Oil Displacement for One-Dimensional Three-Phase Flow with Phase Change in Fractured Media |
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Authors: | Hai-Shan Luo Xiao-Hong Wang |
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Institution: | (1) Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China |
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Abstract: | In this article, the numerical simulations for one-dimensional three-phase flows in fractured porous media are implemented.
The simulation results show that oil displacement in matrix is dominated by oil–water capillary pressure only under certain
conditions. When conditions are changed to decrease the amount of water entering into the fractured media from the boundary
of the flow field, water in fracture may be vaporized to superheated steam. In these cases, the appearance of superheated
steam in fracture rather than in matrix will decrease the fracture pressure and generate the pressure difference between matrix
and fracture, which results in oil flowing from matrix to fracture. Assuming that oil is wetting to steam, the matrix steam–oil
capillary pressure will decrease the matrix oil-phase pressure as the matrix steam saturation increases. After the steam–oil
capillary pressure finally exceeds the pressure difference due to the appearance of superheated steam in fracture, the oil
displacement in matrix will stop. It is also shown that variations of the water relative permeability curve in matrix do not
result in different mechanisms for oil displacement in matrix. The simulation results suggest that the amount of liquid water
supply from the boundary of flow field fundamentally influence the mechanisms for oil displacement in matrix. |
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Keywords: | Fluid flows in porous media Multi-phase flows Fractured media Steam injection Oil recovery |
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