engleski

Single-Step Drill-string Drive Active Damping Speed Controller Auto-Tuning Based on Closed-Loop Step Response Properties

This paper presents a control system design methodology suitable for the drill-string rotary drive for deep drilling applications. The active damping control system automatic tuning is performed by designing the drill-string parameter estimator which simultaneously calculates the drive resonance frequency and inertia using a single limited-duration closed loop experiment characterized by drive limit cycle oscillations. The design of proposed parameter estimator has been based on a suitable control-oriented process model of the torsional oscillator and utilization of a modified-mixer phase detector phase locked-loop (MMPD-PLL) equipped with adaptive second-order generalized integrator (SOGI) for the extraction of key features of the drive resonance mode. The rotary speed active damping system tuning is based on the so-called damping optimum criterion which guarantees a desired level of closed-loop system damping. The functionality of the proposed control system has been thoroughly verified by means of simulations, with the drill-string parameter estimator also being confirmed using the previously recorded field data to illustrate its robustness in the presence of realistic measurement noise.

Rotary drilling electrical drive ; torsional vibrations ; active damping ; speed control ; automatic tuning ; phase-locked loop ; simulations ; field test data

nije evidentirano