Research on Acoustic Performance of Deep Exploration Drill Collar Wave Suppression for Impulse Sound Source
The deep detection technology of drilling induced sound source can simultaneously measure the longitudi-nal and transverse waves in geological formations during the drilling process.Its high power,wide frequency band,and high amplitude characteristics are conducive to finely detect the distribution of fractures near the wellbore.Due to the fact that the sound source must be installed on thick walled drill collars,it can excite drill collar waves that propagate along the drill collars,which may mask formation information and have adverse effects on the depth detection of drilling induced sound sources.Therefore,suppressing drill collar waves has become the key to effectively detecting the depth of drilling induced sound sources.By using numerical simulation methods,the acoustic performance changes of the sound insulation body under the slot mode and excitation frequency during the deep detection of drilling induced sound sources are studied.The research results indicate that the grooving method can increase the acoustic attenuation coefficient of drill collar waves.When suppressing low-frequency drill collar waves,the external grooving structure has better sound insula-tion performance.At the same time,the excitation frequency of the sound source center also affects the suppression effect of drill collar waves.
万方数据
维普
