Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1985-11-13
1988-06-28
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
181102, G01V 140
Patent
active
047544392
ABSTRACT:
The present invention provides a method of logging a subterranean formation through a wellbore containing a fluid, wherein no shear wave signal is obtainable utilizing conventional sonic well logging tools suspended in the wellbore. The shear wave signal is not obtainable usually because the acoustic velocity of the wellbore fluid is greater than the shear wave velocity of the formation to be logged. In the present method, the acoustic velocity of the wellbore fluid is adjusted until a shear velocity signal is obtainable by lowering the acoustic velocity of the wellbore fluid until it is less than the shear wave velocity of the formation. Thereafter, the formation is logged through the wellbore to obtain a shear wave signal.
REFERENCES:
patent: 3126976 (1964-03-01), Cordell et al.
patent: 4108779 (1978-08-01), Carney
patent: 4549630 (1985-10-01), Brown
patent: 4575830 (1986-03-01), Ingram et al.
patent: 4611685 (1986-09-01), Curran
Hanson Kenneth E.
Rai Chandra S.
Sondergeld Carl H.
Thomsen Leon A.
Amoco Corporation
Brown S. H.
Hook F. E.
Lobo Ian J.
Tarcza Thomas H.
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