Identification and Evaluation of High-Performance EOR Surfactants
- David Levitt (University of Texas at Austin) | Adam Jackson (Chevron Corp.) | Christopher Heinson (Oxy) | Larry N. Britton (University of Texas at Austin) | Taimur Malik (Chevron Corp.) | Varadarajan Dwarakanath (Chevron Corp.) | Gary Arnold Pope (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- April 2009
- Document Type
- Journal Paper
- 243 - 253
- 2009. Society of Petroleum Engineers
- 6 in the last 30 days
- 3,703 since 2007
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We report results for a number of promising enhanced-oil-recovery (EOR) surfactants based upon a fast, low-cost laboratory screening process that is highly effective in selecting the best surfactants to use with different crude oils. Initial selection of surfactants is based upon desirable surfactant structure. Phase-behavior screening helps to quickly identify favorable surfactant formulations. Salinity scans are conducted to observe equilibration times, microemulsion viscosity, oil and water-solubilization ratios, and interfacial tension (IFT). Cosurfactants and cosolvents are included to minimize gels, liquid crystals, and macroemulsions and to promote rapid equilibration to low-viscosity microemulsions. Branched alcohol propoxy sulfates (APS), internal olefin sulfonates, and branched alpha olefin sulfonates (AOS) have been identified as good EOR surfactants using this screening process. These surfactants are available at a low cost and are compatible with both polymers and alkali, such as sodium carbonate and, thus, are good candidates for both surfactant-polymer and alkali-surfactant-polymer EOR processes. One of the best formulations was tested in both sandstone and dolomite cores and found to give excellent oil recovery and low surfactant retention with a west Texas (WT) crude oil.
Recent advances, including the development of new synthetic surfactants and increased understanding of the structure/performance relationship of surfactants, have made it possible to rapidly identify promising high-performance surfactants for EOR. This process involves laboratory screening using knowledge of the molecular structure and cost of the surfactants as well as pertinent reservoir-specific information (i.e., temperature, salinity, and crude-oil properties).
This paper describes a process for identifying and evaluating potential EOR surfactants. The surfactant selection process starts with the screening of surfactants by phase-behavior experiments and progresses to corefloods with formulations that may incorporate cosurfactants, cosolvents, alkali, polymers, and electrolytes. We illustrate the application of this approach to the selection of a surfactant formulation for use in both a sandstone outcrop and a WT dolomite reservoir, but focus mostly on the dolomite application because very few studies have been reported for carbonate (Adams and Schievelbein 1987) or dolomite reservoirs. These laboratory data were used in a parallel simulation study of the same reservoir and are described by Anderson et al. (1976) in a companion paper.
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Adams, W.T. and Schievelbein, V.H. 1987. Surfactant Flooding CarbonateReservoirs. SPE Res Eng 2 (4): 619-626. SPE-12686-PA.DOI: 10.2118/12686-PA.
Anderson, G.A., Delshad, M., King, C.B., Mohammadi, H., and Pope, G.A. 2006.Optimization of Chemical Floodingin a Mixed-Wet Dolomite Reservoir. Paper SPE 100082 presented at theSPE/DOE Symposium on Improved Oil Recovery, Tulsa, 22-26 April. DOI:10.2118/100082-MS.
Aoudia, M., Wade, W.H., and Weerasooriya, V. 1995. Optimum microemulsionsformulated with propoxylated tridecyl alcohol sodium sulfates. J. ofDispersion Science and Technology 16 (2): 115-135.DOI:10.1080/01932699508943664.
Bourrel, M. and Schechter, R.S. 1988. Microemulsions and Related Systems:Formulation, Solvency, and Physical Properties, Vol. 30. New York:Surfactant Science Series, Marcel Dekker.
Healy, R.N., Reed, R.L., and Stenmark, D.K. 1976. Multiphase Microemulsion Systems.SPE J. 16 (3): 147-160; Trans., AIME, 261.SPE-5565-PA. DOI: 10.2118/5565-PA.
Hirasaki, G. and Zhang, D.L. 2004. Surface Chemistry of Oil RecoveryFrom Fractured, Oil-Wet Carbonate Formations. SPE J. 9(2): 151-162. SPE-80989-PA. DOI: 10.2118/88365-PA.
Hirasaki, G.J. and Pope, G.A. 1974. Analysis of Factors InfluencingMobility and Adsorption in the Flow of Polymer Solution Through PorousMedia. SPE J. 14 (4): 337-346. SPE-4026-PA. DOI:10.2118/4026-PA.
Hirasaki, G.J., Miller, C.A., and Pope, G.A. 2006. Surfactant Based EnhancedOil Recovery and Foam Mobility Control. Technical Report, Contract No.DE-FC26-03NT15406, Rice University, Houston, Texas (June 2005).
Huh, C. 1979. Interfacial tensions andsolubilizing ability of a microemulsion phase that coexists with oil andbrine. J. of Colloid and Interface Science 71 (2):408-426. DOI:10.1016/0021-9797(79)90249-2.
Jayanti, S., Britton, L.N., Dwarakanath, V., and Pope, G.A. 2002. Laboratory evaluation ofcustom-designed surfactants to remediate NAPL source zones.Environmental Science and Technology 36 (24): 5491-5497.DOI:10.1021/es020566i.
Levitt, D. 2006. Experimental evaluation of high performance EOR surfactantsfor a dolomite reservoir. MS thesis, University of Texas at Austin, Austin,Texas.
Liu, S., Leslie, D., Yan, W., Puerto, M., Hirasaki, G.J., and Miller, C.A.2008. Favorable Attributes ofAlkali-Surfactant-Polymer Flooding. SPE J. 13 (1):5-16. SPE-99744-PA. DOI: 10.2118/99744-PA.
Nelson, R.C. and Pope, G.A. 1978. Phase Relationships in ChemicalFlooding. SPE J. 18 (5): 325-338; Trans., AIME,265. SPE-6773-PA. DOI: 10.2118/6773-PA.
Pope, G.A., Wang, B., and Tsaur, K. 1979. A Sensitivity Study ofMicellar/Polymer Flooding. SPE J. 19 (6): 357-368.SPE-7079-PA. DOI: 10.2118/7079-PA.
Stegemeier, G.L. 1976. Mechanisms of oil entrapment and mobilization inporous media. Proc., AIChE Symposium on Improved Oil Recovery bySurfactant and Polymer Flooding, Kansas City, Missouri, USA, 12-14 April,55-91.
Winsor, P.A. 1954. Solvent Properties of Amphiphilic Compounds.London: Butterworth's Scientific Publications.
Wu, Y., Shuler, P., Blanco, M., Tang, Y., and Goddard, W.A. 2005. A Study of Branched AlcoholPropoxylate Sulfate Surfactants for Improved Oil Recovery. Paper SPE 95404presented at the SPE Annual Technical Conference and Exhibition, Dallas, 9-12October. DOI: 10.2118/95404-MS.