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陈德华 ,王秀明 ,于 ,侯春会 .套管刻度井中模拟地层及吸声材料对井内声场的影响 .测井技术 ,2 0 0 0 ,2 4(1) :2 0～2 6研究套管刻度井中模拟地层有限时井孔声波的传播特点。采用实轴积分法计算了该刻度井中由居中点声源激发的全波列 ,分析了刻度井几何尺寸、介质特性以及不同的外边界吸声材料对井孔声场的影响。数值结果表明 :在源距为 1.0～ 1.5 m、声源中心频率为 10～ 2 0 k Hz时 ,只有当模拟地层的半径大于 1.5 m时 ,模拟井中的主要波列才不受最外层边界的影响 ,这种影响的程度还取决于最外层介质与模拟地层的波阻抗差别大小及它们的吸收特性 ;当其半径小于 1.0 m时 ,边界的影响不容忽略
CHEN De-hua, WANG Xiu-ming, YU Yu, HOU Chun-hui .Effects of Simulated Formation and Sound Absorbing Material on Sound Field in a Well of a Casing Calibration Well Logging Technology, 2000, 24 (1): 20 ~ Propagation characteristics of well borehole acoustic wave with limited finite depth in simulated well formation. The real-axis integral method was used to calculate the full-wave column excited by the mid-point sound source in the calibrated well. The influence of the geometrical size of the calibrated well, the characteristics of the medium and the different outer boundary acoustic absorbent materials on the well bore sound field was analyzed. The numerical results show that when the source distance is 1.0 ~ 1.5 m and the center frequency of the sound source is 10 ~ 20 k Hz, the main wave train in the simulated well is not affected by the outermost boundary only when the radius of the simulated formation is more than 1.5 m The extent of this influence also depends on the difference of the wave impedance between the outermost medium and the simulated formation and their absorption characteristics. When the radius is less than 1.0 m, the influence of the boundary can not be neglected