目前,水平井在随钻过程中不能同时进行声波测井,无法得到精细的时深关系.而水平井着陆过程中,对深度预测精度要求非常高.在速度横向变化快的区域,传统借用探井的时深关系预测深度的方法,其精度根本无法满足需求.基于支持向量机的声波曲线预测技术可以根据已有的泥质含量曲线和电阻曲线预测出声波曲线,制作合成地震记录,得到精细的时深关系,该方法相对传统方法精度大幅提高.此方法运用于渤海A油田水平井W5H着陆过程中,预测深度与实钻深度只差2m,保证水平井顺利着陆,取得了实际的应用效果.%Currently,horizontal wells can't be performed in acoustic logging in the drilling process,and hence fine time-depth relationship cannot be obtained.When the horizontal wells make landing,the requirement of accuracy of depth prediction is very high.In the region of rapid lateral velocity change,the traditional methods utilize the time-depth relationship of exploratory wells to predict depth,and its accuracy can't meet the requirement.The technology of predicting acoustic logging data based on support vector machine can predict sonic curve in accordance with the existing shale content curve and resistivity curve,making synthetic seismogram and getting fine deep relationship,which could greatly improve accuracy relative to traditional methods.This method was applied to the W5H landing of Oilfield A of Bohai Sea,and the difference between the predicted depth and the actual drilling depth was only 2 m,thus ensuring horizontal wells' successfully landing,and achieving practical application effect.
展开▼
