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VOL. 11, ISSUE 1 (2025)
Stress wave dynamics in drill strings: Influence of axial forces from drilling jars
Authors
Hasan N Al-Mamoori, Haifeng Ma, Jialin Tian
Abstract
This research presents a comprehensive
mathematical model for wave propagation within a drill string subjected to
external axial forces applied by a drill jar. The study examines how pulse
characteristics, including displacement, velocity, and energy distribution,
evolve and vary at various points along the drill string. A key focus is
comparing the impact point with another critical location further along the
drill string, especially in areas prone to sticking. The analysis examines the
dynamic transfer of energy within the drill string under natural damping
conditions using MATLAB-based simulations. These simulations are particularly
valuable for highlighting how energy is transferred, dissipated, and absorbed
at sticking points, providing insights into the resulting stress and strain
patterns. The study highlights the impact of natural damping on wave behavior,
illustrating how it attenuates specific high-frequency components while
promoting energy retention over extended durations. This clarifies how drill
strings can be optimized to reduce stress concentrations and avoid potential
failure points. Additionally, the results illuminate the behavior of stress
waves as they interact with different sections of the drill string, indicating
zones where structural weaknesses are likely to emerge. These findings contribute
to a broader understanding of wave dynamics in drilling operations and inform
strategies for improving drilling performance, minimizing mechanical wear, and
enhancing overall operational safety. By advancing predictive capabilities for
wave behavior in drill strings, this research supports the design of more
resilient drilling systems that are better equipped to handle challenging
downhole environments and deep drilling conditions.
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Pages:30-37
How to cite this article:
Hasan N Al-Mamoori, Haifeng Ma, Jialin Tian "Stress wave dynamics in drill strings: Influence of axial forces from drilling jars". International Journal of Research in Advanced Engineering and Technology, Vol 11, Issue 1, 2025, Pages 30-37
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