The stability of water annulus transportation of heavy oil poses a significant challenge.The CFD software was used to study the factors of oil-water density difference,viscosity difference and oil-water two-phase velocity.Simulation results demonstrate that reducing the oil-water density difference leads to decreased pressure gradient,reduced eccentricity,and increased oil transportation efficiency(η),and the maximum η can reach 11.54.Although an increase in oil phase viscosity results in higher pressure gradient,it improves η significantly,with a maximum η value reaching 92.47.In the case of variable water velocity,too small water velocity will form stratified flow with large pressure gradient.After the formation of stable water annular,too large water velocity will increase the total flux of pipeline and reduce η.The increase of oil velocity will increase the pressure gradient,and there is a peak value of η,and there is an optimal velocity range.
关键词
水环输送/稳定性/计算流体力学/稠油
Key words
water annulus transportation/stability/computational fluid dynamics/heavy oil
维普
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