US20090321366A1 - Method of processing and separating a multiphase well effluent mixture - Google Patents

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

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Publication number
US20090321366A1
US20090321366A1 US12/307,721 US30772107A US2009321366A1 US 20090321366 A1 US20090321366 A1 US 20090321366A1 US 30772107 A US30772107 A US 30772107A US 2009321366 A1 US2009321366 A1 US 2009321366A1
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gas
liquid
recycled
well effluent
multiphase well
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Abandoned
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US12/307,721
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Edwin Poorte
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Shell USA Inc
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Individual
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Assigned to SHELL OIL COMPANY reassignment SHELL OIL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POORTE, EDWIN
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00Pipe-line systems
    • F17D1/005Pipe-line systems for a two-phase gas-liquid flow
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34Arrangements for separating materials produced by the well
    • E21B43/36Underwater separating arrangements

Definitions

  • the invention relates to a method of processing and separating a multiphase well effluent mixture.
  • 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.
  • 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.
  • 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.
  • 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. 1 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. 1 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 down-stream 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 .
  • 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 G hot is cooled substantially and the heat exchanger 15 may be small or even redundant.
  • a ring shaped gas injection conduit 14 is optional and that there may be alternative ways to vigorously mix the recycled gas stream G hot with liquid within the separator 1 or within the well effluent and/or liquid flowlines 2 , 6 .

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 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

    BACKGROUND OF THE INVENTION
  • 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. 1 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. 1 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 down-stream 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 (6)

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.
US12/307,721 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture Abandoned US20090321366A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20063169A NO325930B1 (en) 2006-07-07 2006-07-07 Process for processing and separating a multi-phase well flow mixture
NO20063169 2006-07-07
PCT/NO2007/000249 WO2008004883A1 (en) 2006-07-07 2007-07-02 Method of processing and separating a multiphase well effluent mixture

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

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100006291A1 (en) * 2006-07-07 2010-01-14 Edwin Poorte Method of cooling a multiphase well effluent stream
JP2012031722A (en) * 2010-07-30 2012-02-16 Nuovo Pignone Spa Undersea device and method to separate component in substance flow
US20120103621A1 (en) * 2009-03-27 2012-05-03 Framo Engineering As Subsea system with subsea cooler and method for cleaning the subsea cooler
US20120257990A1 (en) * 2009-12-29 2012-10-11 Erikson Klas Goeran Control of subsea compressors
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
US20150101820A1 (en) * 2012-03-14 2015-04-16 Fmc Kongsberg Subsea As Subsea flow splitting arrangement
US20180073343A1 (en) * 2015-03-16 2018-03-15 Seabed Separation As Method and System for Subsea Purification of Produced Water From Subsea Oil Producing Installations
US10774822B2 (en) 2014-12-08 2020-09-15 Saudi Arabian Oil Company Multiphase production boost method and system
WO2021168525A1 (en) * 2020-02-28 2021-09-02 Petróleo Brasileiro S.A. - Petrobras System and method for offshore gas production with a single-phase flow to shore

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EP2149673A1 (en) * 2008-07-31 2010-02-03 Shell Internationale Researchmaatschappij B.V. Method and system for subsea processing of multiphase well effluents
NO330768B1 (en) * 2008-08-15 2011-07-11 Aker Subsea As Apparatus for the separation and collection of liquid 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
DK2427632T3 (en) 2009-05-06 2017-04-03 Curtiss-Wright Electro-Mechanical Corp Gas-resistant underwater pump
IT1396518B1 (en) * 2009-12-04 2012-12-14 Nuovo Pignone Spa A COMPRESSOR UNIT AND A METHOD FOR PROCESSING A WORKING FLUID
NO20111455A1 (en) * 2011-10-27 2013-04-22 Aker Subsea As Method for draining one or more liquid collectors
NO335390B1 (en) * 2012-06-14 2014-12-08 Aker Subsea As Heat exchange from compressed gas
NO335391B1 (en) * 2012-06-14 2014-12-08 Aker Subsea As Use of well stream heat exchanger for flow protection
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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US5645802A (en) * 1989-05-02 1997-07-08 Chiyoda Corporation Method and apparatus for the treatment of a waste gas containing dists and chemical contaminants
US6276902B1 (en) * 1999-01-26 2001-08-21 Institut Francais Du Petrole System comprising a single-phase compression unit associated with a multiphase compression unit

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NO321304B1 (en) * 2003-09-12 2006-04-24 Kvaerner Oilfield Prod As Underwater compressor station

Patent Citations (2)

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US5645802A (en) * 1989-05-02 1997-07-08 Chiyoda Corporation Method and apparatus for the treatment of a waste gas containing dists and chemical contaminants
US6276902B1 (en) * 1999-01-26 2001-08-21 Institut Francais Du Petrole System comprising a single-phase compression unit associated with a multiphase compression unit

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100006291A1 (en) * 2006-07-07 2010-01-14 Edwin Poorte Method of cooling a multiphase well effluent stream
US20120103621A1 (en) * 2009-03-27 2012-05-03 Framo Engineering As Subsea system with subsea cooler and method for cleaning the subsea cooler
US9163482B2 (en) * 2009-03-27 2015-10-20 Framo Engineering As Subsea system with subsea cooler and method for cleaning the subsea cooler
US20120257990A1 (en) * 2009-12-29 2012-10-11 Erikson Klas Goeran Control of subsea compressors
US9382921B2 (en) * 2009-12-29 2016-07-05 Aker Subsea As Control of subsea compressors
JP2012031722A (en) * 2010-07-30 2012-02-16 Nuovo Pignone Spa Undersea device and method to separate component in substance flow
US20150101820A1 (en) * 2012-03-14 2015-04-16 Fmc Kongsberg Subsea As Subsea flow splitting arrangement
US9410416B2 (en) * 2012-03-14 2016-08-09 Fmc Kongsberg Subsea As Subsea flow splitting 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
US10774822B2 (en) 2014-12-08 2020-09-15 Saudi Arabian Oil Company Multiphase production boost method and system
US10801482B2 (en) 2014-12-08 2020-10-13 Saudi Arabian Oil Company Multiphase production boost method and system
US20180073343A1 (en) * 2015-03-16 2018-03-15 Seabed Separation As Method and System for Subsea Purification of Produced Water From Subsea Oil Producing Installations
WO2021168525A1 (en) * 2020-02-28 2021-09-02 Petróleo Brasileiro S.A. - Petrobras System and method for offshore gas production with a single-phase flow to shore

Also Published As

Publication number Publication date
WO2008004883A1 (en) 2008-01-10
NO325930B1 (en) 2008-08-18
AU2007270187A1 (en) 2008-01-10
GB2453897B (en) 2011-04-06
GB2453897A (en) 2009-04-22
NO20063169L (en) 2008-01-08
GB0902047D0 (en) 2009-03-11

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Owner name: SHELL OIL COMPANY, TEXAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:POORTE, EDWIN;REEL/FRAME:022894/0674

Effective date: 20090625

STCB Information on status: application discontinuation

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