Drilling is one of the most challenging and expensive processes in hydrocarbon extraction
and geothermal well development. Dysfunctions faced during drilling can increase the non …

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 …

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 …

A three-dimensional finite element dynamics model of drill-string is established considering
dynamic friction model and buckling effect. The modified dynamics model is proved to have …

The applicability of a robust linear parameter varying (LPV) control for frequency fluctuation
damping in an islanded hybrid microgrid (IHMG) system (DEG/WTG/PV/FC/ESSs) is …

In this paper, the surface morphology method is improved and the bit-rock interaction model
between the rock and the PDC bit is studied, considering the influence of blades' shape and …

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 …

Weight-on-Bit is of vital importance to the drilling trajectory orientation in directional drilling.
This paper concerns robust control of drilling trajectory with weight-on-bit uncertainty for the …

In this article, a coupled axial-torsional drill-string vibration model is established, which
considers the influence of bit balling on rock-breaking and drill-string vibration. First, a bit …

The role of time delay in the control processes aimed at mitigating stick-slip vibration in drill-
strings, is of paramount importance. Its influence on the controlled system's settling time …