清洁压裂液携带作用下支撑剂运移铺置规律研究
Study on proppant migration and placement under sand-carrying action of clean fracturing fluid
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摘要: 为探究在清洁压裂液携带下支撑剂运移铺置的规律，基于计算流体力学（CFD），通过FLUENT数值模拟软件建立了欧拉多相流模型，模型考虑了压裂液流变性以及支撑剂颗粒的摩擦、碰撞；以平衡高度、平衡时间作为表征参数，研究了支撑剂粒径、密度和砂比对砂堤形态的影响。结果表明：清洁压裂液相比于常规压裂液，更易将支撑剂携带至裂缝深处，使支撑剂均匀铺置在裂缝中；在清洁压裂液的携带下，大粒径、高密度的支撑剂容易在裂缝口沉降，而小粒径、低密度支撑剂有助于提高压裂液的携砂能力将支撑剂向裂缝深处运输，在一定范围内增加砂比能提高砂堤高度和铺置区域，但过量的砂比对支撑剂砂堤形态影响甚微并且容易造成砂堵。Abstract: In order to explore the law of proppant migration and placement under clean fracturing fluid, an Euler multiphase flow model was established through FLUENT numerical simulation software based on computational fluid dynamics（ＣＦD）. The model takes into account the rheological properties of fracturing fluid and the friction and collision of proppant particles. The influence of proppant size, density and sand ratio on the shape of the sand dike is studied by using the equilibrium height and equilibrium time as the characterization parameters. The results show that the clean fracturing fluid is easier to carry the proppant to the depth of the fracture than the conventional fracturing fluid, so that the proppant is evenly distributed in the fracture; proppant with large particle size and high density can easily settle in the fracture opening under the carrying of the clean fracturing fluid, while proppant with small particle size and low density can improve the sand carrying capacity of fracturing fluid and transport proppant into deep fracture. Increasing sand ratio in a certain range can improve the height and laying area of the sand dike, but excessive sand ratio has little effect on the shape of the proppant sand dike and is easy to cause sand blockage.
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