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| Casing loads distribution with non-uniform in-situ stresses in creep stratum |
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WANG U-jun1,YU Yong-nan2,U Jian1,HONG Tao1,WEN Tao1,CHEN Hai-yang1
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(1. Qingdao Campus Planning and Construction Administrative Office in China University of Petroleum,Qingdao 266555, Shandong Province，China;2. College of Transport & Storage and Civil Engineering in China University of Petroleum, Dongying 257061，Shandong Province，China )
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| Abstract: |
| The casing loads in creep stratum under non-uniform in-situ stresses were studied，which is one of the main factors to damage casing. It is very hard to calculate the finally steady casing loads under non-uniform in-situ stresses in creep stratum. The casing was taken as the elastic foundation and the stratum as infinite viscoelastic foundation, and then a Kelvin model was built to analyze the casing loads under non-uniform in-situ stresses in creep stratum. By stress analytical method and Laplace transform method，the distribution rules of casing loads under non-uniform in-situ stresses in creep stratum were studied. Based on the viscoelastic theory, the formulas to calculate casing stresses were obtained. The results show that if the stiffness is big enough, the casing loads will go to a stable and maximal loads distribution, and the value will approach the elastic solution with sufficient time duration. |
| Key words: creep stratum casing load non-uniform in-situstress mechanical model |
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