... Abstract This paper investigates the drill pipe twist-offs that occurred while drilling an S-shaped well in the 12 ¼" section. The presence of the 2nd mode shape of torsional vibration was observed and linked to the failure. Conditions that lead to a 2nd mode shape being triggered and sustained...

... integrity expansion inner pipe subscript pipe modal shape insulation material Thermal Buckling of Inner Pipe at Super-High Temperature and in Continuous Multiple-Sinusoidal- Wave Mode Shape when Constrained within the Annulus of a Pipe-In-Pipe System Yunxiao Nick Wang, Steve Langford, Colin...

... waves are affected by the casing parameters. These interface waves seem to respond to the combined effect of the steel and cement comprising the casing. Complex Phase Velocity and Mode Shape of Borehole Acoustic Waves 0. Y. Liu, Schlumberger Well Services L1.4 The phenomenon of Stoneley and reflected...

... Abstract This paper focuses on the experimental study of mode shape identification, using the residues of measured data. The residues can be obtained by analyzing multiple signals from the vibration testing. And mode shapes have a relationship with the residues through a coefficient matrix...

... ABSTRACT The amplification of elastic response in large floating structures comes from selective resonance in the frequency domain. Another type of amplification is also reduced by the coincidence of wet mode shapes mad hydrodynamic pressure distribution form over file lower surface...