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|competition=June 2015

|competition=June 2015

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CBM is one of the unconventional energy sources which many countries have been started to be explored seriously and coal bed methane is kind of renewable energy. CBM is notably different from a typical conventional gas reservoir, as the methane is stored within the coal by a process called adsorption. The methane is in a near-liquid state, and lines the inside of pores within the coal (called the matrix). The open fractures in the coal (called the cleats) can also contain free gas or can be saturated with water. The system is then called a “dual-porosity reservoir”, one characterized by a complex interaction of the coal matrix and cleat system coupled through the desorption process. The mechanism for gas flow in the coal involves three steps:  

CBM is one of the unconventional energy sources which many countries have been started to be explored seriously and coal bed methane is kind of renewable energy. CBM is notably different from a typical conventional gas reservoir, as the methane is stored within the coal by a process called adsorption. The methane is in a near-liquid state, and lines the inside of pores within the coal (called the matrix). The open fractures in the coal (called the cleats) can also contain free gas or can be saturated with water. The system is then called a “dual-porosity reservoir”, one characterized by a complex interaction of the coal matrix and cleat system coupled through the desorption process. The mechanism for gas flow in the coal involves three steps: (1) desorption of the gas from the coal surface inside the micropores, (2) diffusion of the gas through the micropores of the coal matrix, and (3) Darcy flow through the fracture (cleat) network to the wellbore. Therefore research of CBM is important.  

# desorption of the gas from the coal surface inside the micropores,  

# diffusion of the gas through the micropores of the coal matrix, and  

# Darcy flow through the fracture (cleat) network to the wellbore. Therefore research of CBM is important.  

For many years, the western frontier of CBM development seemed to have progressed no farther than the Uinta Basin. Coals found near the surface were mined beginning in the 1850s and the underground workings reveal much of what geologist know about the intricate structure and the nature of the coals themselves, including the presence of gas. Indeed, it was the documentation of methane-related mine incidents and the famous “Flaming Geyser” phenomenon at a 1911 well site in King County that first attracted Amoco and a number of independents to explore for CBM gas in western Washington in the 1980s (Stephen D. Schwochow, 2006).

For many years, the western frontier of CBM development seemed to have progressed no farther than the Uinta Basin. Coals found near the surface were mined beginning in the 1850s and the underground workings reveal much of what geologist know about the intricate structure and the nature of the coals themselves, including the presence of gas. Indeed, it was the documentation of methane-related mine incidents and the famous “Flaming Geyser” phenomenon at a 1911 well site in King County that first attracted Amoco and a number of independents to explore for CBM gas in western Washington in the 1980s (Stephen D. Schwochow, 2006).