Methane is a powerful greenhouse gas and the principal component of natural gas. Coal seams often contain significant quantities of methane, and underground coal mines must ensure that methane released into the mine during coal extraction does not build to dangerous levels. This is accomplished in part through the use of large-volume ventilation systems that remove methane from the mine and rel...

Abstract Despite the significant progress made in coalbed methane (CBM) exploration and development recent years, understanding of CBM enrichment mechanisms remains limited. This study aims to elucidate mechanism southern Qinshui Basin, China, by analyzing characteristics global basins building a geological model area. Field analyses are conducted predict sweet spots high abundance production p...

Coal mining is responsible for 11% of total anthropogenic methane emission thereby contributing considerably to climate change. Attempts to harvest coalbed methane for energy production are challenged by relatively low methane concentrations. In this study, we investigated whether nutrient and acetate amendment of a non-producing sub-bituminous coal well could transform the system to a methane ...

Deep coalbed methane (CBM) is widely distributed in China and mainly commercially exploited the Qinshui basin. The situ stress moisture content are key factors affecting permeability of CH4-containing coal samples. Therefore, considering coupled effects compressing infiltrating on gas could be more accurate to reveal CH4 seepage characteristics CBM reservoirs. In this study, samples sourced fro...

Based on the theories of mass conservation and coalbed methane (CBM) adsorption/desorption, this paper first establishes a novel reservoir pressure model for CBM production, following which, concentration production models are also proposed. Then, these programmed solved by means finite element method. Taking Hunchun field in Jilin province, China, as an example, pressure, gas concentration, ch...

Abstract Coal is a kind of rock with the characteristics soft structure, developed joints, cleats, cracks, and pores, resulting in that its mechanical behaviors are highly sensitive to stress, pore coalbed methane (CBM, gas) pressure temperature. Thus, due variations temperature caused by drilling operation, coal surrounding wellbore can be easily damaged, which would cause serious instability ...

The determination of a reasonable drainage rate coalbed methane (CBM) in vertical wells the single-phase flow stage can provide maximise transmission water pressure over distance. Based on principle effective stress and Darcy’s law, mathematical model for dynamic changes permeability was established; this basis, relationship between threshold gradient experimentally attained; according to linka...