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 …

A stable rotational speed of the marine propeller shaft is essential to minimize the friction of
the supporting bearings and to improve the efficiency of the power system. While, the friction …

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 …

A survey of the literature related to theoretical and experimental studies on stick–slip
vibration in oilwell drillstring is carried out in this study. It aims to explain key concepts and …

A stable operating state of the marine shaft-bearing system is essential to minimize the
vibration level and improve the transmission efficiency of the ship power system. A semi …

This paper presents development of a novel control scheme for suppressing stick–slip
oscillations of drill-strings. This scheme utilises a Modified Integral Resonant Control (MIRC) …

This paper presents active vibration control to reduce the stick-slip oscillations in drill-strings.
A simplified two degrees-of-freedom drill-string torsional model is considered. The nonlinear …

The undesired stick-slip vibrations of the drill-string can lead to drilling failures or even
serious drilling accidents. Most of previous researches devoted to controller design to …

Failures during oil extraction can have impacts on exploration costs and time, especially
those caused by vibrations during the drilling phase. A proper way to reduce these …

The undesired stick-slip vibration is the main source of PDC bit failure, such as tooth fracture
and tooth loss. So, the study of PDC bit failure base on stick-slip vibration analysis is crucial …