Efficiency of diffusion controlled miscible displacement in fractured porous media |
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Authors: | J J Trivedi T Babadagli |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Alberta, School of Mining and Petroleum, 3-112 Markin CNRL-NREF, Edmonton, AB, Canada, T6G 2W2 |
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Abstract: | Experiments were performed to study the diffusion process between matrix and fracture while there is flow in fracture. 2-inch
diameter and 6-inch length Berea sandstone and Indiana limestone samples were cut cylindrically. An artificial fracture spanning
between injection and production ends was created and the sample was coated with heat-shrinkable teflon tube. A miscible solvent
(heptane) was injected from one end of the core saturated with oil at a constant rate. The effects of (a) oil type (mineral
oil and kerosene), (b) injection rates, (c) orientation of the core, (d) matrix wettability, (e) core type (a sandstone and
a limestone), and (f) amount of water in matrix on the oil recovery performance were examined. The process efficiency in terms
of the time required for the recovery as well as the amount of solvent injected was also investigated. It is expected that
the experimental results will be useful in deriving the matrix–fracture transfer function by diffusion that is controlled
by the flow rate, matrix and fluid properties. |
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Keywords: | Naturally fractured reservoirs Enhanced oil recovery Miscible displacement Matrix– fracture interaction Molecular diffusion |
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