粘弹性流体在盲端孔隙中的流场

Flow field of viscoelastic fluid in pores with dead ends

以带有盲孔的流道模拟油藏中的盲端孔隙 ,应用数值方法研究了上随体Maxwell流体在盲端孔隙中的流动特性。着重分析了流体流变性和盲端倾角对流场的影响规律。计算结果表明 ,驱替液的粘弹性是影响盲端波及效率的重要因素 ;在较大的盲端倾角范围内 ,低雷诺数(Re)流动条件下 ,流体的威森博格数 (We )越大 ,孔隙盲端中的流动区域越大 ,滞留区越小。

A flow channel with micro holes was used to model pores with dead ends in reservoir. By numerical method, flow of upper convected Maxwell fluid near the dead end was studied, and the influence of rheological property and obliquity between main channel and dead end on flow field was discussed. Numerical results show that viscoelasticity of displacing fluid is the main factor of sweep efficiency. Within a wide range of obliquity, at low Reynolds numbers (Re), with increasing Weissenberg number (We), flowing area is enlarged, and thus motionless area becomes smaller.