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《Chinese Journal of Geophysics》 2015-01
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Finite-difference numerical simulation and analysis on nonaxisymmetric acoustic fields in cased borehole

CHEN Xue-Lian;TANG Xiao-Ming;ZHANG Cong-Hui;WEI Tao;DONG Xing-Meng;WEI Zhou-Tuo;School of Geosciences,China University of Petroleum;Oilfield Technology Department,China Oilfield Services Limited;  
It is difficult to evaluate the cement bonding quality between the cement and the formation.Cased-hole sidewall acoustic logging tools have been widely used in cement bonding quality evaluation.The feasibility is verified using the waveform data,which is recorded by cased-hole sidewall acoustic logging tool,to evaluate the cement bonding quality between the cement and the formation.The acoustic field excited by cased-hole sidewall acoustic logging tool is non-axisymmetric.This work applies the 3Dinterleaved grid high-order finite difference method to study the characteristics of the non-axisymmetric acoustic field excited by a source on the fluid-filled casedhole sidewall,which provides a numerical simulation method to simulate the wave field excited by a source on the sidewall of the casing pipe.The model size is 0.4m×0.4m×0.8m.Cased-hole sidewall acoustic logging tool is regarded as the SBT(Segmented Bond Tool).There are six pads uniformly positioned in contact with the interior casing wall. They provide compensated attenuation measurement.The model consists of water,six pads,casing pipe,cement annulus,and formation from inner to outer.The outer diameter and thickness of casing pipe are 0.178 m and 0.01 m,respectively.The thickness of the cement annulus is 0.04 m.The finite differential grid spacing and time step are 0.001 mand 0.0834μs,respectively.The cosine envelope pulse source of the central frequency of 100 kHz is used.The simulation results show that the existence of the sidewall pad with the source significantly suppresses the amplitude of flexural(asymmetric)Lamb waves in the casing pipe,and the amplitude of extensional(symmetric)Lamb waves is relatively enhanced.So a logging tool has a great effect on casing waves,and should be considered in numerical simulation.The simulated waveforms are in good agreement with the full waveforms recorded by the SBT.The dispersion curves of extensional and flexural waves extracted from the simulated waveforms are consistent with analytical dispersion curves.The waveforms and the snapshots are simulated.The snapshots show that the extensional Lamb waves can radiate cement compressional waves and shear waves into the cement,which generate reflection at the second interface of the cement sheath.A comparison of waveforms between the bonded condition and debonded condition demonstrates that the amplitude and phase characteristics of the reflected waves from the interface between cement and formation indicate the bonded conditions.If the second interface of the cement sheath is a debonded condition,the amplitude of reflected waves increases.The simulated results provide a theoretical foundation for using the recording waveforms to evaluate cement bonding quality of the cement-sheath second interface.The debonded condition is modeled using a 5mm-thick water annulus between cement and formation.Finite-difference numerical simulation and analysis on non-axisymmetric acoustic fields of cased borehole can be regarded as the beginning of developing potential applications of the sidewall acoustic logging tools.By analyzing numerical simulation results,we can conclude that the cement bond integrity in six angular segments around the second interface between cement and formation can be evaluated by the recorded waveforms.Further study on processing methods should be carried out.
【Fund】: 国家自然科学基金资助项目(40804020);; 中央高校基本科研业务费项资金(14CX05010A)资助
【CateGory Index】: P631.81
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