聚丙烯酰胺溶液的地下流变特征  

The Rheological Behavior of Hydrolixed Partially Polyacrylamide (HPAM) Solutions in Reservoir,

作　　者：陈铁龙[1] 蒲万芬[1] 彭克宗[1] 叶仲斌[1] 

机构地区：[1]西南石油学院石油工程系

出　　处：《西南石油学院学报》1997年第3期28-34,共7页Journal of Southwest Petroleum Institute

基　　金：国家"八五"重点攻关项目

摘　　要：通过室内物理模拟方法，利用岩心流动实验装置，研究了不同分子量、浓度的聚合物溶液通过不同渗透率的多孔介质流变特性。实验结果显示聚丙烯酰胺溶液在多孔介质中呈现剪切变稀主剪切增稠的双重流变特性，其临界流速随分子量、浓度的增加而减小，随渗透率增大而增大。在剪切增稠区，流变性满足幂律模型，而且流变行为指数仅仅是聚合物本身性质参数的函数，而与渗透率无关。这一结果认为在聚合物驱的注入井附近地带将导致附加压降，影响聚合物的注入性能。The in-situ rheological behavior of HPAM solutions is an important input requirement of reservoir simulation of polymer flooding and governs the performance and economics of the process. The rheological behavior of hydrolized partially polyacrylamide(HPAM) solutions in reservoir core samples was investigated at 70℃. Using core-flow tests the effective viscosity of HPAM solutions in core with permeabilities of 0.024 to 1.252(m was determined and compared with bulk viscosity of the solutions for a wide range of concentrations(400-1200ppm) and molecular weights(9×10￣19×10). The effective viscosity of the solutions is composed of the individual contributions of shear viscosity and extensional viscosity. The extensional viscosity was obtained by comparing the shear viscosity measured in rotational viscosimeter with the effective viscosity in cores.The experimental results indicate that shear viscosity governs the flow behavior at low flow rates.However when a critical rate is attained,extensional viscosity becomes dominant. The shear viscosity in core samples can be well predicated by capillary bundle model. The extensional viscosity is a exponential function of the apparent shear rates in cores. The extensional viscosity increases with the increasing of molecular weight and concentration of the HPAM solutions,and with the decreasing of permeability of core samples.

关 键 词：流变性 实验室试验 聚丙烯酰胺溶液 聚合物驱油 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]