Abstract
We studied the influence of wettability on relative permeability by altering the surface chemistry of coal from the Dawson Creek mine (Bowen Basin, Australia) with hydrogen peroxide (D-H2O2) and a silane treatment (D-silane). The distributions of wetting contact angles measured by a falling particle method were centred around θ = 63° in untreated coal, θ = 56° in D-H2O2, and θ = 89° in D-silane. We constructed homogeneous and artificial cores from the treated powders. Relative permeabilities were measured with N2 and 4 %wt KCl brine by the steady state method in a Hassler-type core flooding apparatus. The relative permeability curves for D-H2O2 had a crossover point at Swx = 0.53, and a higher critical water saturation (Swr = 0.43) than D-untreated (Swr = 0.36). To assess potential of using near-wellbore chemical treatments to facilitate dewatering of coal seams and enhance gas production, we performed a hypothetical reservoir simulation study.
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