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Published in: Arabian Journal for Science and Engineering 7/2021

05-01-2021 | Research Article-Petroleum Engineering

Improved Multi-section Variable-Speed Drilling Tool Design for Oil and Gas Industry

Authors: Jialin Tian, Haili Yang, Liming Dai, Lin Yang, Heng Li

Published in: Arabian Journal for Science and Engineering | Issue 7/2021

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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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Literature
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go back to reference Wang, F.J.: Computational Fluid Dynamics Analysis. Tsinghua University Press, Beijing (2004) Wang, F.J.: Computational Fluid Dynamics Analysis. Tsinghua University Press, Beijing (2004)
Metadata
Title
Improved Multi-section Variable-Speed Drilling Tool Design for Oil and Gas Industry
Authors
Jialin Tian
Haili Yang
Liming Dai
Lin Yang
Heng Li
Publication date
05-01-2021
Publisher
Springer Berlin Heidelberg
Published in
Arabian Journal for Science and Engineering / Issue 7/2021
Print ISSN: 2193-567X
Electronic ISSN: 2191-4281
DOI
https://doi.org/10.1007/s13369-020-05234-7

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