AU2007270187A1 - 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
- AU2007270187A1 AU2007270187A1 AU2007270187A AU2007270187A AU2007270187A1 AU 2007270187 A1 AU2007270187 A1 AU 2007270187A1 AU 2007270187 A AU2007270187 A AU 2007270187A AU 2007270187 A AU2007270187 A AU 2007270187A AU 2007270187 A1 AU2007270187 A1 AU 2007270187A1
- Authority
- AU
- Australia
- Prior art keywords
- gas
- liquid
- recycled
- well effluent
- compressor
- 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
- 238000000034 method Methods 0.000 title claims description 20
- 239000000203 mixture Substances 0.000 title claims description 18
- 239000007788 liquid Substances 0.000 claims description 61
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 230000003134 recirculating effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
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 Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gas Separation By Absorption (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Treating Waste Gases (AREA)
- Pipeline Systems (AREA)
Description
WO 2008/004883 PCT/N02007/000249 1 5 METHOD OF PROCESSING AND SEPARATING A MULTIPHASE WELL EFFLUENT MIXTURE BACKGROUND OF THE INVENTION 10 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 15 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 W030/033870, W003/035335 and WO 2005/026497. The method known from W02005/026497 comprises: 20 - 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; 25 - 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 30 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.
WO 2008/004883 PCT/N02007/000249 2 In the method known from W02005/026497 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 5 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. 10 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 15 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 20 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 25 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. 30 WO 2008/004883 PCT/N02007/000249 3 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: 5 - 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 10 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 15 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 20 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. 25 The gas liquid separator may be a gravity separation vessel and liquid filled section is located near the bottom of the vessel. 30 Optionally recycled gas is injected into the liquid filled section by a series of gas injection nozzles, which inject WO 2008/004883 PCT/N02007/000249 4 the recycled gas as an array of finely dispersed gas bubbles into the liquid. Preferably the series of gas injection nozzles is arranged 5 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 10 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. 15 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 20 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 25 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. 30 The separator 1 is a gravity separator in which liquid is collected at the bottom of the separating vessel and gas WO 2008/004883 PCT/N02007/000249 5 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 5 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 10 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 15 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 20 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 25 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 30 view of the ring-shaped gas injection conduit 13 and gas injection nozzles 14.
WO 2008/004883 PCT/N02007/000249 6 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 5 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 10 that if a volume of 5 m 3 of gas condensates is heated from 10 to 50 0 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. 15 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 20 effluent and/or liquid flowlines 2,6.
Claims (6)
1. A method of processing and separating a multiphase well effluent mixture, the method comprising: 5 - 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; 10 - 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 15 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 20 compressor; and - cooling the recycled gas stream by contacting recycled gas with liquid.
2. The method of claim 1, wherein recycled gas is contacted 25 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 30 is located near the bottom of the vessel. WO 2008/004883 PCT/N02007/000249 8
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
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 10 vessel.
6. The method of claim 1, wherein the gas liquid separation vessel is located near the bottom of a body of water. 15
Applications Claiming Priority (3)
| 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 |
| 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 |
|---|---|
| AU2007270187A1 true AU2007270187A1 (en) | 2008-01-10 |
Family
ID=38894779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2007270187A Abandoned AU2007270187A1 (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) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO325979B1 (en) * | 2006-07-07 | 2008-08-25 | Shell Int Research | System and method for dressing a multiphase source stream |
| 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 |
| GB2468920A (en) * | 2009-03-27 | 2010-09-29 | Framo Eng As | Subsea cooler for cooling a fluid flowing in a subsea flow line |
| US8393876B2 (en) | 2009-05-06 | 2013-03-12 | Curtiss-Wright Electro-Mechanical Corp. | Gas tolerant subsea pump |
| IT1396518B1 (en) * | 2009-12-04 | 2012-12-14 | Nuovo Pignone Spa | A COMPRESSOR UNIT AND A METHOD FOR PROCESSING A WORKING FLUID |
| 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 |
| NO333261B1 (en) * | 2011-10-27 | 2013-04-22 | Aker Subsea As | Method of draining one or more liquid collectors |
| NO336594B1 (en) * | 2012-03-14 | 2015-10-05 | Fmc Kongsberg Subsea As | Underwater flow splitter arrangement |
| 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 |
| 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 |
| RU2538140C1 (en) * | 2013-07-12 | 2015-01-10 | Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" | Station for transfer and separation of multiphase mix |
| US10801482B2 (en) | 2014-12-08 | 2020-10-13 | Saudi Arabian Oil Company | Multiphase production boost method and system |
| CA2978078A1 (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 |
| RU2748173C1 (en) * | 2020-11-11 | 2021-05-20 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | System for collecting and transporting oil well products |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2038130C1 (en) * | 1989-05-02 | 1995-06-27 | Чиеда Корпорейшн | Method and equipment for cleaning waste gases |
| FR2788815B1 (en) * | 1999-01-26 | 2005-11-18 | Inst Francais Du Petrole | SYSTEM COMPRISING A SINGLE-PHASE COMPRESSION UNIT ASSOCIATED WITH A POLYPHASE COMPRESSION UNIT |
| 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
Also Published As
| Publication number | Publication date |
|---|---|
| GB2453897A (en) | 2009-04-22 |
| GB0902047D0 (en) | 2009-03-11 |
| NO325930B1 (en) | 2008-08-18 |
| GB2453897B (en) | 2011-04-06 |
| US20090321366A1 (en) | 2009-12-31 |
| WO2008004883A1 (en) | 2008-01-10 |
| NO20063169L (en) | 2008-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |