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首页> 外文期刊>Mathematical Problems in Engineering >Deformation Behavior between Hydraulic and Natural Fractures Using Fully Coupled Hydromechanical Model with XFEM
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Deformation Behavior between Hydraulic and Natural Fractures Using Fully Coupled Hydromechanical Model with XFEM

机译：基于XFEM的全耦合水力模型在水力与自然裂缝之间的变形行为

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摘要

There has been a growing consensus that preexisting natural fractures play an important role during stimulation. A novel fully coupled hydromechanical model using extended finite element method is proposed. This directly coupled scheme avoids the cumbersome process during calculating the fluid pressure in complicated fracture networks and translating into an equivalent nodal force. Numerical examples are presented to simulate the hydraulic fracture propagation paths for simultaneous multifracture treatments with properly using the stress shadow effects for horizontal wells and to reveal the deformation response and interaction mechanism between hydraulic induced fracture and nonintersected natural fractures at orthotropic and nonorthotropic angles. With the stress shadoweffects, the induced hydraulic flexural fracture deflecting towellbore rather than transverse fracturewould be formed during the progress of simultaneous fracturing for a horizontal well. The coupled hydromechanical simulation reveals that the adjacent section to the intersection is opened and the others are closed for orthogonal natural fracture, while the nonorthogonal natural fracture is activated near the intersection firstly and along the whole section with increasing perturbed stresses. The results imply that the induced hydraulic fracture tends to cross orthotropic natural fracture, while it is prior to being arrested by the nonorthotropic natural fracture.
机译：越来越多的共识认为，预先存在的天然裂缝在增产过程中起着重要的作用。提出了一种使用扩展有限元方法的新型全耦合水力模型。这种直接耦合方案避免了在计算复杂裂缝网络中的流体压力并将其转化为等效节点力时的繁琐过程。给出了算例，通过适当利用水平井的应力阴影效应，模拟了同时进行多裂缝处理的水力裂缝传播路径，并揭示了正交各向异性和非正交各向异性角度下水力诱导裂缝与非相交自然裂缝之间的变形响应和相互作用机理。利用应力阴影效应，在水平井同时压裂的过程中，将引起向水孔而不是横向裂缝偏转的水力弯曲裂缝。耦合的流体力学模拟表明，对于正交自然裂缝，相交的相邻断面是开放的，而对于正交自然裂缝则是闭合的，而非正交自然裂缝首先是在交点附近并且在整个断面处随着扰动应力的增加而被激活。结果表明，诱发的水力压裂趋向于穿过正交各向异性的自然裂缝，而先于非正交各向异性的自然裂缝被阻止。

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  • 来源
    《Mathematical Problems in Engineering》 |2017年第6期|6373957.1-6373957.12|共12页
  • 作者

    Liu Fei; Luo Zhifeng; Sang Yu; Zhao Liqiang; Zhou Changlin;

  • 作者单位

    PetroChina, Southwest Oil & Gas Field Co, Engn Technol Res Inst, Chengdu 610017, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China;

    PetroChina, Southwest Oil & Gas Field Co, Engn Technol Res Inst, Chengdu 610017, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China;

    PetroChina, Southwest Oil & Gas Field Co, Engn Technol Res Inst, Chengdu 610017, Peoples R China;

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