由于慢地层横波速度测量困难,数值考察了多极子声源在裸眼井和随钻测井环境中激发的声场波形。随钻测井环境中,偶极子和四极子声源都能在快地层井孔中激发出携带地层横波信息的地层振型。研究表明在慢地层,偶极子声源激发的钻铤振型严重干扰地层横波波速的测量,低频四极子声源在慢地层井眼中则不会激发出钻铤振型。
source is inv Since it is difficult to measurement the velocity of shear wave, the full waveform of LWD multi-pole estigated numerically. In LWD environment,dipole and of shear wave in fast formations. In quadrupole source could measurement velocity excites the collar mode wave disturbing the measurement of shear wave, while quadrupole source could excite the mode wave of formations to measurement the velocity of shear wave.