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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (4): 440-444    DOI: 10.1631/jzus.2002.0440
Industrial Control Technology     
Application of gap element to nonlinear mechanics analysis of drillstring
LIU Ju-bao, DING Hao-jiang, ZHANG Xue-hong
Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China; Department of Petroleum Mechanical Engineering, Daqing Petroleum Institute, Anda 51400, China
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Abstract  This paper presents a nonlinear finite element method to resolve the problem of the nonlinear contact between the drillstring and hole wall by using a Multi-directional Contact Gap Element (MCGE) contacting at appropriate positions in each beam element. The method was successfully applied to the Daqing Oil Field GP1 well. It was shown that the drillstring\'s contact resistance at any well depth could be obtained by calculations and that as the error in the calculation of the hole top load is below 10%, the calculation result can provide theoretical basis for the design and operation of drillstrings.

Key words： Drillstring      Contact non-line      Finite element      Horizontal well     
Received: 06 May 2001     
CLC:  TB115  
  TE242.3  
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DING Hao-jiang
LIU Ju-bao
ZHANG Xue-hong
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LIU Ju-bao, DING Hao-jiang, ZHANG Xue-hong. Application of gap element to nonlinear mechanics analysis of drillstring. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(4): 440-444.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0440     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I4/440

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