EP0442408A2 - Device for sealing a steam injection pipe in an oil layer - Google Patents

Device for sealing a steam injection pipe in an oil layer Download PDF

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Publication number
EP0442408A2
EP0442408A2 EP91101858A EP91101858A EP0442408A2 EP 0442408 A2 EP0442408 A2 EP 0442408A2 EP 91101858 A EP91101858 A EP 91101858A EP 91101858 A EP91101858 A EP 91101858A EP 0442408 A2 EP0442408 A2 EP 0442408A2
Authority
EP
European Patent Office
Prior art keywords
steam
borehole
steam generator
support surface
supporting surface
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.)
Withdrawn
Application number
EP91101858A
Other languages
German (de)
French (fr)
Other versions
EP0442408A3 (en
Inventor
Ireneusz Dr. Pyc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP0442408A2 publication Critical patent/EP0442408A2/en
Publication of EP0442408A3 publication Critical patent/EP0442408A3/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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

Definitions

  • the invention relates to a sealing system for sealing a steam line, which is inserted in a borehole up to an oil deposit and is used to introduce steam into an oil layer.
  • the steam line is connected to a steam generator, which is arranged in the same borehole, and opens freely into the petroleum layer with an open outlet. The steam therefore flows freely from the steam line into the petroleum layer.
  • the object of the invention is to provide a sealing system for the steam line, in which the steam line in without effort on the bottom of the borehole the petroleum layer can be brought in and sealed gas-tight with respect to the borehole area.
  • the drawing shows the bottom area of a borehole that leads to an oil deposit.
  • a steam line 2 opens into an oil layer 1 for introducing steam into the oil layer in order to reduce the viscosity of the oil and the crude oil by heating to make it pumpable.
  • the steam line is connected to the steam generator 3 of the steam generating system, the steam to be introduced is under pressure.
  • the steam generator 3 is arranged in the borehole at a distance from the cased borehole wall 4 and sits with its steam generator bottom 5 on a support surface 6 of a tube sheet 7 of the cased borehole. Steam generator base 5 and support surface 6 are conical, the cone angles of both conical parts correspond.
  • the tube sheet 7 is welded to the borehole wall 4 and has a guide piece 9 for the steam line 2. Within the guide piece 9, the steam line 2 opens open above the oil layer 1 and allows the steam generated in the steam generator to escape freely for heating the oil layer.
  • the steam generator and steam line are centered in the borehole due to the conical shape of the steam generator base and the support surface of the tube sheet. Additional bracing to seal the steam line is not required.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Earth Drilling (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Sealing Devices (AREA)

Abstract

A sealing system is specified for a steam pipe which is run in a borehole down to an oil deposit. The steam pipe (2) serves to inject steam into the oil layer (1) and, starting from a steam generator (3), runs in an encased borehole down to the oil deposit. So that the steam pipe can be closed gas-tight at the bottom of the borehole relative to the borehole space, the tube base (7) has a conically formed supporting surface (6), through the open cone point of which the steam pipe leads into the oil layer. The steam pipe (2) is supported on the supporting surface (6). To this end, the steam pipe is passed through a steam-generator base (5) which is formed in accordance with the conical supporting surface (6). Inserted between steam-generator base and supporting surface is a seal (8) which is pressed by the weight of the steam generator (3) against the conical supporting surface (6). …<IMAGE>…

Description

Die Erfindung bezieht sich auf ein Abdichtsystem zum Abdichten einer Dampfleitung, die in einem Bohrloch bis zu einer Erdöllagerstätte hin eingeführt ist und zum Einführen von Dampf in eine Erdölschicht dient. Die Dampfleitung ist an einem Dampferzeuger angeschlossen, der im gleichen Bohrloch angeordnet ist, und mündet mit offenem Ausgang frei in die Erdölschicht. Der Dampf strömt somit ungehindert aus der Dampfleitung in die Erdölschicht ein.The invention relates to a sealing system for sealing a steam line, which is inserted in a borehole up to an oil deposit and is used to introduce steam into an oil layer. The steam line is connected to a steam generator, which is arranged in the same borehole, and opens freely into the petroleum layer with an open outlet. The steam therefore flows freely from the steam line into the petroleum layer.

Aus DE-A-36 12 946 ist eine Anlage zur Erzeugung von Dampf bekannt, die in Erdöllagerstätten zur tertiären Erdölgewinnung eingesetzt wird. Durch Temperaturerhöhung in der Erdölschicht wird die Viskosität des Erdöls herabgesetzt und das Rohöl fließ- und pumpfähig gemacht. Problematisch ist das Abdichten der Dampfleitung zur Einleitung des unter Druck stehenden Dampfes in die Erdölschicht. Die unverschlossene Mündung der Dampfleitung ist gegenüber dem nach oben offenen Bohrlochraum in der Erdöllagerstätte abzudichten.From DE-A-36 12 946 a plant for the production of steam is known, which is used in petroleum deposits for tertiary oil production. By increasing the temperature in the petroleum layer, the viscosity of the petroleum is reduced and the crude oil is made flowable and pumpable. Sealing the steam line to introduce the pressurized steam into the petroleum layer is problematic. The unclosed mouth of the steam line must be sealed off from the upwardly open borehole area in the petroleum deposit.

Aufgabe der Erfindung ist es, ein Abdichtsystem für die Dampfleitung zu schaffen, bei dem die Dampfleitung ohne Aufwand auf der Sohle des Bohrlochs in die Erdölschicht eingebracht und gegenüber dem Bohrlochraum gasdicht verschlossen werden kann.The object of the invention is to provide a sealing system for the steam line, in which the steam line in without effort on the bottom of the borehole the petroleum layer can be brought in and sealed gas-tight with respect to the borehole area.

Diese Aufgabe wird bei einem Abdichtsystem der eingangs genannten Art gemäß der Erfindung durch die im Patentanspruch genannten Merkmale gelöst. Danach wird das verrohrte Bohrloch mit einem Rohrboden ausgerüstet, der eine konische Stützfläche aufweist, durch deren Kegelspitze hindurch die Dampfleitung in die Erdölschicht mündet. Zum Anschluß am Dampferzeuger ist die Dampfleitung durch einen ebenfalls konischen, der Form der Stützfläche des Rohrbodens entsprechenden Dampferzeugerboden hindurchgeführt, wobei zwischen Dampferzeugerboden und konischer Stützfläche eine Dichtung eingelegt ist, die vom Gewicht des Dampferzeugers vom Dampferzeugerboden gegen die Stützfläche gepreßt wird. Das Abdichten der Dampfleitung gegenüber dem Innenraum des Bohrlochs erfolgt somit selbsttätig schon bei Montage der Dampferzeugungsanlage im Bohrloch. Durch die konische Form der Stützfläche des Rohrbodens und des Dampferzeugerbodens wird der Dampferzeuger beim Absenken innerhalb des Bohrloches zugleich zentriert. Zum Abdichten der Dampfleitung ist kein zusätzliches Verspannen zwischen Dampfleitung und Verrohrung des Bohrlochs erforderlich.This object is achieved in a sealing system of the type mentioned according to the invention by the features mentioned in the patent claim. The cased borehole is then equipped with a tube sheet, which has a conical support surface, through the cone tip of which the steam line opens into the petroleum layer. For connection to the steam generator, the steam line is passed through a likewise conical steam generator base, which corresponds to the shape of the support surface of the tube plate, a seal being inserted between the steam generator base and the conical support surface, which is pressed against the support surface by the weight of the steam generator from the steam generator base. The sealing of the steam line with respect to the interior of the borehole thus takes place automatically when the steam generating system is installed in the borehole. Due to the conical shape of the support surface of the tube plate and the steam generator base, the steam generator is simultaneously centered within the borehole when it is lowered. No additional bracing between the steam line and the casing of the borehole is required to seal the steam line.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert, das in der Zeichnung schematisch wiedergegeben ist.The invention is explained in more detail below using an exemplary embodiment which is shown schematically in the drawing.

Die Zeichnung zeigt den Bodenbereich eines Bohrlochs, das zu einer Erdöllagerstätte führt. In eine Erdölschicht 1 mündet eine Dampfleitung 2 zum Einleiten von Dampf in die Erdölschicht, um durch Aufheizen die Viskosität des Erdöls zu verringern und das Rohöl pumpfähig zu machen. Die Dampfleitung ist am Dampferzeuger 3 der Dampferzeugungsanlage angeschlossen, der einzuleitende Dampf steht unter Druck. Der Dampferzeuger 3 ist im Bohrloch mit Abstand zur verrohrten Bohrlochwand 4 angeordnet und sitzt mit seinem Dampferzeugerboden 5 auf einer Stützfläche 6 eines Rohrbodens 7 des verrohrten Bohrlochs auf. Dampferzeugerboden 5 und Stützfläche 6 sind konisch ausgeführt, die Kegelwinkel beider konischen Teile entsprechen sich. Zwischen Dampferzeugerboden 5 und Stützfläche 6 des Rohrbodens ist eine Dichtung 8 eingelegt, die nach Montage der Dampferzeugungsanlage im Bohrloch vom Gewicht des Dampferzeugers zwischen Dampferzeugerboden und Rohrboden zusammengepreßt wird. Der Kegelwinkel für Dampferzeugerboden 5 und Stützfläche 6 ist in Abhängigkeit vom Material der Dichtung derart bemessen, daß das Dampferzeugergewicht zur Abdichtung gegen den Dampfdruck, der durch Einleiten des Dampfes in die Erdölschicht erzeugt wird, ausreichend ist. Im Ausführungsbeispiel ist der Rohrboden 7 an der Bohrlochwand 4 verschweißt und weist ein Führungsstück 9 für die Dampfleitung 2 auf. Innerhalb des Führungsstückes 9 mündet die Dampfleitung 2 offen oberhalb der Erdölschicht 1 und läßt den im Dampferzeuger erzeugten Dampf zur Ewärmung der Erdölschicht frei austreten.The drawing shows the bottom area of a borehole that leads to an oil deposit. A steam line 2 opens into an oil layer 1 for introducing steam into the oil layer in order to reduce the viscosity of the oil and the crude oil by heating to make it pumpable. The steam line is connected to the steam generator 3 of the steam generating system, the steam to be introduced is under pressure. The steam generator 3 is arranged in the borehole at a distance from the cased borehole wall 4 and sits with its steam generator bottom 5 on a support surface 6 of a tube sheet 7 of the cased borehole. Steam generator base 5 and support surface 6 are conical, the cone angles of both conical parts correspond. Between the steam generator base 5 and the support surface 6 of the tube sheet, a seal 8 is inserted, which is compressed by the weight of the steam generator between the steam generator base and the tube sheet after the steam generator is installed in the borehole. The cone angle for the steam generator base 5 and support surface 6 is dimensioned in dependence on the material of the seal in such a way that the steam generator weight is sufficient for sealing against the steam pressure which is generated by introducing the steam into the petroleum layer. In the exemplary embodiment, the tube sheet 7 is welded to the borehole wall 4 and has a guide piece 9 for the steam line 2. Within the guide piece 9, the steam line 2 opens open above the oil layer 1 and allows the steam generated in the steam generator to escape freely for heating the oil layer.

Um den Druck auf die Dichtung zu vergrößern, ist es möglich, in den Zwischenraum zwischen Bohrlochwand 4 und Außenwand des Dampferzeugers 3 Flüssigkeit einzuleiten. Durch geeignete Gestaltung der Dichtung und deren Anordnung zwischen Dampferzeugerboden 5 und Stützfläche 6 läßt sich die Dichtwirkung ebenfalls steigern.In order to increase the pressure on the seal, it is possible to introduce liquid into the space between the borehole wall 4 and the outer wall of the steam generator 3. The sealing effect can also be increased by suitable design of the seal and its arrangement between the steam generator base 5 and the support surface 6.

Bei der Montage der Dampferzeugungsanlage im Bohrloch zentrieren sich Dampferzeuger und Dampfleitung im Bohrloch infolge der konischen Form von Dampferzeugerboden und Stützfläche des Rohrbodens. Eine zusätzliche Verspannung zum Abdichten der Dampfleitung ist nicht erforderlich.When the steam generator is installed in the borehole, the steam generator and steam line are centered in the borehole due to the conical shape of the steam generator base and the support surface of the tube sheet. Additional bracing to seal the steam line is not required.

Claims (1)

Abdichtsystem zum Abdichten einer Dampfleitung, die in einem verrohrten Bohrloch von einem Dampferzeuger ausgehend bis zu einer Erdöllagerstätte verläuft und zum Einführen von Dampf frei in eine Erdölschicht mündet,
dadurch gekennzeichnet,
daß das verrohrte Bohrloch einen Rohrboden (7) mit einer konisch geformten Stützfläche (6) aufweist, durch deren offene Kegelspitze die Dampfleitung (2) in die Erdölschicht mündet, daß die Dampfleitung (2) durch einen Dampferzeugerboden (5) hindurchgeführt ist, der der konischen Stützfläche (6) des Rohrbodens (7) entsprechend geformt ist, und daß zwischen Dampferzeugerboden (5) und Stützfläche (6) des Rohrbodens (7) eine Dichtung (8) eingelegt ist, die vom Gewicht des Dampferzeugers (3) gegen die konische Stützfläche (6) gepreßt wird.Sealing system for sealing a steam line that runs from a steam generator to a petroleum deposit in a cased borehole and opens freely into an oil layer for the introduction of steam,
characterized,
that the cased borehole has a tube sheet (7) with a conically shaped support surface (6), through the open cone tip of which the steam line (2) opens into the petroleum layer, that the steam line (2) is passed through a steam generator bottom (5), which the conical support surface (6) of the tube sheet (7) is shaped accordingly, and that between the steam generator base (5) and the support surface (6) of the tube sheet (7) a seal (8) is inserted, the weight of the steam generator (3) against the conical Support surface (6) is pressed.
EP19910101858 1990-02-12 1991-02-11 Device for sealing a steam injection pipe in an oil layer Withdrawn EP0442408A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4004240 1990-02-12
DE4004240A DE4004240C1 (en) 1990-02-12 1990-02-12

Publications (2)

Publication Number Publication Date
EP0442408A2 true EP0442408A2 (en) 1991-08-21
EP0442408A3 EP0442408A3 (en) 1991-12-18

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ID=6399956

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Application Number Title Priority Date Filing Date
EP19910101858 Withdrawn EP0442408A3 (en) 1990-02-12 1991-02-11 Device for sealing a steam injection pipe in an oil layer

Country Status (5)

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US (1) US5095974A (en)
EP (1) EP0442408A3 (en)
CN (1) CN1053940A (en)
CA (1) CA2036077A1 (en)
DE (1) DE4004240C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8079417B2 (en) * 2008-08-13 2011-12-20 Conocophillips Company Wireline retrievable dsg/downhole pump system for cyclic steam and continuous steam flooding operations in petroleum reservoirs
CA2850741A1 (en) * 2011-10-07 2013-04-11 Manuel Alberto GONZALEZ Thermal expansion accommodation for circulated fluid systems used to heat subsurface formations

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497000A (en) * 1968-08-19 1970-02-24 Pan American Petroleum Corp Bottom hole catalytic heater
US4136737A (en) * 1976-03-22 1979-01-30 Texaco Inc. Method for automatically initiating in situ combustion for enhanced thermal recovery of hydrocarbons from a well
US4385663A (en) * 1981-08-03 1983-05-31 Chevron Research Company Packerless well completion assembly
GB2112838A (en) * 1982-01-08 1983-07-27 Elf Aquitaine A sealing system for a well bore in which a hot fluid is circulated

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142336A (en) * 1960-07-18 1964-07-28 Shell Oil Co Method and apparatus for injecting steam into subsurface formations
US4250963A (en) * 1979-04-05 1981-02-17 Chevron Research Company Selective permeability reduction with polymerizable monomers around steam injection wells
US4366860A (en) * 1981-06-03 1983-01-04 The United States Of America As Represented By The United States Department Of Energy Downhole steam injector
US4399865A (en) * 1981-07-20 1983-08-23 Chevron Research Company Concentric steaming string downhole apparatus
US4463803A (en) * 1982-02-17 1984-08-07 Trans Texas Energy, Inc. Downhole vapor generator and method of operation
DE3612946A1 (en) * 1986-04-17 1987-10-22 Kernforschungsanlage Juelich METHOD AND DEVICE FOR PETROLEUM PRODUCTION

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497000A (en) * 1968-08-19 1970-02-24 Pan American Petroleum Corp Bottom hole catalytic heater
US4136737A (en) * 1976-03-22 1979-01-30 Texaco Inc. Method for automatically initiating in situ combustion for enhanced thermal recovery of hydrocarbons from a well
US4385663A (en) * 1981-08-03 1983-05-31 Chevron Research Company Packerless well completion assembly
GB2112838A (en) * 1982-01-08 1983-07-27 Elf Aquitaine A sealing system for a well bore in which a hot fluid is circulated

Also Published As

Publication number Publication date
CA2036077A1 (en) 1991-08-13
EP0442408A3 (en) 1991-12-18
CN1053940A (en) 1991-08-21
DE4004240C1 (en) 1990-11-29
US5095974A (en) 1992-03-17

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