Fourth international colloquium on nonlinear dynamics and control of deep drilling systems, Stavanger, Norway, May 14-16th, 2018

This version of these proceedings are a rectified version of an earlier version of the proceedings. The abstract EFFECTIVENESS ANALYSIS OF ANTI STICK- SLIP TOOLS has been removed from the proceedings as it did not carry the full consent of all partners involved in the research project from which the abstract resulted. Authors agreed that some of the outcomes of the paper require further investigations and clarifications.