... and relatively shorter recording time length to the slower and more dispersive waveforms. As the results in the parameter updates, the coverages of shear waveform recording were improved for all receiver stations and enable to extract the slower shear slowness at shallower interval of the new well. Thus...

... inversion processing. Numerical modeling in anisotropic formations coupled with data examples are presented, including dispersion plots, that demonstrate these effects and explain the techniques used. Reservoir Characterization orientation Upstream Oil & Gas shear slowness asymptote...

... measurements are inputs to wellbore stability control, surface seismic correlation, shallow gas identification, and various other applications. If the formation being logged is very slow, leaky-P and quadrupole shear are needed to determine the formation compressional and shear slowness. Now that both...

... appropriate wellbore stability management. Deriving shear slowness in quadrupole acoustic logging requires an inversion method that takes into account the dispersion of the quadrupole mode and includes the effects of tool presence. The inversion can be run in both real-time and during memory processing...

... Abstract Most production and observation wells are cased. Hydraulic fracturing of unconventional coalbed methane and shale gas reservoirs and acidization of carbonate reservoirs are essential production steps to enhance hydrocarbon productivity. Cased-hole radial profiling of shear slownesses...

... Abstract A multipole sonic-while-drilling service combines high-quality monopole and quadrupole measurements to deliver robust compressional and shear slowness - along with enhanced Stoneley data - in a wide range of applications, regardless of mud slowness. Compressional and shear data from...

... ABSTRACT Sonic logging is a well-established reliable method to determine the compressional and shear slownesses of a formation in open hole. However, it is not always possible to log in open hole because of difficult well conditions (old wells, shallow or unconsolidated formations), and sonic...

...The 18th Formation Evaluation Symposium of Japan, September 27 - 28, 2012 -1- ROBUST ESTIMATION OF SHEAR SLOWNESS FROM QUADRUPOLE MODE IN LWD ENVIRONMENT Zhenxin Zhang, Manabu Mochida, Miyako Kubota, Hiroaki Yamamoto, David Scheibner, Takeshi Endo 1 1. Schlumberger K.K. This paper was selected...