Abstract
ABSTRACT Reservoir brines typically contain dissolved salts and gases. While correlations have been published for prediction of viscosity as a function of temperature, pressure and salinity, little data is available regarding the effect of dissovled gases on brine viscosity. In the current work, the viscosity of methane and ethane saturated water and brine has been measured at 100, 150, and 250°F over a pressure range of 0-7,500 psig. For methane in pure water, viscosity increases by up to 6%. At pressures above 2,000 psig, the viscosity is independent of saturation pressure. Dissolved ethane showed no measurable effect on water viscosity. Brine viscosity also increases with methane saturation pressure. A correlation is presented for the correction of brine viscosity to account for gas saturation.
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