过套管地层电阻率测井水泥环校正方法研究

Method for Cement Sheath Correction for Through-casing Formation Sensitivity Logging

过套管地层电阻率测井的测量方法及其测量仪器的设计都是以传输线模型为基础的,但是实际测量环境的条件比假设条件——套管均匀,纵向分层均匀,径向无限均匀的传输线模型复杂得多,而且传输线模型中未考虑水泥环,因此众多非均匀因素及水泥环都会对过套管地层电阻率测量结果产生影响。通过研究水泥环对过套管电阻率测井的影响,可以得出该影响因素的响应规律,并在此基础上进行了相应的水泥环校正研究,进一步提高了过套管电阻率测井解释结果的准确性。

The design of measuring method of through-casing sensitivity logging and its measuring tool was based on transmission linear model, but the actual measuring condition was much more complex than that of assumed conditions, such as casing uniform, vertical zoning uniform and radial infinite uniformed transmission linear model, while in transmission linear model, cement sheath was not considered. For these uneven factors and cement sheath, influence was induced on the results of measurements of through-casing formation sensitivity logging. By studying the effect on through-casing sensitivity logging caused by cement sheath, the rules are obtained for influential factors. On the basis of studying cement sheath correction, the accuracy of logging interpreting is further improved.