THERMAL SCIENCE
International Scientific Journal
THERMAL DIFFUSION AND FLOW PROPERTY OF CO2/CH4 IN ORGANIC NANOPORES WITH FRACTAL ROUGH SURFACE
ABSTRACT
The kerogen is rich in complex pore networks with a random rough surface, which is a factor controlling the thermal diffusion and flow property of gases. In this work, we construct organic-rich nanopore with fractal surfaces by inserting and deleting carbon atoms. The adsorption ability, thermal diffusion property, and flow velocity of CO2 /CH4 in the nanopore are analyzed using with molecular simulations. The results showed that the adsorption capacity of CO2 is nearly twice that of CH4, which is decided by adsorption enthalpy, whereas the maximum thermal diffusion ability of CO2 is only 23.7% that of CH4. With external pressure gradients imposed on the system, the flow speed of CO2 was lower than that of CH4 for nanopores with different roughness. These findings provide a theoretical basis for the feasibility of CO2 exploitation of shale gas.
KEYWORDS
PAPER SUBMITTED: 2018-09-12
PAPER REVISED: 2018-11-20
PAPER ACCEPTED: 2019-01-25
PUBLISHED ONLINE: 2019-05-26
THERMAL SCIENCE YEAR
2019, VOLUME
23, ISSUE
Issue 3, PAGES [1577 - 1583]
- Wu, T., et al., Multiscale Pore Structure and Its Effect on Gas Transport in Organic-rich Shale, Water Resources Research, 53 (2017), 7, pp.5438-5450
- Patzek, T., et al., A Simple Model of Gas Production from Hydrofractured Horizontal Wells in Shales, Aapg Bulletin, 98 (2014), 12, pp. 2507-2529
- Li, Z., et al., Liquid Nitrogen Gasification Fracturing Technology for Shale Gas Development, Journal of Petroleum Science and Engineering, 138 (2016), pp. 253-256
- Loucks, R.G., et al., Morphology, Genesis, and Distribution of Nanometer-scale Pores in Siliceous Mudstones of the Mississippian Barnett Shale, Journal of Sedimentary Research, 79 (2009), 12, pp. 848-861
- Wang, S., et al., Fast Mass Transport of Oil and Supercritical Carbon Dioxide through Organic Nanopores in Shale, Fuel, 181 (2016), pp. 741-758
- Bousige, C., et al., Realistic Molecular Model of Kerogen's Nanostructure, Nature Materials, 15 (2016), 5, pp. 576-582
- Zhu, X., et al., Atomic Mechanisms and Equation of State of Methane Adsorption in Carbon Nanopores, The Journal of Physical Chemistry C, 118 (2014), 31, pp. 17737-17744
- Castez, M. F., et al., Methane Flow Through Organic-rich Nanopores: the Key Role of Atomic-scale Roughness, The Journal of Physical Chemistry C, 121 (2017), 51, pp. 28527-28536
- Ju, Y., et al., Fractal Model and Lattice Boltzmann Method for Characterization of Non-Ddarcy Flow in Rough Fractures, Scientific Reports, 7 (2017), pp. 41380
- Zeng, Y., et al., Gas Transport in Self-affine Rough Microchannels of Shale Gas Reservoir, Journal of Petroleum Science and Engineering, 167 (2018), pp. 716-728
- Plimpton, S., Fast Parallel Algorithms for Short-Range Molecular Dynamics, Journal of Computational Physics, 117 (1993), 1, pp. 1-19
- Evans, D. J., et al., the Nose-Hoover Thermostat, Journal of Chemical Physics, 83 (1985), 8, pp 4069-4074
- Soave, G., Equilibrium Constants from a Modified Redlich-Kwong Equation of State, Chemical Engineering Science, 27 (1972), 6, pp 1197-1203
- Huang, L., et al., Molecular Simulation of Adsorption Behaviors of Methane, Carbon Dioxide and Their Mixtures on Kerogen: Effect of Kerogen Maturity and Moisture Content, Fuel, 211 (2018), pp. 159-172
- Kulasinski, K., et al., Water Diffusion in Amorphous Hydrophilic Systems: a Stop and Go Process, Langmuir, 31 (2015), 39, pp. 10843-10849
- Cha, J., et al., Molecular Dynamics Simulation of Dispersion Improvement of Graphene Sheets in Nanofluids by Steric Hindrance Resulting from Functional Groups, Molecular Simulation, 43 (2016), 3, pp 228-233
