Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1982-07-01
1988-07-12
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 29, 181105, G01V 140
Patent
active
047574798
ABSTRACT:
In accordance with principles of the present invention methods and apparatus are provided for evaluating the quality of the cement bond in cased boreholes. Acoustic energy is used to excite the borehole-casing-annulus-formation system and the quality of the cement bond is determined by examining the ratios of the signals received by two longitudinally spaced apart receivers supported on a sonde. The acoustic energy is generated by two transmitters symmetrically disposed above and below the receivers along the sonde. The spacings between the receivers themselves and between the receivers and the transmitters are selected so as to enhance the correlation between the ratios of the received signals and the quality of the cement bond log. An additional receiver, supported on the sonde at a small distance from one of the transmitters, is employed to determine the quality of the cement bond in hard formations.
REFERENCES:
patent: 3149304 (1964-09-01), Summers
patent: 3291247 (1966-12-01), Majani et al.
patent: 3291248 (1966-12-01), Majani et al.
patent: 3401772 (1968-09-01), Synnott III
patent: 3401773 (1968-09-01), Synnott III
patent: 3524162 (1970-08-01), Zill
patent: 3696884 (1972-10-01), Lafleur
patent: 3909775 (1975-09-01), Larigue
patent: 4171031 (1979-10-01), Marquis
patent: 4495606 (1985-01-01), Smith
Grosmangin et al., "A Sonic Method for Analyzing the Quality of Cementation . . . ," 2/61, Journal of Petroleum Tech., pp. 165-171.
Pardue et al., "Cement Bond Log--A Study of Cement and Casing Variables", 5/63, Journal of Petroleum Tech., pp. 545-555.
Patent Memorandum, R. A. Lester, "Compensated CBL", 12/6/73.
McGee et al., "Guidelines for Improved Monitoring of Cement Operations", 21st Annual. SPWLA Logging Symp., 7/8-11/80.
Gollwitzer Lee H.
Lester Robert A.
Masson Jean-Pierre H.R.M.
Garrana Henry N.
Lobo Ian J.
Moskowitz Nelson
Schlumberger Technology Corporation
LandOfFree
Method and apparatus for cement bond logging 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 cement bond logging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for cement bond logging will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-668686