Mohammed Al Dushaishi, Ph.D., an assistant professor at Texas A&M University, gave a seminar Friday, March 1 about drilling optimization using drill stem vibration modeling.

Abstract: Drilling optimization is the process of improving drilling efficiency and reducing non-productive time caused by multiple issues such as drilling vibrations, fluid losses, wellbore placement, etc. Drilling-related problems such as drill stem vibration are one of the leading causes of premature failure of drill stem components. In severe cases, drill stem vibration will lead to wellbore instability that will result in an increase in the operating cost. High vibration level has been linked to bottom hole assembly configurations, bit design, selection of operating parameters, fluid flow, and frequent lithology changes. In this seminar, a presentation of drill stem vibration modeling and vibrations effect on drilling performance will be presented. Drilling dynamics was used to optimize drilling performance by developing a non-linear drill stem vibration model. The model is used to analyze drilling dynamics and predicts critical operating parameters to be avoided. Brief introduction of the modeling procedure and its capabilities are outlined. The model was developed in stages, including quantitative assessment with vibration data collected from wells in the North Sea. Further discussions will include a more recent model development, which addresses drill stem torsional vibrations for reaming while drilling operations.

Biography: Mohammed Al Dushaishi joined Texas A&M International University in 2017, as an Assistant Professor at the School of Engineering. His research area is related to vibration modeling of discrete and continuous systems, fatigue analysis, fluid interaction with structures and data analytics. His work generated several publications that contributed to drilling dynamics and optimizations in well-respected journals. He is a CO-PI in a project that addresses real-time optimization of drill stem vibration and rate of penetration for geothermal drilling, where the project is sponsored by DOE. Dr. Al Dushaishi holds a Ph.D. and MS degrees in Petroleum Engineering and a BS in Mechanical Engineering, all from Missouri University of Science and Technology.