Abstract
A new multi-section variable-speed drilling tool design that improves rock drillability in deep and ultra-deep wells is presented in this paper. Two kinds of multi-section variable-speed drilling tools are analyzed computationally and experimentally to solve nozzle clogging and bit balling problems. Analytical results show that not only that the minimum flow velocity at the pilot and the reaming bit nozzle are increased by 17% and 138%, respectively, but also that bit balling was effectively prevented by means of this new design, which greatly improves reverse circulation of the drilling fluid. Besides, under the different speed combinations of the pilot and the reaming bit, increasing the relative speed of the pilot bit is beneficial to the discharge of drilling fluid and improving the rock-breaking efficiency. The good agreement between the calculations and experimental measurements demonstrates the excellent prospects of this drilling tool in deep well drilling.
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Acknowledgements
This work is supported by National Natural Science Foundation of China (No.11102173), Major National Science and Technology Project (No.2016ZX05038) and the State Foundation for Studying Abroad (No.201608515039), High-end foreign experts introduction plan(SYZ201985).
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Tian, J., Yang, H., Dai, L. et al. Improved Multi-section Variable-Speed Drilling Tool Design for Oil and Gas Industry. Arab J Sci Eng 46, 6903–6913 (2021). https://doi.org/10.1007/s13369-020-05234-7
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DOI: https://doi.org/10.1007/s13369-020-05234-7