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水平井多裂纹同步扩展的偏折分析

陈旻炜 李敏 陈伟民

陈旻炜, 李敏, 陈伟民等 . 水平井多裂纹同步扩展的偏折分析[J]. 北京航空航天大学学报, 2019, 45(1): 99-108. doi: 10.13700/j.bh.1001-5965.2018.0255
引用本文: 陈旻炜, 李敏, 陈伟民等 . 水平井多裂纹同步扩展的偏折分析[J]. 北京航空航天大学学报, 2019, 45(1): 99-108. doi: 10.13700/j.bh.1001-5965.2018.0255
CHEN Minwei, LI Min, CHEN Weiminet al. Deflection of multi-crack synchronous propagation in horizontal well[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(1): 99-108. doi: 10.13700/j.bh.1001-5965.2018.0255(in Chinese)
Citation: CHEN Minwei, LI Min, CHEN Weiminet al. Deflection of multi-crack synchronous propagation in horizontal well[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(1): 99-108. doi: 10.13700/j.bh.1001-5965.2018.0255(in Chinese)

水平井多裂纹同步扩展的偏折分析

doi: 10.13700/j.bh.1001-5965.2018.0255
基金项目: 

国家自然科学基金 11232012

国家自然科学基金 11372320

详细信息
    作者简介:

    陈旻炜  男, 博士研究生。主要研究方向:断裂力学、水力压裂、裂纹扩展

    李敏  男, 博士, 教授, 博士生导师。主要研究方向:压电驱动器气动弹性应用、结构非线性气动弹性分析与控制、固体力学计算分析

    陈伟民  女, 博士, 研究员, 博士生导师。主要研究方向:流固耦合、结构动力学

    通讯作者:

    陈伟民, E-mail: wmchen@imech.ac.cn

  • 中图分类号: O346.1

Deflection of multi-crack synchronous propagation in horizontal well

Funds: 

National Natural Science Foundation of China 11232012

National Natural Science Foundation of China 11372320

More Information
  • 摘要:

    水平井压裂技术是近几年油气工业发展起来的新技术,用于提高油气井的产量。然而在裂纹扩展的过程中,裂尖决定了裂纹的起裂与扩展方向,这会直接影响储层的压裂效果,所以人们对于这项技术还需要更进一步的认识。根据裂尖的应力场特性建立了裂尖权函数,能较准确地描述裂尖的应力状态,判断裂纹的扩展方向。在利用网格重剖分方法并结合最大主应力准则对水平井多裂纹扩展进行分析的基础上,通过裂尖权函数方法分析了水压裂纹在应力差、裂纹数目和裂纹间距等条件下产生偏折的原因。最终结果表明,裂纹在开裂时裂尖处xy方向的等效应力变化不明显,裂纹的偏折主要与裂尖xy方向的等效应力有关。

     

  • 图 1  裂尖附近单元及高斯点分布图

    Figure 1.  Distribution diagram of element and Gauss point near crack tip

    图 2  Ⅰ型裂尖附近的应力误差云图

    Figure 2.  Error contour of stresses near model-Ⅰ crack tip

    图 3  Ⅱ型裂尖附近的应力误差云图

    Figure 3.  Error contour of stresses near model-Ⅱ crack tip

    图 4  角度与距离函数曲线

    Figure 4.  Curves of angle and distance function

    图 5  裂纹路径误差示意图

    Figure 5.  Schematic of crack path error

    图 6  带孔板边缘多裂纹扩展的模型示意图

    Figure 6.  Schematic of model of multiple edge cracks propagation of hole plate

    图 7  不同方法的开裂路径对比(算例1)

    Figure 7.  Comparison of crack path among different methods (Example 1)

    图 8  四点弯曲梁试件模型

    Figure 8.  Model of 4-point bending beam specimen

    图 9  不同方法的开裂路径对比(算例2)

    Figure 9.  Comparison of crack path among different methods (Example 2)

    图 10  有限元模型示意图

    Figure 10.  Schematic of finite element model

    图 11  有限元网格模型

    Figure 11.  Mesh of finite element model

    图 12  不同间长比条件下裂纹扩展路径

    Figure 12.  Crack propagation path under different RSL

    图 13  不同间长比条件下裂尖等效应力随裂纹数目的变化情况

    Figure 13.  Variation of equivalent stress at crack tip with crack number under different RSL

    图 14  不同裂纹数目条件下裂尖等效应力随间长比的变化情况

    Figure 14.  Variation of equivalent stress at crack tip with RSL under different crack numbers

    图 15  不同裂纹数目条件下裂纹偏折角度与水压随间长比的变化情况

    Figure 15.  Variation of deflection angle and hydraulic pressure with RSL under different crack numbers

    图 16  不同应力差条件下的裂纹扩展路径

    Figure 16.  Crack propagation path under different stress contrast

    图 17  不同裂纹数目条件下裂尖等效应力随应力差的变化情况

    Figure 17.  Variation of equivalent stress at crack tip with stress contrast under different crack numbers

    图 18  不同裂纹数目条件下裂尖偏折角度与水压随应力差的变化情况

    Figure 18.  Variation of deflection angle and hydraulic pressure at crack tip with stress contrast under different crack numbers

    不同系数n下带孔板边缘的裂纹扩展对比

    Comparison of edge crack propagation of hole plate under different coefficient n

    不同系数n下四点弯曲梁试件模型的裂纹扩展对比

    Crack propagation comparison of 4-point bending beam specimen under different coefficient n

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出版历程
  • 收稿日期:  2018-05-04
  • 录用日期:  2018-07-27
  • 网络出版日期:  2019-01-20

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