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首页> 外文期刊>Journal of natural gas science and engineering >Proppant placement in complex fracture geometries: A computational fluid dynamics study
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Proppant placement in complex fracture geometries: A computational fluid dynamics study

机译：复杂骨折几何形状中的支撑剂放置：计算流体动力学研究

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Proppant transport in activated natural fractures and induced secondary fractures has been increasingly receiving attention. However, the roughness and the non-planarity of hydraulic fractures violate the assumption of a constant flow path during the proppant transport. Therefore, we utilized a computational fluid dynamics (CFD) approach to study the pmppant transport in the complex fracture network while considering the non-planarity and the surface roughness. The fracturing fluid loaded with sands (proppant) is injected to the fracture at a synthesized field-guided pumping schedule. We used the Eulerian-Eulerian frame of the two-phase turbulent flow for modeling the transport processes of which are compared to the proppant transport experiments. The results reflect that our constructed model captures the essential transport mechanisms of the dispersed phase (proppant particles) with the help of the appropriate drag model. We also find that the surface roughness of the fracture deaccelerates the particle velocity during the early injection time, while the fracture non-planarity plays more essential role to the particle transport in the fracture than other geometrical and topographic factors. More importantly, we noticed that the propped fracture heights vary up to one fold with different secondary fracture orientations. This observation would potentially surprise the production performance diagnosis later on.
机译：活化天然骨折的支撑剂运输和诱导的二次骨折已经越来越受到关注。然而，液压骨折的粗糙度和非平坦性违反了支撑剂运输期间恒定流动路径的假设。因此，我们利用计算流体动力学（CFD）方法来研究复杂裂缝网络中的PMPPANT传输，同时考虑非平面性和表面粗糙度。装载有砂岩（支撑剂）的压裂液以合成的现场引导泵送时间表注射到骨折上。我们使用了两相湍流的Eulerian-eulerian框架，用于建模其与支撑剂运输实验相比的运输过程。结果反映了我们构造的模型在适当的阻力模型的帮助下捕获分散相（支链剂颗粒）的基本传输机制。我们还发现裂缝的表面粗糙度使得在早期注射时间期间颗粒速度，而裂缝非平面性在骨折中的颗粒输送比其他几何和地形因素在骨折中发挥更大的作用。更重要的是，我们注意到，额外的骨折高度变化直至具有不同的次级裂缝取向的折叠。此观察结果可能会让生产性能诊断稍后令人惊讶。

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