Abstract
The impact of coal pore structure on adsorption-induced matrix swelling of three coals of different ranks was investigated experimentally. The swelling strain measurements for the selected samples of the two higher rank coals suggested that variation in the sample pore size distribution, particularly the microporosity, has a larger impact on matrix swelling induced by adsorption of CO2 than by adsorption of less adsorbing gases. The swelling behaviour recorded for the low rank coal may be explained by the level of microporosity or lack of it. From flue gas ECBM point of view, the swelling strain data tentatively suggests that the low rank coal would experience less swelling, compared to the higher rank coals.
Highlights
IntroductionCoal is characterised as a dual porosity reservoir rock system, which consists of porous-solid blocks known as matrix (primary porosity), bounded by a well-defined network of natural fractures known as cleats (secondary porosity)
Coal is characterised as a dual porosity reservoir rock system, which consists of porous-solid blocks known as matrix, bounded by a well-defined network of natural fractures known as cleats
It can be seen that Coal A and Coal B generally exhibit bi-modal pore structure, with pore volume mainly residing in micro-/mesoand macropores
Summary
Coal is characterised as a dual porosity reservoir rock system, which consists of porous-solid blocks known as matrix (primary porosity), bounded by a well-defined network of natural fractures known as cleats (secondary porosity). The cleats are the main flow conduits in a coal seam, whereas methane is primarily stored by adsorption in the micropores (pore size
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