Experimental and Molecular Insights on Mitigation of Hydrocarbon Sieving in Niobrara Shale by CO2 Huff-n-Puff
- Ziming Zhu (Colorado School of Mines) | Chao Fang (Virginia Polytechnic Institute and State University) | Rui Qiao (Virginia Polytechnic Institute and State University) | Xiaolong Yin (Colorado School of Mines) | Erdal Ozkan (Colorado School of Mines)
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- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 30 September - 2 October, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Hydrocarbon Transport, Niobrara Shale, CO2 Huff-n-Puff, Membrane Sieving
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- 209 since 2007
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In nanoporous rocks, potential size/mobility exclusion and fluid-rock interactions in nano-sized pores and pore throats can turn the rock into a semi-permeable membrane, blocking or hindering the passage of certain molecules while allowing other molecules to pass freely. In this work, we conducted several experiments to investigate whether CO2 can mitigate the sieving effect on the hydrocarbon molecules flowing through Niobrara samples. Molecular dynamics simulations of adsorption equilibrium with and without CO2 were performed to help understand the trends observed in the experiments. The procedure of the experiments includes pumping of liquid binary hydrocarbon mixtures (C10 C17) of known compositions into Niobrara samples, collecting of the effluents from the samples, and analysis of the compositions of the effluents. A specialized experimental setup that uses an in-line filter as a mini-core holder was built for this investigation. Niobrara samples were cored and machined into 0.5-inch diameter and 0.7-inch length mini-cores. Hydrocarbon mixtures were injected into the mini-cores and effluents were collected periodically and analyzed using gas chromatography (GC). After observing the membrane behavior of the mini-cores, CO2 huff-n-puff was performed at 600 psi, a pressure much lower than the miscibility pressure. CO2 was injected from the production side to soak the sample for a period, then the flow of the mixture was resumed and effluents were analyzed using GC. Experimental results show that CO2 huff-n-puff in several experiments noticeably mitigated the sieving of heavier component (C17). The observed increase in the fraction of C17 in the produced fluid can be either temporary or lasting. In most experiments, temporary increases in flow rates were also observed. Molecular dynamics simulation results suggest that, for a calcite surface in equilibrium with a binary mixture of C10 and C17, more C17 molecules adsorb on the carbonate surface than the C10 molecules. Once CO2 molecules are added to the system, CO2 displaces C10 and C17 from calcite. The experimentally observed increase in the fraction of C17 thus can be attributed to the release of adsorbed C17. This study suggests that surface effects play a significant role in affecting flows and compositions of fluids in tight formations. In unconventional oil reservoirs, observed enhanced recovery from CO2 huff-n-puff could be partly attributed to surface effects in addition to the recognized gas-liquid interaction mechanisms.
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Abraham, M. J., Murtola, T., Schulz, R. 2015. GROMACS: High Performance Molecular Simulations through Multi-Level Parallelism from Laptops to Supercomputers. SoftwareX 1-2: 19-25. https://doi.org/10.1016/j.softx.2015.06.001.
Bailey, E. H., Snavely, P. D.Jr., and White, D. E. 1961. Chemical Analysis of Brines and Crude Oil, Cymric Field, Kern County, California. In Short Papers in the Geologic and Hydrologic Sciences, Articles 293-435: Geological Survey Research 1961, 306-309. Washington, D.C.: United States Government Printing Office.
Beggs, H. D. and Robinson, J. R. 1975. Estimating the Viscosity of Crude Oil Systems. Journal of Petroleum Technology 27(9): 1140-1141. https://doi.org/10.2118/5434-PA.
Bussi, G., Donadio, D., and Parrinello, M. 2007. Canonical Sampling through Velocity Rescaling. Journal of Chemical Physics 126(1):014101. https://doi.org/10.1063/1.2408420.
Cheng, A. L. and Huang, W. L. 2004. Selective Adsorption of Hydrocarbon Gases on Clays and Organic Matter. Organic Geochemistry 35(4): 413-423. https://doi.org/10.1016/j.orggeochem.2004.01.007.
Darden, T., York, D., and Pedersen, L. 1993. Particle Mesh Ewald: An N Log (N) Method for Ewald Sums in Large Systems. Journal of Chemical Physics 98(12): 10089-10092. https://doi.org/10.1063/1.464397.
Englehardt, W. V. and Gaida, K. H. 1963. Concentration Changes of Pore Solutions During the Compaction of Clay Sediments. Journal of Sedimentary Research 33(4): 919-930. https://doi.org/10.2110/33.4.919.
Gamadi, T. D., Sheng, J. J., and Soliman, M. Y. 2014. An Experimental Study of Cyclic CO2 Injection to Improve Shale Oil Recovery. Presented at the SPE Improved Oil Recovery Symposium, Tulsa, Oklahoma, 12-16 April. SPE-169142-MS. http://doi.org/10.2118/169142-MS.
Heller, R. and Zoback, M. 2014. Adsorption of methane and Carbon Dioxide on Gas Shale and Pure Mineral Samples. Journal of Unconventional Oil and Gas Resources 8: 14-24. https://doi.org/10.1016/j.juogr.2014.06.001.
Hunt, J. M. 1961. Distribution of Hydrocarbons in Sedimentary Rocks. Geochimica et Cosmochimica Acta 22(1): 37-49. https://doi.org/10.1016/0016-7037(61)90071-0.
Kang, S. M., Fathi, E., Ambrose, R. J. 2011. Carbon Dioxide Storage Capacity of Organic-Rich Shales. SPE Journal 16(4): 842-855. https://doi.org/10.2118/134583-PA.
Kemper, W. D. 1960. Water and Ion Movement in Thin Films as Influenced by the Electrostatic Layer of Cations Associated with Clay Mineral Surfaces. Soil Science Society of America journal 24(1): 10-16. https://dx.doi.org/10.2136/sssaj1960.03615995002400010013x.
Kuila, U. and Prasad, M. 2013. Specific Surface Area and Pore-Size Distribution in Clays and Shales. Geophysical Prospecting 61(2): 341-362. https://dx.doi.org/10.1111/1365-2478.12028.
Ma, J., Wang, X., Gao, R. 2015. Enhanced Light Oil Recovery from Tight Formations through CO2 Huff'n'Puff Processes. Fuel 154(15): 35-44. https://doi.org/10.1016/j.fuel.2015.03.029.
McKelvey, J. G. and Milne, I. H. 1962. The Flow of Salt Solutions Through Compacted Clay. Proc., Ninth National Conference on Clays and Clay Minerals, Purdue University, Lafayette, Indiana, 5-8 October, 248-259. https://doi.org/10.1016/B978-1-4831-9842-2.50017-1.
Neuzil, C. E. 2000. Osmotic Generation of ‘Anomalous’ Fluid Pressures in Geological Environments. Nature 403: 182-184. https://dx.doi.org/10.1038/35003174.
Egbogah, E. O. and Ng, J. T. 1990. An Improved Temperature-Viscosity Correlation for Crude Oil Systems. Journal of Petroleum Science and Engineering 4(3): 197-200. https://doi.org/10.1016/0920-4105(90)90009-R.
Olsen, H. W. 1969. Simultaneous Fluxes of Liquid and Charge in Saturated Kaolinite. Soil Science Society of America journal 33(3): 338-344. https://dx.doi.org/10.2136/sssaj1969.03615995003300030006x.
Potoff, J. J. and Siepmann, J. I. 2001. Vapor-Liquid Equilibria of Mixtures Containing Alkanes, Carbon Dioxide, and Nitrogen. AIChE Journal 47(7): 1676-1682. https://doi.org/10.1002/aic.690470719.
Rahaman, A., Grassian, V. H., and Margulis, C. J. 2008. Dynamics of Water Adsorption onto a Calcite Surface as a Function of Relative Humidity. Journal of Physical Chemistry 112(6): 2109-2115. https://dx.doi.org/10.1021/jp077594d.
Siu, S. W., Pluhackova, K., and Boöckmann, R. A. 2012. Optimization of the Opls-As Force Field for Long Hydrocarbons. Journal of Chemical theory and Computation 8(4): 1459-1470. https://dx.doi.org/10.1021/ct200908r.
Song, C. Y. and Yang, D. Y. 2017. Experimental and Numerical Evaluation of CO2 Huff-n-Puff Processes in Bakken Formation. Fuel 190(15): 145-162. https://doi.org/10.1016/j.fuel.2016.11.041.
Tovar, F. D., Eide, O., Graue, A. 2014. Experimental Investigation of Enhanced Recovery in Unconventional Liquid Reservoirs using CO2: A Look Ahead to the Future of Unconventional EOR. Presented at the SPE Unconventional Resources Conference, Woodlands, Texas, 1-3 April. SPE-169022-MS. https://doi.org/10.2118/169022-MS.
Vazquez, M. and Beggs, H. D. 1980. Correlations for Fluid Physical Property Prediction. Journal of Petroleum Technology 32(6): 968-970. https://doi.org/10.2118/6719-PA.
Wang, S., Feng, Q. H., Javadpour, F. 2015. Oil Adsorption in Shale Nanopores and Its Effect on Recoverable Oil-in-Place. International Journal of Coal Geology 147-148: 9-24. https://doi.org/10.1016/j.coal.2015.06.002.
Wyllie, M. R. J. 1948. Some Electrochemical Properties of Shales. Science 108(2816): 684-685. https://dx.doi.org/10.1126/science.108.2816.684.