渤海S油田聚合物驱采出液油水界面膜的稳定性分析*

Stability Analysis of Polymer Flooding Produced Fluid Interface Membrane in Bohai S Oilfield

刘义刚 谢良波 赵 鹏 韩玉贵 宋 鑫 李 壮 韩志鹏 刘 园 李 轶

LIU Yigang XIE Liangbo ZHAO Peng HAN Yugui SONG Xin LI Zhuang HAN Zhipeng LIU Yuan LI Yi

为了明晰渤海S油田聚合物驱采出液油水界面膜稳定性的影响因素，通过对乳状液油水界面流变性、Zeta电位和界面张力等性质的表征，评价了聚合物类型、疏水缔合聚合物质量浓度和水相矿化度对原油乳状液稳定性的影响。研究表明：相对于线性聚合物，疏水缔合聚合物对于渤海S油田的原油乳状液具有明显的增稠、增黏效果，能够明显改变油水界面电性，增加油水界面活性，增强油水界面膜强度，具有更好的原油乳状液稳定效果。同时，疏水缔合聚合物的质量浓度与乳状液的界面膜弹性呈线性关系，随着聚合物质量浓度从0 mg/L增加至800 mg/L，乳状液的界面膜弹性从4 Pa增加到17 Pa。当聚合物质量浓度增至400 mg/L时，聚合物在油水界面上的吸附接近饱和。水相矿化度对原油乳状液的稳定性也有较大的影响，当矿化度在0~ 9417.7 mg/L时，乳状液的稳定性主要受界面电性的影响；当水相矿化度在9417.7~ 18835.4 mg/L时，乳状液的稳定性主要受油水界面膜结构强度的影响。图12参17

In order to clarify the influencing factors of oil-water interfacial film stability of polymer flooding produced liquid in Bohai S oilfield，the influence of polymer type，mass concentration of hydrophobic associating polymer and salinity of aqueous phase on thestability of crude oil emulsion was evaluated by the characterizations of oil-water interfacial rheology，Zeta potential and interfacial tension. The results showed that compared with linear polymer，hydrophobic associating polymer had obvious thickening and viscosifying effect on crude oil emulsion in BoHai S oilfield，which could significantly change the oil-water interface electrical property，increase the oil-water interface activity，enhance the strength of oil-water interface membrane，and had better emulsion stability. At the same time，there was a linear correlation between the concentration of hydrophobic associating polymer and the interfacial membrane elasticity of the emulsion. With the increase of the polymer concentration from 0 mg/L to 800 mg/L，the interfacial membrane elasticity of the emulsion increased from 4 Pa to 17 Pa. When the mass concentration of polymer increased up to 400 mg/L，the adsorption of the polymer at the oil-water interface was close to saturation. The water phase salinity also had a great influence on the stability of crude oil emulsion. When the salinity was 0—9417.7 mg/L，the stability of the emulsion was mainly affected by the electrical properties of the interface；while when the salinity of aqueous phase was 9417.7 — 18，835.4 mg/L，the stability of emulsion was mainly affected by the structural strength of oil-water interface membrane.

10.19346/j.cnki.1000-4092.2020.01.025