Abstract Systems and methods determine friction in a borehole during drilling operations. A
drilling system applies oscillatory angular movement at the top of a drill string in a wellbore …

A drilling system configured to reduce friction during slide drilling. The drilling system has a
drill string comprising a fluid-driven drill stage such as a mud motor; a variable frequency …

A system and method for controlling the frequency or amplitude of vibrations during drilling
of a well. A system for generating mechanical vibrations may generate a control signal to …