Coalbed methane completions: A world view

Coal mine methane: A review of capture and utilization practices with benefits to mining safety and to greenhouse gas reduction

“…A water-jet cutting system helps create artificial slices in the coal to increase its permeability for improvement of methane drainage. Palmer (2010), after collecting data on coal gas production worldwide, discussed the role of permeability in choosing well completions. He defined permeability bands as ranges of coal permeability in which certain well completion types can be preferred.…”

Research of Coalbed Methane Development Well-Type Optimization Method Based on Unit Technical Cost

“…Permeability is to be a key parameter in determining CBM well drilling and completion. Optimization of drilling and completion is usually established based on permeability [25]. Zhang Jiawei (2011) analyzed the characteristics of different CBM development techniques, their advantages and disadvantages, and provided specific recommendations for well-type selection for Fanzhuang block, a main CBM resource basin in China [26] 2003), respectively, analyzed the parameters having important impacts on recoverable CBM resources, and provided implications for well-type selection [27][28][29][30].…”

A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

“…Moreover, an average fluid pressure composed of the pressure of each fluid weighted by their degree of saturation is used in the same way the reservoir pressure is defined in Equation 59 [77]. Thence, the effective stress σ i j is formulated as follows 3 :…”

“…About 90,000 CBM wells have been drilled in the USA, producing annually between 1 and 2 trillion cubic feet in the recent years ( Figure 1). It represents almost 10% of the American natural gas production [3]. CBM production decreased in the past years but it is likely correlated to the oil price because American basins are expected to produce significant amounts of methane for at least one or two decades [4].…”