Methane modeling: predicting the inflow of methane gas into coal mines. Quarterly technical progress report, January 2, 1981-March 31, 1981.
Boyer-CM II; Morrison-HL; Schwerer-FC
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, C-30123, 1981 Apr; :1-25
Salient features of technical progress for the first quarter are the following: (I) computer-assisted literature searches have been completed for several strategies designed to cover different aspects of the model development and evaluation program. Some strategy refinement and additional searches are required. Ultimately a comprehensive bibliography will have been compiled and evaluated; (II) basic mathematical components that are sufficient for the development of a first numerical model for water and methane flows to coal mines have been identified. This initial set of components is a basis for the collection and analysis of refinements to provide more realistic accounts of the complex factors affecting coal-bed methane during mining and degasification; (III) a set of basic partial differential equations for flow of water and gas in a horizontal, homogeneous coal seam has been formulated in terms of pressure, pore saturation, and adsorbed gas variables and presented in normalized form for numerical solution. Equation sets corresponding to alternative choices of dependent variables will be formulated and compared with this initial set and (IV) computer subroutines have been modified and assembled to implement one-dimensional, nonsteady, two-phase flow models. These programs implement numerical, finite-difference, method-of-lines algorithms in a format that facilitates substitution of mathematical components and equation sets. Initial runs with this software package have illustrated the superiority of a particular space-discretization scheme and provide data for comparison of grid and permeability weighting schemes.
Coal mines; Coal seams; Computer codes; Degassing; ERDA/012000; Fluid flow; Gas flow; Information retrieval; Kinetics; Mathematical models; Methane; NTISDE; One-dimensional calculations; Water
CP; Final Contract Report
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, C-30123
United States Steel Corp.