模块外径对套管刻度井声波测井的影响

从几何声学理论和波动声学理论的不同角度分析了套管刻度井的模块外径对源距为1．5m的声波测井的影响，根据实际工程的需要提出了应用于不同刻度井目的的3个模块径向厚度临界值。对于以刻度声幅测井仪器为目的的刻度井，其模块半径不得小于50cm。对于以刻度变密度声波测井仪器为目的的刻度井，若不介意反射纵波对地层滑行横波的影响，其模块半径不得小于100cm；若要避免反射纵波对地层滑行横波的影响但不介意反射纵波对斯通利波的影响，则其模块半径不得小于150cm。

Effects of Outer Diameter of Modeling Well on Acoustic Logging

Effects of outside diameter of modeling well on acoustic logging with 1. 5-m transceiver spacing are analyzed both in geometrical acoustics and in dynamic acoustics which result from the acoustic reflection at the boundary of the modeling well. Three minimums of the outside diameter are suggested for different practical applications. If the modeling well is used to calibrate cement bond logging (CBL) tool, in which only the first arriving wave is measured, the diameter should not be less than 100 cm; If the modeling well is used to calibrate variable density logging (VDL) tool, and the formation shear wave(or Stoneley wave) is not considered, the outside diameter should not be less than 150 cm.