射孔完井近井地带聚合物溶液剪切降黏规律研究  

Study on shear thinning of polymer solution in near wellbore zone of perforation completion

作　　者：陈涛平[1] 孙文 CHEN Taoping;SUN Wen(Enhanced Oil and Gas Recovery Key Laboratory of Ministry of Education(Northeast Petroleum University),Daqing,Heilongjiang 163318,China;Petrochina Huabei Oilfield Company Oil Gas Technology Research Institute,Renqiu,Hebei 062552,China)

机构地区：[1]提高油气采收率教育部重点实验室(东北石油大学),黑龙江大庆163318 [2]中国石油华北油田油气工艺研究院,河北任丘062552

出　　处：《中国科技论文》2024年第9期962-968,共7页China Sciencepaper

基　　金：“十三五”国家科技重大专项(2017ZX05009-004)。

摘　　要：为了确定射孔完井近井地带聚合物溶液剪切降黏规律,应用等效剪切控制体物理模型,研究注入强度、聚合物溶液浓度、聚合物相对分子质量、渗流距离等对聚合物溶液剪切降黏规律的影响。结果表明,聚合物溶液的无量纲视黏度(实测值与初始值之比)随渗流距离的增加整体呈对数递减,聚合物溶液流经射孔完井近井地带时,其黏度损失主要发生在射孔孔壁附近。通过对实验数据的拟合,得出真实反映无量纲视黏度与渗流距离内在客观规律的关系式,揭示出剪切降解造成的聚合物溶液黏度损失的大小是由渗流过程中能量损失(压降)的大小决定的,该拟合关系式也可用于剪切作用下油层远处聚合物溶液黏度的预测。The effects of different factors on the shear thinning of polymer solution was studied based on the equivalent control body physical model to determine the shear viscosity reduction rule of polymer solution near perforation completion.Specifically,factors such as the injection intensity,the polymer solution concentration,the polymer molecular weight and the seepage distance were stud⁃ied.The experimental results show that the dimensionless apparent viscosity(the ratio of measured value to initial value)decreases logarithmically with the increase of seepage distance.When the polymer solution flows through the near wellbore zone of the perfora⁃tion completion,the viscosity loss occurs mainly near the perforation wall.Through fitting of experimental data,the relation formula between dimensionless apparent viscosity and flow in porous media distance was achieved,which can reflect the objective law truly.It is revealed that the viscosity loss of polymer solution caused by shear degradation is determined by the energy loss(pressure drop)in the process of flow in porous media.The fitting equation can also be employed in the prediction of the polymer solution viscosity under shearing in the distant reservoir.

关 键 词：射孔完井 近井地带 聚合物溶液 剪切降黏 渗流规律 

分 类 号：TE343[石油与天然气工程—油气田开发工程]