Rotary table DC drive operation under conditions of unstable rotation of drill bit

The article analyzes operation of DC drive in the thyristor converter–drive system (TC–D) of drill string under conditions of self-oscillations and unstable rotation of drill bit, with jamming, arrest and subsequent stick–slip. The problem of nonsteady rotation has become the most acute with arrival of cutting/grinding type PDC bits currently common in drilling. This type bits contribute to stick–slip, on the one hand, and, and the same time, are the most susceptible to this effect, which results in premature failure of the tool. For the years passed since PDC bit came into use, various methods to overcome unstable rotation of drill bits have been developed and implemented in drilling, but the problem yet remains unsolved and is being amply investigated. This article considers the problem solvability using an automatic DC drive. A three-mass model of rotary table DC drive in TC–D system has been developed and implemented in MatLab. The model takes into account deformation, elastic vibrations and energy dissipation in drill string with slave drive control via the drill anchor channel and actuation channel. The computer-aided modeling allowed testing and proving the typical modes of control over self-oscillations and unstable rotation of drill bit with stick–slip effect. The ways of improving the rotary table DC drive control are identified.

Ershov M. S., Balitsky V. P., Melik-Shakhnazarova I. A. Rotary table DC drive operation under conditions of unstable rotation of drill bit. MIAB. Mining Inf. Anal. Bull. 2020;(11):166-179. [In Russ]. DOI: 10.25018/0236-1493-2020-11-0-166-179.

M.S. Ershov¹, Professor, e-mail: msershov@yandex.ru,
V.P. Balitsky¹, Assistant Professor,
I.A. Melik-Shakhnazarova¹, Assistant Professor,
¹ I.M. Gubkin Russian State University of Oil and Gas (National Research University), 119991, Moscow, Russia.

M.S. Ershov, e-mail: msershov@yandex.ru.

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