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首页> 外文期刊>Journal of natural gas science and engineering >Coupled flow-stress-damage simulation of deviated-wellbore fracturing in hard-rock
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Coupled flow-stress-damage simulation of deviated-wellbore fracturing in hard-rock

机译：硬岩偏井眼压裂的流应力-损伤耦合模拟

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In this study, the evolution of hydraulic fractures and micro-annuluses around wellbores was simulated using zero-thickness Pore Pressure Cohesive Elements (PPCE). A coupled flow-stress-damage (FSD) nonlinear finite element model which consists of deviated wellbore, perforation hole, micro-annulus, cement sheath and casing was established. The viscoelastic continuum damage induced by hydraulic fracturing is governed by the traction-separation law. Mohr-Coulomb law is used to determine the elastic and plastic behaviors of the cement sheath and surrounding rock. Numerical results show that micro-annulus propagates around the wellbore firstly, then it would gradually close. In addition, the sensitivities of rock parameters and in-situ stresses were also analyzed. It is found that, in the strike-slip stress regime, the width of fracture increases with the increasing deviated angle of wellbore. The fracture length increases with the increasing deviated angle of wellbore if the angle is smaller than 45 degrees. However, if the deviated angle is above 45 degrees, the fracture length decreases when the angle increases. When the bulk modulus is greater than 90 GPa, the fracture geometry keeps nearly unchanged. A higher Poisson's ratio increases the fracture propagation pressure and the in-situ stress differences can not effectively restrict the fracture height growth in hard formation. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项研究中，井壁周围的水力压裂和微环空的演化是使用零厚度的孔隙压力黏性单元（PPCE）模拟的。建立了由偏斜井眼，射孔，微环空，水泥护套和套管组成的流固耦合非线性有限元模型。水力压裂引起的粘弹性连续体破坏受牵引分离定律的控制。莫尔-库仑定律用于确定水泥护套和围岩的弹性和塑性行为。数值结果表明，微环隙首先在井眼周围传播，然后逐渐闭合。另外，还分析了岩石参数的敏感性和原位应力。发现在走滑应力状态下，裂缝宽度随着井眼偏角的增加而增加。如果角度小于45度，则裂缝长度随井眼偏斜角度的增加而增加。但是，如果偏离角度大于45度，则当角度增加时，断裂长度会减小。当体积模量大于90GPa时，断裂几何形状几乎保持不变。较高的泊松比增加了裂缝的传播压力，并且原位应力差不能有效地限制硬质层中裂缝高度的增长。 （C）2015 Elsevier B.V.保留所有权利。

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