Casing resonant radial flexural modes in cement bond evaluation

Details Casing resonant radial flexural modes in cement bond evaluation Casing resonant radial flexural modes in cement bond evaluation

G - Physics

01

N

G01N 29/12 (2006.01) E21B 17/00 (2006.01) G01N 3/32 (2006.01) G01N 19/04 (2006.01) G01V 1/44 (2006.01) E21B 47/09 (2006.01)

Patent

CA 2570628

- 18- ABSTRACT A method useful for evaluating the presence and/or the quality of the cement bond of a downhole tubular. The method involves measuring radial resonance modes of the tubular, and comparing those measured values to the unbound tubular resonant values of a calibration ring. For a well bonded tubular, the measured radial resonance should be greater than that of the unbound tubular calibration ring. In regions where a fluid, such as water surrounds the outside of the tubular, or the cement is otherwise not bonded to the outer surface of the tubular, the measured response should be less than the calibrated response. The calibration ring should have the same diameter, wall thickness, and be made of the same material as the tubular.

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