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各向异性地层中井孔周围应力场的研究

A STUDY ON THE STRESS FIELD AROUND A BOREHOLE IN ANISOTROPIC FORMATION

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【作者】 崔杰焦永树曹维勇蔡宗熙

【Author】 CUI Jie1,3,JIAO Yong-shu2,CAO Wei-yong3,CAI Zong-xi4(1.College of Geo-Resources and Information in China University of Petroleum,Dongying,Shandong 257061,China; 2.School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China; 3.Drilling Technology Research Institute,Shengli Oilfield,Dongying 257017,China; 4.Department of Mechanics,Tianjin University,Tianjin 300072,China)

【机构】 中国石油大学资源与信息学院胜利油田钻井工艺研究院河北工业大学机械工程学院天津大学力学系

【摘要】 由于问题的复杂性,在以往研究井壁稳定性的文献中,大多将地层介质简化为各向同性的。该文基于各向异性弹性理论,利用复变函数方法,建立了各向异性地层中倾斜井孔周围应力场的计算模型,得到了能够反映地层各向异性性质、地层倾向和走向、井斜角和方位角、井孔液柱压力、原始地应力方位和原始地应力比等多种因素影响的井孔周围应力场的解析表达式,以应力等值线云图表示的计算结果在一定程度上可以预测井壁开裂或坍塌的位置、范围、深度乃至坍塌后井孔的形状,为各向异性地层中井壁的稳定性分析和井孔轨道的优化设计提供了更切合工程实际的理论依据。

【Abstract】 Because of the complexity of the problem,most of the studies on borehole stability simplify the geologic medium as isotropic.Based on the theory of anisotropic elasticity,this paper established a model to calculate the stress distribution around an inclined borehole in anisotropic formation by means of complex function method.The analytical expressions for the stress field are formulated which can reflect the influences of the formation anisotropy,the bedding plane inclination and orientation,the borehole deviation and azimuth angles,the pressure of the drilling slurry,the direction and the ratio of the in-situ stresses.The stress contour maps obtained can be used to estimate the position,the extent,the depth and even the shape of fractured or collapsed borehole.The formulation might provide a more realistic basis of theory for analyzing the stability of the wellbore and optimizing the well trajectory in anisotropic formation.

【基金】 国家863项目(2006AA06A109)
  • 【文献出处】 工程力学 ,Engineering Mechanics , 编辑部邮箱 ,2011年07期
  • 【分类号】TE21
  • 【被引频次】21
  • 【下载频次】469
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