Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1981-11-19
1985-11-05
Cangialosi, Salvatore
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
181105, 367 28, G01V 140
Patent
active
045518238
ABSTRACT:
A logging instrument is caused to traverse a cased earth borehole periodically emitting and receiving acoustic energies, such instrument generating an electrical signal containing one or more electrical alternations representative of the received acoustic energies, and such alternations having an amplitude generally functionally related to the attentuation of the acoustic energies as they traverse the casing within the borehole. A significant portion of these alternations is determined and digitized, and the individual digitized values therein summed together to yield a functional representation of the signal area of the alternations of a predetermined polarity within the significant portion. This signal area is then compared to the area which would be indicated if the casing were free of cement bonding, the comparison yielding an indication of the relative degree of bonding of cement to the casing within the borehole.
REFERENCES:
patent: 3291248 (1966-12-01), Majani et al.
patent: 3292146 (1966-12-01), Dewan
patent: 3401772 (1968-09-01), Kokesh
patent: 3401773 (1968-09-01), Synnott
patent: 3714590 (1973-01-01), Freeman et al.
patent: 4255798 (1981-03-01), Havira
patent: 4382290 (1983-03-01), Havira
M. Grosmangin et al., "A Sonic Method for Analyzing the Quality of Cementation of Borehole Casings", Journal of Petroleum Technology, Feb. 1961, pp. 165-171.
Pardue et al., "Cement Bond Log-A Study of Cement and Casing Variables", Journal of Petroleum Technology, May (1963), pp. 545-555.
Advertisement by Gearhart Industries, Inc., located in Mar. 1981, edition of Petroleum Engineer International.
Carmichael Jerry H.
Wellington Charles H.
Byron Richard M.
Cangialosi Salvatore
Dresser Industries Inc.
Kaiser K. R.
McCollum Patrick H.
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