Fluid Flow through CBM Reservoirs
1. Feasible to quantify ‘gas storage capacity’ and ‘diffusion coefficient of coal’ as a function of ‘pore-structure’ evolution and it’s influence on gas-solid interactions of coal, for low-, medium- and high-rank colas?
2. If ‘coal-matrix’ remains ‘highly compacted’, and, if the ‘cleats’ remain ‘under-developed fractures’, then, would it remain feasible to characterize the ‘transport of CBM gas’ as a function of the ‘well-defined cleat-matrix pore-network’, where we have a clarity on (a) the ‘rate of adsorption’ and the ‘rate of desorption’ of CBM gas within the coal-matrix - as a function of ‘reservoir pressure’, ‘reservoir temperature’ and ‘effective stress’? (b) the transport of ‘CBM gas’ within the ‘low-permeable matrix’; (what exactly dictates the resulting transport process to remain either to be ‘pressure gradient’ or to be ‘concentration gradient’ within the coal-matrix)?; and on (c) the ‘exchange of CBM gas’ between ‘cleats’ and ‘matrix’ through cleat-matrix interface – influenced by the mechanical ‘cleat-matrix interaction’, on top of, getting influenced by the ‘pore pressure’ and ‘boundary stress’?
Feasible to ensure the continuity of ‘methane-gas mass fluxes’ at the interface between cleats and matrix?
By default, can we consider all the ‘coal-matrix’ to remain to be ‘storage units of CBM gases’, while, all the ‘cleats’ to remain to be the high-conductivity conduits, through which, CBM gases gets transported towards the production well?
How do we correlate the influence of ‘chemical heterogeneity’ on ‘methane storage’ (O/C ratio; oxygen containing groups – estimated either using ‘GCMC/MD’ algorithms) with the above queries that addresses the reservoir characterization at a relatively larger scale?
3. Considering the roles of ‘free and dissolved gases’, particularly, in ‘low rank coals’ – make the ‘CBM Reservoir Modeling’ – a relatively complex process (albeit, the dominance of ‘adsorbed gas’ in ‘middle- and high-rank colas’)? In case, if we ignore these free and dissolved gases in low rank coals, then, won’t it significantly impact the estimation of total, adsorbed and free gas contents – associated with the production of CBM?
4. Can we completely ignore the presence of ‘dissolved gases’ in ‘marine shales’ having an elevated ‘thermal maturity’?
5. Do we have the concept of ‘lost gas’ @ lab-scale using experimental investigations – on top of (a) desorbed gas; and (b) residual gas – towards estimating ‘total gas content’?
If not, how do we take into account the ‘lost gas’ that usually ‘escapes from the sample’ ‘during its collection and retrieval’ itself?
6. How do we correlate the concept of ‘time zero’ @ ‘lab-scale’?
7. How difficult would it be to correlate 'Langmuir volume' (gas adsorption volume) with that of 'Langmuir pressure' that defines the ability of a well to attain critical desorption pressure – towards planning 'initial water depletion rate'?
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