摘要
利用有限元数值模拟研究了由点源组成的相控线阵声波测井辐射器对充液井孔中各种波动模式波的影响,重点分析了阵元个数对各种波动模式波响应幅度的影响。结果表明,随着阵元间延迟时间的增加,声束偏转角逐渐增加。控制声束偏转角分别满足相控线阵辐射声束在纵、横波临界角位置入射时,随相控线阵阵元个数增加,折射纵、横波响应幅度呈正比增加;在非临界角入射时,阵元个数的增加对折射纵、横波能量的增强效果不明显。当阵元个数不变时,随声束偏转角的增加,纵、横波声压值也开始逐渐增加,且在偏转角分别等于第一或第二临界角时达到最大;若偏转角再继续增加,声压值又会逐渐减弱。
Effects of the acoustic logging transmitter of linear phased array composed of point source on waves of various modes in fluid-filled borehole were studied by finite element method （FEM）. And the influence of element number of array on wave amplitude was mainly analyzed. The results show that the steered angle of acoustic arrays increases with the delay time increasing between the neighbour elements. When the angle of radiated acoustic beam steered to the critical angle of the compressional or shear wave, the amplitude of the compressional or shear wave can increase in direct ratio with the element number of the phased array. If the steered angle of radiated acoustic beam departs from the critical angle of the compressional or shear wave in other controlled delay time, the enhancement of the amplitudes is little. And when the element number is changeless, the amplitude of the compressional or shear wave can be strengthened gradually with the steered angle increasing. But when the steered angle exceeds the critical angle, the amplitude will be lowered with the steered angle increasing sequentially.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第3期46-49,共4页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金资助项目(40374049)
CNPC测井重点实验室资助项目
关键词
相控线阵声波辐射器
声波测井
有限元法
阵元个数
偏转角
linear phased array acoustic transmitter
acoustic logging
finite element method
element number of array
steered angle
作者简介
陈雪莲（1976-），女（汉族），河北衡水人，博士研究生，主要从事声波测井方法研究。
