Li M.,China University of Petroleum - East China |
Zhao N.,China University of Petroleum - East China |
Fang H.,Shengli Oilfield Engineering Design and Consulting Company Ltd |
Zong H.,Shengli Oilfield Engineering Design and Consulting Company Ltd |
And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2012
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°C 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.