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包括各向异性效应在内的地球介质中井孔的稳定性

D.古泼塔 M.塞门

D.古泼塔, M.塞门. 包括各向异性效应在内的地球介质中井孔的稳定性[J]. 应用数学和力学, 1999, 20(8): 783-802.
引用本文: D.古泼塔, M.塞门. 包括各向异性效应在内的地球介质中井孔的稳定性[J]. 应用数学和力学, 1999, 20(8): 783-802.

包括各向异性效应在内的地球介质中井孔的稳定性

详细信息
  • 中图分类号: TB122;TE21

  • 摘要: 为了研究地球介质中钻凿较深的斜井(这种井既受到内压又受到非静水应力场的作用),有必要发展一种分析表述方式.这种表述方式包括井孔周围应力的三维分析,并把它和井孔内压组合后,求出总应力分布的近似解.在实际现场条件下,井孔的取向、原地应力和岩层层面倾斜都可能是任意的.对井孔的拉伸破坏和剪切破坏都进行了研究.当井孔最小主应力超过拉伸强度时,出现拉伸破坏,这就是拉伸破坏准则.对剪切破坏而言,采用了各向异性材料的修正的Drucker-Prager破坏准则.为了研究材料的各向异性、岩层面倾斜度和原地应力对井孔稳定的影响,进行了参量研究.参量研究结果表明,井孔稳定性明显地受到井孔高倾斜度、材料高度各向异性、原地应力条件和岩层面高倾斜度的影响.文中也研究了弹塑性介质中井孔的稳定性问题.为了弄清井孔周围塑性区范围的大小和塑性区内的材料各向异性性质,利用弹性理论和塑性理论给出了数学公式.同时还研究了竖直井孔在静水压力作用下,地球介质是横观各向同性时的钻井情况.为此,也对地球介质的塑性性能受材料各向异性的影响进行了参量研究.结果指出,井孔周围的应力分布、塑性区域的大小和破坏压力都深受材料各向异性程度和原地超负荷应力值的影响.我们观察到,随着地球介质的各向异性程度增大,井孔的稳定性降低.
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出版历程
  • 收稿日期:  1997-11-22
  • 刊出日期:  1999-08-15

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