Abstract Ultrasonic leaky Lamb waves are sensitive to defects and debonding in multilayer media. In this study, we use the finite-difference method to simulate the response of flexural waves in the presence of defects owing to casing corrosion and rough fluctuations at the cement-formation interface. The ultrasonic obliquely incidence could effectively stimulate the flexural waves. The defects owing to casing corrosion change the amplitude of the early-arrival flexural wave, which gradually decrease with increasing defect thickness on the exterior walls and is the lowest when the defect length and wavelength were comparable. The scattering at the defects decreases the energy of flexural waves in the casing that leaks directly to fluids. For rough cement-formation interface, the early-arrival flexural waves do not change, whereas the late-arrival flexural waves have reduced amplitude owing to the scattering at rough interface.
This study was partially supported by the Research and Development of Key Instruments and Technologies for Deep Resources Prospecting (No. ZDYZ2012-1-07) and the National Natural Science Foundation of China (Nos. 41204099, 11134011, and 11274341).
Anderson, W. L., and Walker, T., 1961, Acoustic cement bond logging: 2nd Annual Logging Symposium transactions, SPWLA, 1−6.
[2]
Chimenti, D. E., and Martin, R. W., 1991, Nondestructive evaluation of composite laminates by leaky Lamb waves: Ultrasonics, 29(1), 13−21.
[3]
Chimenti, D. E., and Nayfeh, A. H., 1985, Leaky Lamb waves in fibrous composite laminates: Journal of applied physics, 58(12), 4531−4538.
[4]
Duan, W. X., Qiao, W. X., Che, X. H., et al., 2014, Acoustic evaluation of cementing quality using obliquely incident ultrasonic signals: Applied Geophysics, 11(3), 269−276.
[5]
Chimenti, D. E., and Nayfeh, A. H., 1985, Leaky Lamb waves in fibrous composite laminates: Journal of applied physics, 58(12), 4531−4538.
Ghiselin, D., 2006, Pitch-catch scores a home run: E&P: A Hart Energy Publication, 79.
[8]
Hayden, R., Russell, C., Vereide, A., et al., 2011, Case studies in evaluation of cement with wireline logs in a deep water environment: 52nd Annual Logging Symposium transactions, SPWLA, 14−18 May, Colorado Springs, Co., USA, 1−15.
[9]
He, X., Chen, H., and Wang, X. M., 2014, Ultrasonic leaky flexural waves in multilayered media: Cement bond detection for cased wellbores: Geophysics, 79(2), A7−A11.
[10]
Duan, W. X., Qiao, W. X., Che, X. H., et al., 2014, Acoustic evaluation of cementing quality using obliquely incident ultrasonic signals: Applied Geophysics, 11(3), 269−276.
Ghiselin, D., 2006, Pitch-catch scores a home run: E&P: A Hart Energy Publication, 79.
[13]
Hayden, R., Russell, C., Vereide, A., et al., 2011, Case studies in evaluation of cement with wireline logs in a deep water environment: 52nd Annual Logging Symposium transactions, SPWLA, 14−18 May, Colorado Springs, Co., USA, 1−15.
[14]
Levander, A. R., 1988, Fourth-order finite-difference P-SV seismograms: Geophysics, 53(11), 1425-1436.
[15]
Rose, J. L., 1999, Ultrasonic waves in solid media: Cambridge University Press, England.
[16]
He, X., Chen, H., and Wang, X. M., 2014, Ultrasonic leaky flexural waves in multilayered media: Cement bond detection for cased wellbores: Geophysics, 79(2), A7−A11.
[17]
Song, R. L., Liu, J. X., Hou, C. H., et al., 2012, Numerical simulation of Sector Bond log and improved cement bond image: Geophysics, 77(4), D95−D104.
[18]
Wang, T., and Tang, X. M., 2003, Finite-difference modeling of elastic wave propagation: A nonsplitting perfectly matched layer approach: Geophysics, 68(5), 1749−1755.
[19]
Levander, A. R., 1988, Fourth-order finite-difference P-SV seismograms: Geophysics, 53(11), 1425-1436.
[20]
Wei, T., 2010, Evaluation of oil and gas well cementing quality: Petroleum Industry Press, China, 1-5.
[21]
Zeroug, S., and Froelich , B., 2003, Ultrasonic leaky- Lamb wave imaging through a highly contrasting layer: IEEE Microwave and Guided Wave Letters, 11(5), 794-798.
[22]
Rose, J. L., 1999, Ultrasonic waves in solid media: Cambridge University Press, England.
[23]
Song, R. L., Liu, J. X., Hou, C. H., et al., 2012, Numerical simulation of Sector Bond log and improved cement bond image: Geophysics, 77(4), D95−D104.
[24]
Wang, T., and Tang, X. M., 2003, Finite-difference modeling of elastic wave propagation: A nonsplitting perfectly matched layer approach: Geophysics, 68(5), 1749−1755.
[25]
Wei, T., 2010, Evaluation of oil and gas well cementing quality: Petroleum Industry Press, China, 1-5.
[26]
Zeroug, S., and Froelich , B., 2003, Ultrasonic leaky- Lamb wave imaging through a highly contrasting layer: IEEE Microwave and Guided Wave Letters, 11(5), 794-798.
0, Vol. 
