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Mechanics of Drillstrings and Marine Risers

D. W. Dareing
D. W. Dareing
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ASME Press
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Effective tension is one of the subtle aspects of riser performance. This term contains direct pull within riser pipes and fluid densities inside and outside. Effective tension affects everything: bending, buckling, natural frequencies, and vibration response. Other factors that directly affect riser behavior are: 1) actual tension resulting from direct top pull and gravity; 2) side loading caused by current, waves, and rig offset and motion; and 3) drilling mud density. These factors should be considered early in configuring riser design. Quasistatic analysis is fine for this. A dynamic analysis can follow. Modifications to surface tension may be required since it affects natural frequencies. Vortexinduced vibrations (VIV) should also be checked during the design phases and monitored during operations. As in any design, initial designs are modified to account for unexpected vibrations.

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