Investigation of Wettability Alteration and Oil-Recovery Improvement by Low-Salinity Water in Sandstone Rock
- Ramez A. Nasralla (Texas A&M University) | Mohammed A. Bataweel (Texas A&M University) | Hisham A. Nasr-El-Din (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- March 2013
- Document Type
- Journal Paper
- 144 - 154
- 2013. Society of Petroleum Engineers
- 5.4.1 Waterflooding, 6.5.2 Water use, produced water discharge and disposal
- 18 in the last 30 days
- 1,542 since 2007
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Optimization of any oil-recovery process is based on understanding of the recovery mechanisms, whereas the underlying mechanisms of improving oil recovery by low-salinity-water injection are still debated. Wettability alteration is one of the mechanisms suggested to be the primary mechanism of low-salinity water. Therefore, wettability alteration by low-salinity water in sandstone reservoirs is examined by using the contact-angle technique. The effect of changing ionic strength on the electrokinetic charges is investigated by use of the zeta-potential technique to explain the causes of wettability alteration by low-salinity water. Moreover, coreflood experiments were performed in order to correlate between the wettability alteration and oil-recovery improvement caused by low-salinity water. Mica sheets were used for the contact-angle measurements to represent sandstone rock. The effect of water salinity on wettability was studied by using synthetic water over a wide range of salinities (from 0 to 174 000 mg/L), with two different crude oils at different conditions of pressure and temperature. Zeta-potential tests were conducted to measure the electrokinetic charges for combinations of each of the two crude oils or Berea sandstone and different brines. Berea sandstone cores were used for waterflooding experiments by injecting the same brines tested in the wettability measurements. Low-salinity water showed lower contact angles compared with high-salinity water for the two types of crude oil, which demonstrates the ability of low-salinity water to alter the rock wettability to more water-wet. In addition, low-salinity water made the surface charges at rock/brine and oil/brine interfaces strongly negative. As a result, the repulsive forces between rock and oil surfaces increase, which leads to expansion of the double-layer and, consequently, wettability alteration and oil-recovery improvement as confirmed by coreflood experiments.
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Alotaibi, M.B., Nasralla, R.A., and Nasr-El-Din, H.A.2011. Wettability Studies Using Low-Salinity Water in Sandstone Reservoirs.SPE Res Eval & Eng 14 (6): 713-725. SPE-149942-PA. http://dx.doi.org/10.2118/149942-PA.
Anderson, W.G. 1986. Wettability Literature Survey—Part 1:Rock/Oil/Brine Interactions and the Effects of Core Handling on Wettability.J Pet Technol 38 (10): 1125-1144. SPE-13932-PA. http://dx.doi.org/10.2118/13932-PA.
Berg, S., Cense, A.W., Jansen, E. et al. 2009. DirectExperimental Evidence of Wettability Modification by Low Salinity. Presented atthe 23rd International Symposium of the Society of Core Analysts, Noordwijk aanZee, The Netherlands, 27-30 September. SCA 2009-12.
Bernard, G. 1967. Effect of Floodwater Salinity on Recovery OfOil from Cores Containing Clays. Presented at the SPE California RegionalMeeting, Los Angeles, California, USA, 26-27 October. SPE-1725-MS. http://dx.doi.org/10.2118/1725-MS.
Buckley, J.S., Takamura, K., and Morrow, N.R. 1989.Influence of Electric Surface Charges on the Wetting Properties of Crude Oils.SPE Res Eng 4 (3): 332-340. SPE-16964-PA. http://dx.doi.org/10.2118/16964-PA.
Buckley, J.S., Bousseau, C., and Liu, Y. 1996. WettingAlteration by Brine and Crude Oil: From Contact Angles to Cores. SPE J. 1 (3): 341-350. SPE-30765-PA. http://dx.doi.org/10.2118/30765-PA.
Craig, F.F. Jr. 1971. The Reservoir Engineering Aspects ofWaterflooding, Vol. 3, 29-77. Richardson, Texas: Monograph Series, SPE.
Drummond, C. and Israelachvili, J. 2002. Surface forces andwettability. J. Pet. Sci. Eng. 33 (1-3): 123-133. http://dx.doi.org/http://dx.doi.org/10.1016/S0920-4105(01)00180-2.
Drummond, C. and Israelachvili, J. 2004. Fundamental studies ofcrude oil-surface water interactions and its relationship to reservoirwettability. J. Pet. Sci. Eng. 45 (1-2): 61-81. http://dx.doi.org/http://dx.doi.org/10.1016/j.petrol.2004.04.007.
Dubey, S.T. and Doe, P.H. 1993. Base Number and WettingProperties of Crude Oil. SPE Res Eval & Eng 8 (3):195-200. SPE-22598-PA. http://dx.doi.org/10.2118/22598-PA.
Farooq, U., Tweheyo, M.T., Sjöblom, J. et al. 2011.Surface Characterization of Model, Outcrop, and Reservoir Samples in LowSalinity Aqueous Solutions. J. Dispersion Sci. Technol. 32(4): 519-531. http://dx.doi.org/10.1080/01932691003756936.
Fogden, A. and Lebedeva, E.V. 2011. Changes in WettabilityState Due to Waterflooding. Presented at the International Symposium of theSociety of Core Analysts, Austin, Texas, USA, 18-21 September. SCA2011-15.
Hirasaki, G.J. 1991. Wettability: Fundamentals and SurfaceForces. SPE Form Eval 6 (2): 217-226. SPE-17367-PA. http://dx.doi.org/10.2118/17367-PA.
Hussain, S.A., Demirci, S., and Özbayoglu, G. 1996. ZetaPotential Measurements on Three Clays from Turkey and Effects of Clays on CoalFlotation. J. Colloid Interface Sci. 184 (2): 535-541. http://dx.doi.org/10.1006/jcis.1996.0649.
Jadhunandan, P.P. and Morrow, N.R. 1991. Spontaneous imbibitionof water by crude oil/brine/rock systems. In Situ 15 (4):319-345.
Kia, S.F., Fogler, H.S., Reed, M.G. et al. 1987. Effect of SaltComposition on Clay Release in Berea Sandstones. SPE Prod Eng 2 (4): 277-283. SPE-15318-PA. http://dx.doi.org/10.2118/15318-PA.
Lager, A., Webb, K.J., Black, C.J.J. et al. 2006. Low salinityoil recovery—An experimental investigation. Presented at the InternationalSymposium of Core Analysts, Trondhiem, Norway, 12-16 September. PaperSCA2006-36.
Lager, A., Webb, K.J., Collins, I.R. et al. 2008. LoSal™Enhanced Oil Recovery: Evidence of Enhanced Oil Recovery at the ReservoirScale. Presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, 19-23April. SPE 113976. http://dx.doi.org/10.2118/113976-MS.
Lebedeva, E.V., Fogden, A., Senden, T.J. et al. 2010. KaoliniteWettability - The Effect of Salinity, pH and Calcium. Presented at theInternational Symposium of the Society of Core Analysts, Halifax, Nova Scotia,Canada, 4-7 October. SCA2010-11.
Ligthelm, D.J., Gronsveld, J., Hofman, J. et al. 2009. NovelWaterflooding Strategy by Manipulation of Injection Brine Composition.Presented at the EUROPEC/EAGE Conference and Exhibition, Amsterdam, 8-11 June.SPE-119835-MS. http://dx.doi.org/10.2118/119835-MS.
Liu, L. and Buckley, J.S. 1999. Alteration of wetting of micasurfaces. J. Pet. Sci. Eng. 24 (2-4): 75-83. http://dx.doi.org/10.1016/s0920-4105(99)00050-9.
Menezes, J.L., Yan, J., and Sharma, M.M. 1989. TheMechanism of Wettability Alteration Due to Surfactants in Oil-Based Muds.Presented at the SPE International Symposium on Oilfield Chemistry, Houston,8-10 February. SPE-18460-MS. http://dx.doi.org/10.2118/18460-MS.
Morrow, N.R., Tang, G.-Q., Valat, M. et al. 1998. Prospects ofimproved oil recovery related to wettability and brine composition. J. Pet.Sci. Eng. 20 (3-4): 267-276. http://dx.doi.org/10.1016/S0920-4105(98)00030-8.
Pu, H., Xie, X., Yin, P. et al. 2010. Low SalinityWaterflooding and Mineral Dissolution. Presented at the SPE Annual TechnicalConference and Exhibition, Florence, Italy, 19-22 September. SPE-134042-MS. http://dx.doi.org/10.2118/134042-MS.
Rajayi, M. and Kantzas, A. 2011. Effect of Temperature andPressure on Contact Angle and Interfacial Tension of Quartz/Water/BitumenSystems. J Can Pet Technol 50 (6): 61-67. SPE-148631-PA. http://dx.doi.org/10.2118/148631-PA.
Robertson, E.P. 2007. Low-Salinity Waterflooding to Improve OilRecovery—Historical Field Evidence. Presented at the SPE Annual TechnicalConference and Exhibition, Anaheim, California, USA, 11-14 November.SPE-109965-MS. http://dx.doi.org/10.2118/109965-MS.
Seccombe, J., Lager, A., Jerauld, G. et al. 2010.Demonstration of Low-Salinity EOR at Interwell Scale, Endicott Field, Alaska.Presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, 24-28 April.SPE-129692-MS.
Takamura, K. and Chow, R.S. 1985. The electric propertiesof the bitumen/water interface Part II. Application of the ionizablesurface-group model. Colloids Surf. 15: 35-48. http://dx.doi.org/10.1016/0166-6622(85)80053-6.
Tang, G.-Q. and Morrow, N.R. 1999. Influence of brinecomposition and fines migration on crude oil/brine/rock interactions and oilrecovery. J. Pet. Sci. Eng. 24 (2-4): 99-111. http://dx.doi.org/10.1016/S0920-4105(99)00034-0.
Wang, W. and Gupta, A. 1995. Investigation of the Effect ofTemperature and Pressure on Wettability Using Modified Pendent Drop Method.Presented at the SPE Annual Technical Conference and Exhibition, Dallas, 22-25October. SPE-30544-MS. http://dx.doi.org/10.2118/30544-MS.
Zhang, D. 2006. Surfactant-Enhanced Oil recovery Process for A Fractured,Oil-Wet Carbonate Reservoir. PhD dissertation, Rice University, Houston,Texas.
Zhang, Y., Xie, X., and Morrow, N.R. 2007. Waterfloodperformance by injection of brine with different salinity for reservoir cores.Presented at the SPE Annual Technical Conference and Exhibition, Anaheim,California, USA, 11-14 November. SPE-109849-MS. http://dx.doi.org/10.2118/109849-MS.