EP0331295A1 - Assemblage de pipelines pour séparer au moins un courant diphasique - Google Patents

Assemblage de pipelines pour séparer au moins un courant diphasique Download PDF

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Publication number
EP0331295A1
EP0331295A1 EP89301091A EP89301091A EP0331295A1 EP 0331295 A1 EP0331295 A1 EP 0331295A1 EP 89301091 A EP89301091 A EP 89301091A EP 89301091 A EP89301091 A EP 89301091A EP 0331295 A1 EP0331295 A1 EP 0331295A1
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EP
European Patent Office
Prior art keywords
pipeline
riser
gas
junction
oil
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.)
Granted
Application number
EP89301091A
Other languages
German (de)
English (en)
Other versions
EP0331295B1 (fr
Inventor
Oyvind Kaasa
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.)
Norsk Hydro ASA
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Norsk Hydro ASA
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Filing date
Publication date
Application filed by Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP0331295A1 publication Critical patent/EP0331295A1/fr
Application granted granted Critical
Publication of EP0331295B1 publication Critical patent/EP0331295B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
    • 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/36—Underwater separating arrangements
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/09—Detecting, eliminating, preventing liquid slugs in production pipes

Definitions

  • the present invention relates to a system for the separation underwater of the phases of a two-phase fluid flow into respective risers, e.g. as with an offshore platform, where oil and gas are transported by a pipeline along the seabed and by risers to the platform.
  • a two-phase flow in a horizontal pipeline system gives various flow patterns depending on the pipe diameter, geometry temperature and type of oil. Generally said, the flow pattern can be divided into the following categories: stratified, bubble, slug and annular flow.
  • a two-phase flow in a vertical pipe can also be divided into various flow patterns.
  • the slug flow will give the greatest problems as mentioned above.
  • the extreme slugging depends on the geometry and occurs only in the riser when the oil and gas velocity is so low that the horizontal flow is stratified.
  • Normal slugging is hydrodynamic and can be formed both in the horizontal and the vertical pipe section.
  • a separator for separation of the liquid- and gaseous phase has previously been developed.
  • the gas and oil are separated by feeding the flow from one common pipe into two or more parallel pipes.
  • Such separators require large space and are expensive to build.
  • a common feature of the aforementioned three types of slug catchers is that all three make use of some type of phase separator on the platform. Since the total capacity of the slug catchers has to be larger than the largest expected slugs it will occupy expensive and limited space on the platform.
  • a system for the separation underwater into phases of a fluid flow having at least two phases comprises an underwater pipeline, a main riser connected to the pipeline and a secondary riser connected to the pipeline upstream of the main riser via a T-junction wherein the secondary riser ascends to a separation plant and includes flow restriction means, characterised in that the T-junction is positioned along the pipeline a prescribed distance from the main riser, the flow restriction means is a controlled regulating valve, and there is controlling means responsive to the position of the liquid/gas interface along the pipeline for controlling the setting of the regulating valve so as to maintain the position of the said interface constant.
  • the system is especially designed to deal with extreme slugs which occur normally at low liquid and gas velocity, i.e. at startup and shut-down of the production.
  • the main advantage of the system, which is designed to be located on the seabed, is that it has no moving parts, is simple and easy to manufacture, and is reliable and simple to maintain.
  • Figure 1 illustrates an offshore platform 10 for transporta­tion and processing of oil and gas from a remote subsea instal­lation or well via a riser 2 to the processing plant on the platform 10.
  • the pipeline 1 is connected to a separate secondary riser 3 via a T-junction 5 located at a distance X from the riser 2.
  • the secondary riser is connected to a gas scrubber 6 located on the platform.
  • a storage tank 4 is provided with a drainpipe 12 for the oil and one discharge pipe 13 for any gas that has evaporated from or was mixed with the oil.
  • a detection means 8 is provided to determine the location along the pipe 1 of any oil/gas interface. As shown, this detector comprises five capacitive detectors K1-K5 arranged in the pipeline section between the T-junction 5 and the riser 2. The capacitive detectors K1-K5 detect the presence of an oil/gas interface in the pipeline. The capacitive detectors are connected to a level indicator and give electrical signals to a control unit (not shown) which controls a regulating valve 7 located on the secondary riser 3.
  • the oil and gas transported in the main pipeline 1 are separated at the T-junction 5, where the gas components of the two-phase flow pass into the secondary riser 3 and the oil components pass into the pipeline 1 downstream of the T-junction and into the riser 2.
  • the pipeline 1 between the T-junction and the riser 2 should be slightly sloped so that a liquid seal is formed in the riser.
  • the regulating valve 7, by venting the gas, regulates the pressure in the pipeline 1 and in the riser 2. The regulation is done according to the signals from the capacitive detectors K1-K5 in the pipeline.
  • the regu­lating valve 7 will open at increasing gas pressure in the secondary riser when the liquid/gas interface reaches the detector K1.
  • the riser 2 will therefore contain fluid which is 100% oil and the oil/gas interface at all times will be located between the T-junction and the riser 2.
  • the accuracy of the oil/gas interface detection is of course dependent on the number of detectors situated in the pipeline and the distance between them.
  • the detection means may comprise more or less than five capacitive detectors or equivalent detectors of another type capable of detecting the presence of the liquid/gas interface.
  • Such detectors might comprise pressure sensors located in the scrubber, the storing tank and the pipeline. By means of the difference and the variation of pressure the position of the liquid/gas interface in the pipeline can be determined.
  • the pipes may have different diameters and lengths. To determine the optimum length of the pipes it is important to make sure that the system can deal with the peak values of slugs. Tests have shown that a distance X between the T-junction 5 and the riser 2 should be at least two times the height of the riser.
  • the pipes can be of different diameters, it is regarded as being an advantage to be able to clean the inside of the pipes by using a "pig".
  • the pipeline 1 and the risers 2, 3 should therefore have the same diameter and be as free as possible of obstacles such as valves, bends, etc.
  • the angle of inclination of the pipeline between the tee section and the riser is also important. Tests have indicated that it should be approximately 2° to the horizontal. To achieve the best separation of the two-phase flow the angle between the upright of the T-junction 5 and the main pipeline 1 may be an angle other than 90°, as illustrated in the drawings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipeline Systems (AREA)
  • Earth Drilling (AREA)
  • Paper (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
EP89301091A 1988-02-03 1989-02-03 Assemblage de pipelines pour séparer au moins un courant diphasique Expired EP0331295B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO880465 1988-02-03
NO880465A NO163424C (no) 1988-02-03 1988-02-03 Integrert system for omforming av stroemningsmoenster.

Publications (2)

Publication Number Publication Date
EP0331295A1 true EP0331295A1 (fr) 1989-09-06
EP0331295B1 EP0331295B1 (fr) 1992-12-09

Family

ID=19890632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89301091A Expired EP0331295B1 (fr) 1988-02-03 1989-02-03 Assemblage de pipelines pour séparer au moins un courant diphasique

Country Status (5)

Country Link
EP (1) EP0331295B1 (fr)
BR (1) BR8900411A (fr)
DE (1) DE68903771T2 (fr)
ES (1) ES2036339T3 (fr)
NO (1) NO163424C (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0410522A2 (fr) * 1989-07-25 1991-01-30 Shell Internationale Researchmaatschappij B.V. Méthode et dispositif pour prévenir la croissance des dépôts dans une tuyauterie
US5478504A (en) * 1993-09-27 1995-12-26 Petroleo Brasileiro S.A. - Petrobras Method and apparatus for eliminating severe slug in multi-phase flow subsea lines
WO1997047857A1 (fr) * 1996-06-12 1997-12-18 Petróleo Brasileiro S.A. - Petrobras Equipement et procede de production petroliere en mer par injection intermittente de gaz
GB2358205A (en) * 2000-01-17 2001-07-18 Bg Intellectual Pty Ltd Method and apparatus for eliminating severe slugging in a riser of a pipeline includes measuring pipeline pressure and operating a valve
WO2001053649A2 (fr) * 2000-01-17 2001-07-26 Lattice Intellectual Property Ltd Prevention de la formation de bouchons
WO2003067146A1 (fr) * 2002-02-04 2003-08-14 Statoil Asa Canalisation multiphase sous-marine
WO2004016907A1 (fr) * 2002-08-16 2004-02-26 Norsk Hydro Asa Separateur de conduit pour la separation de fluides, notamment de petrole, de gaz et d'eau
FR2875260A1 (fr) * 2004-09-13 2006-03-17 Inst Francais Du Petrole Systeme pour neutraliser la formation de bouchon de liquide dans une colonne montante
WO2007060228A1 (fr) * 2005-11-28 2007-05-31 Shell Internationale Research Maatschappij B.V. Procede de reception de fluide a partir d'un pipeline de gaz naturel
WO2009133028A1 (fr) * 2008-04-28 2009-11-05 Shell Internationale Research Maatschappij B.V. Procédé de production de composants gazeux et liquides à partir d’un ou plusieurs flux multi-phases et appareil de ce procédé
WO2009133027A1 (fr) * 2008-04-28 2009-11-05 Shell Internationale Research Maatschappij B.V. Procédé de dérivation d’un pipeline dans un système à multiples pipelines
WO2011057783A1 (fr) 2009-11-16 2011-05-19 Eni S.P.A. Procédé de séparation d'un courant multiphase qui s'écoule le long d'un tuyau au moyen d'une jonction en t

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401379A1 (fr) * 1977-08-26 1979-03-23 Texas Eastern Eng Ltd Procede et appareil de manipulation de fluides circulant en deux phases dans des pipe-lines
WO1987001759A1 (fr) * 1985-09-18 1987-03-26 Stiftelsen For Industriell Og Teknisk Forskning Ve Collecteur de bouchon pouvant etre nettoye
US4708793A (en) * 1986-06-13 1987-11-24 Atlantic Richfield Company System for separating gas-liquid flowstreams

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401379A1 (fr) * 1977-08-26 1979-03-23 Texas Eastern Eng Ltd Procede et appareil de manipulation de fluides circulant en deux phases dans des pipe-lines
WO1987001759A1 (fr) * 1985-09-18 1987-03-26 Stiftelsen For Industriell Og Teknisk Forskning Ve Collecteur de bouchon pouvant etre nettoye
US4708793A (en) * 1986-06-13 1987-11-24 Atlantic Richfield Company System for separating gas-liquid flowstreams

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OIL & GAS JOURNAL, vol. 77, no. 46, November 1979, pages 230-238, Pennwell Publishing Co., Tulsa, Oklahoma, US; Z. SCHMIDT et al.: "Choking can eliminate severe pipeline slugging" *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0410522A2 (fr) * 1989-07-25 1991-01-30 Shell Internationale Researchmaatschappij B.V. Méthode et dispositif pour prévenir la croissance des dépôts dans une tuyauterie
EP0410522A3 (en) * 1989-07-25 1991-12-11 Shell Internationale Research Maatschappij B.V. Method and apparatus for preventing slug growth in a pipeline
AU631445B2 (en) * 1989-07-25 1992-11-26 Shell Internationale Research Maatschappij B.V. Method and apparatus for preventing slug growth in a pipeline
US5478504A (en) * 1993-09-27 1995-12-26 Petroleo Brasileiro S.A. - Petrobras Method and apparatus for eliminating severe slug in multi-phase flow subsea lines
WO1997047857A1 (fr) * 1996-06-12 1997-12-18 Petróleo Brasileiro S.A. - Petrobras Equipement et procede de production petroliere en mer par injection intermittente de gaz
GB2329206A (en) * 1996-06-12 1999-03-17 Petroleo Brasileiro Sa Method and equipment for offshore oil production by intermittent gas injection
GB2329206B (en) * 1996-06-12 2000-07-12 Petroleo Brasileiro Sa Method and equipment for offshore oil production by intermittent gas injection
US6129150A (en) * 1996-06-12 2000-10-10 Petroleo Brasileiro S.A. - Petrobras Method and equipment for offshore oil production by intermittent gas injection
US6716268B2 (en) 2000-01-17 2004-04-06 Lattice Intellectual Property Ltd. Slugging control
GB2358205A (en) * 2000-01-17 2001-07-18 Bg Intellectual Pty Ltd Method and apparatus for eliminating severe slugging in a riser of a pipeline includes measuring pipeline pressure and operating a valve
WO2001053649A3 (fr) * 2000-01-17 2002-04-04 Lattice Intellectual Property Prevention de la formation de bouchons
GB2358205B (en) * 2000-01-17 2003-12-31 Bg Intellectual Pty Ltd Slugging control
WO2001053649A2 (fr) * 2000-01-17 2001-07-26 Lattice Intellectual Property Ltd Prevention de la formation de bouchons
WO2003067146A1 (fr) * 2002-02-04 2003-08-14 Statoil Asa Canalisation multiphase sous-marine
US7516794B2 (en) 2002-08-16 2009-04-14 Norsk Hydro Asa Pipe separator for the separation of fluids, particularly oil, gas and water
WO2004016907A1 (fr) * 2002-08-16 2004-02-26 Norsk Hydro Asa Separateur de conduit pour la separation de fluides, notamment de petrole, de gaz et d'eau
CN100346055C (zh) * 2002-08-16 2007-10-31 诺尔斯海德公司 分离流体的管式分离装置
FR2875260A1 (fr) * 2004-09-13 2006-03-17 Inst Francais Du Petrole Systeme pour neutraliser la formation de bouchon de liquide dans une colonne montante
US7464762B2 (en) 2004-09-13 2008-12-16 Institut Francais Du Petrole System for neutralizing the formation of slugs in a riser
US7947121B2 (en) 2005-11-28 2011-05-24 Shell Oil Company Method for receiving fluid from a natural gas pipeline
EA012742B1 (ru) * 2005-11-28 2009-12-30 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Способ выделения текучей среды из трубопровода природного газа
WO2007060228A1 (fr) * 2005-11-28 2007-05-31 Shell Internationale Research Maatschappij B.V. Procede de reception de fluide a partir d'un pipeline de gaz naturel
WO2009133028A1 (fr) * 2008-04-28 2009-11-05 Shell Internationale Research Maatschappij B.V. Procédé de production de composants gazeux et liquides à partir d’un ou plusieurs flux multi-phases et appareil de ce procédé
WO2009133027A1 (fr) * 2008-04-28 2009-11-05 Shell Internationale Research Maatschappij B.V. Procédé de dérivation d’un pipeline dans un système à multiples pipelines
AU2009242195B2 (en) * 2008-04-28 2012-07-26 Shell Internationale Research Maatschappij B.V. Method of producing gaseous and liquid components from one or more multi-phase streams and an apparatus therefor
EA018019B1 (ru) * 2008-04-28 2013-04-30 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Способ получения газообразных и жидких компонентов из одного или нескольких многофазных потоков и устройство для его осуществления
US8480788B2 (en) 2008-04-28 2013-07-09 Shell Oil Company Method of bypassing a pipeline in a multiple pipeline system
EA018842B1 (ru) * 2008-04-28 2013-11-29 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Способ байпасирования трубопровода в системе множества трубопроводов
US8726982B2 (en) 2008-04-28 2014-05-20 Shell Oil Company Method of producing gaseous and liquid components from one or more multi-phase streams and apparatus therefor
WO2011057783A1 (fr) 2009-11-16 2011-05-19 Eni S.P.A. Procédé de séparation d'un courant multiphase qui s'écoule le long d'un tuyau au moyen d'une jonction en t

Also Published As

Publication number Publication date
ES2036339T3 (es) 1993-05-16
EP0331295B1 (fr) 1992-12-09
DE68903771D1 (de) 1993-01-21
DE68903771T2 (de) 1993-05-13
NO880465L (no) 1989-08-04
NO880465D0 (no) 1988-02-03
NO163424B (no) 1990-02-12
NO163424C (no) 1991-11-28
BR8900411A (pt) 1989-09-26

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