Abstract
A key problem in drill string dynamics is the stick–slip in deep and large displacement horizontal wells that may lead to the decline in drilling performance or cause tool failure, which may eventually cause underground accidents. Therefore, the research on the production safety, ROP, and increased efficiency in relation to stick–slip theory and practical stick–slip reduction is highly relevant, especially in complex drilling conditions. On this basis, this study takes the new constant torque tool as the engineering background and establishes the working mechanism analytical model of stick–slip reduction and torque constant. A helical dynamic model is established to solve the core problem of the constant torque tool. Then, the differential equation of the helical spline drive motion is deduced. The motion of the helical spline mandrel is calculated, and its analytical results are compared with simulation results. Findings show that the laws of angular displacement, angular velocity, axial displacement, and axial velocity are consistent with the simulation results when the helical spline mandrel moves up or down. The established theoretical model can promote the development of drill string dynamics in new drilling conditions. Moreover, the proposed designing methods can provide new ideas for the development of a stick–slip reduction tool. The results can be further used as reference for key parameter determination and stick–slip reduction technology optimization.
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Recommended by Associate Editor Gyuhae Park
Jialin Tian is currently a Professor of the School of Mechanical Engineering in Southwest Petroleum University. His research interests include mechanical dynamics, drill bit technology, downhole tools, and drilling dynamics.
Tangjia Zhang is currently a graduate student of the School of Mechanical Engineering in Southwest Petroleum University. His research interests include downhole tools and drilling dynamics.
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Tian, J., Zhang, T., Dai, L. et al. Dynamic characteristics and test analysis of a new drilling downhole tool with anti-stick-slip features. J Mech Sci Technol 32, 4941–4949 (2018). https://doi.org/10.1007/s12206-018-0942-x
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DOI: https://doi.org/10.1007/s12206-018-0942-x