EP0841266B1 - Method and device for flooding of gas storage caverns - Google Patents

Method and device for flooding of gas storage caverns Download PDF

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Publication number
EP0841266B1
EP0841266B1 EP19970250323 EP97250323A EP0841266B1 EP 0841266 B1 EP0841266 B1 EP 0841266B1 EP 19970250323 EP19970250323 EP 19970250323 EP 97250323 A EP97250323 A EP 97250323A EP 0841266 B1 EP0841266 B1 EP 0841266B1
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EP
European Patent Office
Prior art keywords
cavern
pipe
flood
liquid column
pressure
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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EP19970250323
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German (de)
French (fr)
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EP0841266A2 (en
EP0841266A3 (en
Inventor
Bernd Ing. Faske
Detlef Dipl.-Ing. Miersch
Gernot Dipl.-Ing. Jäpel
Frank Dr. Dipl.-Ing. Heinze
Helfried Dipl.-Geol. Zipper
Claudius Dipl.-Ing. Arnold
Gerd Dipl.-Ing. Hänsler
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Untergrundspeicher und Geotechnologie Systeme GmbH
VNG Verbuhdbetz Gas AG
Original Assignee
UNTERGRUNDSPEICHER und GEOTECH
Untergrundspeicher und Geotechnologie Systeme GmbH
VNG Verbuhdbetz Gas AG
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Publication of EP0841266A2 publication Critical patent/EP0841266A2/en
Publication of EP0841266A3 publication Critical patent/EP0841266A3/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/005Waste disposal systems
    • E21B41/0057Disposal of a fluid by injection into a subterranean formation

Definitions

  • the invention relates to a method and a device for flooding gas-filled storage caverns Implementation of renovation or reconstruction work.
  • a gas cavern by continuing Brine work is generally flooding the cavern cavity.
  • the invention has for its object a method and a device for flooding a cavern develop that pose no risk from mountain formwork are exposed to pressure-dependent use Controlled safety shut-off valves as a requirement automated operational management for flooding the cavern allow a constantly hydraulic Securing against pressure in the cavern Ensure gas and in the nominal current range avoid tearing off the flood current.
  • the object is achieved by a method according to the features of claim 1 and by a Device according to the features of claim 6 solved. Further advantageous training of the Invention emerge from the subclaims 2 to 5 and 7 to 11.
  • this pillar becomes one hydrostatic, the cavern internal pressure automatically compensating liquid column that the cavern hydraulically closed.
  • the device according to the invention includes a flood line from an outer and one Inner tube, its tube cross-sections during installation into the cavern, which is under internal pressure are secured against gas breakdown.
  • Into the outer tube preferably on the pipe shoe pullable stopper is closed and overflow openings to the outer annulus between the outer tube and the piping of the cavern bore is the inner tube above the overflow openings mounted that an inner annulus arises, the of the flood medium in the reverse flow direction can be flowed through.
  • the liquid column in a lower section of the flood line between the tubular shoe of the outer tube and the tubing string hanger of the inner tube forms a hydraulic lock opposite the internal pressure in the cavern and prevented so the gas entry into the flood line and over the flood line in the cavern head.
  • a Pipe segment arranged to adjust the flow resistance serves in the entire flood line.
  • the pipe segment is also in the tubing string hanger of the inner tube and with Equipped with means for connecting further pipe segments.
  • Throttle elements are used, which are preferred to be arranged in the area of the interchangeable pipe segment are.
  • the one to be used to flood the storage cavern Flood medium is through the inner tube of the flood line supplied, flows from the foot area of the inner tube in the inner annulus between the outer and the Inner tube and then rises in this annulus up to the level of the overflow openings of the outer tube and from there it passes through the outer annulus between the outer tube and the piping of the cavern bore into the cavern.
  • the device according to the invention has in its Execution no mechanically moving equipment parts and is therefore completely not susceptible to repairs.
  • the flood line with which the liquid column in Dependency on yourself during the flood process changing internal pressure of the cavern set up automatically offers absolute security against Gas kickback in the cavern head and against pressure surge into the entire pipe system for flooding the cavern.
  • the solution according to the invention ensures a continuous storage of the in the cavern to manufacture and maintain the geomechanically conditional minimum internal pressure of existing gas volume, whereby a further advantage can be achieved.
  • the invention enables the cavern to be flooded with a liquid medium, preferably with a fully saturated one Brine.
  • the invention is intended to be based on an exemplary embodiment are explained in more detail.
  • the Associated Drawing shows the flood line according to the invention Flood a storage cavern and to build one the inside pressure of the cavern compensating liquid column in a schematic representation.
  • the cavern 19 with the cavern bore 16 and the cavern sump 20, for example served as a storage for a gaseous medium, to flood completely.
  • the stored gaseous Medium was partially outsourced in a known manner.
  • the cavern 19 is a geomechanically necessary Internal pressure remained.
  • the invention is based a flood line in the cased cavern bore 16 13 installed, which consists of an outer tube 10, the on the tubular shoe 5 with a suitable, pullable plug 4 is hermetically sealed, and off an inner tube 9, which is by means of tubing string hangers 7 above overflow openings 8 close to Outer tube 10 is inserted.
  • tubing string hanger 7 In the tubing string hanger 7 is another, in its length and its tube cross section variable Pipe segment 15 arranged interchangeably, with which the Flow resistance in the flood line 13 for installation a liquid column depending on the actual conditions set on site and can be regulated.
  • Cavern bore 16 Before installing the flood line 13 in the gas-filled and under the internal pressure of the cavern 19 Cavern bore 16 becomes the inner tube 9 on the tubular shoe 6 temporarily with a pullable plug 14 locked to prevent that during the Installation of gaseous storage medium on the cavern head 17 can emerge.
  • the outer tube 10 of the flood line 13 is known Way through the stuffing box one at a time Cavern head 17 mounted high pressure lock - not shown - in common pipe lengths up to depth the overflow bores 8 into the cavern bore 16 built-in. Then the inner tube 9 with the tubing string hanger 7, the inner tube 9 compared to the Seals outer tube 10, introduced into the outer tube 10. Then the further installation of the Outer tube 10 with the help of the high pressure lock to the intended depth of the tubular shoe 5 within an area that is safe against mountain formwork of the cavern roof 1.
  • the cavern bore 16 has been suspended the tube segment 15 which is variable in its dimensions installed in the outer tube 10 and tight from above the tubing string hanger 7 inserted and parked.
  • the head 28 of the pipe segment 15 is preferably included known means for connecting further Pipe segments for setting and regulating the Flow resistances for the establishment of the liquid column equipped in flood line 13.
  • throttle elements 30 can also be provided above the tubing string hanger 7 in the pipe segment 15 are to be arranged.
  • the high-pressure lock is dismantled and the cavern head 17 gas-tight with the brine pump line 23 and the gas delivery line 24 connected. After that the temporary plug 14 by known means removed from the inner tube 9.
  • the quantities of residual gas to be removed flow in counterflow 25 over the outer annular space 11 to the cavern head 17 and are equipped with a shut-off valve 18 Gas delivery line 24 of a drying plant and then the intended use fed.
  • the equipment for caverns at the cavern head an automatically closing security system equip that upon reaching security guaranteeing limit switches off.
  • the prerequisites for the use of simple safety devices for example a safety shut-off valve 21, are created, which allow the processes occurring when the cavern is flooded to be economically switched off via p max limit values and are arranged in safe areas of a cavern to be flooded above the top of the cavern can.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Pipe Accessories (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Fluten von gasgefüllten Speicherkavernen zur Durchführung von Sanierungs- oder Rekonstruktionsarbeiten.The invention relates to a method and a device for flooding gas-filled storage caverns Implementation of renovation or reconstruction work.

Voraussetzung für die Durchführung von Reparaturarbeiten, Rekomplettierungen und insbesondere Hohlraumvergrößerungen einer Gaskaverne durch weiterführende Solarbeiten ist im allgemeinen ein Fluten des Kavernenhohlraumes.Prerequisite for carrying out repair work, Recompletion and in particular enlargement of the cavity a gas cavern by continuing Brine work is generally flooding the cavern cavity.

An Kavernen zur Speicherung gasförmiger Medien, bei denen während und nach einer vollständigen Auslagerung des Speichergutes zur Sicherung des anstehenden Gebirges ein Mindestinnendruck weiter aufrechterhalten werden muß, ist ein Fluten mit den bisher bekannten Verfahren und Einrichtungen aufgrund des vorhandenen Mindestinnendruckes nicht ohne weiteres durchführbar. At caverns for storing gaseous media, at those during and after full outsourcing of the stored goods to secure the upcoming Maintain a minimum internal pressure in the mountains must be a flooding with the previously known Procedures and facilities based on the existing Minimum internal pressure not easily feasible.

Eine mögliche Lösung für dieses Problem könnte darin bestehen, eine Rohrtour bis in den Bereich des soleüberfluteten Kavernensumpfes in die gasgefüllte Kaverne einzubauen und anschließend die Kaverne vollständig zu fluten, wobei die unter dem Sicherheits-Mindestinnendruck stehende Restmenge des gasförmigen Speichermediums während des Flutprozesses über den Ringraum zwischen der eingebauten Rohrtour und der Förderrohrtour kontinuierlich oder diskontinuierlich abfließen könnte.A possible solution to this problem could be in there exist, a pipe tour to the area of the brine-flooded Cavern sump in the gas-filled Install the cavern and then the cavern to flood completely, being below the minimum safety internal pressure standing residual amount of the gaseous Storage medium during the flood process the annulus between the built tube tour and the conveyor tube tour continuously or discontinuously could drain off.

Diese Lösungsvariante ist aber nicht uneingeschränkt anwendbar.However, this solution variant is not unlimited applicable.

Einerseits besteht die Gefahr, daß die bis zum Kavernensumpf reichende Flutrohrtour durch Gebirgsabschalungen während des Flutvorganges so schwer beschädigt wird, daß das in der Kaverne unter Kaverneninnendruck anstehende gasförmige Speichermedium schlagartig in die Flutrohr eindringt oder die Rohrtour vollständig abgeschlagen wird.On the one hand, there is a risk that the up to the cavern swamp Reaching flood pipe tour through mountain formwork so badly damaged during the flooding process is that in the cavern under cavern pressure upcoming gaseous storage medium suddenly in the flood pipe penetrates or the pipe tour completely is knocked off.

Diese nicht zu beherrschenden Vorgänge können zu kritischen Betriebszuständen führen und erfordern nach einem Havariefall eine kosten- und zeitaufwendige Reparatur der Flutrohrtour.These uncontrollable processes can lead and require critical operating conditions a costly and time-consuming after an accident Repair of the flood pipe tour.

Andererseits ist das Eintauchen des Flutstrangschuhes in einen Flüssigkeitsspiegel (Solespiegel) Voraussetzung für den Einsatz an sich bekannter autarker Sicherheitssysteme auf der Basis von druckabhängig gesteuerten automatischen Schließarmaturen an den Ein- und Ausgängen des Kavernenkopfes für das Gas und die Sole. Mit derartigen Sicherheitssystemen wäre eine Beschädigung oder ein Abriß des Flutstranges auf einfache Weise sofort erkennbar und ein sicherheitstechnischer Überwachungseinsatz mit Arbeitskräften vor Ort könnte auf eine Tagesbefahrung reduziert werden.On the other hand is the immersion of the flood rope shoe into a liquid level (brine level) requirement for the use of self-sufficient, known per se Safety systems based on pressure controlled automatic closing fittings on the Entrances and exits of the cavern head for the gas and the brine. With such security systems would be damage or tearing of the flood line easy to recognize immediately and a safety-related one Monitoring mission with workers on site could be reduced to a day trip become.

Bei nicht auszuschließenden Gebirgsabschalungen ist aber eine Lösungsvariante, die eine bis in den Kavernensumpf eingebaute Flutrohrtour vorsieht, aus den vorgenannten Gründen nicht zu empfehlen.In the case of rock formwork that cannot be ruled out but a solution variant, one down to the cavern swamp built-in flood tube tour provides from the not recommended for the aforementioned reasons.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Fluten einer Kaverne zu entwickeln, die keiner Gefährdung durch Gebirgsabschalungen ausgesetzt sind, den Einsatz druckabhängig gesteuerter Sicherheitsabsperrarmaturen als Voraussetzung einer automatisierten Betriebsführung zum Fluten der Kaverne zulassen, eine ständig hydraulische Sicherung gegenüber dem in der Kaverne unter Druck anstehenden Gas gewährleisten und im Nennstrombereich den Abriß des Flutstromes vermeiden.The invention has for its object a method and a device for flooding a cavern develop that pose no risk from mountain formwork are exposed to pressure-dependent use Controlled safety shut-off valves as a requirement automated operational management for flooding the cavern allow a constantly hydraulic Securing against pressure in the cavern Ensure gas and in the nominal current range avoid tearing off the flood current.

Erfindungsgemäß wird die Aufgabe durch ein Verfahren nach den Merkmalen des Anspruches 1 und durch eine Vorrichtung entsprechend den Merkmalen nach Anspruch 6 gelöst. Weitere vorteilhafte Ausbildungen der Erfindung ergeben sich aus den Unteransprüchen 2 bis 5 und 7 bis 11.According to the invention, the object is achieved by a method according to the features of claim 1 and by a Device according to the features of claim 6 solved. Further advantageous training of the Invention emerge from the subclaims 2 to 5 and 7 to 11.

Gemäß den Merkmalen nach Anspruch 1 bis 5 wird die Kaverne geflutet und hierzu in der Kavernenbohrung eine Flüssigkeitssäule vorzugsweise aus dem Flutmedium eingerichtet, die während des gesamten Flutprozesses aufrechterhalten wird. Mit der von der Flüssigkeitssäule erzeugten Druckwirkung wird während der gesamten Dauer des Flutprozesses eine hydraulische Sicherung gegenüber dem Innendruck der Kaverne vorgenommen. Bei Flutstillstand wird diese Säule zu einer hydrostatischen, den Kaverneninnendruck selbsttätig kompensierenden Flüssigkeitssäule, die die Kaverne hydraulisch verschließt.According to the features of claims 1 to 5, the Flooded cavern and for this purpose in the cavern bore a liquid column preferably from the flood medium set up throughout the flood process is maintained. With that of the liquid column generated pressure effect is during the entire duration of the flooding process a hydraulic Secured against the inside pressure of the cavern. When the flood stops, this pillar becomes one hydrostatic, the cavern internal pressure automatically compensating liquid column that the cavern hydraulically closed.

Zur Durchführung des Verfahrens und zur Errichtung der Flüssigkeitssäule wird eine Vorrichtung nach den Ansprüchen 6 bis 11 eingesetzt, die gegen den Innendruck der Kaverne in einem Bereich des Kavernendaches, der nicht durch Gebirgsabschalungen gefährdet ist, eingebaut wird. Die erfindungsgemäße Vorrichtung umfaßt einen Flutstrang aus einem Außen- und einem Innenrohr, deren Rohrquerschnitte während des Einbaues in die unter einem Innendruck stehende Kaverne gegen Gasdurchschlag gesichert sind. In das Außenrohr, das am Rohrschuh durch einen vorzugsweise ziehbaren Stopfen verschlossen ist und Überströmöffnungen zum äußeren Ringraum zwischen dem Außenrohr und der Verrohrung der Kavernenbohrung aufweist, ist oberhalb der Überströmöffnungen das Innenrohr so eingehängt, daß ein innerer Ringraum entsteht, der von dem Flutmedium in umgekehrter Fließrichtung durchströmt werden kann.To carry out the procedure and to set it up the liquid column becomes a device according to the Claims 6 to 11 used against the internal pressure the cavern in an area of the cavern roof, which is not endangered by mountain formwork is installed. The device according to the invention includes a flood line from an outer and one Inner tube, its tube cross-sections during installation into the cavern, which is under internal pressure are secured against gas breakdown. Into the outer tube, preferably on the pipe shoe pullable stopper is closed and overflow openings to the outer annulus between the outer tube and the piping of the cavern bore is the inner tube above the overflow openings mounted that an inner annulus arises, the of the flood medium in the reverse flow direction can be flowed through.

Die Flüssigkeitssäule, die in einer unteren Sektion des Flutstranges zwischen dem Rohrschuh des Außenrohres und dem Tubingstranghänger des Innenrohres entsteht, bildet einen hydraulischen Verschluß gegenüber dem in der Kaverne anstehenden Innendruck und verhindert so den Gaseintritt in den Flutstrang und über den Flutstrang in den Kavernenkopf.The liquid column in a lower section of the flood line between the tubular shoe of the outer tube and the tubing string hanger of the inner tube, forms a hydraulic lock opposite the internal pressure in the cavern and prevented so the gas entry into the flood line and over the flood line in the cavern head.

In einer oberen Sektion des Flutstranges, zwischen dem Tubingstranghänger und dem Kavernenkopf, ist ein Rohrsegment angeordnet, das zur Einstellung der Strömungswiderstände im gesamten Flutstrang dient. Durch Änderung der Rohrlänge und des Rohrquerschnittes des Rohrsegmentes können die Fließwiderstände im Flutstrang auf die aktuellen Bedingungen vor Ort abgestimmt und eine exakte Einstellung und Regelung der Flüssigkeitssäule im Flutstrang vorgenommen werden. Vorzugsweise ist das Rohrsegment ebenfalls im Tubingstranghänger des Innenrohres eingesetzt und mit Mitteln zum Anschluß weiterer Rohrsegmente ausgestattet.In an upper section of the flood line, between the tubing string hanger and the cavern head is a Pipe segment arranged to adjust the flow resistance serves in the entire flood line. By Change the pipe length and pipe cross section of the Pipe segment, the flow resistance in the flood line tailored to the current conditions on site and an exact setting and regulation of the Liquid column can be made in the flood line. Preferably, the pipe segment is also in the tubing string hanger of the inner tube and with Equipped with means for connecting further pipe segments.

Zur Einstellung höherer Fließwiderstände können auch Drosselelemente eingesetzt werden, die vorzugsweise im Bereich des austauschbaren Rohrsegmentes anzuordnen sind.You can also use it to set higher flow resistances Throttle elements are used, which are preferred to be arranged in the area of the interchangeable pipe segment are.

Bei einer Flutunterbrechnung oder einem Flutabriß stellt sich selbständig eine Flüssigkeitssäule ein, die von den Überströmöffnungen im Außenrohr und dem Spiegelstand des Flutmediums im Flutstrang unterhalb des Kavernenkopfes begrenzt ist. Diese Flüssigkeitssäule kompensiert selbständig den jeweiligen aktuellen Innendruck der Kaverne.In the event of a flood interruption or a tearing down a liquid column sets itself up, that of the overflow openings in the outer tube and the Level of the flood medium in the flood line below of the cavern head is limited. This liquid column automatically compensates for the current one Inside pressure of the cavern.

Gleichzeitig verhindern die Flüssigkeitssäule in den Rohren des Flutstranges zwischen den Überströmöffnungen im Außenrohr und dem Kopf des austauschbaren Rohrsegmentes das Durchschlagen des Flutmediums in die Kaverne bei einer Flutunterbrechung.At the same time prevent the liquid column in the Pipes of the flood line between the overflow openings in the outer tube and the head of the interchangeable tube segment the penetration of the flood medium into the cavern in the event of a flood interruption.

Das zum Fluten der Speicherkaverne einzubringende Flutmedium wird über das Innenrohr des Flutstranges zugeführt, fließt aus dem Fußbereich des Innenrohres in den inneren Ringraum zwischen dem Außen- und dem Innenrohr und steigt anschließend in diesem Ringraum bis in Höhe der Überströmöffnungen des Außenrohres und gelangt von dort über den äußeren Ringraum zwischen dem Außenrohr und der Verrohrung der Kavernenbohrung in die Kaverne. The one to be used to flood the storage cavern Flood medium is through the inner tube of the flood line supplied, flows from the foot area of the inner tube in the inner annulus between the outer and the Inner tube and then rises in this annulus up to the level of the overflow openings of the outer tube and from there it passes through the outer annulus between the outer tube and the piping of the cavern bore into the cavern.

Mit der vorliegenden Erfindung wird eine äußerst funktionssichere Lösung zum Fluten von Kavernen vorgeschlagen, die auch bei einem unerwarteten Flutstopp eine hohe Betriebssicherheit gewährleistet. Mit der vorgeschlagenen Lösung ist das Anfahren des Flutprozesses ohne Einfluß des Kaverneninnendruckes jederzeit möglich. Das vom Flutmedium verdrängte Restgas wird vollständig ausgelagert.With the present invention, one becomes extreme reliable solution for flooding caverns proposed, even with an unexpected flood stop high operational reliability guaranteed. With the The proposed solution is to start the flood process at any time without the influence of the inside cavern pressure possible. The residual gas displaced by the flood medium is completely outsourced.

Die erfindungsgemäße Vorrichtung weist in ihrer Ausführung keine mechanisch bewegten Ausrüstungsteile auf und ist dadurch vollkommen reparaturunanfällig.The device according to the invention has in its Execution no mechanically moving equipment parts and is therefore completely not susceptible to repairs.

Der Flutstrang, mit dem die Flüssigkeitssäule in Abhängigkeit von dem sich während des Flutprozesses ändernden Innendruckes der Kaverne selbsttätig eingerichtet wird, bietet eine absolute Sicherheit gegen Gasrückschlag in den Kavernenkopf und gegen Druckstoß in das gesamte Leitungssystem zum Fluten der Kaverne.The flood line with which the liquid column in Dependency on yourself during the flood process changing internal pressure of the cavern set up automatically offers absolute security against Gas kickback in the cavern head and against pressure surge into the entire pipe system for flooding the cavern.

Strangabschläge durch Gebirgsabschalungen können die gesamte Flutstranganordnungen nicht gefährden, da sich keine Rohrtouren im Kavernenhohlraum befinden.Strand strikes through rock formwork can do not endanger entire flood line arrangements since there are no pipe tours in the cavern cavity.

Außerdem gewährleistet die erfindungsgemäße Lösung eine kontinuierliche Ausspeicherung des in der Kaverne zur Herstellung und Aufrechterhaltung des geomechanisch bedingten Mindestinnendruckes vorhandenen Gasvolumens, wodurch ein weiterer Vorteil erzielbar ist.In addition, the solution according to the invention ensures a continuous storage of the in the cavern to manufacture and maintain the geomechanically conditional minimum internal pressure of existing gas volume, whereby a further advantage can be achieved.

Die Erfindung ermöglicht das Fluten der Kaverne mit einem flüssigen Medium, vorzugsweise mit einer vollgesättigten Sole. The invention enables the cavern to be flooded with a liquid medium, preferably with a fully saturated one Brine.

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. Die dazugehörige Zeichnung zeigt den erfindungsgemäßen Flutstrang zum Fluten einer Speicherkaverne und zur Errichtung einer den Innendruck der Kaverne kompensierenden Flüssigkeitssäule in schematischer Darstellung.The invention is intended to be based on an exemplary embodiment are explained in more detail. The Associated Drawing shows the flood line according to the invention Flood a storage cavern and to build one the inside pressure of the cavern compensating liquid column in a schematic representation.

Zur Realisierung der Aufgabenstellung eines Rekonstruktionsprojektes ist die Kaverne 19 mit der Kavernenbohrung 16 und dem Kavernensumpf 20, die beispielsweise als Speicher für ein gasförmiges Medium diente, vollständig zu fluten. Das gespeicherte gasförmige Medium wurde auf bekannte Weise teilausgelagert. In der Kaverne 19 ist ein geomechanisch notwendiger Innendruck verblieben.To realize the task of a reconstruction project is the cavern 19 with the cavern bore 16 and the cavern sump 20, for example served as a storage for a gaseous medium, to flood completely. The stored gaseous Medium was partially outsourced in a known manner. In the cavern 19 is a geomechanically necessary Internal pressure remained.

Um die Kaverne 19 fluten zu können, ist erfindungsgemäß in die verrohrte Kavernenbohrung 16 ein Flutstrang 13 eingebaut, der aus einem Außenrohr 10, das am Rohrschuh 5 mit einem geeigneten, ziehbaren Stopfen 4 hermetisch dicht verschlossen ist, und aus einem Innenrohr 9 besteht, das mittels Tubingstranghänger 7 oberhalb von Überströmöffnungen 8 dicht im Außenrohr 10 eingesetzt ist.In order to be able to flood the cavern 19, the invention is based a flood line in the cased cavern bore 16 13 installed, which consists of an outer tube 10, the on the tubular shoe 5 with a suitable, pullable plug 4 is hermetically sealed, and off an inner tube 9, which is by means of tubing string hangers 7 above overflow openings 8 close to Outer tube 10 is inserted.

In den Tubingstranghänger 7 ist ein weiteres, in seiner Länge und seinem Rohrquerschnitt variierbares Rohrsegment 15 austauschbar angeordnet, mit dem der Fließwiderstand im Flutstrang 13 zur Einrichtung einer Flüssigkeitssäule in Abhängigkeit von den tatsächlichen Bedingungen vor Ort eingestellt und reguliert werden kann.In the tubing string hanger 7 is another, in its length and its tube cross section variable Pipe segment 15 arranged interchangeably, with which the Flow resistance in the flood line 13 for installation a liquid column depending on the actual conditions set on site and can be regulated.

Vor dem Einbau des Flutstranges 13 in die mit Gas gefüllte und unter dem Innendruck der Kaverne 19 stehende Kavernenbohrung 16 wird das Innenrohr 9 am Rohrschuh 6 mit einem ziehbaren Stopfen 14 temporär verschlossen, um zu verhindern, daß während der Installation gasförmiges Speichermedium am Kavernenkopf 17 austreten kann.Before installing the flood line 13 in the gas-filled and under the internal pressure of the cavern 19 Cavern bore 16 becomes the inner tube 9 on the tubular shoe 6 temporarily with a pullable plug 14 locked to prevent that during the Installation of gaseous storage medium on the cavern head 17 can emerge.

Das Außenrohr 10 des Flutstranges 13 wird in bekannter Weise durch die Stopfbuchse einer zeitweilig am Kavernenkopf 17 montierten Hochdruckschleuse - nicht dargestellt - in üblichen Rohrbaulängen bis in Teufe der Überströmbohrungen 8 in die Kavernenbohrung 16 eingebaut. Danach wird das Innenrohr 9 mit dem Tubingstranghänger 7, der das Innenrohr 9 gegenüber dem Außenrohr 10 abdichtet, in das Außenrohr 10 eingebracht. Anschließend erfolgt der weitere Einbau des Außenrohres 10 mit Hilfe der Hochdruckschleuse bis zur vorgesehenen Teufe des Rohrschuhes 5 innerhalb eines gegen Gebirgsabschalungen ungefährdeten Bereiches des Kavernendaches 1.The outer tube 10 of the flood line 13 is known Way through the stuffing box one at a time Cavern head 17 mounted high pressure lock - not shown - in common pipe lengths up to depth the overflow bores 8 into the cavern bore 16 built-in. Then the inner tube 9 with the tubing string hanger 7, the inner tube 9 compared to the Seals outer tube 10, introduced into the outer tube 10. Then the further installation of the Outer tube 10 with the help of the high pressure lock to the intended depth of the tubular shoe 5 within an area that is safe against mountain formwork of the cavern roof 1.

Nachdem das Außenrohr 10 gasdicht am Kavernenkopf 17 der Kavernenbohrung 16 abgehangen worden ist, wird das in seinen Abmessungen variierbare Rohrsegment 15 in das Außenrohr 10 eingebaut und von oben dicht in den Tubingstranghänger 7 gesteckt und abgestellt. Vorzugsweise ist der Kopf 28 des Rohrsegmentes 15 mit an sich bekannten Mitteln für den Anschluß weiterer Rohrsegmente zur Einstellung und Regulierung der Fließwiderstände für die Einrichtung der Flüssigkeitssäule im Flutstrang 13 ausgestattet. Zu diesem Zweck können auch Drosselelemente 30 vorgesehen werden, die oberhalb des Tubingstranghänger 7 im Rohrsegment 15 anzuordnen sind.After the outer tube 10 is gas-tight on the cavern head 17 the cavern bore 16 has been suspended the tube segment 15 which is variable in its dimensions installed in the outer tube 10 and tight from above the tubing string hanger 7 inserted and parked. The head 28 of the pipe segment 15 is preferably included known means for connecting further Pipe segments for setting and regulating the Flow resistances for the establishment of the liquid column equipped in flood line 13. To this end throttle elements 30 can also be provided above the tubing string hanger 7 in the pipe segment 15 are to be arranged.

Abschließend wird die Hochdruckschleuse demontiert und der Kavernenkopf 17 gasdicht mit der Solepumpleitung 23 und der Gasförderleitung 24 verbunden. Danach wird der temporäre Stopfen 14 mit bekannten Mitteln aus dem Innenrohr 9 ausgebaut. Finally, the high-pressure lock is dismantled and the cavern head 17 gas-tight with the brine pump line 23 and the gas delivery line 24 connected. After that the temporary plug 14 by known means removed from the inner tube 9.

Das am Kavernenkopf 17 über die Solepumpleitung 23 in den oberen Abschnitt 31 des Außenrohres 10 eingepumpte Flutmedium 26 fließt durch den Befüllraum 32 des Innenrohres 9 und gelangt über den Rohrschuh 6 in den inneren Ringraum 12 zwischen dem Innenrohr 9 und dem Außenrohr 10. Innerhalb des Ringraumes 12 steigt das eingepumpte Flutmedium bis zu den Überströmöffnungen 8 des Außenrohres 10 und fließt von dort in den unter dem Innendruck der Kaverne 19 stehenden gasgefüllten äußeren Ringraum 11 zwischen der zementierten Verrohrung 3 der Kavernenbohrung 16 mit dem Rohrschuh 2 und dem Flutstrang 13 nach unten und anschließend in die Kaverne 19.The on the cavern head 17 via the brine pump line 23 in pumped the upper section 31 of the outer tube 10 Flood medium 26 flows through the filling chamber 32 of the Inner tube 9 and passes through the tubular shoe 6 in the inner annular space 12 between the inner tube 9 and the Outer tube 10. This increases within the annular space 12 pumped flood medium up to the overflow openings 8 of the outer tube 10 and flows from there into the the internal pressure of the cavern 19 standing gas-filled outer annular space 11 between the cemented piping 3 of the cavern bore 16 with the tubular shoe 2 and the flood line 13 down and then in the cavern 19.

Im Gegenstrom 25 strömen die auszulagernden Restgasmengen über den äußeren Ringraum 11 zum Kavernenkopf 17 und werden über die mit einem Absperrventil 18 ausgestattete Gasförderleitung 24 einer Trocknungsanlage und anschließend der bestimmungsgemäßen Verwendung zugeführt.The quantities of residual gas to be removed flow in counterflow 25 over the outer annular space 11 to the cavern head 17 and are equipped with a shut-off valve 18 Gas delivery line 24 of a drying plant and then the intended use fed.

Über die Einstellung der Fließwiderstände im Flutstrang 13 wird eine solche Drosselwirkung im Flutstrom des Flutmediums hervorgerufen, daß sich im Nennratenbereich eine geschlossene Flüssigkeitssäule ausbildet, die einen gleichmäßigen pulsfreien Einspeisedruck für das Flutmedium am Kavernenkopf 17 gewährleistet.About the setting of the flow resistance in the flood line 13 becomes such a throttling effect in the flood current of the flood medium caused that in Nominal rate range a closed liquid column that forms an even, pulse-free feed pressure guaranteed for the flood medium at the cavern head 17.

Bei einer Unterbrechung des Flutprozesses fällt die Flüssigkeitsäule, gedämpft durch die Drosselwirkungen des Rohrsegmentes 15 auf eine wirksame Säulenhöhe in einen Bereich 29 zwischen den Durchströmöffnungen 8 und dem Solespiegel 22 im Außenrohr 10, die in ihrer statischen Druckhöhe den aktuellen Innendruck der Kaverne kompensiert und gleichzeitig einen hydraulischen Verschluß der Kaverne 19 bewirkt.If the flooding process is interrupted, the falls Liquid column, dampened by the throttling effects of the pipe segment 15 to an effective column height in a region 29 between the throughflow openings 8 and the brine level 22 in the outer tube 10, which in their static pressure head the current internal pressure of the Cavern compensates and at the same time a hydraulic one Closure of the cavern 19 causes.

Die sich im Ringraum 12 zwischen den Überströmbohrungen 8 und dem Rohrschuh 6 und im Innenrohr 9 ausbildende Flüssigkeitssäule verhindert den Durchtritt des Gases aus der Kaverne 19 bis in den Kavernenkopf 17.Which are in the annular space 12 between the overflow bores 8 and the tubular shoe 6 and in the inner tube 9 Liquid column prevents the passage of the Gases from cavern 19 to cavern head 17.

Nach den allgemein geltenden Sicherheitsnormen sind die Ausrüstungen für Kavernen am Kavernenkopf mit einem automatisch schließenden Sicherheitssystem auszustatten, das bei Erreichen eines die Sicherheit gewährleistenden Grenzwertes abschaltet.According to the generally applicable safety standards the equipment for caverns at the cavern head an automatically closing security system equip that upon reaching security guaranteeing limit switches off.

Mit der Erfindung werden die Voraussetzungen für den Einsatz einfacher Sicherheitseinrichtungen, beispielsweise einem Sicherheitsabsperrventil 21 geschaffen, die ein wirtschaftliches Abschalten der beim Fluten der Kaverne ablaufenden Prozesse über pmax- Grenzwerte gestatten und in sichere, oberhalb der Kavernenfirste befindliche Bereiche einer zu flutenden Kaverne angeordnet werden können. With the invention, the prerequisites for the use of simple safety devices, for example a safety shut-off valve 21, are created, which allow the processes occurring when the cavern is flooded to be economically switched off via p max limit values and are arranged in safe areas of a cavern to be flooded above the top of the cavern can.

BezugszeichenaufstellungList of reference symbols

11
KavernendachCavern roof
22nd
Rohrschuh (zementierte Produktionsrohrtour)Rohrschuh (cemented production pipe tour)
33rd
zementierte Verrohrungcemented piping
44th
StopfenPlug
55
RohrschuhTubular shoe
66
RohrschuhTubular shoe
77
TubinqstranqhänqerTubinqstranq hangers
88th
ÜberströmöffnungenOverflow openings
99
InnenrohrInner tube
1010th
AußenrohrOuter tube
1111
äußerer Ringraumouter annulus
1212th
innerer Ringrauminner annulus
1313
FlutrohrstrangFlood pipe string
1414
StopfenPlug
1515
RohrsegmentPipe segment
1616
KavernenbohrungCavern drilling
1717th
KavernenkopfCavern head
1818th
AbsperrventilShut-off valve
1919th
Kavernecavern
2020th
KavernensumpfCavern swamp
2121
SicherheitsabsperrventilSafety shut-off valve
2222
SolespiegelBrine level
2323
SolepumpleitungBrine pump line
2424th
GasförderleitungGas production line
2525th
Gasgegenstrom Gas countercurrent
2626
FlutmediumFlood medium
2727
InnenrohrlängeInner tube length
2828
Kopf (Rohrsegment)Head (pipe segment)
2929
wirksame hydraulische Säuleeffective hydraulic column
3030th
DrosselelementThrottle element
3131
Abschnittsection
3232
BefüllraumFilling space

Claims (11)

  1. Method for flooding storage caverns, especially gas storage caverns, which are under a minimum geomechanical internal pressure, as characterized by a liquid column of a flooding medium being installed in the cavern bore, the liquid column is maintained during the entire flooding process and the cavern is flooded above this liquid column, whereby the internal cavern pressure is self-regulated with the pressure of the liquid column and the cavern is automatically sealed when the flow of the liquid is cut off.
  2. Process in accordance with claim 1, characterized by, the liquid column being installed through adjustment of the flow resistance in a flood-pipe and the flood-pipe being installed in a section of the cavern unendangered by splitting rock.
  3. Process as in claims 1 and 2, characterized by the liquid column being a hydraulic column of a flood medium and preferably fully-saturated brine will be used as the flood medium.
  4. Process as in claims 1 to 3, characterized by the internal pressure of the cavern being compensated with the pressure of a hydrostatic liquid column.
  5. Process as in claims 1 to 3, characterized by pressure effect of the hydrodynamic liquid column being smaller than the internal pressure of the cavern.
  6. Device for performing the process in claim 1, characterized by the cavern bore (16) has a flood-pipe shaft (13) consisting of an external pipe (10) with overflow openings (8) that is connected at the foot of the pipe (5) and has an internal pipe (9), whereby the internal pipe (9) is sealed in the external pipe(10) with tubing shaft hangers (7) and is attached in such a way that between the internal pipe (9) and the external pipe (10) an inner space (12) is formed with an increasing flow direction for the flood medium (26) entering from the top and in the tubing shaft hangers (7) another segment of exchangeable pipe (15) can be placed.
  7. Device as in claims 6, characterized by the external pipe (10) being sealed by a temporary stopper (4) and the internal pipe (9) is sealed by a temporary stopper (14) during the insertion phase.
  8. Device as in claims 6 and 7, characterized by the foot (5) of the external pipe (10) is attached in the area of the ceiling of the cavern (1) so that the escape of the flooding medium (26) at the overflow openings (8) and the gas flow (25) do not affect one another.
  9. Device in accordance with claims 6 and 7, characterized by the foot (5) of the external pipe (10) being in the cavern bore (16).
  10. Device in accordance with claims 4 to 6, characterized by the length of the inner pipe (27)and the diameter of the inner pipe (9) being determined by internal pressure at the beginning of the flooding process in the cavern (19) and a connection (15) at the head (28) of the pipe segment for the attachment of other pipe segments.
  11. Device in accordance with claims 4 to 6, characterized by choke elements (30) in the pipe segment (15) above the tubing shaft hanger (7) for further adjusting and regulation of the flow resistance in the flood pipe (13).
EP19970250323 1996-11-11 1997-10-30 Method and device for flooding of gas storage caverns Expired - Lifetime EP0841266B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19647706 1996-11-11
DE1996147706 DE19647706C1 (en) 1996-11-11 1996-11-11 Method and device for flooding storage caverns

Publications (3)

Publication Number Publication Date
EP0841266A2 EP0841266A2 (en) 1998-05-13
EP0841266A3 EP0841266A3 (en) 1998-12-09
EP0841266B1 true EP0841266B1 (en) 2001-02-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970250323 Expired - Lifetime EP0841266B1 (en) 1996-11-11 1997-10-30 Method and device for flooding of gas storage caverns

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Country Link
EP (1) EP0841266B1 (en)
DE (1) DE19647706C1 (en)
DK (1) DK0841266T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046268B4 (en) * 2007-09-20 2010-07-08 Vng-Verbundnetz Gas Ag Method and device for filling and emptying caverns
CN112824653A (en) * 2019-11-21 2021-05-21 中国石油天然气股份有限公司 Salt cavern gas storage cavity-making tool
CN114635671B (en) * 2022-03-28 2023-05-02 中国石油大学(北京) System and method for backfilling oil-based rock debris into salt cavern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB738917A (en) * 1952-08-23 1955-10-19 Taxaco Dev Corp Improvements in or relating to storage of fluids
US3491540A (en) * 1968-05-21 1970-01-27 Atomic Energy Commission Method of storing liquids underground
FR2586234B1 (en) * 1985-08-13 1987-11-20 Geostock Sarl SECURITY DEVICE FOR UNDERGROUND PRESSURE LIQUEFIED GAS STORAGE FILL TUBE

Also Published As

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DE19647706C1 (en) 1998-04-30
EP0841266A2 (en) 1998-05-13
DK0841266T3 (en) 2001-06-18
EP0841266A3 (en) 1998-12-09

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