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Showing 1 to 7 of 7 for “"Coal permeability"”.
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LABORATORY INVESTIGATION OF COAL PERMEABILITY UNDER REPLICATED IN SITU STRESS REGIME
The cleat permeability of coal, a key to the success of any coalbed methane (CBM) recovery operation, is a dynamic parameter impacted by changes in effective stress and desorption-induced "matrix shrinkage". Most commonly-used theoretical models developed to predict CBM production as a result of …
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Effects of size and shape of specimens and gas slippage phenomena in the measurement of coal permeability to gas flow
… importance in the study of the gas emission in coal mines. Air is commonly used as the fluid medium in gas permeability tests. In this case, it is advisable to take into account the existence of gas slippage phenomena. The experimental results showed that the value of the observed permeability …
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Estimation of the methane resources in the Richmond coal basin, Virginia
Methane, the natural by product of the coalification process, is held within coal beds under pressure. It is recognized that most of the methane present in coal occurs in the adsorbed state. The amount of methane present depends mainly on the pressure, temperature, adsorptive capacity and moisture …
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Coalbed gas origin and distribution in the southeastern Illinois Basin
Coal seams worldwide contain biogenic methane that in some coal basins forms easily accessible and large amounts of coalbed methane (CBM). Economically important biogenic CBM occurs not only in coals of low rank but also in higher rank coals where uplift and brine dilution initiated microbial …
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Optimization of Coalbed Methane Completion Strategies, Selection Criteria and Production Prediction: A Case Study in China's Qinshui Basin
… was used to determine the optimum strategy for coalbed methane production in China's Qinshui Basin. Multiple completion strategies were analyzed for pre-mining methane drainage on the bases of economic, environmental, and mining-safety-based factors. Effective degasification in the Qinshui Basin …
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LABORATORY-SCALE INVESTIGATION OF PERMEABILITY AND FLOW MODELING FOR HIGHLY STRESSED COALBED METHANE RESEROVIRS USING PULSE DECAY METHOD
… steady flow method (SFM), most commonly used for permeability measurement in the laboratory, is not applicable for tight rocks, higher rank coals and coals under highly stressed condition because of the difficulty in measuring steady-state gas flowrates resulting from the tight rock structure of. …
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PRELIMINARY EXPERIMENTAL AND MODELING STUDY OF PRESSURE DEPENDENT PERMEABILITY FOR INDONESIAN COALBED METHANE RESERVOIRS
… to the understanding of the dynamic nature of permeability of Indonesian coal. It is the first-of-its-kind study, first presenting a comparison of experimental results with those obtained using existing analytical permeability models, and then modifying the existing anisotropic model for …