EP2233689A1 - Integriertes Verfahren und System für Säuretraggas und erweiterte Ölwiedergewinnung mithilfe von Säuregas - Google Patents

Integriertes Verfahren und System für Säuretraggas und erweiterte Ölwiedergewinnung mithilfe von Säuregas Download PDF

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Publication number
EP2233689A1
EP2233689A1 EP09156550A EP09156550A EP2233689A1 EP 2233689 A1 EP2233689 A1 EP 2233689A1 EP 09156550 A EP09156550 A EP 09156550A EP 09156550 A EP09156550 A EP 09156550A EP 2233689 A1 EP2233689 A1 EP 2233689A1
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EP
European Patent Office
Prior art keywords
acid gas
gas
fraction
lift
formation
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.)
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Application number
EP09156550A
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English (en)
French (fr)
Inventor
van Arkel Johannes.
Goodyear Stephen Geoffrey
Koster Martin Paul
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Publication date
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Priority to EP09156550A priority Critical patent/EP2233689A1/de
Priority to US12/732,875 priority patent/US20100307765A1/en
Publication of EP2233689A1 publication Critical patent/EP2233689A1/de
Withdrawn legal-status Critical Current

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    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/164—Injecting CO2 or carbonated water
    • 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/122—Gas lift
    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons

Definitions

  • the invention relates to a method for an integrated system for acid gas-lift and Enhanced Oil Recovery(EOR) by miscible or sub-miscible displacement from a crude oil containing formation by injecting acid gas into the formation.
  • EOR Enhanced Oil Recovery
  • US patent 5,337,828 discloses a method of using CO 2 for gas lifting heavy oil, wherein the CO 2 is injected into an heavy crude oil production well through an injection conduit arranged within a crude oil production tubing within the well, thereby avoiding injection of CO2 into an annulus between the production tubing and well casing and inhibiting formation of a corrosive mixture of CO2 and water within the annulus.
  • Enhanced Oil Recovery projects using miscible gas, such as CO 2 and/or H 2 S, for injection usually require the production of reservoirs at high watercuts.
  • Flowing producers under these conditions require some form of artificial lift (e.g. electric submersible pumps (ESPs), hydraulic submersible pumps (HSPs), jet pumps or gas lift).
  • ESPs electric submersible pumps
  • HSPs hydraulic submersible pumps
  • jet pumps gas lift
  • CO 2 is typically injected in slugs alternating with periods of water injection. Initially the producers usually flow at very high watercuts and require artificial lift. As injected CO2 progressively breaks through at the producers together with incremental oil production, the lift performance of the wells improve as the column density is reduced. This is mainly due to the expanding CO 2 in the production tubing when it travels up from the bottom of the well to surface. Eventually the producers reach a point of autolift, where no artificial lift is any longer needed. During the time when back produced CO2 builds up, significant fluctuations in gas rate can occur (depending on the detail of the geology), so the well may experience periods of autolift followed by periods when artificial lift is required to maximise offtake rates and project economics.
  • a method of enhancing crude oil recovery from a crude oil containing formation using an integrated acid gas injection system which injects a first fraction of an available volume of acid gas into the formation and a second fraction of the available volume of acid gas as a lift gas into a crude oil production well traversing the formation.
  • the recycle compression may be used to reinject it in the reservoir or use it for ongoing gas lift.
  • the first acid gas fraction may be injected slugwise into the formation, and injection of acid gas slugs may be alternated by injection of water slugs into the formation.
  • the acid gas may comprise CO 2 and/or H 2 S with together with hydrocarbon gas or other contaminants obtained from a natural or industrial source and the first fraction may be injected into the formation through an injection well traversing the formation at a distance from the production well such that the first fraction mixes with and displaces crude oil within the pores of the formation by a miscible or sub-miscible process and flows towards the production well.
  • At least some part of the first acid gas fraction may be produced through the production tubing and then recycled with the fresh acid gas obtained from natural or industrial sources.
  • the rate and/or pressure at which the second acid gas fraction is injected into the injection conduit may be adjusted on the basis of one or more of the following parameters:
  • acid gas shall mean a gas which contains more than 1 mole% of hydrogen sulfide (H 2 S) and/or more than 5 mole% carbon dioxide (CO 2 ), wherein the acid gas may be obtained from an industrial source (e.g. extracted from furnace or turbine flue gas) and/or natural sources, and may comprise a mixture of CO 2 , H 2 S and natural gas produced from the crude oil containing formation.
  • H 2 S hydrogen sulfide
  • CO 2 carbon dioxide
  • the integrated acid gas-lift and EOR method according to the invention may be applied to reservoirs where continuous acid gas injection is the preferred secondary recovery method.
  • Figure 1 shows a crude oil containing formation 1, which is located underneath an overburden 2 and is traversed by an acid gas injection well 3 and a crude oil production well 4.
  • the crude oil production well 4 comprises a well casing 5, which is perforated near the bottom of the well to enable influx of crude oil into the well 4 as illustrated by arrows 6.
  • a volume of acid gas obtained from a natural or an industrial acid gas source 7 is distributed to the field well pads or well head platforms through a distribution network 22 and split at a manifold 21 into a first fraction 11, which is injected into the formation 1 through perforations 13 in a well casing 14 within the acid gas injection well 3 as illustrated by arrow 15, and a second fraction 12, which is injected as lift gas into a lift gas injection conduit 16 that is arranged within the interior of a production tubing 17, which is suspended within the well casing 5 from the wellhead 18 of the production well 4.
  • a conventional downhole safety valve 28 can be installed below the lift gas injection string 16 and above a production packer 19.
  • the rate of lift gas injection is controlled by a choke 23.
  • the packer 19 is arranged near the bottom of an annular space 20 between the production tubing 17 and well casing 5 to inhibit crude oil and/or acid gas lift gas to flow into the annular space 20.
  • Produced fluids comprising crude oil, brine (mixture of formation water and injected water), associated hydrocarbon gas, acid gas back produced from the reservoir and acid gas injected directly into the producer for gas lift are produced back to a Processing Facility(s) 24 through a flowline 28.
  • the Processing Facility(s) comprises facilities 25 to separate crude oil from brine and the produced gas (largely comprising acid gas with a level of hydrocarbon gas contamination).
  • This produced gas 27 (possibly after extraction of some of the hydrocarbon content) is compressed 26, where it is raised to high pressure for injection into the reservoir or for use in gas-lifting producers.
  • the high pressure gas 30 is combined with the fresh acid gas imported from the industrial source 7 and routed once more to the wells 3 for injection into the reservoir for Enhanced Oil Recovery and to the producers 4 for acid gasgas lift.
  • An advantage of the integrated system is that the second fraction 12 is used for acid gas lift without significant additional CAPEX (Capital Expenditure) using the basic system of surface facilities infrastructure (22, 28 and 24) required for acid gas Enhanced Oil Recovery.
  • CAPEX Capital Expenditure
  • Over the lifetime of a crude oil production project at most a small increase in the compression capacity can accommodate all the acid gas lift gas requirements within the same operating mode as is required in any case for the EOR project itself. Since the gas has to be compressed to inject into the formation 1, there is always sufficient pressure to operate a gas lift system without the need for conventional (potentially leaking) gas lift valves.
  • the artificial lift capacity can be progressively adjusted to match the wells potential and can respond to short term changes in gas production rate from the reservoir.
  • a principle drawback of conventional annular acid gas gas-lift is the corrosive nature of acid gas in the presence of brine.
  • Conventional annular gas lift risks corrosion in the annulus 20 and leakage through gas lift valves, making this option less practical on account of the material that would be required for the well casing 5. Even if the lift fluid would be dehydrated there will always be a "dead volume" below the deepest injection valve and above the production packer 19 where due to leakage corrosive fluids can accumulate.
  • the method according to the invention benefits from synergies between the EOR produced fluids processing facilities and acid gas lift in a fully integrated system using concentric lift strings to contain the acid gas (or any other configuration that protect the integrity of the well, including but not restricted to the use of a separate tubing within the annulus to convey acid gas to a deep injection point in the production tubing or full CRA casing), to reduce CAPEX and operational complexity compared to artificial lift schemes based on ESPs (or any other artificial lift method requiring a separate supporting surface system).

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP09156550A 2009-03-27 2009-03-27 Integriertes Verfahren und System für Säuretraggas und erweiterte Ölwiedergewinnung mithilfe von Säuregas Withdrawn EP2233689A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09156550A EP2233689A1 (de) 2009-03-27 2009-03-27 Integriertes Verfahren und System für Säuretraggas und erweiterte Ölwiedergewinnung mithilfe von Säuregas
US12/732,875 US20100307765A1 (en) 2009-03-27 2010-03-26 Method for using acid gas as lift-gas and to enhance oil recovery from a subsurface formation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09156550A EP2233689A1 (de) 2009-03-27 2009-03-27 Integriertes Verfahren und System für Säuretraggas und erweiterte Ölwiedergewinnung mithilfe von Säuregas

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EP2233689A1 true EP2233689A1 (de) 2010-09-29

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103429696A (zh) * 2010-12-29 2013-12-04 国际壳牌研究有限公司 从含有原油的地层中强化烃采收的方法和组合物
WO2017140629A1 (en) * 2016-02-16 2017-08-24 Shell Internationale Research Maatschappij B.V. System and method of enhanced oil recovery combined with a gas lift
CN114427429A (zh) * 2020-09-21 2022-05-03 中国石油化工股份有限公司 一种油井硫化氢井底处理的装置及方法
CN114991723A (zh) * 2022-06-16 2022-09-02 西南石油大学 一种基于石油天然气开采的气举系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013006232A1 (en) * 2011-07-01 2013-01-10 Exxonmobil Upstream Research Company Subsea sour gas and/or acid gas injection systems and methods
CA3005540C (en) * 2012-08-27 2020-03-31 Halliburton Energy Services, Inc. Constructed annular safety valve element package
US11131177B2 (en) 2017-07-10 2021-09-28 Exxonmobil Upstream Research Company Methods for deep reservoir stimulation using acid-forming fluids

Citations (6)

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EP0144203A2 (de) * 1983-11-25 1985-06-12 Bohdan M. Dr. Zakiewicz Gewinnung und Reformierung von ultraschweren Teeren und Öllagerstätten
GB2254634A (en) * 1991-04-12 1992-10-14 Bp Exploration Operating Multiple concentric bore tubing hanger
US5337828A (en) 1992-12-18 1994-08-16 Mobil Oil Corporation Use of carbon dioxide for gas-lifting heavy oil
RU2060378C1 (ru) * 1993-04-06 1996-05-20 Александр Константинович Шевченко Способ разработки нефтяного пласта
US6105672A (en) * 1997-06-17 2000-08-22 Institut Francais Du Petrole Enhanced petroleum fluid recovery process in an underground reservoir
WO2004063310A2 (en) * 2003-01-09 2004-07-29 Terry Earl Kelley Advanced gas injection method and apparatus liquid hydrocarbon recovery complex

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US4972704A (en) * 1989-03-14 1990-11-27 Shell Oil Company Method for troubleshooting gas-lift wells
US20010045287A1 (en) * 2000-02-14 2001-11-29 Brewer James Robert Gas lift method
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Publication number Priority date Publication date Assignee Title
EP0144203A2 (de) * 1983-11-25 1985-06-12 Bohdan M. Dr. Zakiewicz Gewinnung und Reformierung von ultraschweren Teeren und Öllagerstätten
GB2254634A (en) * 1991-04-12 1992-10-14 Bp Exploration Operating Multiple concentric bore tubing hanger
US5337828A (en) 1992-12-18 1994-08-16 Mobil Oil Corporation Use of carbon dioxide for gas-lifting heavy oil
RU2060378C1 (ru) * 1993-04-06 1996-05-20 Александр Константинович Шевченко Способ разработки нефтяного пласта
US6105672A (en) * 1997-06-17 2000-08-22 Institut Francais Du Petrole Enhanced petroleum fluid recovery process in an underground reservoir
WO2004063310A2 (en) * 2003-01-09 2004-07-29 Terry Earl Kelley Advanced gas injection method and apparatus liquid hydrocarbon recovery complex

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Title
LOZADA M A ET AL: "Self-Sufficient System for Continuous Gas Lift in a very Harmful Sour Gas Environment", SPE INTERNATIONAL PETROLEUM CONFERENCE AND EXHIBITION, VILLAHERMOSA, MEXICO, 10-12 FEBRUARY 2002,, no. SPE-74414, 10 February 2002 (2002-02-10), pages 12pp, XP007909532 *
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103429696A (zh) * 2010-12-29 2013-12-04 国际壳牌研究有限公司 从含有原油的地层中强化烃采收的方法和组合物
WO2017140629A1 (en) * 2016-02-16 2017-08-24 Shell Internationale Research Maatschappij B.V. System and method of enhanced oil recovery combined with a gas lift
CN114427429A (zh) * 2020-09-21 2022-05-03 中国石油化工股份有限公司 一种油井硫化氢井底处理的装置及方法
CN114991723A (zh) * 2022-06-16 2022-09-02 西南石油大学 一种基于石油天然气开采的气举系统

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