Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1984-12-28
1987-10-27
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 32, 367 73, 367 75, 364422, 181104, G01V 140
Patent
active
047034602
ABSTRACT:
The shear velocity of a formation traversed by a fluid-filled open or cased borehole is obtained directly. Waveforms are obtained from a dipole acoustic investigation of the formation relative to a common location in the borehole. In this investigation, the bandwidth of the waveforms is substantially bounded by an upper frequency f.sub.u at and below which energy traveling at the shear velocity is dominant. Moreover, the bandwidth of the waveforms is concentrated near the frequency f.sub.u. The shear velocity of said earth formation is determined from these waveforms. In one embodiment, the waveforms are obtained from a broadband dipole acoustic investigation. The waveforms are low-pass filtered, and an interim shear velocity v.sub.s is determined from the filtered waveforms. The filtering and determining of v.sub.s are done first for an initial f.sub.cut, and subsequently for additional decreasing values of f.sub.cut, until a preselected relationship between f.sub.cut and v.sub.s is satisfied. The last-determined v.sub.s is the shear velocity. Other embodiments are discussed.
REFERENCES:
patent: 4606014 (1986-08-01), Winbow et al.
Chang Shu-Kong
Everhart Ann H.
Kurkjian Andrew L.
Borst Stephen L.
Carroll David H.
Coker David G.
Moskowitz Nelson
Schlumberger Technology Corporation
LandOfFree
Method and apparatus for acoustic dipole direct shear wave well does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for acoustic dipole direct shear wave well , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for acoustic dipole direct shear wave well will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1276371