ЭКOC-31-7过套管电阻率测井仪器测量范围和精度探讨

Study on the Measurement Range and Accuracy of Russian ЭКOC-31-7 Through Casing Resistivity Logging Tool

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 casing resistivity logging tool detects the weak signals of nV level mation through the metal casing. Due to the ability of the weak signal detection and different for different tools, the range and accuracy of t are also different. leaking to the for- data processing are The range and er-ror of measurement of the Russian ЭKC-31-7 tool are investigated with theory and laboratory test. The results show that the measurement range of Russian ЭKC-31-7 tool is 1-200Ω·m, the average rela- tive error is less than -t- 10%. When resistivity gradually rises, the maximum relative error of the tool also gradually increases, The measurement accuracy of the tool is relatively high for low resistivity for-mation when the resistivity is less than 60 Ω·m otherwise the measurement accuracy of the tool is relatively low. Measurement accuracy of the tool can be improved by calculating the average re-sistivity through repeated measurements. This study has guiding significance for log operations and data interpretation of the Russian ЭKC-31-7 tool.