WO2008004883A1 - Method of processing and separating a multiphase well effluent mixture - Google Patents

Method of processing and separating a multiphase well effluent mixture Download PDF

Info

Publication number
WO2008004883A1
WO2008004883A1 PCT/NO2007/000249 NO2007000249W WO2008004883A1 WO 2008004883 A1 WO2008004883 A1 WO 2008004883A1 NO 2007000249 W NO2007000249 W NO 2007000249W WO 2008004883 A1 WO2008004883 A1 WO 2008004883A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
liquid
recycled
well effluent
multiphase well
Prior art date
Application number
PCT/NO2007/000249
Other languages
French (fr)
Inventor
Edwin Poorte
Original Assignee
Norsk Hydro Produksjon A.S.
Shell Internationale Research Maatschappij B.V.
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 Norsk Hydro Produksjon A.S., Shell Internationale Research Maatschappij B.V. filed Critical Norsk Hydro Produksjon A.S.
Priority to US12/307,721 priority Critical patent/US20090321366A1/en
Priority to GB0902047A priority patent/GB2453897B/en
Priority to AU2007270187A priority patent/AU2007270187A1/en
Publication of WO2008004883A1 publication Critical patent/WO2008004883A1/en

Links

Classifications

    • 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/36—Underwater separating arrangements
    • 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

Definitions

  • the invention relates to a method of processing and separating a multiphase well effluent mixture.
  • Such a method is known from OTC paper 17399 "Subsea Gas Compression - Challenges and Solutions” presented by R.Fantoft at the Offshore Technology Conference held in Houston, USA on 2-5 May 2005 and from International patent applications WO30/033870, WO03/035335 and WO 2005/026497.
  • the method known from WO2005/026497 comprises: - transferring the multiphase well effluent mixture via a multiphase well effluent flowline to a gas liquid separator in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; - transferring the substantially liquid fraction into a liquid flowline in which a liquid pump is arranged;
  • liquid in the liquid flowline may be cooled and recycled into the multiphase well effluent flowline, but in case the well effluents are substantially liquid, then the gas compressor may be substantially solely fed with recycled gas, so that the influx of substantially liquid well effluents and of recycled cooled liquid is inhibited.
  • a method of processing and separating a multiphase well effluent mixture comprising: - transferring the multiphase well effluent mixture via a multiphase well effluent flowline to a gas liquid separator in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions;
  • recycled gas is contacted with liquid by injecting recycled gas into a liquid filled section of the gas liquid separator.
  • the gas liquid separator may be a gravity separation vessel and liquid filled section is located near the bottom of the vessel .
  • Optionally recycled gas is injected into the liquid filled section by a series of gas injection nozzles, which inject the recycled gas as an array of finely dispersed gas bubbles into the liquid.
  • the series of gas injection nozzles is arranged in a ring shaped gas injection conduit, which is located at a selected distance above the bottom of the gravity separation vessel .
  • FIG.l depicts a schematic view of a gas processing and separation assembly in which recycled gas is cooled by the method according to the invention.
  • FIG.2 is a top view of the ring-shaped gas injection conduit for injecting finely dispersed gas bubbles into the gas liquid separating vessel .
  • FIG.l depicts a gas liquid separator 1 into which a multiphase well effluent mixture G+L is injected via a multiphase well effluent flowline 2, which is connected to one or more subsea wells 3.
  • the separator 1 is installed on the seabed 4 and is immersed in the sea or other body of water 5.
  • the separator 1 is a gravity separator in which liquid is collected at the bottom of the separating vessel and gas rises to the top of the vessel.
  • a liquid stream L is subsequently drained from the bottom of the separator 1 via a liquid flowline 6 in which a liquid pump 7 is arranged.
  • a gaseous stream G is discharged from the top of the separator via a gas flowline 8 in which a gas compressor 9 is arranged.
  • a gas recycling conduit 10 is arranged between the gas flowline 9 at a location downstream of the compressor 9 and the interior of the separator 1.
  • the gas recycling conduit 10 comprises an anti surge valve 11, which is opened if sensors detect the onset of a pressure surge across compressor 9, which may be due to a lack of gas supply at the inlet of the compressor and/or backflow of compressed gas through the compressor 9, which may cause severe mechanical damage to the rotating or static parts of the compressor 9, and/or of a liquid surge within the separator 1. If the valve 11 is opened compressed gas G hot / which is heated by the compressor 9 is recycled into the separator 1.
  • the recycled gas In order to cool the recycled gas, which may be recycled several times and is further heated during each recycling step, the recycled gas is injected as a finely dispersed array of gas bubbles 12 into the liquid L at the bottom of the separator 1 via a ring-shaped gas injection conduit 13 in which a series of gas injection nozzles 14 is arranged.
  • FIG.2 depicts a top view of the ring-shaped gas injection conduit 13 and gas injection nozzles 14.
  • the gas recycle conduit 10 is optionally provided with a heat exchanger 15, which may be relatively small since at least part of the cooling of the recycled gas is accomplished by contacting the small gas bubbles 12 ' with the relatively cold liquid near the bottom of the separator.
  • At least part of the liquid L may evaporate as a result of the contact with the hot recycled gas stream G hot -
  • the liquid L may comprise gas condensates (C2-C6) and calculations indicate that if a volume of 5 m 3 of gas condensates is heated from 10 to 50 °C then this will correspond to about 10 MW during about 20 seconds, such that the recycled gas stream Gho t is cooled substantially and the heat exchanger 15 may be small or even redundant .

Abstract

A method of processing a multiphase well effluent mixture comprises : transferring the mixture (L+G) via a multiphase well effluent flowline (2) to a gas liquid separator (1) in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; transferring the substantially liquid fraction (L) into a liquid flowline (6) in which a liquid pump (7) is arranged; transferring the substantially gaseous fraction (G) into a gas flowline (8) in which a gas compressor (9) is arranged; protecting the gas compressor (9) against liquid and/or pressure surges due to low gas flow rate and/or backflow of compressed gas by recirculating a recycled gas stream (Ghot) via a gas recycling conduit (10) through the gas compressor in response to detection of the onset of a liquid surge in the multiphase well effluent mixture and/or of a pressure surge due to low gas flow rate and/or a high pressure differential across the gas compressor (9); and cooling the recycled gas stream by contacting recycled hot gas (Ghot) with relatively cold liquid L within the separator (1) or associated flowlines (2, 6) preferably using an array of gas injection nozzles (14) which inject the hot gas (Ghot) as finely dispersed gas bubbles into the liquid (L).

Description

METHOD OF PROCESSING AND SEPARATING A MULTIPHASE WELL EFFLUENT MIXTURE
BACKGROUND OFTHEINVENTION
The invention relates to a method of processing and separating a multiphase well effluent mixture.
Such a method is known from OTC paper 17399 "Subsea Gas Compression - Challenges and Solutions" presented by R.Fantoft at the Offshore Technology Conference held in Houston, USA on 2-5 May 2005 and from International patent applications WO30/033870, WO03/035335 and WO 2005/026497. The method known from WO2005/026497 comprises: - transferring the multiphase well effluent mixture via a multiphase well effluent flowline to a gas liquid separator in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; - transferring the substantially liquid fraction into a liquid flowline in which a liquid pump is arranged;
- transferring the substantially gaseous fraction into a gas flowline in which a gas compressor is arranged;
- protecting the gas compressor against pressure and/or liquid surges by recirculating a recycled gas stream via a gas recycling conduit through the gas compressor in response to detection of the onset of pressure and/or liquid surges in the multiphase well effluent mixture. In the method known from WO2005/026497 the recycled gas is heated up each time when it is compressed in the gas compressor and subsequently cooled in a heat exchanger arranged in the gas recycling conduit. Such a heat exchanger is a large piece of equipment because heat conductivity of the recycled gas is small, so that a large heat exchanging surface is required to cool the recycled gas stream to such a temperature that overheating of the gas compressor is prevented.
In the known method liquid in the liquid flowline may be cooled and recycled into the multiphase well effluent flowline, but in case the well effluents are substantially liquid, then the gas compressor may be substantially solely fed with recycled gas, so that the influx of substantially liquid well effluents and of recycled cooled liquid is inhibited.
It is an object of the present invention to provide an improved method of processing and separating a multiphase well effluent mixture.
It is a further object of the present invention to provide an improved method of processing and separating a multi- phase well effluent mixture in which a gas compressor is protected against liquid surges and overheating by a gas recirculating conduit in which the need for a bulky gas- liquid heat exchanger in the gas recycling conduit is obviated. SUMMARY OF THE INVENTION
In accordance with the invention there is provided a method of processing and separating a multiphase well effluent mixture, the method comprising: - transferring the multiphase well effluent mixture via a multiphase well effluent flowline to a gas liquid separator in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions;
- transferring the substantially liquid fraction into a liquid flowline in which a liquid pump is arranged;
- transferring the substantially gaseous fraction into a gas flowline in which a gas compressor is arranged;
- protecting the gas compressor against pressure and/or liquid surges by recirculating a recycled gas stream via a gas recycling conduit through the gas compressor in response to detection of a pressure and/or liquid surge in the multiphase well effluent mixture and/or of a high pressure differential across the gas compressor; and
- cooling the recycled gas stream by contacting recycled gas with liquid.
It is preferred that recycled gas is contacted with liquid by injecting recycled gas into a liquid filled section of the gas liquid separator.
The gas liquid separator may be a gravity separation vessel and liquid filled section is located near the bottom of the vessel .
Optionally recycled gas is injected into the liquid filled section by a series of gas injection nozzles, which inject the recycled gas as an array of finely dispersed gas bubbles into the liquid.
Preferably the series of gas injection nozzles is arranged in a ring shaped gas injection conduit, which is located at a selected distance above the bottom of the gravity separation vessel .
These and other features, embodiments and advantages of the method according to the invention are described in the accompanying claims, abstract and the following detailed description of preferred embodiments in which reference is made to the accompanying drawings .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.l depicts a schematic view of a gas processing and separation assembly in which recycled gas is cooled by the method according to the invention; and
FIG.2 is a top view of the ring-shaped gas injection conduit for injecting finely dispersed gas bubbles into the gas liquid separating vessel .
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG.l depicts a gas liquid separator 1 into which a multiphase well effluent mixture G+L is injected via a multiphase well effluent flowline 2, which is connected to one or more subsea wells 3. The separator 1 is installed on the seabed 4 and is immersed in the sea or other body of water 5.
The separator 1 is a gravity separator in which liquid is collected at the bottom of the separating vessel and gas rises to the top of the vessel. A liquid stream L is subsequently drained from the bottom of the separator 1 via a liquid flowline 6 in which a liquid pump 7 is arranged. A gaseous stream G is discharged from the top of the separator via a gas flowline 8 in which a gas compressor 9 is arranged.
In order to protect the gas compressor 9 against damage due to back flow of gas through the interior of the compressor 9 and/or against surges of liquid due to liquid overflow of the gas liquid separator 1 a gas recycling conduit 10 is arranged between the gas flowline 9 at a location downstream of the compressor 9 and the interior of the separator 1. The gas recycling conduit 10 comprises an anti surge valve 11, which is opened if sensors detect the onset of a pressure surge across compressor 9, which may be due to a lack of gas supply at the inlet of the compressor and/or backflow of compressed gas through the compressor 9, which may cause severe mechanical damage to the rotating or static parts of the compressor 9, and/or of a liquid surge within the separator 1. If the valve 11 is opened compressed gas Ghot/ which is heated by the compressor 9 is recycled into the separator 1. In order to cool the recycled gas, which may be recycled several times and is further heated during each recycling step, the recycled gas is injected as a finely dispersed array of gas bubbles 12 into the liquid L at the bottom of the separator 1 via a ring-shaped gas injection conduit 13 in which a series of gas injection nozzles 14 is arranged. FIG.2 depicts a top view of the ring-shaped gas injection conduit 13 and gas injection nozzles 14. In order to further cool the recycled hot gas Ghot the gas recycle conduit 10 is optionally provided with a heat exchanger 15, which may be relatively small since at least part of the cooling of the recycled gas is accomplished by contacting the small gas bubbles 12' with the relatively cold liquid near the bottom of the separator. At least part of the liquid L may evaporate as a result of the contact with the hot recycled gas stream Ghot- The liquid L may comprise gas condensates (C2-C6) and calculations indicate that if a volume of 5 m3 of gas condensates is heated from 10 to 50 °C then this will correspond to about 10 MW during about 20 seconds, such that the recycled gas stream Ghot is cooled substantially and the heat exchanger 15 may be small or even redundant .
It will be understood that the use of a ring shaped gas injection conduit 14 is optional and that there may be alternative ways to vigorously mix the recycled gas stream Ghot with liquid within the separator 1 or within the well effluent and/or liquid flowlines 2,6.

Claims

Claims :
1. A method of processing and separating a multiphase well effluent mixture, the method comprising: - transferring the multiphase well effluent mixture via a multiphase well effluent flowline to a gas liquid separator in which the multiphase well effluent mixture is separated into substantially gaseous and liquid fractions; - transferring the substantially liquid fraction into a liquid flowline in which a liquid pump is arranged;
- transferring the substantially gaseous fraction into a gas flowline in which a gas compressor is arranged;
- protecting the gas compressor against pressure and/or liquid surges by recirculating a recycled gas stream via a gas recycling conduit through the gas compressor in response to detection of the onset of a pressure and/or liquid surge in the multiphase well effluent mixture and/or of a high pressure differential across the gas compressor; and
- cooling the recycled gas stream by contacting recycled gas with liquid.
2. The method of claim 1, wherein recycled gas is contacted with liquid by injecting recycled gas into a liquid filled section of the gas liquid separator.
3. The method of claim 2 , wherein the gas liquid separator is a gravity separation vessel and liquid filled section is located near the bottom of the vessel .
4. The method of claim 3, wherein gas is injected into the liquid filled section by a series of gas injection nozzles, which inject the recycled gas as an array of finely dispersed gas bubbles into the liquid.
5. The method of claim 4, wherein the series of gas injection nozzles is arranged in a ring shaped gas injection conduit, which is located at a selected distance above the bottom of the gravity separation vessel.
6. The method of claim 1, wherein the gas liquid separation vessel is located near the bottom of a body of water.
PCT/NO2007/000249 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture WO2008004883A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/307,721 US20090321366A1 (en) 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture
GB0902047A GB2453897B (en) 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture
AU2007270187A AU2007270187A1 (en) 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20063169 2006-07-07
NO20063169A NO325930B1 (en) 2006-07-07 2006-07-07 Process for processing and separating a multi-phase well flow mixture

Publications (1)

Publication Number Publication Date
WO2008004883A1 true WO2008004883A1 (en) 2008-01-10

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US (1) US20090321366A1 (en)
AU (1) AU2007270187A1 (en)
GB (1) GB2453897B (en)
NO (1) NO325930B1 (en)
WO (1) WO2008004883A1 (en)

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WO2010014770A1 (en) * 2008-07-31 2010-02-04 Shell Oil Company Method and system for subsea processing of multiphase well effluents
WO2010019052A1 (en) * 2008-08-15 2010-02-18 Aker Subsea As Device for separating and collecting fluid in gas from a reservoir
WO2010102905A1 (en) * 2009-03-10 2010-09-16 Siemens Aktiengesellschaft Drain liquid relief system for a subsea compressor and a method for draining the subsea compressor
WO2010129749A1 (en) * 2009-05-06 2010-11-11 Curtiss-Wright Electro-Mechanical Corporation Gas tolerant subsea pump
EP2507516A1 (en) * 2009-12-04 2012-10-10 Nuovo Pignone S.p.A. A compressor unit and a method to process a working fluid
WO2013187771A1 (en) * 2012-06-14 2013-12-19 Aker Subsea As Using wellstream heat exchanger for flow assurance
WO2013187773A1 (en) * 2012-06-14 2013-12-19 Aker Subsea As Heat exchange from compressed gas
WO2013062419A3 (en) * 2011-10-27 2014-01-16 Aker Subsea As A method of draining a fluid tank in a fluid separation system
RU2538140C1 (en) * 2013-07-12 2015-01-10 Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" Station for transfer and separation of multiphase mix
RU2748173C1 (en) * 2020-11-11 2021-05-20 Публичное акционерное общество «Татнефть» имени В.Д. Шашина System for collecting and transporting oil well products

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NO325979B1 (en) * 2006-07-07 2008-08-25 Shell Int Research System and method for dressing a multiphase source stream
GB2468920A (en) * 2009-03-27 2010-09-29 Framo Eng As Subsea cooler for cooling a fluid flowing in a subsea flow line
NO331264B1 (en) * 2009-12-29 2011-11-14 Aker Subsea As System and method for controlling a submarine located compressor, and using an optical sensor thereto
IT1401274B1 (en) * 2010-07-30 2013-07-18 Nuova Pignone S R L SUBMARINE MACHINE AND METHODS FOR SEPARATING COMPONENTS OF A MATERIAL FLOW
NO336594B1 (en) * 2012-03-14 2015-10-05 Fmc Kongsberg Subsea As Underwater flow splitter arrangement
WO2014018585A1 (en) * 2012-07-24 2014-01-30 Shell Oil Company Apparatus, system and method for removing gas from fluid produced from a wellbore
WO2014031728A1 (en) * 2012-08-23 2014-02-27 Shell Oil Company System and method for separating fluid produced from a wellbore
US10801482B2 (en) 2014-12-08 2020-10-13 Saudi Arabian Oil Company Multiphase production boost method and system
WO2016148577A1 (en) * 2015-03-16 2016-09-22 Seabed Separation As Method and system for subsea purification of produced water from subsea oil producing installations
BR102020004027A2 (en) * 2020-02-28 2021-09-08 Petróleo Brasileiro S.A. - Petrobras OFFSHORE GAS PRODUCTION SYSTEM AND METHOD SINGLE-PHASE DRAINAGE TO EARTH

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WO2005026497A1 (en) * 2003-09-12 2005-03-24 Kværner Oilfield Products A.S. Subsea compression system and method

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GB2475184A (en) * 2008-07-31 2011-05-11 Shell Int Research Method and system for subsea processing of multiphase well effluents
AU2009276524B2 (en) * 2008-07-31 2013-02-28 Shell Internationale Research Maatschappij B.V. Method and system for subsea processing of multiphase well effluents
GB2475184B (en) * 2008-07-31 2011-10-19 Shell Int Research Method and system for subsea processing of multiphase well effluents
CN102105651A (en) * 2008-07-31 2011-06-22 国际壳牌研究有限公司 Method and system for subsea processing of multiphase well effluents
WO2010014770A1 (en) * 2008-07-31 2010-02-04 Shell Oil Company Method and system for subsea processing of multiphase well effluents
GB2475206A (en) * 2008-08-15 2011-05-11 Aker Subsea As Device for separating and collecting fluid in gas from a reservoir
WO2010019052A1 (en) * 2008-08-15 2010-02-18 Aker Subsea As Device for separating and collecting fluid in gas from a reservoir
AU2009280364B2 (en) * 2008-08-15 2016-05-19 Aker Solutions As Device for separating and collecting fluid in gas from a reservoir
US8771394B2 (en) 2008-08-15 2014-07-08 Aker Subsea Device for separating and collecting fluid in gas from a reservoir
EP2233745A1 (en) * 2009-03-10 2010-09-29 Siemens Aktiengesellschaft Drain liquid relief system for a subsea compressor and a method for draining the subsea compressor
WO2010102905A1 (en) * 2009-03-10 2010-09-16 Siemens Aktiengesellschaft Drain liquid relief system for a subsea compressor and a method for draining the subsea compressor
CN102348899A (en) * 2009-03-10 2012-02-08 西门子公司 Drain liquid relief system for a subsea compressor and a method for draining the subsea compressor
EP2427632A4 (en) * 2009-05-06 2015-01-07 Curtiss Wright Electro Mechanical Corp Gas tolerant subsea pump
US8393876B2 (en) 2009-05-06 2013-03-12 Curtiss-Wright Electro-Mechanical Corp. Gas tolerant subsea pump
WO2010129749A1 (en) * 2009-05-06 2010-11-11 Curtiss-Wright Electro-Mechanical Corporation Gas tolerant subsea pump
EP2427632A1 (en) * 2009-05-06 2012-03-14 Curtiss-Wright Electro-Mechanical Corporation Gas tolerant subsea pump
EP2507516A1 (en) * 2009-12-04 2012-10-10 Nuovo Pignone S.p.A. A compressor unit and a method to process a working fluid
EP2507516B1 (en) * 2009-12-04 2021-08-25 NUOVO PIGNONE INTERNATIONAL S.r.l. Compressor unit and method to process a working fluid
WO2013062419A3 (en) * 2011-10-27 2014-01-16 Aker Subsea As A method of draining a fluid tank in a fluid separation system
WO2013187771A1 (en) * 2012-06-14 2013-12-19 Aker Subsea As Using wellstream heat exchanger for flow assurance
WO2013187773A1 (en) * 2012-06-14 2013-12-19 Aker Subsea As Heat exchange from compressed gas
AU2013274973B2 (en) * 2012-06-14 2016-11-10 Aker Subsea As Heat exchange from compressed gas
RU2538140C1 (en) * 2013-07-12 2015-01-10 Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" Station for transfer and separation of multiphase mix
RU2748173C1 (en) * 2020-11-11 2021-05-20 Публичное акционерное общество «Татнефть» имени В.Д. Шашина System for collecting and transporting oil well products

Also Published As

Publication number Publication date
NO20063169L (en) 2008-01-08
GB0902047D0 (en) 2009-03-11
AU2007270187A1 (en) 2008-01-10
US20090321366A1 (en) 2009-12-31
GB2453897A (en) 2009-04-22
GB2453897B (en) 2011-04-06
NO325930B1 (en) 2008-08-18

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