化学降黏剂对稠油采出液破乳的影响

采用Turbiscan稳定性分析仪建立评价方法，考察了3种乳化降黏剂和7种油溶性降黏剂对塔河稠油采出液破乳的影响。结果表明，3种乳化降黏剂均不利于采出液破乳，而7种油溶性降黏剂对破乳无负面影响，THY-3甚至明显促进破乳。通过研究乳化降黏剂性能与破乳影响间的关系发现，THS-1降黏率可达95.35%，形成的乳液液滴分布均匀且粒径最小，并能显著增加油水界面Zeta电位，稳定性最好，降黏效果最佳，但对于采出液破乳影响最大；THS-2降黏率只有82.58%，影响最小，说明乳化降黏剂对破乳的影响程度与其降黏性能密切相关。

INFLUENCE OF CHEMICAL VISCOSITY REDUCERS ON THE DEMULSIFICATION OF HEAVY OIL PRODUCED FLUIDS

A method for evaluating the stability of crude emulsion system was established based on Turbiscan stability analyzer and the influence of chemical viscosity reducers, including three water-soluble one and seven oil-soluble one, on the demulsification of Tahe oilfield produced fluids was studied. Test results indicated that all these three water-soluble viscosity reducers showed negative effect on demulsification, yet oil-soluble one did not show negative effect, in which THY-3 even showed significant positive effect on demulsification. It was found that the influence of water-soluble viscosity reducer on the demulsification of oilfield produced fluid was depended on its viscosity reduction performance, e.g. THS-1 viscosity reducer exhibited the best viscosity reduction performance with a reduction rate of 95.35%, it could improve the stability of crude emulsion significantly, at the same time, its negative effect on demulsification was also significant; the viscosity reduction rate of THS-2 was 82.58% and it showed less negative effect on demulsification of oilfield produced fluid.