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Chapter 3
Drillstring Mechanics

Excerpt

The overall behavior of drillstrings is complex. Dynamic behavior is the combination of the effects of axial, tortional and lateral modes of vibration. Well bore confinement offers the greatest challenge in predicting drillstring behavior. Solutions to the overall dynamic behavior of drillstrings are possible through finite element techniques. However, much can be learned through mathematical models of the various modes (axial, tortion, lateral) of motion. Coupling these analyses with measurements of downhole parameters while drilling provides much information for the design and control of drillstrings.

  • 3.1 Buckling and Lateral Vibrations of Drill Pipe
  • 3.2 Buckling of Drill Collars
  • 3.3 Stabilizer Placement Analysis
  • 3.4 Buckling on an Inclined Plane
  • 3.5 Drill Collar Dynamics
  • 3.6 Theories of Axial and Torsion Vibration
  • 3.7 Vibration Control
  • 3.8 Friction in Directional Wells

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