摘要
在相同黏度情况下,黏弹性聚合物溶液和无弹性甘油溶液的驱油效率不同,用宏观力不能解释驱油效率产生差别的原因,因此应分析弹性驱替液和无弹性驱替液作用在残余油上的微观力的变化以及对驱油效率的影响。通过理论分析和可视化驱油试验,计算了弹性驱替液和无弹性驱替液在简化孔隙模型中的流线和速度,分析了由速度和流线变化引起的微观力的变化及其对残余油的作用,用可视化岩心模型给出了不同黏弹性流体的驱油效果。结果表明,微观力不改变宏观压力梯度,且微观力主要作用在不同类型残余油的突出部分,引起了突出部分的形状变化和运移。
At the same viscosity, the oil displacement efficiency of viscoelastic polymer solution is different from that of glyc- erin solution without elasticity, and the difference couht not be explained by macro forces. Therefore, the changes of micro forces acting on residual oil by driving fluids with and without elasticity and the eft^ct of driving fluids properties on oil dis- placement efficiency were analyzed. The streamlines and velocity of the fluids with and without elasticity flowing in simplified pore models were mathematically simulated through theoretical analysis and visual oil displacement experiment. The micro force variation with velocity and streamline and its effect on residual oil were analyzed, and the oil displacement efficiencies of different viscoelastic fluids were obtained by visual core model. The results show that the micro force does not change the macro pressure gradient, and mainly acts on the protrudent portion of different types of residual oils and causes its shape change and migration.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第4期150-155,160,共7页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家'973'重点基础研究发展计划项目(2005CB221300)
国家科技重大专项(2008ZX05009-004-01)
关键词
化学驱
黏弹性驱替液
微观力
残余油
chemical flooding
viscoelastic driving fluid
micro force
residual oil
