A new approach for processing the variable density log signal using frequency-time analysis

Abstract

Cementing is a common practice in drilling and completion of each well, and it is necessary to evaluate how to bonding the cement in this operation. So far, all the methods used to evaluate the extent and how to bonding the cement is eye-catching. Due to the fact that most of the signals are non-stationary, time-frequency analysis methods are among the best methods, the most important of which is the short-time Fourier transform and continuous wavelet transform. Due to the problem of the dispersion of the signal components in these two transformations, the conversion of synchrosqueezing by fixing this limit, it has achieved better results. In this paper, using these transformations, various modes of VDL sonic signaling, which is a criterion for evaluating the quality of cement bond, are investigated. The data used in this article is related to the South Yarran Field to a depth of 2294.5 m located in Ahvaz, Iran.