Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1988-05-12
1990-01-09
Tarcza, Thmas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 29, 181105, G01V 140
Patent
active
048932850
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: 4171031 (1979-10-01), Marquis
patent: 4495606 (1985-01-01), Smith
patent: 4757479 (1988-07-01), Masson et al.
McGhee et al., "Guidelines for Improved Monitoring of Cement Operations", 21st Ann. SPWLA Logging Symposium 1980.
Grosmangin et al., "A Sonic Method for Analyzing the Quality of Cementation, "Journal of Petrol. Tech., 2/61, pp. 165-171.
Pardue et al., "Cement Bond Log-A Study of Cement and Casing Variables", Journal of Petrol. Tech., pp. 545-555, 1963.
Gollwitzer Lee H.
Lester Robert A.
Masson Jean P. H. R. M.
Bouchard John H.
Garrana Henry N.
Lobo Ian J.
Schlumberger Technology Corporation
Tarcza Thmas H.
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