Flow Properties Of Coal

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ISBN 13 :
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Download or read book Measurement of the Flow Properties of Coals for In-situ Gasification. Final Report, December 1977--November 1978. [With Dependence on Degree of Water Saturation]. written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effective and relative permeabilities of six coals, comprising thirty-five samples, to nitrogen and carbon dioxide were measured as functions of water saturation and overburden pressure. The coals consist of bituminous, sub-bituminous and lignite types. Simulated overburden pressures ranged from 200 psig to 550 psig. All tests were performed over a decreasing water saturation cycle. Values of porosity, absolute permeability, shrinkage and critical gas saturation were measured on numerous samples. Average values are correlated as to coal type and structural orientation whenever the latter was discernible. The results indicate that CO/sub 2/ reduces the effective permeabilities by a moderate amount vis-a-vis nitrogen. The effect of overburden pressure was to drastically reduce the effective permeabilities. The relative permeability curves were significantly distinct as regards coal type and generalized (averaged) results are presented for universal employment. The characteristic shape of the relative permeability curves remain approximately independent of the magnitude of the stress field. In all, sixty-seven cores were tested over the two year period of both contracts, yielding seventy-six effective permeability curves. Thirty-five samples were tested during the current contract period, yielding forty-four effective permeability curves. Numerous other samples were tested for various point values, such as porosity and absolute permeability.