US20090321366A1 - Method of processing and separating a multiphase well effluent mixture - Google Patents
Method of processing and separating a multiphase well effluent mixture Download PDFInfo
- 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
- Authority
- US
- United States
- Prior art keywords
- gas
- liquid
- recycled
- well effluent
- multiphase well
- 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.)
- Abandoned
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 230000003134 recirculating effect Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000004941 influx Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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 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
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
- 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.
- 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.
-
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. -
FIG. 1 depicts a gas liquid separator 1 into which a multiphase well effluent mixture G+L is injected via a multiphase welleffluent flowline 2, which is connected to one ormore subsea wells 3. The separator 1 is installed on theseabed 4 and is immersed in the sea or other body ofwater 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 agas compressor 9 is arranged. - In order to protect the
gas compressor 9 against damage due to back flow of gas through the interior of thecompressor 9 and/or against surges of liquid due to liquid overflow of the gas liquid separator 1 agas recycling conduit 10 is arranged between thegas flowline 9 at a location down-stream of thecompressor 9 and the interior of the separator 1. Thegas recycling conduit 10 comprises ananti surge valve 11, which is opened if sensors detect the onset of a pressure surge acrosscompressor 9, which may be due to a lack of gas supply at the inlet of the compressor and/or backflow of compressed gas through thecompressor 9, which may cause severe mechanical damage to the rotating or static parts of thecompressor 9, and/or of a liquid surge within the separator 1. If thevalve 11 is opened compressed gas Ghot, which is heated by thecompressor 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 ofgas bubbles 12 into the liquid L at the bottom of the separator 1 via a ring-shapedgas injection conduit 13 in which a series ofgas injection nozzles 14 is arranged.FIG. 2 depicts a top view of the ring-shapedgas injection conduit 13 andgas injection nozzles 14. - In order to further cool the recycled hot gas Ghot the
gas recycle conduit 10 is optionally provided with aheat exchanger 15, which may be relatively small since at least part of the cooling of the recycled gas is accomplished by contacting thesmall 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 theheat 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/orliquid flowlines
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.
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 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090321366A1 true US20090321366A1 (en) | 2009-12-31 |
Family
ID=38894779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/307,721 Abandoned US20090321366A1 (en) | 2006-07-07 | 2007-07-02 | Method of processing and separating a multiphase well effluent mixture |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090321366A1 (en) |
AU (1) | AU2007270187A1 (en) |
GB (1) | GB2453897B (en) |
NO (1) | NO325930B1 (en) |
WO (1) | WO2008004883A1 (en) |
Cited By (10)
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 |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO321304B1 (en) * | 2003-09-12 | 2006-04-24 | Kvaerner Oilfield Prod As | Underwater compressor station |
-
2006
- 2006-07-07 NO NO20063169A patent/NO325930B1/en unknown
-
2007
- 2007-07-02 AU AU2007270187A patent/AU2007270187A1/en not_active Abandoned
- 2007-07-02 GB GB0902047A patent/GB2453897B/en not_active Expired - Fee Related
- 2007-07-02 US US12/307,721 patent/US20090321366A1/en not_active Abandoned
- 2007-07-02 WO PCT/NO2007/000249 patent/WO2008004883A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
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 |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |