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| Numerical simulation of gas transport at high temperature and high pressure in porous media with low water content |
| Received:April 13, 2017 Revised:July 11, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20170413002 |
| KeyWord:gas transport porous media gas at high temperature and high pressure porosity permeability |
| Author | Institution |
| 何增 |
西北核技术研究所, 西安 |
| 田宙 |
西北核技术研究所, 西安 |
| 王铁良 |
西北核技术研究所, 西安 |
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| Abstract: |
| In order to overcome the high nonlinearity of the model of non-isothermal liquid-gas two-phase flow in porous media, we have developed an appropriate discretization scheme.Based on the criteria of phase state transitions and the property of the governing equations, the minimum saturation method is adopted to reduce the complexity of the algorithm.For the spatial discretization, the finite volume scheme is used.For the time-domain discretization, a set of Picard iterative method which contains reasonable solving orders is designed to solve the strongly coupled equation systems.This numerical method is used to simulate the transport behavior of gas at high temperature and high pressure, demonstrating that the gas flow in a medium with low water content agrees well with that in a dry medium with an equivalent porosity.Phase transition between gas-liquid phases in the cavity is also analyzed.On this basis, the influences of porosity and permeability of porous media on evolution of gas pressure and transport of gas tracer are studied.It is found that the transport distance of gas tracer increases with decreasing porosity (for the same permeability) and increasing permeability (for the same porosity), and semi-empirical formulas are given to evaluate the transport distance of different porosities and permeabilities as well. |
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