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Mechanical Sciences An open-access journal for theoretical and applied mechanics
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Volume 7, issue 2
Mech. Sci., 7, 189-200, 2016
https://doi.org/10.5194/ms-7-189-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Mech. Sci., 7, 189-200, 2016
https://doi.org/10.5194/ms-7-189-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 31 Aug 2016

Research article | 31 Aug 2016

Model of a new joint thread for a drilling tool and its stress analysis used in a slim borehole

Yu Wang1,2, Bairu Xia1,2, Zhiqiao Wang1,2, and Chong Chai1,2 Yu Wang et al.
  • 1School of Engineering and Technology, China University of Geosciences, 100083 Beijing, China
  • 2Key Laboratory on Deep Geo-Drilling Technology of the Ministry of Land and Resources, China University of Geosciences, 100083 Beijing, China

Abstract. The drilling pipe used in slim-borehole drilling performs well due to its low cost and high efficiency. Good sealing properties and coupling strength are the two keys to ensure that the pipe works correctly. In this paper, a 68mm diameter drilling pipe and its joint are developed. On the basis of Lame's theory, the contact model of the joint thread is represented under different axial force, makeup torque, and pressure difference between inner and outer pipe. This model provides a good reference for judging the quality of sealing of the joint thread. The analysis software ANSYS\Workbench is applied to stimulate the distribution of contact stress and sealing properties. A premium condition for drilling has been proposed, which provides a good theoretical basis for slim-borehole drilling.

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