Application of gap element to nonlinear mechanics analysis of drillstring |
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| Authors: | Liu Ju-bao Ding Hao-jiang Zhang Xue-hong |
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| Institution: | (1) Department of Civil Engineering, Zhejiang University, 310027 Hangzhou, China;(2) Department of Petroleum Mechanical Engineering, Daqing Petroleum Institute, 151400 Ando, 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 (MOGE) 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.
Project (95-108-04-02) supported by The Ninth-Five-Years Important Science and Technology Plan of China |
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| Keywords: | Drillstring Contact non-line Finite element Horizontal well |
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