聚合物滞留特性对化学驱提高采收率的影响

发布时间：2018-03-22 16:53

  本文选题：聚合物　切入点：甘油　出处：《大庆石油地质与开发》2016年03期 　论文类型：期刊论文

【摘要】：为了揭示聚合物驱油机理和驱油剂黏度大小与聚合物驱采收率增幅间关系,在"等黏"和"等浓"条件下测试了聚合物和甘油溶液增黏性、流变性、黏弹性和渗流特性,并在均质和非均质岩心上开展了"等黏"甘油和聚合物溶液驱替效果以及它们注入先后顺序对驱替效果影响实验研究。结果表明,随浓度增大,甘油和聚合物溶液黏度都增加,但聚合物增黏能力远强于甘油。随剪切速率增加,甘油溶液视黏度保持恒定,聚合物溶液视黏度降低,表明前者为牛顿流体,后者为非牛顿流体。在"等黏"条件下,甘油和聚合物溶液阻力系数相差不大,但残余阻力系数相差很大,表明甘油在多孔介质内滞留能力很差。在"等黏"条件下,"先聚合物后甘油"比"先甘油后聚合物"注入方式增油效果好,表明驱油剂在高渗透层内滞留由此引起渗流阻力增加、全井注入压力升高是促使液流转向中低渗透层的动力源泉,也是聚合物驱提高采收率的主要机理和聚驱过程中发生"剖面反转"的根本原因。
[Abstract]:In order to reveal the relationship between polymer flooding mechanism and oil displacement viscosity and the increase of polymer flooding oil recovery, the viscosity enhancement, rheology, viscoelasticity and percolation characteristics of polymer and glycerol solution were tested under the condition of "equal viscosity" and "equal concentration". Experiments were carried out on homogeneous and heterogeneous cores to study the effect of "iso-viscosity" glycerol and polymer solution displacement and the sequence of their injection on the displacement effect. The results show that the viscosity of glycerol and polymer solution increases with the increase of concentration. With the increase of shear rate, the apparent viscosity of glycerol solution keeps constant, and the apparent viscosity of polymer solution decreases, indicating that the former is Newtonian fluid and the latter is non-Newtonian fluid. The resistance coefficient of glycerol and polymer solution is not different, but the residual resistance coefficient is very different. The results show that the retention ability of glycerol in porous media is very poor. Under the condition of "iso-viscosity", the injection of "first polymer then glycerol" is better than that of "glycerol after polymer" injection. The results show that the retention of oil displacement agent in high permeability layer will result in the increase of seepage resistance, and the increase of injection pressure in the whole well is the power source for the liquid flow to turn to the middle and low permeability zone. It is also the main mechanism of polymer flooding to improve oil recovery and the fundamental cause of profile reversal during polymer flooding.
【作者单位】： 东北石油大学提高油气采收率教育部重点实验室;大庆头台油田开发有限责任公司;
【基金】：国家自然科学基金项目“抗盐型聚合物油藏适应性及其改进方法基础研究”(51574086)资助
【分类号】：TE357.46
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本文编号：1649542