基于瞬变电磁法的过套管电阻率测井技术

Through-Casing Resistivity Logging Technology Based on Transient Electromagnetic Method

摘要: 针对普光高含硫气井水侵问题，脉冲中子类饱和度测井技术探测深度浅、因素影响大，传统电极推靠式过套管电阻率仪器外径大，无法在普光应用的现状，本文研究了一种基于瞬变电磁原理的非接触式小直径过套管电阻率测井系统设计，形成了电阻率预测模型及计算方法，实现了过套管电阻率测井技术在高含硫气井一体化管柱条件下的应用，现场应用测试成功率100%，电阻率计算准确率大于80%。结果表明：基于瞬变电磁的过套管电阻率测井技术可有效表征地层信息，达到识别地层界面的目的，为气水分布奠定良好基础。

Abstract: To address the water invasion issue in high-sulfur gas wells in the Puguang field, conventional pulsed neutron saturation logging technologies suffer from shallow detection depth and significant influencing factors, while traditional electrode-based through-casing resistivity tools have large diameters and cannot be applied in Puguang. This paper presents the design of a non-contact, small-diameter through-casing resistivity logging system based on transient electromagnetic principles. A resistivity prediction model and calculation method were developed, enabling the application of through-casing resistivity logging technology in high-sulfur gas wells with integrated tubing conditions. Field tests achieved a 100% success rate, with resistivity calculation accuracy exceeding 80%. The results demonstrate that transient electromagnetic-based through-casing resistivity logging can effectively characterize formation information, identify formation boundaries, and provide a solid foundation for gas-water distribution analysis.