富有机质页岩各向异性力学特性试验研究

发布时间：2018-06-22 03:07

  本文选题：页岩 + 各向异性　； 参考：《钻采工艺》2017年02期

【摘要】：为了研究层状页岩各向异性力学特性为工程应用提供依据,开展了页岩巴西劈裂试验和单轴、三轴压缩试验。研究结果表明,随着层理角度增加,层状页岩纵横波速均逐渐降低;页岩抗拉强度随着层理角度增加先降低后升高呈现出U型变化规律;θ=0°和θ=90°时页岩圆盘以直线形裂缝破坏为主,θ=45°时以曲线形裂缝为主;单轴压缩时应力-应变曲线为Ⅱ类曲线;θ=0°时为沿层理的拉伸劈裂破坏,θ=45°时以剪切滑移破坏为主,θ=90°时主要为剪切破坏;同一围压下随着层理角度升高,弹性模量仍逐渐降低,抗压强度仍呈现U型变化规律,泊松比变化较为离散;θ=0°时为共轭剪切破坏,θ=45°时主要为剪切滑移破坏,θ=90°时为贯穿层理的宏观剪切破裂面;弹性模量、泊松比各向异性指数随着围压增加呈升高趋势,抗压强度各向异性指数随着围压升高而降低。通过试验得到页岩5个独立弹性参数可为深入分析页岩地层的井壁稳定性、地应力及水力压裂等提供技术参考。
[Abstract]:In order to study the anisotropic mechanical properties of layered shale for engineering application, the Brazilian fracturing test and uniaxial and triaxial compression tests were carried out. The results show that the longitudinal and transverse wave velocities of layered shale decrease gradually with the increase of bedding angle. With the increase of bedding angle, the tensile strength of shale decreases first and then increases with the increase of bedding angle, and then increases with the increase of bedding angle, and the fracture failure of shale disc is mainly linear at 胃 0 掳and 胃 0 掳and 90 掳, and the curve fracture is dominant at 45 掳胃. Under uniaxial compression, the stress-strain curve is a class 鈪，

本文编号：2051293