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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >Modeling of Hydraulic Fracture Propagation at the kISMET Site Using a Fully Coupled 3D Network-Flow and Quasi-Static Discrete Element Model
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Modeling of Hydraulic Fracture Propagation at the kISMET Site Using a Fully Coupled 3D Network-Flow and Quasi-Static Discrete Element Model

机译：使用完全耦合的3D网络流动和准静态离散元模型建模在KISMET站点的液压断裂传播

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Aimed at supporting the design of hydraulic fracturing experiments at the kISMET site, ～1500 m below ground in a deep mine, we performed pre-experimental hydraulic fracturing simulations in order to estimate the breakdown pressure, propagation pressure, fracture geometry, and the magnitude of induced seismicity using a newly developed fully coupled three-dimensional (3D) network flow and quasi-static discrete element model (DEM). The quasi-static DEM model, which is constructed by Delaunay tessellation of the rock volume, considers rock fabric heterogeneities by using the "disordered" DEM mesh and adding random perturbations to the stiffness and tensile/shear strengths of individual DEM elements and the elastic beams between them. A conjugate 3D flow network based on the DEM lattice is constructed to calculate the fluid flow in both the fracture and porous matrix. One distinctive advantage of the model is that fracturing is naturally described by the breakage of elastic beams between DEM elements. It is also extremely convenient to introduce mechanical anisotropy into the model by simply assigning orientation-dependent tensile/shear strengths to the elastic beams. In this paper, the 3D hydraulic fracturing model was verified against the analytic solution for a penny-shaped crack model. We applied the model to simulate fracture propagation from a vertical open borehole based on initial estimates of rock mechanical properties and in-situ stress conditions. The breakdown pressure and propagation pressure are directly obtained from the simulation. In addition, the released elastic strain energies of individual fracturing events were calculated and used as a conservative estimate for the magnitudes of the potential induced seismic activities associated with fracturing. The comparisons between model predictions and experimental results are still ongoing.
机译：旨在支持在Kismet部位的液压压裂实验设计，深入矿山〜1500米，我们进行了预先实验的水力压裂模拟，以估计击穿压力，传播压力，断裂几何形状和幅度使用新开发的全耦合三维（3D）网络流量和准静态离散元件模型（DEM）诱导地震性。通过使用“无序”的DEM网，通过使用“无序”的DEM网并向各个DEM元件和弹性梁的刚度和拉伸/剪切强度添加随机扰动来构成岩石体积构建的准静态DEM模型。它们之间。构建基于DEM格子的共轭3D流量网络以计算裂缝和多孔基质中的流体流动。该模型的一个独特优点是通过在DEM元件之间的弹性束的破裂自然地描述了压裂。通过简单地将取向依赖性的拉伸/剪切强度分配给弹性梁，将机械各向异性引入模型中也非常方便。在本文中，验证了3D液压压裂模型对一分钱裂纹模型的分析解决方案。我们将模型应用于基于岩石力学性能的初始估计和原位应力条件模拟垂直开放钻孔的断裂传播。击穿压力和传播压力直接从模拟中获得。此外，计算各个压裂事件的释放弹性应变能量，并用作保守估计与压裂相关的潜在诱导的地震活性的大小。模型预测和实验结果之间的比较仍在进行。

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