Analysis of the Toolface Stability of a Motor-Fully-Rotating Directional Drilling System

Deng, Tiansheng; Li, Qian; Yin, Hao

doi:10.1007/s13369-022-07073-0

Cited by 2 publications

(1 citation statement)

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“…Following nearly two decades of research, it is imperative for the domestic development of rotary steerable tools to enter an accelerated phase. During the drilling process, the rotary steerable system could ensure that the wellbore trajectory is drilled at the set angle, and the key technology to achieve this goal is to achieve the stable control of the stabilized platform at any given angle [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Self-Stabilizing Control Strategy of Stabilized Platform for Rotary Steerable Drilling System Based on Adaptive Backstepping Control

Li,

Wang,

et al. 2024

Actuators

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To enhance the robustness of the toolface angle control in a fully rotary steerable drilling tool, a backstepping control law and a drilling fluid flow adaptive law are devised based on the dynamic model of the stable platform. The Lyapunov function is constructed, and it is proven that the adaptive backstepping control system of the stabilized platform is stable. Furthermore, in order to address problems such as the friction dead zone and excessive rotational kinetic energy in the stabilized platform system, which could cause toolface angle oscillations and the rapid rotation of the stabilized platform, we additionally propose an online estimation method for the balancing torque and velocity-angle control switching strategy. By combining the backstepping control law, drilling fluid flow adaptive law, and velocity-angle control switching strategy, a self-stabilizing control strategy for the stabilized platform is established. In comparison with the PID control method, the simulation results show the superiority of the proposed scheme under complex disturbances from a downhole environment. And the drilling simulation experiment results indicate that the proposed control method has a good anti-interference capability under various conditions, including drilling fluid flow rate, inclination angle, and drill collar rotational speed. Therefore, the proposed control method can improve the robustness of the stabilized platform control system.

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Section: Introductionmentioning

confidence: 99%