超亲水表面强化水环输送重油过程效果及模拟

Enhancement of water-annular heavy oil transportation by superhydrophilic surface and its simulation

重油黏度大、流动性差、输送成本高,水环输送是实现重油输送减阻的有效方案,但油水间的密度差导致水环易失稳。为此,引入超亲水表面用于提高管道内水环稳定性,降低重油输送阻力,并通过数值模拟与实验相结合的方法对超亲水表面强化重油效果进行验证,分析了不同因素对油水流动以及水环输送过程中油水分布、管道压降的影响。研究结果表明:对于水环输送重油体系,超亲水表面可提高水环稳定性,有明显的减阻效果;引入超亲水表面后,相比普通管道水环运输白油,可有效减阻17.49%以上,最高减阻率达50.15%,强化率为10.71%~39.09%;相比纯油输送白油,可减阻72.02%~78.21%。利用超亲水表面强化水环输送过程效果显著,具有广阔的应用前景,可有效提升水环重油输送技术的适用性。

In view of the high viscosity,poor fluidity and high transportation cost of heavy oil,water-annular transportation is an effective solution to realize the flow drag reduction during heavy oil transportation,but the large density difference between oil and water leads to the instability of water annular.For this reason,a superhydrophilic surface is introduced to improve the stability of the water annular in the pipeline and reduce the transportation resistance of heavy oil.Besides,the enhancement of heavy oil transportation by superhydrophilic surface was verified through numerical simulation and experiments in combination.Meanwhile,the effect of various factors on oil-water flow,oil-water distribution and pressure drop in pipelines during water-annular transportation were analyzed.The research results show that the superhydrophilic surface could improve the stability of water annular in the water-annular transportation system of heavy oil,with the obvious effect of flow drag reduction.Compared with the water-annular white oil transportation by ordinary pipeline,the flow drag reduction of over 17.49%can be realized,the maximum flow drag reduction is up to 50.15%,and the enhancement is within 9.06%‒39.09%after the superhydrophilic surface is introduced.Compared with the white oil transportation without water annular,the flow drag reduction can reach 72.02%‒78.21%.Generally,the superhydrophilic surface could significantly enhance water-annular heavy oil transportation with promising application prospects,capable of effectively improving the applicability of water-annular heavy oil transportation technology.(16 Figures,32 References)