表征化学驱采出液稳定性不同指标的关联性

Relevance Between Characterization Indices of the Stability of Chemical Flooding Produced Fluid

研究了聚合物、石油磺酸盐及二元复合驱作为驱油剂对孤岛油田采出的原油乳状液稳定性的影响,考察用不同指标表征乳状液稳定性的关联性。结果表明,在60℃、破乳剂TA1031质量浓度为100mg/L时,随各种驱油剂质量浓度的增大,原油乳状液破乳脱水率降低,120min时脱水率由高到低的原油乳状液体系的顺序为石油磺酸盐体系、聚合物体系、二元复合驱体系,对应的稳定性评分SV值逐渐增大,体系的静态稳定性逐渐增强;对应的破乳后水相Zeta电位绝对值、电导率由大到小的顺序为二元复合驱体系、聚合物体系、石油磺酸盐体系;水相中的油滴中值粒径由大到小的顺序为石油磺酸盐体系、聚合物体系、二元复合驱体系。水相的Zeta电位值越负、电导率越高、水中油滴中值粒径越小,原油乳状液的稳定性越强,脱水率也越低,表明表征化学驱采出液稳定性的各指标具有很好的关联性。

The influence of petroleum sulfonate,polymer and polymer/surfonate system as oil displacement agent on the stability of chemical flooding produced fluids and the relevance between the characterization indices were studied.The result indicated that when the concentration of demulsifier TA1031 was 100 mg/L,the dehydration rate of crude oil emulsion at 60℃ was decreased with the increase of the chemical agent concentration in it.The descending order of dehydration rate after 120 minutes was the crude oil emulsion with petroleum sulfonate,the crude oil emulsion with polymer,the crude oil emulsion with polymer/sulfonate system,and the corresponding SV value increased,meaning the static stability of emulsion being strengthened.The descending orders of Zeta potential absolute value and conductivity value of the water phase after crude oil emulsion demulsification both were those of polymer/surfactant system,polymer system,petroleum sulfonate system.And the descending order of the median size of oil droplets in the water phase after crude oil emulsion demulsification was those of petroleum sulfonate system,polymer system,polymer/surfactant system.The more negative the Zeta potential,the higher the conductivity and the smaller the median size of oil droplets in the water phase are,the more stable the crude oil emulsion is.Therefore,there is the relevance between characterization indices of the stability of chemical flooding produced fluid.