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首页> 外文会议>Offshore Technology Conference >Interaction between Proppant Packing, Reservoir Depletion, and Fluid Flow in Hydraulic Fractures
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Interaction between Proppant Packing, Reservoir Depletion, and Fluid Flow in Hydraulic Fractures

机译：支撑包装，储层耗尽与液压裂缝中流体流动之间的相互作用

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Understanding of proppant transport and deposition patterns in a hydraulic fracture is vital for effective and economical production of petroleum hydrocarbons. In this research, a numerical modeling approach, combining Particle Flow Code (PFC) with single-/multiphase lattice Boltzmann (LB) simulation, was adopted to advance the understanding of the interaction between reservoir depletion, proppant particle compression, and single-/multiphase flow in a hydraulic fracture. PFC was used to simulate effective stress increase and the resultant proppant particle movement and rearrangement during the process of reservoir depletion due to hydrocarbon production. The pore structure of the proppant pack was extracted and used as boundary conditions of the LB simulation to calculate the time-dependent permeability of the proppant pack. We first validated the PFC-LB numerical workflow, and the simulated proppant pack permeabilities as functions of effective stress were in good agreement with laboratory measurements. Furthermore, three proppant packs with the same average diameter but different diameter distributions were generated. Specifically, we used the coefficient of variation (COV) of diameter, defined as the ratio of standard deviation of diameter to mean diameter, to characterize the heterogeneity of particle size. We obtained proppant pack porosity, permeability, and fracture width reduction (compressed distance) as functions of effective stress. Under the same effective stress, a proppant pack with a higher diameter COV had lower porosity and permeability and larger fracture width reduction. This was because the high diameter COV gave rise to a wider diameter distribution of proppant particles; smaller particles were compressed into the pore space between larger particles with the increasing stress, leading to larger compressed distance and lower porosity and permeability. Using multiphase LB simulation.
机译：对液压骨折的支撑剂运输和沉积图案的理解对于石油烃的有效和经济生产至关重要。在该研究中，采用了一种数值建模方法，将粒子流量代码（PFC）与单/多相晶格Boltzmann（LB）模拟相结合，以推动储层耗竭，支撑剂颗粒压缩和单/多相之间的相互作用的理解流动液压骨折。 PFC用于模拟由于烃生产储层耗尽过程中的有效应力增加和所得的支撑剂颗粒运动和重排。提取支撑包装的孔结构并用作LB模拟的边界条件，以计算支撑剂包的时间依赖性渗透性。我们首先验证了PFC-LB数值工作流程，并且模拟的支撑剂包装渗透率与有效压力的功能与实验室测量有关。此外，产生了具有相同平均直径但不同直径分布的三个支撑剂包。具体地，我们使用直径的变异系数（COV），定义为直径与平均直径的标准偏差的比率，以表征粒径的异质性。我们获得了支撑剂包装孔隙率，渗透性和断裂宽度（压缩距离）作为有效应力的功能。在相同的有效应力下，具有较高直径CoV的支撑剂包装具有较低的孔隙率和渗透性，并且较大的裂缝宽度降低。这是因为高直径CoV产生了宽直径的支撑剂颗粒的分布;将较小的颗粒压缩到较大的颗粒之间的较大颗粒之间的孔隙空间中，导致压缩距离和较低的孔隙率和渗透性。使用多相LB仿真。

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