Abstract
Gas permeability is an important characteristic of coal seam(s) to determine the economic success of CH4 extraction and CO2 sequestration. There exists no comprehensive approach to predict the mechanical behaviour during CH4 extraction, and CO2 sequestration as coal is highly heterogeneous. Exhaustive laboratory experimentation is often the only approach to successfully predict its behaviour. Coal experiences triaxial stress conditions when change of force field occurs. This paper presents the mechanical properties and change in gas permeability at varying confining as well as gas pressures in a triaxial experimental set-up using Darcy’s approach. Mutual relations between permeability, in situ confining pressure as well as gas pressure have been established statistically. A reservoir simulation investigation has been carried out to predict the rate of coal bed methane (CBM) production and the cumulative amount of CBM over the 5-year life of production well.
Highlights
Coal permeability, porosity, cleat structure, adsorption/desorption of gases, in situ stress–strain of coal matrix are major parameters that influence coal bed methane (CBM) production and CO2 sequestration
This paper investigated the coal characteristics and gas permeability of coal from different parts of Jharia coal basin, India
Decreased permeability with gas pressure and horizontal pressure confirms the closure of pores as well as cleat structure
Summary
Porosity, cleat structure, adsorption/desorption of gases, in situ stress–strain of coal matrix are major parameters that influence CBM production and CO2 sequestration. Decreased permeability was reported for coal samples as the high confining pressure closed internal fractures (Siriwardane et al 2009). The coal permeability depends on the coal fractures controlled by strata stress and gas pressure which changes with depth (Guo and Cheng 2013).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
