摘要
为了探究复合体系各组分(碱、表面活性剂、聚合物)对油水界面剪切粘弹性的影响规律,利用Physica MCR301型流变仪测量了不同化学驱油体系与原油的界面剪切粘弹性。结果表明,原油和去离子水可以形成较坚固的界面膜,有较高的界面剪切粘弹性;少量表面活性剂(如质量浓度为100 mg/L)的加入就会大幅度降低油水界面剪切粘弹性,在考察的质量浓度范围内,表面活性剂溶液的质量浓度越大,界面剪切粘弹性越低,在较高的质量浓度(如3 000 mg/L)和较高的振荡角频率(如1 rad/s)下,界面储能模量超出仪器测量下限;碱会严重破坏油水界面膜,使界面的损耗模量大幅度降低,界面的储能模量超出仪器测量下限,但是有机碱对界面膜的伤害要小于无机碱;聚合物的加入也会对油水界面剪切粘弹性产生影响,形成的界面膜抗剪切性能减弱。
Physica MCR301 rheometer was used to measure interfacial shear viscoelasticity between different chemical flooding systems and crude oil in order to explore effects of components in combination system(alkali,surfactant,polymer)on oil-water interfacial shear viscoelasticity. The results show that rigid interfacial film can be formed between crude oil and deionized water with high interfacial shear viscoelasticity. Small amounts of surfactant(like mass concentration of 100mg/L)will significantly reduce interfacial viscoelasticity of crude oil and water. Within the examined mass concentration of the surfactant,higher concentration of the surfactant brings lower interfacial shear viscoelasticity of the interfacial film. Under the condition of high mass concentration of the surfactant(like 3 000 mg/L)and high oscillation angular frequency(like 1 rad/s),interfacial storage modulus exceeds the lower limit of the instrument. Alkali may cause serious damage to the interfacial film. Interfacial loss modulus of lye-oil system are far less than that of water-oil system and interfacial storage modulus of the lye-oil system is too small to be tested,but the damage of organic base on the interfacial film is smaller than that of inorganic base. Polymer will increase the oil-water interfacial viscoelasticity,but the interfacial film can be destroyed easily.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2015年第1期68-73,共6页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"油田开采后期提高采收率技术"(2011ZX05009-004)
关键词
界面剪切粘弹性
界面膜
表面活性剂
碱
聚合物
interfacial shear viscoelasticity
interfacial film
surfactant
alkali
polymer
