Hydraulic fracturing is an effective way to exploit hydrocarbons in tight oil reservoir. The success of this technique lies on the creation of high conductivity channels for the oil and gas. Quantitative analysis of factors influencing the conductivity of propped fractures is significant for the design of the operation schedule. According to the definition of sphericity, cylindrical and planar proppants of different sphericity and sizes were presented. And disordered packs of nonspherical proppants in fractures of different widths were established by the discrete element method. The change of the proppant embedment and fracture width under different closure pressures were analyzed by the solid mechanics. During the fracture deformation, the pressure and velocity of the fluid flowing in fractures were simulated by Lattice‐Boltzmann method. Based on that, the effect of the proppant size, sphericity, and the fracture width on the permeability and conductivity of hydraulic fractures were investigated. The accuracy of the model was verified by the experimental data. The simulation results show that the fracture permeability and conductivity decrease with the decrease in the rock's Young's modulus, proppant size, and sphericity, and their stress sensitivity increases with the decrease in the rock's Young's modulus and the increase in the proppant size. Increasing fracture width can improve fracture conductivity more significantly than increasing fracture permeability. The permeability and conductivity of the fractures filled cylindrical proppants are higher than that of the fractures filled with planar proppants.

中文翻译：

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致密油藏非球形支撑剂水力压裂裂缝的电导率分析

水力压裂是在致密油藏中开采碳氢化合物的有效途径。该技术的成功在于为石油和天然气创建高电导率通道。定量分析影响支撑裂缝电导率的因素对于设计手术计划具有重要意义。根据球形度的定义，提出了不同球形度和大小的圆柱支撑剂和平面支撑剂。通过离散元法建立了不同宽度裂缝中非球形支撑剂的无序堆积。通过固体力学分析了不同封闭压力下支撑剂埋深和裂缝宽度的变化。在裂缝变形过程中，通过Lattice-Boltzmann方法模拟了裂缝中流体流动的压力和速度。在此基础上，研究了支撑剂尺寸，球形度和裂缝宽度对水力压裂渗透率和电导率的影响。实验数据验证了模型的准确性。仿真结果表明，随着岩石杨氏模量，支撑剂粒径和球形度的减小，裂缝的渗透率和电导率降低；岩石杨氏模量减小，支撑剂粒径增大，其应力敏感性增大。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。研究了裂缝宽度对水力裂缝渗透率和电导率的影响。实验数据验证了模型的准确性。仿真结果表明，随着岩石杨氏模量，支撑剂粒径和球形度的减小，裂缝的渗透率和电导率降低；岩石杨氏模量减小，支撑剂粒径增大，其应力敏感性增大。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。研究了裂缝宽度对水力裂缝渗透率和电导率的影响。实验数据验证了模型的准确性。仿真结果表明，随着岩石杨氏模量，支撑剂粒径和球形度的减小，裂缝的渗透率和电导率降低；岩石杨氏模量减小，支撑剂粒径增大，其应力敏感性增大。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。实验数据验证了模型的准确性。仿真结果表明，随着岩石杨氏模量，支撑剂粒径和球形度的减小，裂缝的渗透率和电导率降低；岩石杨氏模量减小，支撑剂粒径增大，其应力敏感性增大。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。实验数据验证了模型的准确性。仿真结果表明，随着岩石杨氏模量，支撑剂粒径和球形度的减小，裂缝的渗透率和电导率降低；岩石杨氏模量减小，支撑剂粒径增大，其应力敏感性增大。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。它们的应力敏感性随着岩石的杨氏模量的减小和支撑剂尺寸的增加而增加。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。它们的应力敏感性随着岩石的杨氏模量的减小和支撑剂尺寸的增加而增加。与增加裂缝渗透率相比，增加裂缝宽度可以更明显地改善裂缝导流能力。填充有圆柱支撑剂的裂缝的渗透率和电导率高于填充有平面支撑剂的裂缝的渗透率和电导率。