Abstract:The mudcake has been formed in the permeable interval because of mud filtering,resulted in borehole diameter shrink,which has influence on delta time.The paper designed sonic propagation model of three-stratum medium,presented the conception of slide wave of mudcake and refracted slide wave of mudcake in first time and gave the computational formula of delta time when existing mudcake.It is showed by using numeric analytic method to study the rule of traveling time of sonic slide wave changing with thickness of mudeake that the distance from probe of transmitter to probe of receiver controls the source of receiving sonic wave,the common sonic logging apparatus with 1m source distance always receives the refracted slide wave of mudcake and the correction of mudcake is not needed when the thickness of mudcake is uniform and isotropic.The thickness of mudcake has influence on sonic wave received by sonic logging apparatus when reducing source distance to improve the resolution of sonic wave.
隋志强. 声波测井中泥饼折射滑行波分析方法初探[J]. 石油地球物理勘探, 2008, 43(3): 340-342.
Sui Zhi-qiang. Preliminary analysis on refracted slide wave of mudcake in sonic logging. OGP, 2008, 43(3): 340-342.