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Drag coefficient modification for proppant transport in fractures considering wall retardation
Chemical Engineering Research and Design ( IF 3.9 ) Pub Date : 2021-12-24 , DOI: 10.1016/j.cherd.2021.12.038
Hang-Yu Zhou 1 , Tao Zhang 1 , Jian-Chun Guo 1 , Kun Sun 2 , Ruo-Yu Yang 3
Affiliation  

Proppant transport is crucial in hydraulic fracturing, which determines fracture conductivity and well productivity. Proppant transport in hydraulic fractures is essentially the dense solid−liquid flow. Unlike the widely studied fluid-solid flow in chemical engineering and fluvial sediment transport, the motion of proppants (particles) will be significantly affected by walls of narrow channels such as fractures and slots, because the drag force is changed. This paper studies the wall-retardation effect on particle movement, and modified the drag coefficient for simulating liquid−solid flow in narrow-width fractures. Both experiments and simulations on proppant transport are conducted. The drag coefficient considering wall-retardation effect is modified by the Lattice Boltzmann method (LBM), and is integrated into OpenFOAM for two fluid method (TFM) numerical simulation. Experiment and simulation results show a good agreement, and the improved drag model is more advanced than the Gidaspow model in reproducing the movement characteristics of suspended particles in narrow channels. Compared to previous research outcomes about this topic, this work can efficiently improve the accuracy on proppant transport simulation and be widely applied in industrial numerical simulations.



中文翻译:

考虑壁面延迟的裂缝中支撑剂输运阻力系数修正

支撑剂输送在水力压裂中至关重要,它决定了裂缝的导流能力和井的产能。水力裂缝中的支撑剂输送本质上是稠密的固液流动。与化学工程和河流沉积物输送中广泛研究的流体-固体流动不同,支撑剂(颗粒)的运动将受到裂缝和狭缝等狭窄通道壁的显着影响,因为阻力发生了变化。本文研究了壁面延迟对颗粒运动的影响,并修改了阻力系数以模拟窄宽度裂缝中的液固流动。对支撑剂输送进行了实验和模拟。考虑壁面延迟效应的阻力系数通过格子玻尔兹曼方法(LBM)修改,并集成到 OpenFOAM 中,用于二流体法 (TFM) 数值模拟。实验与仿真结果吻合较好,改进后的阻力模型比Gidaspow模型更能再现狭窄通道中悬浮粒子的运动特性。与以往有关该课题的研究成果相比,该工作可以有效提高支撑剂运移模拟的准确性,并在工业数值模拟中得到广泛应用。

更新日期:2022-01-07
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