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首页> 外文期刊>Engineering Fracture Mechanics >Numerical investigation of the interactions between hydraulic fracture and bedding planes with non-orthogonal approach angle
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Numerical investigation of the interactions between hydraulic fracture and bedding planes with non-orthogonal approach angle

机译：非正交接近角度液压断裂与床上用品相互作用的数值研究

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Weak bedding planes (interfaces), a critical factor in determining the fracture height growth and the propagation pathway of the fractures, is pervasively distributed in the unconventional reservoirs. In the real world, multi-layered bedding planes, regarded as frictional discontinuities, are not horizontally distributed in the formation. In this paper, a three-dimensional fracture model, based on the three-dimensional displacement discontinuity method, was developed to simulate the interactions between vertical/slanted hydraulic fractures and frictional discontinuities (such as natural fractures or horizontal/oblique bedding plane segments) with non-orthogonal approach angle. Comparison of width profiles between the developed fracture model and Abaqus simulator showed a good agreement. In the case studies, width profiles and shear displacement discontinuity along the interface were analyzed under the influence of approach angle, ratio of distance between the injection source and interface to the fracture height, fluid pressure, Young’s modulus and Poisson’s ratio. A positive relation exists between shear sliding along the interface and approach angle, which conforms to the numerical experiments from the three-dimensional Discrete Element Method model. Interface location from the injection source has unconspicuous impact on the interface opening and shear sliding along the interface with non-orthogonal approach angle. The increment of fluid pressure makes alteration of vertical fracture more apparently in the non-orthogonal case. Smaller Young’s modulus makes the interface easier to be opened in the orthogonal case. This model enables to calculate fracture width distribution at the intersection area, which provides a guideline for proppant transport and avoid potential bridging and screen-out of the proppant.
机译：弱床上用品平面（界面），确定骨折高度生长和裂缝的传播途径的关键因素，在非传统的储层中被普及。在现实世界中，多层床上用品平面被视为摩擦不连续性，不会在地层中水平分布。在本文中，开发了一种基于三维位移不连续方法的三维裂缝模型，以模拟垂直/倾斜液压骨折和摩擦不连续性（如自然骨折或水平/倾斜床上用品区段）之间的相互作用非正交接近角度。发达的骨折模型与ABAQUS模拟器之间的宽度分布的比较显示了良好的一致性。在研究中，在接近角度，注射源与裂缝高度，流体压力，杨氏模量和泊松比的接近的影响下，分析了沿界面的宽度曲线和剪切位移不连续性。沿界面的剪切滑动与接近角度之间存在正关系，其符合来自三维离散元件模型的数值实验。来自喷射源的界面位置对沿着具有非正交接近角度的界面的界面打开和剪切滑动对界面打开和剪切滑动具有不合意的影响。流体压力的增量在非正交情况下更明显地改变垂直骨折。较小的杨氏模量使界面更容易在正交情况下打开。该型号可以在交叉点计算的裂缝宽度分布，该裂缝宽度分布为支撑剂运输提供指南，并避免潜在的桥接和屏幕从支撑剂中脱离。

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