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- W87977869 abstract "Water influx to an operating underground coal gasification (UCG) cavity plays a major role in determining the success of the process. Often coal seams are aquifers, and as a result water influx estimates for a UCG cavity need to consider the flow of water from the coal to the cavity. Since the gasification cavity is gas filled, the flow takes place in the presence of a developing phreatic (free surface) separating the water saturated portion of the seam from the expanding unsaturated region. In this paper results are presented for water influx calculations for several geometries with phreatic surfaces related to UCG systems. Numerical solutions of the defining equations are compared to solutions obtained for simplified equation sets resulting from the application of the Dupuit approximation. Such approximate solutions appear to be adequate during initial transients and are more amenable to incorporation in global UCG models. Consideration is given to the influence of geometry, permeability, porosity, formation compressibility and the motion of cavity walls. In addition to general results, specific estimates of water influx for the upcoming Rocky Moutain I test are reported. 5 refs., 16 figs., 1 tab." @default.
- W87977869 created "2016-06-24" @default.
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- W87977869 date "1987-08-06" @default.
- W87977869 modified "2023-09-24" @default.
- W87977869 title "Unconfined flow as a mechanism of water influx to a UCG (underground coal gasification) system" @default.
- W87977869 hasPublicationYear "1987" @default.
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