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Continuum Damage Modeling of Hydraulic Fracture from Perforations in Horizontal Wells

机译：水平井穿孔水力骨折的连续损伤模型

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摘要

The perforations play an important role in determining the near-wellbore fracture geometry during the stimulation phase. To address the impact of perforations on fracture geometry in horizontal wells, a 3D coupled hydromechanical finite element model is developed and employed. Based on the theory of continuum damage mechanics, scalar damage variable governs the degradation of the stiffness of the solid. Damage affects the crack element modeling that is used to consider crack behavior and construct a crack-tracking algorithm to simulate propagation. The model was validated against the analytical solutions and perforation fracture experiments. The results indicate that perforation can be used to control the fracturing pressure and propagation behavior of the initial fracture, which has a further effect on the fracture geometry of near-wellbore region in horizontal wells. Optimizing perforation parameters can direct the propagation of the initial fracture toward the preferred fracture plane. The results demonstrate an improved capability to depict the 3D near-wellbore fracture geometry and fracture propagation with a continuum damage model. The model enables the optimization of orientations and perforation parameters, so that most efficient perforating completions can be designed for hydraulic fracture stimulation.
机译：穿孔在刺激阶段确定近井筒断裂几何形状方面发挥着重要作用。为了解决穿孔对水平孔中断裂几何形状的影响，开发并采用了3D耦合的流体机械有限元模型。基于连续损伤力学理论，标量损伤变量控制固体刚度的劣化。损坏会影响用于考虑裂缝行为的裂缝元素建模并构建裂缝跟踪算法来模拟传播。该模型针对分析解决方案和穿孔骨折实验进行了验证。结果表明穿孔可用于控制初始骨折的压裂压力和繁殖行为，这对水平孔中近井眼区的裂缝几何形状有进一步影响。优化穿孔参数可以将初始断裂朝向优选的断裂面的传播指导。结果证明了描述近井眼骨折几何形状和与连续损伤模型的裂缝传播的改进能力。该模型能够优化方向和穿孔参数，从而设计最有效的穿孔完成，以设计用于液压断裂刺激。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第12期|9304961.1-9304961.12|共12页
  • 作者

    Sun Feng; Jia Peng; Xue Shifeng;

  • 作者单位

    China Univ Petr Coll Pipeline & Civil Engn Qingdao Shandong Peoples R China;

    China Univ Petr Coll Pipeline & Civil Engn Qingdao Shandong Peoples R China;

    China Univ Petr Coll Pipeline & Civil Engn Qingdao Shandong Peoples R China;

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