Yu Xiaoxi, Li Yuan, Liu Yuquan, Yang Yuping, Wu Yining
School of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Polymers (Basel). 2019 Aug 2;11(8):1291. doi: 10.3390/polym11081291.
Viscoelastic surfactant (VES) fluid and hydrolyzed polyacryamide (HPAM) solution are two of the most common fracturing fluids used in the hydraulic fracturing development of unconventional reservoirs. The filtration of fracturing fluids in porous media is mainly determined by the flow patterns in pore-throat structures. In this paper, three different microdevices analogue of porous media allow access to a large range of Deborah number (De) and concomitantly low Reynolds number (Re). Continuous pore-throat structures were applied to study the feedback effect of downstream structure on upstream flow of VES fluid and HPAM solution with Deborah (De) number from 1.11 to 146.4. In the infinite straight channel, flow patterns between VES fluids and HPAM solution were similar. However, as pore length shortened to 800 μm, flow field of VES fluid exhibited the triangle shape with double-peaks velocity patterns. The flow field of HPAM solution presented stable and centralized streamlines when was larger than 4.29 × 10. Additionally, when the pore length was further shortened to 400 μm, double-peaks velocity patterns were vanished for VES fluid and the stable convergent flow characteristic of HPAM solution was observed with all flow rates.
粘弹性表面活性剂（VES）流体和水解聚丙烯酰胺（HPAM）溶液是非常规油藏水力压裂开发中最常用的两种压裂液。压裂液在多孔介质中的滤失主要由孔喉结构中的流动模式决定。本文通过三种不同的多孔介质微器件模拟，可获得大范围的德博拉数（De）以及相应较低的雷诺数（Re）。采用连续孔喉结构研究了德博拉数（De）为1.11至146.4时，VES流体和HPAM溶液下游结构对上游流动的反馈作用。在无限长直通道中，VES流体和HPAM溶液的流动模式相似。然而，当孔长度缩短至800μm时，VES流体的流场呈现出具有双峰速度模式的三角形。当大于4.29×10时，HPAM溶液的流场呈现出稳定且集中的流线。此外，当孔长度进一步缩短至400μm时，VES流体的双峰速度模式消失，并且在所有流速下均观察到HPAM溶液稳定的收敛流动特性。
