摘要
针对油藏孔隙中黏弹性流体的流动特性,选取了黏弹性流体中的上随体Maxwell本构方程描述以第一法向应力差为主要特征的聚合物溶液的流变性,同时使用计算流体有限元分析软件Polyflow对收缩流道内的黏弹性聚合物溶液流动过程进行等温数值模拟分析。从理论上研究了不同雷诺数(Re)和韦森博格数(We)条件下聚合物溶液黏弹性对孔隙内速度场和应力场的影响规律。确定当Re数和We数较大时,流体在收缩流道中流动时,流体的流速和应力随韦森博格数的增大而增大;第一法向应力随We的增大而增大,且在出口窄流道内最大,而在入口宽流道处最小;越靠近壁面,We数对第一法向应力的影响越大;黏弹性对流速的影响在靠近中心线处较大,靠近壁面处影响较小。
In accordance with the flow behavior of viscoelastic fluid in reservoir pores,up-Maxwell constitutional equation is selected to describe the rheological property of polymer solution with the first normal stress contrast as its main feature,and finite element analysis software Polyflow is used to perform isothermal numerical simulation for the flow behavior of viscoelastic polymer solution in shrinkage flowpath.The influence of polymer solution viscoelasticity on velocity and stress fields is studied theoretically under different Reynolds number(Re)and Weissenberg(We).It is defined that when Re and We are larger and fluid is flowing in shrinkage flowpath,flow velocity and stress will increase with the increasing of We;the first normal stress increases with the increasing of We,being maximum in the narrow flowpath at outlet but minimum in the wide flowpath at inlet;the closer to wall surface,the bigger the influence of We on the first normal stress is;the viscoelasticity exerts bigger influence on flow velocity near central line,and less influence near wall surface.
出处
《特种油气藏》
CAS
CSCD
2007年第5期70-72,87,共4页
Special Oil & Gas Reservoirs
基金
973国家重点基础研究资助项目"宏观及微观化学驱物理化学非线性渗流室内实验及渗流规律研究"(项目编号:2005cb221304)
