Ultrasonic leaky-lamb wave imaging through a highly contrasting layer

Zeroug, Smaine; Froelich, B.

doi:10.1109/ultsym.2003.1293520

Cited by 30 publications

(19 citation statements)

References 3 publications

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“…Zeroug and Froelich (2003) and van Kuijk et al (2005). When the two pipes are so close as to be almost touching, it becomes difficult to distinguish the primary and secondary pulses.…”

Section: Series 2: Variation Of Casing Standoffmentioning

confidence: 97%

“…Thus, we use the same combination of frequency and incidence angle as Tian et al (2011) reported for a real tool in a specific logging case. From Zeroug and Froelich (2003), this combination of frequency and incidence angle ensures that the flexural A0 mode is cleanly excited with little contribution from other modes. As the reflection coefficient curves shown in that article were made for plane-wave incidence, our wavefronts mandate an extra margin of safety in the choice of frequency and transducer angle.…”

Section: Simulation Setupmentioning

confidence: 99%

“…by van Kuijk et al (2005). The arrival time of this wave packet can be used to determine the position of the outer interface, as shown by Zeroug and Froelich (2003) and van Kuijk et al (2005), and it has been shown by He et al (2014) that its amplitude is affected by debonding in the A-annulus.…”

Section: Introductionmentioning

confidence: 99%

“…Hayman et al (1991) and Wright (1993)-and pitch-catch techniques where there is one transmitting transducer and one or more receiving transducers, as described by e.g. Zeroug (2002), Zeroug and Froelich (2003), van Kuijk et al (2005), and van Kuijk et al (2006). A recent review of such ultrasonic techniques is provided by Wang et al (2014).…”

Section: Introductionmentioning

confidence: 99%

“…As done by e.g. Zeroug and Froelich (2003) and He et al (2014), we simplify the geometry by modeling its two-dimensional sagittal cross-section. The analysis uses the signals from the two simulated pitch-catch receivers in the double-casing geometry, meaning that the effects demonstrated in this analysis should also be detectable in a similar physical transducer setup.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and modeling of ultrasonic pitch-catch through-tubing logging

2016

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Cased petroleum wells must be logged to determine the bonding and hydraulic isolation properties of sealing material and to determine the structural integrity status. While ultrasonic pitch-catch logging in single-casing geometries has been widely studied and is commercially available, this is not the case for logging in doublecasing geometries despite its increasing importance in plug and abandonment operations. It is therefore important to investigate whether existing logging tools can be used in such geometries. Using a finite element model of a double-casing geometry with a two-receiver pitch-catch setup, we simulated through-tubing logging, with fluid between the two casings. We found that there appears a cascade of leaky Lamb wave packets on both casings, linked by leaked wavefronts. By varying the geometry and materials in the model, we examined the effect on the pulse received from the second wave packet on the inner casing, sometimes known as the third interface echo. The amplitude of this pulse was found to contain information on the bonded material in the outer annulus. Much stronger amplitude variations were found with two equally thick casings than with a significant thickness difference; relative thickness differences of up to 1/3 were simulated. Finally, we developed a simple mathematical model of the wave packets' time evolution to encapsulate and validate our understanding of the wave packet cascade. This model shows a more complex time evolution in the later wave packets than the exponentially attenuated primary packet which is currently used for single-casing logging. This indicates that tools with more than two receivers, which could measure wave packets' amplitude at more than two points along their time evolution, would be able to draw more information from these later packets. The model was validated against simulations, finding good agreement when the underlying assumptions of the model were satisfied.

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“…Zeroug and Froelich (2003) and van Kuijk et al (2005). When the two pipes are so close as to be almost touching, it becomes difficult to distinguish the primary and secondary pulses.…”

Section: Series 2: Variation Of Casing Standoffmentioning

confidence: 97%

Section: Simulation Setupmentioning

confidence: 99%