Date: May 15, 2025

Time: 1:30pm EST

Location (Hybrid): MRDC 4211

Meeting Link: https://gatech.zoom.us/j/96260223994?pwd=6LBigzMraBKoLn16Ss8Vy50FY2sCZ8.1

Meeting ID: 962 6022 3994

Passcode: 165211

Title: Minimizing drillstring vibrations via high-fidelity modeling and control strategies

Abstract:

Accurate modeling and analysis of drillstring systems plays an important role in developing deep wells for geothermal resource extraction. Self-excited vibrations are inevitable in the drilling process. A drillstring is a very flexible structure subjected to dynamic loading and boundary conditions such as nonlinear interactions between bit and rock or drillstring and wellbore wall. Torsional vibrations, specifically stick-slip, cause damage and failure of drilling equipment. Stick-slip also exacerbates axial and lateral vibrations. Thus, it remains a pertinent task to develop tools that can reduce and avoid damaging vibrations. This work aims to develop high fidelity models capable of producing undesired dynamic behavior and implementing robust control strategies to suppress unwanted behavior.

Committee: 

Anirban Mazumdar (Advisor) - School of Mechanical Engineering 

Jiann-Cherng Su - Sandia National Laboratories

Ellen Yi Chen Mazumdar - School of Mechanical Engineering

Haiying Huang - School of Civil and Environmental Engineering

Michael Leamy - School of Mechanical Engineering