Coal bed methane (CBM) extraction has astounding effects on the global energy budget. Since earliest discoveries of CBM, this natural gas form witnessed ever-increasing demands from core sectors economy. CBM is an unconventional source occurring naturally within coal beds. The multiphase generation during evolution commences with microbial diagenesis sedimentary organic matter peatification, fo...

Coal reservoirs have characteristically low permeability and pressure are highly sensitive to damage during well completion. Therefore, systematic reservoir protection measures must be taken in the process of coalbed methane exploitation. However, some areas such as Qinshui basin, there is a contradiction between sidewall stability horizontal (CBM) wells coal seams, which becomes main technical...

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...

In longwall development mining of coal seams, planning, optimizing and providing adequate ventilation are very important steps to eliminate the accumulation of explosive methane–air mixtures in the working environment. Mine operators usually try to supply maximum ventilation air based on the capacity of the system and the predicted need underground. This approach is neither economical nor safer...

Microwave heating is an efficient thermal stimulation approach in developing coalbed methane (CBM). In this paper, a new microwave technology for CBM proposed and two structure schemes of waveguide antennas are designed. After characterizing the mathematical model coaxial antenna radiation, numerical coal reservoir heated by established, which couples both electromagnetic field heat transfer. T...

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...

The current average daily gas production of single coalbed methane (CBM) wells in China is less than 1,300 m3. low rate CBM dramatically limits the sustainable development industry China. To promote development, three universal geological factors, i.e., sources, channels, and driving force are analyzed, considering various complicated conditions reservoirs Additionally, we find that growth prov...

The South Yanchuan block is the deepest developed high-rank coalbed methane (CBM) field in China, geological conditions this are complex and main controlling factors of CBM content various. Thus, a decision-making model potential deep resource based on geographical information system (GIS) weighted linear combination (WLC) established, influence analyzed, favorable areas divided. Results show t...