Fracturing fluid filtration loss is a significant research topic related to fracture propagation, formation damage and the cost of hydraulic fracturing. To reduce the loss, nanoparticles have been used to enhance the fracturing fluid properties such as viscosity and well-building ability. In this work, silica nanoparticles (NPs) with different concentrations (0, 0.01, 0.03 wt%) were added into the viscoelastic surfactant (VES) fluid composed of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal). A micro pore-throat structure was applied to investigate the flow characteristics of those three fracturing fluids with Deborah numbers (De) spanning from 1.52 to 73.2, and a Newtonian fluid was set as the control group. It was found that the flow patterns of VES solutions performed as the convergent flow similar to those of the Newtonian fluid at upstream, and turned into divergent flow with the gathering of streamlines at downstream. Surprisingly, the flow characteristics between VES solution with no nanoparticles and nanoparticle-enhanced the VES solution showed an insignificant difference with high flow rates (5 and 20 ml/h). The nanoparticle was unable to enhance or influence the properties of VES fluid when flowing through convergence–divergence and divergence–convergence structure. Neither the breakage nor the recombination of wormlike micellar were barely affected by the nanoparticle.

压裂液的过滤损失是与裂缝扩展，地层破坏和水力压裂成本有关的重要研究课题。为了减少损失，已使用纳米颗粒来增强压裂液性能，例如粘度和增井能力。在这项工作中，将不同浓度（0、0.01、0.03 wt％）的二氧化硅纳米颗粒（NPs）添加到由十六烷基三甲基溴化铵（CTAB）和水杨酸钠（NaSal）组成的粘弹性表面活性剂（VES）流体中。应用微孔喉结构研究了三种具有Deborah数（De）的范围从1.52到73.2，并以牛顿流体作为对照组。发现VES溶液的流型表现为与上游的牛顿流体相似的会聚流，并随着下游流线的聚集而变成发散流。出人意料的是，无纳米颗粒的VES溶液与纳米颗粒增强的VES溶液之间的流动特性在高流速（5和20 ml / h）下显示出不明显的差异。当流过会聚-发散和发散-会聚结构时，纳米粒子无法增强或影响VES流体的性能。纳米颗粒几乎不影响蠕虫状胶束的破裂或重组。