摘要
建立考虑聚合物剪切变稀特性的聚驱试井数学模型,基于矩形网格和井筒周围径向加密的复合网格。采用有限体积方法求得数值解,将数值解与叠加原理得到的注聚井停注压降进行对比。结果表明:叠加原理计算得到的注聚井关井井底压力值远低于数值解,说明叠加原理不能用于聚合物驱试井解释。在实测注聚井压降资料解释中,叠加原理得到的渗透率明显偏低,进一步证明了叠加原理不适合非线性聚驱试井模型,数值方法更加适用于聚驱试井解释。研究结论适用于类似的非线性试井问题。
A mathematical model for pressure transient analysis in polymer-flooding system was established,in which the shear thinning effect of non-Newtonian polymer solution is considered.The governing equations were discretized by finite volume method with a hybrid grid consisting of Cartesian meshes with radial refinement around well positions.The shut-in pressures from numerical solution were compared with those obtained with the superposition principle method.It shows that shut-in bottom-hole pressure computed with superposition principle method is much lower than the numerical result for polymer-flooding system,which indicating that the superposition principle cannot be used for pressure transient analysis in polymer-flooding system.Shut-in pressure data of an injection well in a polymer-flooding system was interpreted.It is found that the permeability obtained with superposition principle method is very small,which shows that the superposition principle method cannot be used to solve the nonlinear model for pressure transient analysis in polymer-flooding system.The numerical method is more suitable for polymer-flooding system.The conclusions are applicable to similar nonlinear problems in pressure transient analysis.
作者
张佳
程时清
曾杨
张满
于海洋
ZHANG Jia;CHENG Shiqing;ZENG Yang;ZHANG Man;YU Haiyang(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China;CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《计算物理》
CSCD
北大核心
2021年第3期324-332,共9页
Chinese Journal of Computational Physics
基金
国家科技重大专项(2016ZX05025-003)
中国石油大学(北京)科研基金(2462020YXZZ028)
国家留学基金委(201906440163)资助项目
。
关键词
聚合物驱
非牛顿流体
叠加原理
数值解
关井压降
polymer-flooding
non-Newtonian fluid
superposition principle
numerical solution
shut-in pressure drawdown
