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页岩储层各向异性对水平井坍塌压力的影响

张明明 梁利喜 刘向君

张明明, 梁利喜, 刘向君. 页岩储层各向异性对水平井坍塌压力的影响[J]. 应用数学和力学, 2017, 38(3): 295-309. doi: 10.21656/1000-0887.370155
引用本文: 张明明, 梁利喜, 刘向君. 页岩储层各向异性对水平井坍塌压力的影响[J]. 应用数学和力学, 2017, 38(3): 295-309. doi: 10.21656/1000-0887.370155
ZHANG Ming-ming, LIANG Li-xi, LIU Xiang-jun. Impacts of Rock Anisotropy on Horizontal Wellbore Stability in Shale Reservoir[J]. Applied Mathematics and Mechanics, 2017, 38(3): 295-309. doi: 10.21656/1000-0887.370155
Citation: ZHANG Ming-ming, LIANG Li-xi, LIU Xiang-jun. Impacts of Rock Anisotropy on Horizontal Wellbore Stability in Shale Reservoir[J]. Applied Mathematics and Mechanics, 2017, 38(3): 295-309. doi: 10.21656/1000-0887.370155

页岩储层各向异性对水平井坍塌压力的影响

doi: 10.21656/1000-0887.370155
基金项目: 国家自然科学基金石油化工联合基金重点支持项目(U1262209);国家自然科学基金(51274172);四川省应用基础研究计划项目(2014JY0092)
详细信息
    作者简介:

    张明明(1991— ),男,硕士生(E-mail: zhangm_ing@qq.com);梁利喜(1976—),男,讲师(通讯作者. E-mail: liangzby@163.com).

  • 中图分类号: TE243+.1

Impacts of Rock Anisotropy on Horizontal Wellbore Stability in Shale Reservoir

Funds: The National Natural Science Foundation of China(51274172)
  • 摘要: 为揭示层理页岩强度各向异性对水平井井壁坍塌压力的影响规律,对取自四川盆地龙马溪组页岩钻井不同层理角度的岩芯,通过岩芯观测、偏光显微镜、扫描电镜试验分别从宏观和微观角度研究了页岩层理特征,并基于单轴抗压强度研究了页岩强度各向异性特征.层理结构发育导致页岩呈现出显著的各向异性特征,粗略地将页岩视为各向同性体及简单采用Mohr-Coulomb准则作为破坏判据,使得预测的维持井壁稳定的坍塌压力不能满足安全钻井的需要.该文在研究层理地层岩石力学特性的基础上,采用横观各向同性地层井周应力分析模型,研究了弹性模量及地应力各向异性比对井周应力的影响;并结合考虑中间主应力的Mogi-Coulomb判据,分析了井壁坍塌压力对弹性模量E和Poisson(泊松)比ν各向异性比值变化的敏感性.实例分析结果表明:弹性模量和水平地应力各向异性比值的变化会对井周应力产生较大影响;Poisson比各向异性对井壁坍塌压力没有明显影响,而弹性模量比值的变化对井壁坍塌压力影响较大;横观各向同性地层中井壁坍塌压力与储层水平和垂直方向的硬脆性强弱关系有关,弹性力学参数各向异性既有可能利于井壁稳定,也可能更易导致井壁的剪切破坏;在实际工程中应根据储层岩石水平和垂直方向的硬脆性强弱关系,确定安全钻井液密度窗口.该结果对现场施工具有很好的指导意义.
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出版历程
  • 收稿日期:  2016-05-18
  • 修回日期:  2016-10-09
  • 刊出日期:  2017-03-15

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