A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field
A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field
复制标题
大庆油田段西油藏三元复合驱聚合物分子量与储层渗透率匹配关系研究
DOI：
10.3390/en10070951
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发表时间：
2017-07-01
期刊：
影响因子：
3.2
通讯作者：
Song, Kaoping
中科院分区：
文献类型：
--
作者：
Huang, Bin;Zhang, Wei;Song, Kaoping
为了确定三元复合驱（碱/表面活性剂/聚合物）中聚合物分子量与油藏渗透率的匹配关系，进行了多个不同聚合物分子量的岩心驱替实验。得到了压差与注入孔隙体积倍数关系的两类曲线，一类描述了岩心堵塞特征，另一类描述了注入井特征。利用聚合物分子回旋半径与孔喉半径的关系来描述聚合物分子量与岩心渗透率的关系。结果表明，当孔喉半径（$r_h$）与聚合物分子回旋半径（$r_p$）之比大于7时，注入各种分子量的三元复合体系不会堵塞；反之，当该比值小于7时，岩心会堵塞。岩心的水渗透率范围由聚合物分子量的值决定。三元复合体系的孔喉半径（$r_h$）与聚合物分子回旋半径（$r_p$）之比大于聚合物体系（$r_h/r_p = 5$）。利用扫描电子显微镜（SEM）对比了聚合物溶液和三元复合溶液中聚合物分子的形态，结果表明三元复合溶液中聚合物分子线圈的尺寸小于聚合物溶液中的尺寸，这是由碱和表面活性剂的双重作用导致的。
In order to determine the matching relationship of polymer molecular weight and reservoir permeability in ASP (alkaline/surfactant/polymer) flooding, a number of core flooding experiments with different polymer molecular weights are performed. Two types of curves for the relationship between the pressure difference and the injection pore volume multiples are obtained. One describes the characteristics of the core plugging; the other describes the characteristics of the injection well. The relationship between the polymer molecular cyclotron radius and the pore throat radius used to describe the relationship between the polymer molecular weight and the core permeability. The results indicate that when the ratio of the pore throat radius (rh) to the polymer molecular cyclotron radius (rp) is greater than 7, the injection of ASP system with a variety of molecular weights will not be blocked; on contrary, when the ratio is less than 7, the core will be blocked. The range of water permeability of the core is determined by the value of the polymer molecular weight. The ratio between the pore throat radius (rh) to the polymer molecular cyclotron radius (rp) for the ASP system is greater than that of polymer system (rh/rp = 5). A scanning electron microscope (SEM) is used to compare the morphology of polymer molecules in polymer solution and ASP solution, and shows that the dimension of polymer molecular coils in ASP solution is smaller than that in polymer solution, which is caused by the double effect of alkali and surfactant.