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Keywords: phase velocity
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Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0003
... to downhole environment have been so far very limited. We present in this work an innovative deep learning framework to estimate spinner phase velocities from Doppler based sensor velocities. Tests of the framework on a benchmark data set displayed strong estimation results, in particular outlining...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-ZZZZ
... ultrasonic transducers while the rock undergoes confining and deviatoric stress. Phase velocities are obtained using conventional ultrasonic end-caps in the triaxial frame while group velocities are obtained by adding small-size transducers around the core sample. The small-size transducers work both...
Proceedings Papers

Paper presented at the SPWLA 45th Annual Logging Symposium, June 6–9, 2004
Paper Number: SPWLA-2004-X
... Upstream Oil & Gas frequency borehole frequency transmitter log analysis Dispersion Correction receiver geophysics transmitter Symposium semblance plot algorithm dual-frequency lwd sonic tool expand well logging phase velocity unipolar transmitter technology dispersion effect...
Proceedings Papers

Paper presented at the SPWLA 29th Annual Logging Symposium, June 5–8, 1988
Paper Number: SPWLA-1988-YY
... the same vertical P- and S-wave velocities. The symmetry axis for the transverse isotropy was parallel to the borehole. The differences between the phase velocities for the transversely isotropic and isotropic formations depend on the type of wave, its frequency, and the amount of anisotropy, and can...
Proceedings Papers

Paper presented at the SPWLA 25th Annual Logging Symposium, June 10–13, 1984
Paper Number: SPWLA-1984-ZZ
... Upstream Oil & Gas log analysis phase velocity stoneley phase velocity frequency shear velocity slow formation well logging shear head wave Stoneley wave dependence formation shear stoneley shear formation shear modulus fluid bulk Symposium inversion process compressional...
Proceedings Papers

Paper presented at the SPWLA 24th Annual Logging Symposium, June 27–30, 1983
Paper Number: SPWLA-1983-V
.... Reservoir Characterization frequency phase velocity kHz full waveform acoustic log Upstream Oil & Gas formation shear wave velocity synthetic microseismogram Poisson well logging attenuation shear wave velocity Symposium Stoneley wave log analysis microseismogram wave packet velocity...
Proceedings Papers

Paper presented at the SPWLA 24th Annual Logging Symposium, June 27–30, 1983
Paper Number: SPWLA-1983-JJ
... are needed to establish the flow regime and flow pattern for determining the downhole fluid phase velocities from production logs. For comparison of the calculated subsurface flow rates with the measured flow rates at the surface, the formation volume factors and dissolved gas volume at downhole pressure...
Proceedings Papers

Paper presented at the SPWLA 23rd Annual Logging Symposium, July 6–9, 1982
Paper Number: SPWLA-1982-S
... to the one describing the propagation of Stoneley waves along a plane fluid-solid interface. Again equating the fluid density to zero then results in the Rayleigh wave equation for a plane free surface. Phase velocity, group velocity and attenuation coeffi- cients derived from the general expressions...
Proceedings Papers

Paper presented at the SPWLA 23rd Annual Logging Symposium, July 6–9, 1982
Paper Number: SPWLA-1982-P
... their generation, velocity dispersion, attenuation, and particle motion, in the frequency range of 0-15 kHz. The phase velocity of the tube wave is lower than the borehole fluid and formation shear velocities . In extreme cases where the formation shear velocity is less than about 0.7 times the fluid velocity...

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