Suppressing torsional vibration of drill-string has great safety and economic importance to
drilling process. Note that most existing control methods only measure surface information …

在油气井钻进作业过程中, 钻柱长期工作在充满钻井液的狭长井筒里, 其受到井底压力, 摩擦,
岩石硬度变化的影响, 受力情况非常复杂, 会产生多种形式的振动, 这些是影响钻具寿命和钻进 …

With the increase of drilling depth, complicated geological environments lead to a high risk
of loss and kick. Fault diagnosis plays an essential role in minimizing the financial and …

Lost circulation events during drilling operations are known for their abruptness and are
difficult to control. Traditional diagnostic methods rely on qualitative indicators, such as mud …

In this paper, a robust mixed-sensitivity H∞ controller is designed to control surface weight
on bit using surface measurement feedback. First, we construct a drill-string longitudinal …

Despite a significant research effort to understand and mitigate stick-slip in drill-strings, this
problem yet to be solved. In this work, a comprehensive parametric robustness analysis of …

In this article, a systematic linear parameter-varying (LPV) model and a gain-scheduled
control methodology for drill-string systems are proposed to analyze drill-string dynamics …

This paper is concerned with observer‐based trajectory control of directional drilling system
with rotary steering devices. Since the trajectory orientation cannot be measured directly …

Stick–slip vibrations are widespread and hazardous phenomena in drilling practice. The
objective of this paper is to develop a simple and general control strategy to minimise such …

This article is concerned with suppression of coupled axial–torsional vibration of drill-string
system, taking into account the state-dependent delay inherited from regenerative cutting of …