Simulation and inversion of ultrasonic pitch-catch through-tubing well logging with an array of receivers

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• 作者：Erlend Magnus Viggen^a ; ^{erlendmagnus.viggen@sintef.no} ; Tonni Franke Johansen^a ; Ioan-Alexandru Merciu^b
• 关键词：Well logging ; Ultrasonic pitch-catch measurement ; Finite element simulation ; Mathematical modelling ; Inversion
• 刊名：NDT & E International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：85
• 期：Complete
• 页码：72-75
• 全文大小：695 K
• 卷排序：85

文摘

Current methods for ultrasonic pitch-catch well logging use two receivers to log the bonded material outside a single casing. For two casings separated by a fluid, we find by simulation that increasing the number of receivers provides a better picture of the effect of the bonded material outside the second casing. Inverting simulated measurements with five receivers, using a simulated annealing algorithm and a simple forward model, we find for a subset of simulations that we can estimate the impedance of the material outside the outer casing.