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CLC number: TB115,TE242.3

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Received: 2001-05-06

Revision Accepted: 2001-11-30

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Journal of Zhejiang University SCIENCE A 2002 Vol.3 No.4 P.440-444


Application of gap element to nonlinear mechanics analysis of drillstring

Author(s):  LIU Ju-bao, DING Hao-jiang, ZHANG Xue-hong

Affiliation(s):  Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s): 

Key Words:  Drillstring, Contact non-line, Finite element, Horizontal well

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LIU Ju-bao, DING Hao-jiang, ZHANG Xue-hong. Application of gap element to nonlinear mechanics analysis of drillstring[J]. Journal of Zhejiang University Science A, 2002, 3(4): 440-444.

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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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


[1] Brett, J.F., Beckett, A.D., Holt, C.A. et al., 1989. Uses and limitations of drillstring tension and torque for monitoring hole condition. SPE Drilling Engineering, 4(3): 223-229.

[2] Liu, J.B., 1996. Finite element analysis of petroleum equipment. Petroleum Industry Press, Beijing, p.61-90 (in Chinese).

[3] Ma, S.Z., Han Zhiyong, 1996. The fractional resistance and force moment of drillstring calculated in horizontal well. Journal of the University of Petroleum, 20(6): 50-54 (in Chinese).

[4] Payne, M.L., Abbassion, F., 1997. Advanced torque and drag consideration in extended reach wells. SPE Drilling & Completion, 12(1): 55-62.

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