Talk by Dr. Madhu Vadali from University of Wisconsin-Madison, USA

About the speaker:
Dr. Madhu Vadali received B.E. in Electrical Engineering from Osmania University in 2008 and M.S. and PhD in Mechanical Engineering from University of Wisconsin at Madison, USA in 2010 and 2013 respectively. His current research focuses on Control and Automation.
Abstract of the Talk: "Control of Rotary Steerable Systems "
One of its critical attributes of directional drilling is to produce many wellbore shapes, including low angle, high angle, horizontal wells, and extended reach wells. During directional drilling, the bit is guided to reach a predetermined underground target. The most common mechanical system used in directional drilling is a rotary steerable systems (RSS). The RSS, however, continuously adjusts the bit orientation (toolface - TF) without stopping the drill string rotation by actuating a complex hydro-electro-mechanical system located at the bottom hole assembly (BHA). In this section of the talk, I will present model of a geo-stationary point-the- bit RSS. Because the RSS dynamics are in a strict feedback form, a back stepping algorithm is proposed for the TF control. Simulation results of the proposed method demonstrate fast command tracking, robustness to external disturbances at the bit, and modeling inaccuracies.