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- W2550766609 abstract "Abstract This paper examines the decoupling of small-scale heterogeneity (dispersion) and permeability variation in a two-well tracer injection. Tracer transport in heterogeneous reservoirs is governed by spreading (because of the spatial variability of permeability) and mixing (due to dispersion); the combined effects of these two phenomena can be described at very late times (rarely met in practice) by Taylor's theory of asymptotic dispersion. However, decoupling of the heterogeneities at earlier times (pre-asymptotic) has yet to be evaluated. A systematic approach is presented to study tracer propagation (across all layers) in the absence of any cross-flow for a heterogeneous stratified reservoir. The fraction of layers where tracer transport occurs faster than the dispersion mechanism is determined; this fraction represents layers where channeling may take place. Obviously, the larger the fraction, the lower the sweep efficiency. Next, the analysis is extended to five-spot, using the analogy between streamlines and layers with no-cross flow; decoupling of the convective spreading from small-scale heterogeneity is successfully examined for a heterogeneous quarter five-spot pattern. An accurate prediction of true dispersion is an essential step in designing of a successful miscible displacement. It improves production forecasts and, consequently, economic evaluation of the project." @default.
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- W2550766609 date "2016-11-12" @default.
- W2550766609 modified "2023-09-25" @default.
- W2550766609 title "Contribution of Dispersion and Permeability Variation on Propagation of Tracer Concentration in Permeable Media" @default.
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- W2550766609 doi "https://doi.org/10.2523/iptc-18954-ms" @default.
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