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力学与实践 ›› 2008, Vol. 30 ›› Issue (1): 66-69.doi: 10.6052/1000-0992-2007-261

• 应用研究 • 上一篇    下一篇

注蒸汽井套管应力的数值计算与工业应用

余中红 刘大伟 王立洋 郑之初   

  1. 中国科学院力学研究所
  • 收稿日期:2007-06-12 修回日期:1900-01-01 出版日期:2008-02-08 发布日期:2008-02-08

NUMERICAL SIMULATION AND INDUSTRIAL APPLICATION OF THE PRODUCTION CASING STESS INSIDE STEAM-INJECTION WELLS

  • Received:2007-06-12 Revised:1900-01-01 Online:2008-02-08 Published:2008-02-08

摘要: 在注蒸汽吞吐井的井筒应力模型中引入井筒温度场,利用ANSYS软件对不同约束条件下井筒 的应力场进行了计算. 结果表明,最大热应力发生在套管内壁,超过了N80套管的弹性屈服 极限,最大热膨胀发生在温度过渡区. 当套管周围掏空时,热应变远大于材料的弹性极限应 变,是诱发热采井套管变形损坏的主要原因. 为此提出了相应的套管损坏防治措施,在油田 现场采用厚壁合金钢TP120TH套管完井,试验结果验证了防治措施的有效性.

Abstract: The production casing stress inside steam-injection wells is analyzed with a casing temperature field. The commercial software, ANSYS, is used to simulate the casing stress under different conditions, and the results indicate that the highest thermal stress is at the internal wall, exceeding the elastic yield ultimate stress of N80 casing, while the maximum thermal expansion occurs in the temperature-transition area. In case that the surrounding area of casings is emptied, the thermal strain will be much higher than the elastic strain limit, and should be mainly responsible for the deformation failure of casings. Based on the results, some preventive measures for casing deformation are proposed, which are verified through the application of TP120TH casings during the well completion in Liao'he oilfield.