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《Natural Gas Industry》 2001-01
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ANALYSIS OF SOME PROBLEMS IN CASING CALCULATION BY FINITE ELEMENT METHOD

Zhang Xiaoyu(Ching Petroleum Planning Institute).  
In this paper,Some easy to be ignored problems in casing calculation by finite element method,such as the influence of the factors of load carrying step length,unit division and heterogeneity,etc.,on the calculation results,are systematically discussed.The analysis results show that ①The load carrying step length has an important influence on the calculation results,especially,after having entered into the plastic stage,the insufficiently precise step length will lead to wrong results;②Because the casing form is relatively simple,the influence of the unit division on the calculation results is easy to be ignored.In fact,even for the stress calculation of the most simple plane problem,the unit quantity should not be too few,especially,for the casing deformation calculation,only one unit divided along the wall thickness direction is not enough and ③The influence of hterogeneous load on casing damage is very great,which are reflected in two aspects as follows:①When the heterogeneity of load increases,the maxium load the casing bear will rapidly decrease and ②Under the action of heterogeneous load and after a certain local yield appears on the casing,even the load does not increase any more,the casing deformation capacity will still continuously increase.These analyses and conclusions not only clarify some problems existed over a long period of time in the casing calculation by finite element method,but also make us have a new knowledge of the mechanism of casing deformation.
【Fund】: 中国石油天然气集团公司石油科技中青年创新基金资助项目
【CateGory Index】: TE931
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