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Citation: KANG Wanli, LI Yuan, SHAN Xiuhua, FAN Haiming, CUI Wenhong, ZHANG Xin. Stability Dynamic Characteristics of Alkali/surfactant/polymer Flooding Crude Oil Emulsion[J]. Chinese Journal of Applied Chemistry, ;2012, 29(4): 428-433. doi: 10.3724/SP.J.1095.2012.00262 shu

Stability Dynamic Characteristics of Alkali/surfactant/polymer Flooding Crude Oil Emulsion

1.
EOR Center, China University of Petroleum, Qingdao 266555, China

Corresponding author: KANG Wanli,
Received Date: 17 June 2011
Available Online: 22 August 2011
Fund Project: 国家自然科学基金资助项目(20873181) (20873181)山东省自然科学基金资助项目(Y2008F20) (Y2008F20)山东省"泰山学者"建设工程项目(ts20070704) (ts20070704)

Stability dynamic characteristics of alkali/surfactant/polymer(ASP) flooding crude oil emulsion was studied using emulsion stability model based on two-phase separation.Effect of alkali/surfactant/polymer on dynamic characteristics of ASP flooding crude oil emulsion was also studied by analyzing oil film strength qualitatively and measuring oil-water interfacial tension.The results showed that Civan model was suitable to evaluate the stability of ASP flooding crude oil emulsion and thus the stability dynamic characteristics were obtained.The crude oil emulsions became more stable with the increase of alkali concentration firstly at low alkali concentration(<900 mg/L) and then less stable with the increasing alkali concentration at high alkali concentration(>900 mg/L).The stabilities of crude oil emulsions were improved with the increase of the concentrations of surfactant and polymer.The stability mechanism of ASP flooding W/O emulsion could be ascribed to the decrease of oil-water interfacial tensions when alkali and surfactant were used and increase of the oil-water interfacial strength when the polymer was added to the system.Therefore alkali,surfactant and polymer have synergistic effect.
- alkali/surfactant/polymer flooding,
- crude oil emulsion,
- dynamic characteristics,
- interfacial tension,
- oil film strength,
- stablility
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