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Effect of temperature on foam flow in porous media

Effect of temperature on foam flow in porous media

Journal of Industrial and Engineering Chemistry v.36 , 2016년, pp.229 - 237   http://dx.doi.org/10.1016/j.jiec.2016.02.001
L. Kapetas, S. Vincent Bonnieu, S. Danelis, W.R. Rossen, R. Farajzadeh, A.A. Eftekhari, S.R. Mohd Shafian, R.Z. Kamarul Bahrim

Foam can increase sweep efficiency within a porous medium, which is useful for oil-recovery processes[1]. The flow of foam in porous media is a complex process that depends on properties like permeability,porosity and surface chemistry, but also temperature. Although the surface activity of surfactants as afunction of temperature is well described at the liquid/liquid or liquid/gas interface, data on the effect oftemperature on foam stability is limited, especially in porous media. In this work, we tested a surfactant (AOS) at different temperatures, from 20 8C to 80 8C, in asandstone porous medium with co-injection of foam. The pressure gradient, or equivalently the apparentviscosity, was measured in steady-state experiments. The core-flood experiments showed that theapparent viscosity of the foam decreased by 50% when the temperature increased to 80 8C. This effectcorrelates with the lower surface tension at higher temperatures. These results are compared to bulkfoam experiments, which show that at elevated temperatures foam decays and coalesces faster. Thiseffect, however, can be attributed to the faster drainage at high temperature, as a response to thereduction in liquid viscosity, and greater film permeability leading to faster coarsening. Our results using the STARS foam model show that one cannot fit foam-model parameters to data atone temperature and apply the model at other temperatures, even if one accounts for the change in fluidproperties (surface tension and liquid viscosity) with temperature. Experiments show an increase in gasmobility in the low-quality foam regime with increasing temperature that is inversely proportional tothe decrease in gas-water surface tension. In the high-quality regime, results suggest that the watersaturation at which foam collapses fmdry increases and Pc* decreases with increasing temperature.

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