1887

Abstract

Summary

Miscible displacement of oil by CO2 injection is one of the most successful enhanced oil recovery (EOR) processes and has been widely implemented in fields around the world since the early 1980s. The advantage of CO2 compared to the other gases is its high extraction power and dissolution rate. As a result, CO2 can develop the miscibility front in the light and medium gravity crude oils at relatively low pressures.

A comprehensive set of experimental studies were conducted using bottomhole oil samples (BHS) and stock tank oil to investigate the viability of miscible CO2 flood in a North African field. The objectives of the study were:

  • To measure physical and thermodynamic properties of the oil and CO2 mixtures
  • To investigate minimum miscibility pressure and minimum miscibility concentration.

This paper explains the technical approach that was followed to combine laboratory experiments and simulation studies in order to improve quality of the data and tuning of the equation of state. The study started with standard PVT tests (constant composition expansion, differential vaporization, separator tests and viscosity tests) to measure the physical and thermodynamic properties of the reservoir oil. To characterize CO2/oil interaction the study continued with swelling tests. Miscibility of oil and CO2 at reservoir conditions was investigated by visual techniques and the results were verified by slim-tube analysis.

The data from PVT analysis were used to develop three equations of state (EOS) for the reservoir oil from very early stages of the study. The EOS model was then used to design the CO2/oil interaction experiments and was updated once tests were completed.

Simulation of the slim-tube tests were done in order to: (1) verify that simulated FC and MC MMP lies in the range of measured values in laboratory; (2) select the best EOS for conceptual simulation model; (3) calibrate conceptual model for slim-tube test; and (4) understand combined condensing/vaporizing mechanism for a given oil and estimate thermodynamic residual oil at different pressures. Detailed explanations of vaporizing and condensing drives were given in order to allocate them in combined drive along slim-tube.

For conceptual model preparation special attention was given to establish reference interfacial tension and immiscible base case. Further improvements for experimental set up were suggested based on the simulation.

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2017-04-24
2020-09-28
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References

  1. A.A.Zick
    A Combined Condensing/Vaporizing Mechanism in the Displacement of Oil by Enriched Gases [Report]. - SPE 15493 : Society of Petroleum Engineers, 1986.
    [Google Scholar]
  2. AlkanH., LuanG., Junker, H., Pusch, G.
    Experimental-Numerical Investigation of Polymer – CO2 and Steamflood as a Tertiary Oil Recovery Method in a German Field Project [Book Section]. -[s.l.] : BMBF 26802A, 1993.
    [Google Scholar]
  3. AlstonR.B., KokolisG.P. and JamesC.F.
    CO2 Minimum Miscibility Pressure: A Correlation for Impure CO2 Streams and Live Oil Systems [Report]. - [s.l.] : SPEJ, April, 1985. - pp. 268–274.
    [Google Scholar]
  4. CockinA.P. [et al.]
    Analysis of a Single-Well Chemical Tracer Test To Measure the Residual Oil Saturation to a Hydrocarbon Miscible Gas Flood at Prudhoe Bay [Report]. - SPE 68051, Presented at the 1998 SPE Annual Technical Conference and Exhibition, New Orleans, : Society of Petroleum Engineers, 2000.
    [Google Scholar]
  5. CronquistD.
    Carbon Dioxide Miscibility with Light Reservoir Oils [Report]. - Tulsa : paper presented at Fourth Annual DOE EOR Symposium, 29–31, 1978.
    [Google Scholar]
  6. DaneshAli
    PVT and Phase Behaviour of Petroleum Reservoir Fluids, 3th.ed [Book]. - [s.l.] : Elsevier Science, 2003.
    [Google Scholar]
  7. FredI.StalkupJr.
    Miscible Displacement [Book]. - New York : Society of Petroleum Engineers of AIME, 1984.
    [Google Scholar]
  8. GlasoD.S.
    , Generalized Miscibility Pressure Correlation [Report]. - [s.l.] : Soc. Pet. Eng. J., 1985. -pp. 927–934.
    [Google Scholar]
  9. JensenF. and MichelsenM.L.
    Calculation of First Contact and Multiple Contact Minimum Miscibility Pressures [Report]. - [s.l.] : In Situ, 14(1), Page 1–17, 1990.
    [Google Scholar]
  10. JohnsonJ.P. and PollinJ.S.
    Measurement and Correlation of CO2 Minimum Miscibility Pressure [Report]. - Tulsa, April 5–8 : paper presented at the SPE DOE Enhanced Oil Recovery Symposium, 1981.
    [Google Scholar]
  11. KhazamM.M. [et al.]
    Dynamic Validation of Phase Behaviour Models for Reservoir Studies of Gas Injection Schemes [Report]. - SPE 28627 : This paper wes prepared for presentation at the SPE 69th Annual Technical Conference and Exhibition held in New Orleans, LA, U.S.A., 1994. - pp. 201–216.
    [Google Scholar]
  12. KossackC.A. and HagenS
    The Simulation of Phase Behaviour and Slim Tube Displacements with Equation-of-State [Report]. - paper SPE 14151 presented at the 60th SPE Annual Technical Conference and Exhibition, Las Vegas, NV : [s.n.], 1985.
    [Google Scholar]
  13. MansooriJ., HaagG.L. and BergmanD.F.
    An Experimental and Modelling Study of the Miscibility Relationship and Displacement Behaviour for a Rich-Gas/Crude-Oil System [Report]. -paper SPE 20521 presented at 65th Annual Technical Conference and Exhibition of the SPE, New Orleans, LA, : [s.n.], 1990.
    [Google Scholar]
  14. MetcalfeR.S. and YarboroughL.
    The Effect of Phase Equilibria on the CO2 Displacement Mechanism [Report]. - SPE-7061-PA : Society of Petroleum Engineers of AIME, 1979.
    [Google Scholar]
  15. MongerT.G.
    The Impact of Oil Aromaticity on CO2 Flooding [Book Section]. - 1985.
    [Google Scholar]
  16. Newley T.M.Merill, R.C.Pseudocomponent Selection
    for Compositional Simulation [Book Section]. - [s.l.] : SPERE, 1991.
  17. OrrF.M. SilvaM.K.
    Effect of Oil Composition on Minimum Miscibililty Pressure [Journal]. - [s.l.] : SPERE, 1987. - Vols. 479–491.
    [Google Scholar]
  18. OrrF.M.Jr
    Theory of Gas Injection Processes, Copenhagen [Book Section]. - [s.l.] : Tie-line Publications, 2007.
    [Google Scholar]
  19. PedersenK.S., FredenslundAa. and ThomassenP.
    Properties of Oils and Natural Gases [Book]. -Houston : Gulf Publishing Company, 1989.
    [Google Scholar]
  20. StalkupF.I.
    , Displacement Behavior of the Condening/Vaporizing Gas Drive Process [Report]. -SPE 16715, Annual Technical Conference and Exhibition, Dallas, TX. : [s.n.], 1987.
    [Google Scholar]
  21. Whitson CurtisH. and Brulé MichaelR.
    Phase Behavior, Monograph SPE [Book]. - [s.l.] : Society of Petroleum Engineers, 2000. - 683; Trans., AIME, 275.
    [Google Scholar]
  22. YelligW.F and MetcalfeR.S
    Determination and Prediction of CO2 Minimum Miscibility Pressures [Report]. - [s.l.] : Pet. Tech, 1980. - pp. 160–68.
    [Google Scholar]
  23. YuanH. [et al.]
    Improved MMP Correlations for CO2 Floods Using Anaytical Gasflooding Theory [Report]. - [s.l.] : SPE RE, 2005. - pp. 418–425.
    [Google Scholar]
  24. ZuoY. [et al.]
    A study on the minimum miscibility pressure for miscible flooding systems [Report]. - [s.l.]: Journal of Petroleum Science and Engineering, 1993. - pp. 315–328.
    [Google Scholar]
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