It is generally accepted that drilling with drag bits (Polycrystalline Diamond Compact bits)
simultaneously consists of “pure cutting” and “frictional contact” processes. To date, the …

The phenomenon of stick-slip vibration is widespread in the exploration of deep and ultra-
deep wells. It causes the reduction of the mechanical drilling rate and wastes the driving …

Drilling operations in the oil and gas industry present a highly complex dynamic. In this
paper, the coupled lateral–torsional vibrations of a drill string are investigated in order to …

A common issue faced in the oil and gas industry is the vibration of drill-strings, which are
detrimental to operational efficiency and can incur in great financial losses. Because of this …

Nowadays, drill string technologies are among the leading fields in the industries of oil and
gas extraction and are widely used in the construction of subway tunnels. Due to their …

Torsional stick–slip vibrations easily occur when the drill bit encounters a hard or a hard-soft
staggered formation during drilling process. Moreover, serious stick–slip vibrations of the …

Stick-slip of the drill string, as one of the critical factors affecting drilling efficiency, has
always been a hot topic for experts and scholars in related fields. Serious stick-slip vibration …

This paper investigates the addition of shape memory alloy (SMA) couplers as pipe joints in
a drill-string, exploiting the hysteretic behavior related to the superelastic effect. The main …

This work aims at studying the nonlinear dynamics of drill strings using the lumped-
parameter method (LPM). The study is based on the good consistency of the results of the …

The vibration of drill strings is a well-known source of undesirable disturbance in drilling
operation, therefore it is important to design and evaluate active controllers to suppress it …