Summary During drilling operations, drillstring vibrations cause many downhole dysfunctions, resulting in underperformance, equipment failure, and possibly wellbore damage. Current vibration mitigation solutions are generally located at a single site, either the topdrive or close to bit. However, because sources of excitation distributed along whole drillstring, these single-point damping do no...

In electrified liquefied natural gas (LNG) plants variable frequency drives (VFDs) interact with turbine-generator (TG) units creating torsional vibrations known as sub-synchronous interactions (SSTIs). Torsional can be dangerous for an LNG plant when they involve instability. The stability of depends on the configuration and number TG VFDs. such peculiar configurations cannot achieved acting V...

Downhole drilling motors or mud motors are frequently used during the oil and gas well construction, especially for construction of directional and horizontal segments. However, low operation life of the down hole drilling motors and high rate of wear in their working elements may constrain their application due to technical and economical disadvantageousness. In this work, a high-torque modula...

1Department of Mechanical Engineering, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands 2Department of Civil, Environmental & Geo-Engineering, University of Minnesota, Minneapolis, USA 3Delft Center for Systems and Control, Delft University of Technology, Delft, The Netherlands 4Well Engineering Design, Nederlandse Aardolie Maatschappij B.V. (NAM), The Netherlands 5Wells ...

This article focuses on the possibility of using an innovative drilling method for implementation underground works, especially where there is no physical large working machines. Work a model carried out under INDIRES project discussed. A design tool equipped with proposed technology presented. The solution in question makes it possible to increase efficiency process, which confirmed by compute...