Experiment of the influence of CO2 injection on the viscosity of crude oil system and its prediction model
In order to investigate the impact of temperature,pressure,and CO2 concentration on crude oil viscosity,laboratory experiments were conducted by using a system consisting of light crude oil and CO2.The results indicate that,under specific tem-perature or CO2 concentration,crude oil viscosity exhibits a trend of initially decreasing and then increasing with changes in pressure,with the saturation pressure playing a critical turning point role.Furthermore,under a constant pressure,a decrease trend of crude oil viscosity with increase of temperature is observed.Temperature had a more pronounced effect on viscosity in comparison to pres-sure.Moreover,as CO2 concentration increases,the influence of temperature on viscosity gradually diminishes.A new prediction model with saturated pressure corrected by the Beers-Lambert model is proposed,reducing the absolute mean percentage error from 52.83%to 8.96%.This model exhibits better prediction accuracy under light crude oil conditions,providing some theoretical guid-ance for practical production.
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