水溶性降黏剂和油溶性降黏剂对油水界面膜的影响

Effect of Water-soluble Viscosity Reducer and Oil-soluble Viscosity Reducer on the Interfacial Film

丁慧 丁俐 宗倩宇 李美蓉

DING Hui DING Li ZONG Qianyu LI Meirong

为揭示水溶性和油溶性降黏剂对采出液破乳脱水的影响，研究了聚氧乙烯醚型水溶性降黏剂（SH）和不饱和酸酯聚合物型油溶性降黏剂（SL）对胜利油田陈庄稠油采出液破乳的影响，通过扩张流变法和扫描电镜从界面膜角度分析了两种降黏剂对稠油采出液稳定性的影响机理。结果表明，SH浓度由0 增至3 g/L 时，采出液油水界面扩张模量由20.09 mN/m降至3.02 mN/m，脱水率由47.62%增至66.67%，界面黏性模量和弹性模量降低，相角由18.43o增至29.43o，SH分子可增大沥青质之间及胶质与沥青质之间的距离，使界面膜强度减小。SL 浓度由0增至3 g/L 时，油水界面扩张模量由20.09 mN/m增至34.76 mN/m，脱水率由47.62%降至6.80%，界面黏性模量降低的同时弹性模量增加，相角由18.43o降至9.83o，SL可增强沥青质分子之间的相互作用，沥青质表面呈现“鱼鳞”形状的规则排布，结构紧密，界面膜强度增强。SH有利于稠油采出液破乳脱水，而SL不利于稠油采出液破乳脱水。图12 参14

In order to reveal the effect of water-soluble viscosity reducer and oil-soluble viscosity reducer on the demulsification and dehydration of heavy oil produced fluid，the effects of polyoxyethylene ether water-soluble viscosity reducer（SH）and unsaturated ester polymer oil-soluble viscosity reducer（SL）on the demulsification of Chenzhuang heavy oil produced fluid in Shengli oilfield were investigated. The influence mechanism of SH and SL on the stability of heavy oil produced fluid were studied through interfacial films by interfacial dilational rheology method and scanning electron microscope. The results showed that when the concentration of SH increased from 0 to 3 g/L，the oil-water interfacial dilational modulus reduced from 20.09 mN/m to 3.02 mN/m， the dehydration rate increased from 47.62% to 66.67%，interfacial viscous modulus and elastic modulus decreased simultaneously， and the phase angle increased from 18.43o to 29.43o. SH molecules could increase the distance between asphaltenes and between colloid and asphaltene，and reduce the intensity of interfacial film. When the concentration of SL increased from 0 to 3 g/L，the interfacial dilational modulus increased from 20.09 mN/m to 34.76 mN/m，the dehydration rate decreased from 47.62% to 6.08%， interfacial viscous modulus decreased while elastic modulus increased，and the phase angle decreased from 18.43o to 9.83o. SL could enhance the interaction between asphaltene molecules which led to bituminous surface render a rule configuration with shape of “scales”，structure compact and interfacial film strength enhance. SH was good for heavy oil demulsification dehydration，on the contraty，SL was bad for heavy oil demulsification dehydration.

10.19346/j.cnki.1000-4092.2016.03.030