摘要
孔喉尺度弹性微球的流变性质不同于其他驱油剂,为适应实际油藏的复杂条件,利用激光粒度分析仪研究了孔喉尺度弹性微球的粒径大小及分布,利用RheoStress600型旋转流变仪和M5600型流变仪分别测试了弹性微球的蠕变—恢复特性和不同频率、温度下粘性和弹性模量的变化规律,借助LVDV-II+Pro型旋转粘度计研究了质量分数、温度、剪切速率、矿化度对弹性微球溶液粘度的影响。结果表明,实验合成的弹性微球具有与油藏岩石匹配的微米级孔喉尺度特征,服从威布尔分布;具有良好的蠕变—恢复特性和粘弹性;在低温、低剪切速率下,弹性微球溶液为假塑性流体;在中剪切速率及高温、低剪切速率下,为膨胀性流体;在高剪切速率下,为近似牛顿流体。弹性微球溶液粘度较低,具有良好的流动性和调驱注入性,同时具有较好的稳定性,可用于高温、高盐油藏的深部调驱。
The particle size and size distribution of pore-scale elastic microspheres are studied through laser particle size analyzer; us-ing RheoStress600 rotary rheometer and M5600 rheometer, the creep-recovery property of elastic microspheres and their viscous modu-lus and elastic modulus variation at different frequency and temperature are tested respectively; through the LVDV-II+Pro rotating vis-cometer, the effect of concentration, temperature, shear rate, salinity on viscosity of elastic microspheres solution are studied. The re-sults show that the elastic microspheres synthesized in laboratory are micron pore-scale feature which matche with the reservoir rockand obey the Weibull distribution. They have better creep-recovery property and viscoelasticity; and the elastic microspheres solutionbehaves as a pseudoplastic liquid at low temperature and low shear rate condition, moreover, it behaves as an expansibility liquid atmiddle shear rate condition or high temperature and low shear rate condition, and shows similar Newtonian fluid feature at high shearrate condition; the viscosity of elastic microspheres solution is lower with good mobility and can be injected easily in the process of pro-file control and flooding; the elastic microspheres solution has better stability and can be used for high temperature and high salinityreservoirs to enhance oil recovery with good reservoir adaptability.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2014年第1期55-58,114,共4页
Petroleum Geology and Recovery Efficiency
基金
中央高校基本科研业务费专项资金"孔喉尺度弹性微球渗流机理的实验和模拟研究"(11CX06025A)
关键词
孔喉尺度弹性微球
粒径分布
蠕变一恢复特性
动态模量
粘度
深部调驱
pore-scale elastic microspheres
particle size distribution
creep-recovery property
dynamic modulus
viscosity
deep pro-file control
