Effects of Wormhole Configurations on Performance of Cyclic Solvent Injection in Heavy Oil Systems
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In this study, the effect of three different wormhole configurations: single-linear, single-branched, and double-branched wormholes on the performance of cyclic solvent injection was investigated through extensive experimentation. A 2D rectangular sand-packed model with porosity and permeability of 31.96–33.2% and 4.3–10.4 d and heavy oil sample of viscosity 4440 mPa.s at T = 21 °C were used to represent a typical thin post-cold heavy oil production, respectively, with sands (post-CHOPS) reservoir. First, a series of cyclic solvent (15% C3H8–85% CO2) injection tests were carried out under operating injection pressure of Pinj = 730 kPa. After termination of each test, the residual oil saturation distributions on the top and middle layers of the sand-packed model were determined through additional tests. Thereafter, the double-branched wormhole network was subjected to another cyclic injection of 15% C3H8–85% CO2 to investigate the effect of a lengthier soaking time. The experimental results showed an improved heavy oil recovery factor (RF) (attributed to foamy oil phenomenon) as the number of wormhole branch increases. Therefore, better performance of CSI process was ascribed to larger wormhole coverage in the sand-packed model. The residual oil saturation profile also confirms this as larger wormhole coverage is required to produce oil during CSI process. However, lengthier soaking time in the presence of double-branched wormhole improved the incremental production of the early cycles, and increased the ultimate oil RF from 43.46 to 47.06% original oil in place. The findings of this paper further iterate the role of wormhole multi-branching systems in post-CHOPS reservoirs on the application of CSI schemes as a follow-up technique.
KeywordsCSI Foamy oil Heavy oil Multi-branched wormhole Residual oil saturation
The “Faculty of Graduate Studies and Research (FGSR) of University of Regina” and also “Petroleum Technology Research Center (PTRC)” are acknowledged for providing financial support to carry out this study.
- Ahmodloo, F., Asghari, K., Henni, A., & Freitag, N. P. (2011). Experimental results and analytical modeling of solvent leaching gravity drainage phenomenon in heavy oil reservoirs. In SPE Annual Technical Conference and Exhibition, Denver.Google Scholar
- Chen, S., Lines, L., & Daley, P. F. (2004). Do wormholes play a role in heavy oil cold production ? In 2004 CSEG National Convention. https://doi.org/10.1190/1.1851142.
- Mayo, L. (1996). Seismic monitoring of foamy heavy oil, Lloydminster, Western Canada. In SEG Technical Program Expanded Abstracts 1996 (pp. 2091–2094).Google Scholar
- Mohammadpoor, M., Saskatchewan, R., & Volodin, A. (2014). Experimental, Numerical, and Soft Computing-Based Analysis of the Vapex Process in Heavy Oil Systems. Regina: University of Regina Faculty of Graduate Studies and Research Supervisory and Examining Committee.Google Scholar
- Qazvini Firouz, A., & Torabi, F. (2012). Feasibility Study of Solvent-Based Huff-n-Puff Method (Cyclic Solvent Injection) To Enhance Heavy Oil Recovery. In SPE Heavy Oil Conference Canada. https://doi.org/10.2118/157853-MS.
- Rangriz Shokri, A., & Babadagli, T. (2016). Laboratory measurements and numerical simulation of cyclic solvent stimulation with a thermally aided solvent retrieval phase in the presence of wormholes after cold heavy oil production with sand. Energy & Fuels, 30(11), 9181–9192. https://doi.org/10.1021/acs.energyfuels.6b01864.CrossRefGoogle Scholar
- Sawatzky, R. P., Lillico, D. A., London, M. J., Tremblay, B. R., & Coates, R. M. (2002). Tracking Cold Production Footprints. In Canadian International Petroleum Conference, June 11–13. https://doi.org/10.2118/2002-086.
- Soh, Y., Rangriz-Shokri, A., & Babadagli, T. (2018). Optimization of methane use in cyclic solvent injection for heavy-oil recovery after primary production through experimental and numerical studies. Fuel, 214(November 2017), 457–470. https://doi.org/10.1016/j.fuel.2017.11.064.CrossRefGoogle Scholar
- Squires, A. (1993). Inter-well tracer results and gel blocking program. In Tenth Annual Heavy oil Sands technical Symposium. Calgary.Google Scholar
- Yeung, K. C. (1995). Cold flow production of crude bitumen at the burnt lake project. In UNITAR international conference on heavy crude and tar sands on fueling for a clean and safe environment. Houston.Google Scholar
- Zeng, F., Knorr, K. D., & Wilton, R. (2008). Post-cold production solvent vapor extraction (SVX) Process performance evaluation by numerical simulation. In Canadian International Petroleum Conference.Google Scholar