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过套管电阻率测井是在金属套管井中测量泄露到地层中的纳伏级微弱信号,因不同仪器的微弱信号检测和处理能力不同,其测量范围和测量精度也不同。从理论和室内实验2个方面探讨了俄罗斯ЭКOC-31-7仪器的测量范围和测量误差。俄罗斯ЭКOC-31-7仪器测量范围为1～200Ω.m,测量平均相对误差小于±10%;当地层电阻率逐渐增大时,仪器测量的最大相对误差逐渐增大,对于电阻率小于60Ω.m的低电阻率地层,仪器测量准确度相对较高;否则,仪器测量准确度相对较低,重复测量求取平均值可以提高仪器测量的准确度。
Through the casing resistivity logging is measured in the metal cased hole leak into the formation of sub-nanoscale weak signal, due to different instruments weak signal detection and processing capabilities, the measurement range and measurement accuracy are also different. The measuring range and measurement error of Russia ЭКOC-31-7 instrument are discussed from two aspects of theory and laboratory experiment. Russia ЭКOC-31-7 instrument measuring range of 1 ~ 200Ω.m, the average relative measurement error less than ± 10%; gradually increase the formation resistivity, the maximum relative error of the instrument measurement gradually increased, for the resistivity of less than 60Ω. m low resistivity formation, the instrument measurement accuracy is relatively high; Otherwise, the measurement accuracy of the instrument is relatively low, repeated measurements to obtain the average can improve the accuracy of the instrument measurement.