Method and apparatus for cement bond logging

Details Method and apparatus for cement bond logging Method and apparatus for cement bond logging

G - Physics

01

V

349/6

G01V 1/40 (2006.01) E21B 47/00 (2006.01) G01V 1/28 (2006.01) G01V 1/44 (2006.01)

Patent

CA 1203881

ABSTRACT OF THE DISCLOSURE In accordance with principles of the present inven- tion 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 deter- mined 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 sym- metrically 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 addi- tional 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.

431678

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