Mechanistic Simulation of Residual Oil Saturation in Viscoelastic Polymer Floods
- Mohammad Lotfollahi (The University of Texas at Austin) | Heesong Koh (The University of Texas at Austin) | Zhitao Li (The University of Texas at Austin) | Mojdeh Delshad (The University of Texas at Austin) | Gary A. Pope (The University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE EOR Conference at Oil and Gas West Asia, 21-23 March, Muscat, Oman
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 5.5 Reservoir Simulation, 5.7 Reserves Evaluation, 0.2 Wellbore Design, 5.3.6 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 1.2.3 Rock properties, 5.4 Enhanced Recovery, 4.3.4 Scale, 5.4 Enhanced Recovery, 5.3.4 Reduction of Residual Oil Saturation, 5.7.2 Recovery Factors, 5 Reservoir Desciption & Dynamics
- Deborah number, viscoelastic polymer, HPAM, residual oil saturation, polymer flood
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Polymer flooding is one of the most widely used enhanced oil recovery methods due to its good performance in numerous large commercial field projects and its relative simplicity and low cost compared to most other enhance oil recovery methods. The main mechanism is considered to be improved sweep efficiency, but numerous studies have also reported lower residual oil saturation to polymer than to water. Because the results depend on many variables such as the initial oil saturation, rock characteristics and polymer characteristics, such experiments must be performed at reservoir conditions and at controlled capillary numbers and so forth to measure the reduction that applies to field polymer floods. Furthermore, a mechanistic model is needed to scale up the laboratory coreflood results to the field.
We implemented and tested the new model for the residual oil saturation in a mechanistic numerical reservoir simulator. The simulation model was used to match the oil recovery and pressure drop of both secondary and tertiary polymer flood experiments. The results showed a strong correlation between the remaining oil saturation and the Deborah number.
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Delshad, M., Kim, D. H., Magbagbeola, O. A., Huh, C.Pope, G. A., Tarahhom, F. 2008. Mechanistic Interpretation and Utilization of Viscoelastic Behavior of Polymer Solutions for Improved Polymer- Flood Efficiency. Paper SPE 113620, presented at the SPE Symposium on Improved Oil Recovery, Tulsa, Oklahoma. 20-23 April.
Wang, D., Xia, H., Liu, Z., Yang, Q. 2001. Study of the Mechanism of Polymer Solution With ViscoElastic Behavior Increasing Microscopic Oil Displacement Efficiency and the Forming of Steady "Oil Thread" Flow Channels. Paper SPE 68723 presented at SPE Asia Pacific Oil and Gas Conference and Exhibition, Jakarta, Indonesia. 17-19 April.