Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
Fracture reservoirs contain most of the oil reserves of the Middle East. Such reservoirs are poorly understood and recovery from fractured reservoirs is typically lower than those from conventional reservoirs. Many efforts have been made to enhance the recovery and production potential of these reservoirs. Fractured reservoirs with high matrix porosity and low matrix permeability need a secondary or EOR technique to achieve the maximum production. One of the effective EOR approaches is surfactant flooding, which reduces interfacial tension and alters wettability. Due to the complexity and uncertainty associated with such reservoirs, implementing a simulation and numerical analysis is primarily necessary to evaluate the effect of key engineering parameters on ultimate reservoir performance. This study assesses and provides a good insight into surfactant injection into fractured reservoirs using ECLIPSE software as a numerical simulator. The influences of fracture-matrix permeability ratio, initial water saturation, and the number of grids on reservoir performance were assessed and a sensitivity analysis was carried out. This study takes surfactant-related phenomena such as adsorption, surface tension reduction, and wettability alteration into account. The simulation results demonstrate that fracture-matrix permeability ratio is an important screening quantity for the selection of surfactant flooding as an EOR agent and that uncertainty in the initial water saturation of matrix has a great influence on the simulation outputs.
Adibhatla, B., Mohanty, K., Berger, P., and Lee, C., Effect of Surfactants on Wettability of Near-wellbore Regions of Gas Reservoirs, Journal of Petroleum Science and Engineering, Vol. 52, No. 1, p. 227-236, 2006.
Allan, J. and Sun, S. Q., Controls on Recovery Factor in Fractured Reservoirs: Lessons Learned from 100 Fractured Fields, SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers, 2003.
Babadagli, T., Evaluation of EOR Methods for Heavy Oil Recovery in Naturally Fractured Reservoirs, Journal of Petroleum Science and Engineering, Vol. 37, No. 2, p. 25-37, 2003.
Barenblatt, G. I., The Mathematical Theory of Equilibrium Cracks in Brittle Fracture, Advances in Applied Mechanics, Vol. 7, p. 104-107, 1962.
Delshad, M., Fathi Najafabadi, N., Anderson, G., POPE, G. and Sepehrnoori, K., Modeling Wettability Alteration by Surfactants in Naturally Fractured Reservoirs, SPE Reservoir Evaluation & Engineering, Vol. 12, No. 3, p. 361-370, 2009.
Delshad, M., Najafabadi, N. F., Anderson, G. A., Pope, G. A. and Sepehrnoori, K., Modeling Wettability Alteration in Naturally Fractured Reservoirs, SPE/DOE Symposium on Improved Oil Recovery, Society of Petroleum Engineers, Tulsa, Oklahoma, USA, 2006.
Delshad, M. and Pope, G. A., Comparison of the Three-phase Oil Relative Permeability Models, Transport in Porous Media, Vol. 4, No. 1, p. 59-83, 1989.
Emegwalu, C. C., Enhanced Oil Recovery for Norne Field's E-segment Using Surfactant Flooding, Norwegian University of Science and Technology, Norway, 2010.
Farhadinia, M. A. and Delshad, M., Modeling and Assessment of Wettability Alteration Processes in Fractured Carbonates Using Dual Porosity and Discrete Fracture Approaches, SPE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 2010.
Fathi Najafabadi, N., Modeling Chemical EOR Processes Using IMPEC and Fully IMPLICIT Reservoir Simulators, Ph.D. Thesis, The University of Texas at Austin, USA, 2009.
Goudarzi, A., Modeling Wettability Alteration in Naturally Fractured Carbonate Reservoirs, Ph.D. Thesis, the University of Texas at Austin, USA, 2011.
Kathel, P. and Mohanty, K. K. EOR in Tight Oil Reservoirs through Wettability Alteration, SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, 2013.
Kazemi, H. and Merrill, L., Numerical Simulation of Water Imbibition in Fractured Cores, Journal of Society of Petroleum Engineers , Vol. 16, No. 2, p.175-182, 1979.
Nasr-el-din, H. A., Investigation of Wettability Alteration and Oil Recovery Improvement by Low Salinity Water in Sandstone Rock, Journal of Canadian Petroleum Technology, Vol. 52, No. 2, p. 144-154, 2013.
Rao, D. and Girard, M., A New Technique for Reservoir Wettability Characterization, Journal of Canadian Petroleum Technology, Vol. 35, No. 2, p. 31-39, 1996.
Saidi, A., Simulation of Naturally Fractured Reservoirs, SPE Symposium on Reservoir Simulation, San Francisco, USA, 16-18 November, 1983.
Schmid, K. S., Mathematical Analysis, Scaling and Simulation of Flow and Transport during Immiscible Two-phase Flow, Ph.D. Thesis, Heriot-Watt University, Scotlan, 2012.
Shah, D. O., Improved Oil Recovery By Surfactant and Polymer Flooding: p. 32, Elsevier, 2012.
Uleberg, K. and Kleppe, J., Dual Porosity, Dual Permeability Formulation for Fractured Reservoir Simulation, Norwegian University of Science and Technology, Trondheim RUTH Seminar, Stavanger, 1996.
Warren, J. and Root, P. J., The Behavior of Naturally Fractured Reservoirs, Journal of Society of Petroleum Engineers, Vol. 3, No. 3, p. 245-253, 1963.