【作者】 孙传宗； 姜汉桥； 侯健；

【Author】 Sun Chuanzong~1,Jiang Hanqiao~1,Hou Jian~2 (1.Key Lab of Petroleum Engineering of the Ministry of Education,China University of Petroleum,Beijing 102249, P.R.China;2.School of Petroleum Engineering,China University of Petroleum,Dongying 257061,P.R.China)

【机构】 中国石油大学(北京)石油工程教育部重点实验室； 中国石油大学(华东)石油工程学院；

【摘要】 聚合物驱是提高原油采收率的一种重要方法。虽然已有的模型可以很好地描述聚合物溶液的宏观性质,但是由于多孔介质和非牛顿流体的双重复杂性,用传统方法很难准确地预测聚合物溶液在地下的流变性质。基于油-水两相孔隙网络模拟模型,综合考虑聚合物渗流机理(如增黏、扩散、吸附及剪切降解等)建立了聚合物驱微观模拟模型。推导了剪切稀释流体在单管模型中有效黏度的表达式,将原来的求解非线性问题简化为求解线性问题。通过微观模拟,统计分析了聚合物驱后剩余油的微观分布规律;研究了聚合物驱结束时滞留聚合物分布规律及其影响因素。计算结果表明,聚合物驱后网络状剩余油体积比例明显减少,但油水混合状、孤粒/孤滴状、斑块状剩余油体积比例都有所提高。在模拟条件下,聚合物在多孔介质中的滞留量占聚合物注入总量的一半以上,孔喉半径和形状因子为主要影响因素。更多还原

【Abstract】 Polymer Flooding is an important method for enhanced oil recovery.Although the bulk behaviour of the polymer solution are well understood and characterized using established models,conventional methods can not predict the in-situ behaviour of the polymer solution because of the double complexities of the porous media and Non-Newtonain fluid. Based on oil-water two-phase pore network simulation model,the microscopic simulation model for polymer flooding was provided together with polymer seepage mechanism(tackifying,diffusion,adsorption,retention,shear degradation). The original nonlinear problem was simplified as linear problem by the derivation of the effective viscosity formula of the shear-thinning fluid in a capillary.Through the microscopic simulation,laws of remaining oil after polymer flooding are statistically analyzed.On the basis,laws of distribution of retained polymer and its influence factors are studied. Microscopic simulation showed that the retained oil of network shape decreased significantly while the volume ratio of single grain/island shape,fleck shape and oil-water mixed shape increased.Under simulated conditions,the retained polymer account for more than half of the injected polymer.Pore radius and shape factors are the main influencing factors.更多还原