ERL Industry Consortia Technical Reports: Recent submissions

Now showing items 268-270 of 456

    • Application Of Rayleigh's Principle To Guided Waves In A Borehole 

      Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
      The Lagrangian for guided waves in a completely general borehole model is presented. Rayleigh's principle is used to derive the first order perturbations in wavenumber and frequency due to slight perturbations in the ...

    • Full Wave Logging In An Irregular Borehole 

      Bouchon, Michel; Schmitt, Denis (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
      We present a boundary integral equation formulation for the problem of wave propagation in a borehole of irregular cross-section. The method consists in representing the wave field diffracted at the borehole-rock interface ...

    • Estimating Phase Velocity And Attenuation Of Guided Waves In Acoustic Logging Data 

      Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
      Phase velocity and attenuation of guided waves have been estimated from acoustic logging data recorded by a receiving array. The method uses data from multiple sources and successive depths yielding more accurate estimates ...