套管水泥环组合应力计算边界条件分析

李国庆

李国庆. 套管水泥环组合应力计算边界条件分析[J]. 石油钻探技术, 2012, 40(2): 20-24. DOI: 10.3969/j.issn.1001-0890.2012.02.004
引用本文: 李国庆. 套管水泥环组合应力计算边界条件分析[J]. 石油钻探技术, 2012, 40(2): 20-24. DOI: 10.3969/j.issn.1001-0890.2012.02.004
Li Guoqing. Analysis of Boundary Condition of Stress Calculation on Casing/Cement-Sheath[J]. Petroleum Drilling Techniques, 2012, 40(2): 20-24. DOI: 10.3969/j.issn.1001-0890.2012.02.004
Citation: Li Guoqing. Analysis of Boundary Condition of Stress Calculation on Casing/Cement-Sheath[J]. Petroleum Drilling Techniques, 2012, 40(2): 20-24. DOI: 10.3969/j.issn.1001-0890.2012.02.004

套管水泥环组合应力计算边界条件分析

详细信息
    作者简介:

    李国庆(1959-),男,黑龙江齐齐哈尔人,1982年毕业于大庆石油学院钻井工程专业,2009年获中国地质大学(北京)地质工程专业博士学位,总工程师,高级工程师,主要从事油气井工艺理论方面的研究。联系方式(0459)4891544。

  • 中图分类号: TE21

Analysis of Boundary Condition of Stress Calculation on Casing/Cement-Sheath

  • 摘要: 合理的套管应力计算是套管柱强度设计和套管损坏判别的依据。目前常用计算套管应力的方法是将非均匀地应力作用于已经形成的套管水泥环组合体之上,再根据计算结果进行套管应力及变形分析,而实际上非均匀地应力所引起的应力集中效应在固井之前已经在井壁岩石处释放,并不能作用到套管水泥环组合体之上。在非均匀地应力作用下一般形成椭圆形井眼,水泥凝固之前井壁岩石在非均匀地应力和井内液柱压力的作用下已经达到平衡,套管与水泥环组合不需要承担由非均匀地应力所产生的载荷,短期内套管水泥环组合承受均匀的液柱压力;油田长期开发过程中由于地层岩石具有流变性,逐渐将部分甚至全部垂向地应力转嫁到套管水泥环组合体之上,使其承受均匀地应力的作用,从而造成套管被挤扁和缩径。非均匀地应力形成的椭圆形水泥环改变了套管柱周向应力分布,但并不能将非均匀地应力作为套管水泥环应力计算的边界条件。
    Abstract: Reasonable calculation of casing stress is the basis for design of casing string strength and for judging whether casing failure happened.At present,the common method of casing stress calculation is to apply the non-uniform in-situ stress to the casing/cement-sheath.Then according to the calculation results,casing string stress and deformation are analyzed,but in fact,stress concentration effect caused by non-uniform in-situ stress is already released on sidewall rock before well cementation,and can not be applied to casing/cement-sheath.Usually an oval hole is formed on the effect of non-uniform in-situ stress,the sidewall rock already reaches balance under the effect of non-uniform in-situ stress and fluid pressure before cement setting,so the load caused by non-uniform in-situ stress is not taken by casing/cement-sheath,and in short period uniform stress of salt water column is taken by casing/cement-sheath.In the long period development of oilfield,due to rheological property of formation rock,some even all of vertical crustal stress will be taken forward to casing/cement-sheath,then casing/cement-sheath will take the effect of uniform crustal stress,what is the main reason for casing collapse and necking down.The circumferential stress distribution is changed by oval cement sheath which is formed by non-uniform in-situ stress.But non-uniform in-situ stress cannot be concerned as the boundary condition of stress calculation on casing/cement-sheath.
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出版历程
  • 收稿日期:  2010-03-07
  • 修回日期:  2012-02-12
  • 刊出日期:  1899-12-31

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