The Effect of Brine Concentration on Asphaltene Stability
- A. Birkan Demir (West Virginia University) | Ilkin H. Bilgesu (West Virginia University) | Berna Hascakir (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 26-28 September, Dubai, UAE
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 1.8 Formation Damage, 5 Reservoir Desciption & Dynamics, 5.3.1 Flow in Porous Media, 5.3 Reservoir Fluid Dynamics, 1.8 Formation Damage, 4.3.3 Aspaltenes
- Asphaltene Stability, Brine Type and Concentration, Clay
- 1 in the last 30 days
- 198 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 28.00|
The stability of asphaltenes is a critical parameter which may affect the flow in porous media significantly. This study investigates the change in the stability of asphaltenes after the interaction of asphaltenes originated from five different reservoirs with reservoir components? namely sand, clay, water, and brine. Asphaltenes are polar like water and brine. Hence, the initial lab-scale sensitivity studies were carried out first with asphaltene-water and asphaltene-brine systems. Then, the impact of porous medium has been investigated on asphaltene stability? asphaltenes are mixed with either sand or sand+clay mixture and then exposed to water or brine. Since, both sand and clay show water-wet behavior, the effect of water-wet rock surface on asphaltene stability has been aimed to understand. Moreover, different brine types and concentrations on asphaltene stability have been tested. A divalent and a monovalent salts were used to prepare brine solutions at 2%, 4%, 6%, and 8% concentrations. All laboratory tests were achieved under optical microscope and the interaction has been examined overtime. Our experimental results suggest that asphaltenes from all five crude oil samples are dispersed in water and they aligned themselves within water due to polar nature of asphaltenes and water. In asphaltene-brine systems, the monovalent salt (NaCl) interacts more with asphaltenes than divalent salt (CaCl2). This is due to higher water uptake capacity of CaCl2 than NaCl. The microscopic images revealed that a water layer is formed around CaCl2 inhibits the direct interaction of asphaltene-CaCl2. This behavior is enhanced within the porous media; salt crystals form bridges between the sand grains, clay and asphaltenes contribute to the formation of those bridges. The impact of brine has been observed more significantly at high concentration of the brine solutions. The asphaltenes-brine interaction also shows variations among different asphaltenes. Thus, all asphaltene samples have been analyzed for their elemental compositions to check if cation exchange is possible between the salts and asphaltenes. These experiments revealed that for the asphaltenes rich in calcium and sodium content, their interaction with brine is greater than for the asphaltenes poor in calcium and sodium content. Moreover, this interaction contributes to the formation of bigger asphaltene clusters which decreases the asphaltene stability and promotes more asphaltene precipitation. This study provides some general trends observed in asphaltene-water and asphaltene-brine systems and explains the reasons why some outliers do not fit the trends by examining the differences in the chemical composition of asphaltenes. Hence, this study enriches our knowledge towards asphaltene behavior in porous media.
|File Size||24 MB||Number of Pages||11|
Akbarzadeh, K., Alboudwarej, H., Svrcek, W.Y.. 2005. A generalized regular solution model for asphaltene precipitation from n-alkane diluted heavy oils and bitumens. Fluid Phase Equilibria 232 (1–2): 159-70. doi: http://dx.doi.org/10.1016/j.fluid.2005.03.029.
Benedicto, A., Missana, T. and Fernandez, A.M. 2014. Interlayer Collapse Affects on Cesium Adsorption Onto Illite. Environmental science & technology 48 (9): 4909-15. doi: 10.1021/es5003346.
Carnahan, N.F., Salager, J., AntÃ3n, R.. 1999. Properties of Resins Extracted from Boscan Crude Oil and Their Effect on the Stability of Asphaltenes in Boscan and Hamaca Crude Oils. Energy Fuels 13 (2): 309-14. doi: 10.1021/ef980218v
Gonzalez, V., Jones, M. and Taylor, S.E. 2016. Spinâ€"Spin Relaxation Time Investigation of Oil/Brine/Sand Systems. Kinetics, Effects of Salinity, and Implications for Wettability and Bitumen Recovery. Energy Fuels 30 (2): 844-53. doi: 10.1021/acs.energyfuels.5b02352.
Hu, C., Sabio, J.C., Yen, A.. 2015. Role of Water on the Precipitation and Deposition of Asphaltenes in Packed-Bed Microreactors. Industrial & Engineering Chemistry Research 54 (16): 4103-12. doi: 10.1021/ie5038775.
Kabay, N., Ipek, Ö, Kahveci, H.. 2006. Effect of salt combination on separation of monovalent and divalent salts by electrodialysis. Desalination 198 (1–3): 84-91. doi: http://dx.doi.org/10.1016/j.desal.2006.09.013.
Kar, T., Jie, Y. Jun, Ovalles, C.. 2015. The Impact of Asphaltene Precipitation and Clay Migration on Wettability Alteration for Steam Assisted Gravity Drainage (SAGD) and Expanding Solvent-SAGD (ES-SAGD). Presented at SPE Canada Heavy Oil Technical Conference, Calgary, Alberta, Canada. SPE-174439-MS. http://dx.doi.org/10.2118/174439-MS.Kokal, S.L., Sayegh, S.G. 1995. Asphaltenes: The Cholesterol of Petroleum. Presented at SPE Middle East Oil Show, Bahrain, 11-14 March. SPE-29787-MS. http://dx.doi.org/10.2118/29787-MS.
Leontaritis, K.J. 1989. Asphaltene Deposition: A Comprehensive Description of Problem Manifestations and Modeling Approaches. Presented at SPE Production Operations Symposium, Oklahoma City, Oklahoma. SPE-18892-MS. http://dx.doi.org/10.2118/18892-MS.
Meyer, R.F., Attanasi, E.D. and Freeman, P.A. 2007. Heavy Oil and Natural Bitumen Resources in Geological Basins of the World: U.S. Geological Survey Open-File Report 2007-1084. doi: http://pubs.usgs.giv/of/2007/1084/.
Mukhametshina, A., Kar, T., Hascakir, B. 2015. Asphaltene Precipitation during Bitumen Extraction with Expanding Solvent Steam Assisted Gravity Drainage (ES-SAGD): Effects on Pore-Scale Displacement. SPE Journal. SPE-170013-PA. http://dx.doi.org/10.2118/170013-PA.
Reinoso-Maset, E. and Ly, J. 2014. Study of Major Ions Sorption Equilibria To Characterize the Ion Exchange Properties of Kaolinite. Journal of Chemical & Engineering Data 59 (12): 4000-9. doi: 10.1021/je5005438.
Tang, G.Q. and Morrow, N.R. 1997. Salinity, Temperature, Oil Composition, and Oil Recovery by Waterflooding. doi: 10.2118/36680-PA.
Tharanivasan, A.K., Yarranton, H.W. and Taylor, S.D. 2012. Asphaltene Precipitation from Crude Oils in the Presence of Emulsified Water. Energy Fuels 26 (11): 6869-75. doi: 10.1021/ef301200v.