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Development of advanced reservoir characterisation and simulation tools for improved coalbed methane recovery, Publishable Report

Project ID: ENK6-CT-2000-00095
Funded under: FP5-EESD


The main objective of this project was to investigate the basic scientific theory involved in the injection and retention of CO2 in coal. The aim was to understand the fundamental mechanisms of water and CO2-CH4 adsorption/desorption, diffusion/counter diffusion and two-phase flow under simulated reservoir conditions (stress, pore pressure and temperature) and to formulate these mechanisms for the development of predictive models for CO2-ECBM recovery and CO2 storage simulators. The project aimed at developing the technology and the tools to enable a more accurate assessment of the potential for improved methane recovery and CO2 storage.
A methodology has been developed for cleat angle characterisation from either drilling cuttings or CTscans of coal blocks, using quantitative image analysis. The cleat angle distribution obtained can be used as an input parameter for the cleat orientation in reservoir flow simulations.
Adsorption isotherms for both CO2 and CH4 were measured on dry and wet European coal samples of various sizes (ranging from < 0.063 mm to > 2 mm) at 45°C. A simplified three-parameter diffusion model was developed and applied to fit the experimental pressure unloading curves obtained for both dry and well Silesia samples. High pressure/high temperature flushing tests were carried out whereby supercritical CO2 was injected into large cores initially saturated with methane under both dry and wet conditions. The obtained experimental data were analysed and evaluated using sub-cleat to cleat scale (< 1cm) and core scale (< 1m) models developed.

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