the volumetric changes in the coal matrix (coal shrinkage), permeability under various gas environment conditions as well as perographical properties were studied in the laboratory. the shrinkage and permeability of coal were examined with respect to changing gas type and confining pressures. the shrinkage tests were carried out in high-pressure bombs while the permeability study was conducted ...

Understanding the effect of coalification on diffusion methane in middle-high rank coals (MHRC) is fundamental for optimizing coalbed (CBM) drainage strategies. Safe coal mining relies critically this approach. Hence, CH4 adsorption/desorption experiments and a new model were used to study behavior five different metamorphic degree from China. The results indicate that, as vitrinite reflectance...

Coalbed Methane (CBM) is an unconventional form of natural gas which self-generated and self-stored in coal seams. In order to realize the effective exploitation CBM Zhengzhuang block, microstructure, wettability, permeability, rock mechanics in-situ stress were studied this research. It found that high rank anthracite characterized by vitrinite content low inorganic mineral content, abundant C...

The area studied covers unmined Pennsylvanian Ćwiklice and Dankowice coal deposits located in the southern part of Upper Silesian Coal Basin, Poland. geological structure clearly affects current distribution methane. content methane is lower seams lying within porous permeable sandstones (Łaziska sandstones), whereas it higher that occur sequences (Mudstone Series) where impermeable shales muds...

As a kind of clean energy, the exploration and development coalbed methane (CBM) are great importance significance. In this paper, CBM reservoir parameters working area in Western Guizhou Province, China, were predicted by using 3D seismic technology, sweet-spot was evaluated based on prediction results. terms data interpretation, while traditional technology is extended to study CBM, new techn...

Original scientific paper Laboratory tests were conducted to study coal spontaneous combustion at low-temperature (30 ÷ 200 °C) in the air of reduced oxygen (10 ÷ 21 %) and low methane concentrations (0 ÷ 3 %). The production of carbon monoxide in coal spontaneous combustion was analysed. The test results show that both oxygen and methane concentrations affect coal spontaneous combustion. At gi...