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- W2374904920 abstract "Thickness reversion method of water layer from one dimension reflective data in ultrasonic reflective cement bond logging is theoretically studied when the first interface is bad bonded. The signal to noise of the useful signal of objective layers is greatly improved by reflective coefficients in the window of resonance and transmission. The thickness of inner medium (water and cement) appears phase shift φ(ω)=nπ+φ 0(ω) . The formula of n is obtained with the main value of the arctangent functions of phase shift. The quality of the integer of n is expressed as the reversion criterion of convergence. Under the excepted thickness of water layer and cement layer, all the parameters are known, the thickness reversion of water layer is made with one path synthetic reflective signal by means of Newton iteration method. When the thickness of water layer is several millimeters, satisfied results are obtained. The precision of the inversion result is not sensitive to the selection of initial value so that the feasibility of the reversion method is proved preliminarily." @default.
- W2374904920 created "2016-06-24" @default.
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- W2374904920 date "2000-01-01" @default.
- W2374904920 modified "2023-09-28" @default.
- W2374904920 title "Thickness Reversion Method of Water Layer Behind High Acoustic Impedance from One dimension Reflective Data" @default.
- W2374904920 hasPublicationYear "2000" @default.
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