string (3) and the lining pipe string (6) is filled with a protective fluid.
  11. Borehole completion according to Claim 10, characterized in that the protective fluid provided is a protective gas or a protective liquid.
  12. Borehole completion according to one of Claims 1 to 11, characterized in that the conveying pipe string can be shut off at its leading end.
EP14170623.4A 2013-07-04 2014-05-30 Completion of a storage bore well Active EP2821586B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013011156.0A DE102013011156A1 (en) 2013-07-04 2013-07-04 Borehole completion of a storage well

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EP2821586A2 EP2821586A2 (en) 2015-01-07
EP2821586A3 EP2821586A3 (en) 2015-02-25
EP2821586B1 true EP2821586B1 (en) 2016-08-31

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EP (1) EP2821586B1 (en)
DE (1) DE102013011156A1 (en)
DK (1) DK2821586T3 (en)
ES (1) ES2604126T3 (en)
PL (1) PL2821586T3 (en)
PT (1) PT2821586T (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108438A (en) * 1958-08-08 1963-10-29 Socony Mobil Oil Co Inc Methods of and apparatus for operation of storage wells
DE2116850A1 (en) * 1971-04-06 1972-10-19 Kraftwerk Union Ag Gas turbine air storage system
DE4302643A1 (en) * 1993-01-30 1994-08-04 Solvay Salz Gmbh Process for emptying brine with simultaneous pneumatic support of salt caverns
US6419018B1 (en) 2000-03-17 2002-07-16 Halliburton Energy Services, Inc. Subterranean well completion apparatus with flow assurance system and associated methods
EP1515128A1 (en) 2003-09-12 2005-03-16 GESO Gesellschaft für Sensorik, Geotechnischen Umweltschutz und Mathematische Modellierung mbH, Jena Method and Apparatus for testing the sealing of underground cavern pipeworks
EP2235418A4 (en) * 2007-12-28 2012-09-05 Robroy Ind Inc High pressure pipe liner coupling assembly and method
US20100230902A1 (en) * 2009-03-12 2010-09-16 Baker Hughes Incorporated Downhole sealing device and method of making

Also Published As

Publication number Publication date
EP2821586A3 (en) 2015-02-25
PT2821586T (en) 2016-11-23
PL2821586T3 (en) 2017-02-28
EP2821586A2 (en) 2015-01-07
DE102013011156A1 (en) 2015-01-08
ES2604126T3 (en) 2017-03-03
DK2821586T3 (en) 2016-12-12

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