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Experimental studies on the changing characteristics of the gas flow capacity on bituminous coal in CO2-ECBM and N2-ECBM by Lei Zhang; Jinghua Li; Junhua Xue; Cun Zhang; Xinqiu Fang is a Engineering article available to read on EtoBox.

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Compared with the pre-modification technique, such as hydraulic fracturing, the gas injected for enhanced coalbed methane recovery (ECBM) technique offers not only a good economic advantage by enhancing the CH4 recovery, but also provides an environmental benefit with CO2 storage, and the changing characteristics of the flow capacity in coal reservoir critical affect both the CH4 production and CO2 geo-sequestration. In this pursuit, the present study envisaged the determination of the change in characteristics of the gas flow capacity in ECBM using N2 and CO2 core flood experiments on CH4 saturated bituminous coal. The critical controlling factors of the changing characteristics were discussed. The whole experimental process was divided into two stages, in which the first stage was an unsteady flow in coal that directly led to a sharp drop on both the volumetric strain and the outflow rate, while the second stage was a steady flow in coal. It was found that the changing trend of permeability in both tests followed the same relationship: rise (I), stable (II), slowly drop (III), steady-state (IV). The differences on both the flowing ability and the displacing effect between CO2 and

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Author

Lei Zhang; Jinghua Li; Junhua Xue; Cun Zhang; Xinqiu Fang

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)