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为了突破目前声波远探测技术存在的局限性,提出了一种新的偶极横波远探测方法,即利用井中偶极子产生的井中弯曲波存在低频截止频率的现象,在声源截止频率以下激发偶极声波.通过对比分析井中偶极声源分别在截止频率上、下激发时,井孔内外产生的辐射声场,明确了截止频率以下井中偶极声源的远场辐射特征和低频截止频率激发偶极横波的优势,结合数值模拟,进一步对其反射声场进行了分析.结果表明,该方法可以避免艾里相的巨大振幅对数据量化产生的“饱和”效应,相比传统的远探测测井方式更具优势,常规源距即可满足专门的远探测测井仪器需求.
In order to overcome the limitations of the current acoustic detection technology, a new dipole transverse wave detection method is proposed, in which the phenomenon of low frequency cutoff frequency of bending waves in a well generated by a dipole in a well excites below the cut-off frequency of the sound source Dipole sound.The far-field radiation characteristics and the low-frequency cut-off frequency excitation of the dipole sound source in the well below the cut-off frequency are clarified by contrastively analyzing the radiation field generated by the dipole sound source in and out of the wellbore at the upper and lower excitation frequencies of the cutoff frequency respectively Dipole-shear-wave and the numerical simulation are used to analyze the reflected sound field.The results show that this method can avoid the “saturation” effect caused by the large amplitude of Airy phase in data quantification, compared with the traditional far-sounding Logging more advantages, the conventional source distance to meet the needs of specialized far-exploration logging tools.