Determination of the Impact of Drill String Material on Drilling Vibration Through Simulation

Abstract This paper aims to determine the impact of various drill string materials on drilling vibrations using drilling optimization software. It focuses on mitigating vibration effects to optimize drilling efficiency and equipment durability. The study explores the extent to which the various materials under consideration mitigate drilling-induced vibrations and their functionality in terms of application. The research used five different drill string materials: nylon, steel, aluminum, titanium, and composite (Fe-TiB2) to test their response to drilling-induced vibrations. The drill string, BHA, cased, and open hole section of a laboratory-scale rig were measured and inputted in the software along with the mechanical properties that can influence their response to drilling-induced vibrations. Excitation mechanisms such as wellbore contact, fluid viscosity, torque on bit (TOB), weight on bit (WOB), and revolution per minute (RPM) are used to generate and analyze vibrations to assess each material's performance in reducing vibrations. Numerical and graphical results show the degree of vibration by the different drill string materials when subjected to the same induced vibrations. Regardless of the parameters, the results revealed consistent significant differences in vibration characteristics among the tested materials. Nylon exhibited high vibration levels due to its low stiffness and lack of damping properties, while aluminum and titanium showed better vibration attenuation. However, it lacks the toughness to withstand the stress and abrasion of the drilling activity. Aluminum pipes have low wear resistance and may fail under cyclic load during pipe rotation at curved sections compared to steel pipes. The composite drill string demonstrated superior vibration reduction and is also stable and durable compared to steel and aluminum. Steel alloys remain the predominant choice for drill string components, offering a balance of strength, toughness, and cost-effectiveness. However, emerging materials such as composite offer opportunities for improving drilling efficiency and reliability. These findings provide insights into selecting optimal drill string materials to mitigate drilling vibrations and enhance overall drilling performance.