Induction logging through casing (ILTC) is of significant importance to the evaluation of residual oils. Traditional induction logging fails to work in cased wells due to the shielding effect of metallic casings. To date, the feasibility of ILTC remains an open question. In this article, we propose an ILTC based on the detection of lateral waves that carry the formation information. Based on the analytical equations derived to describe the hybrid modes of total magnetic fields that can be detected inside cased wells, numerical analyses aiming to describe the behavior of lateral waves were carried out in both frequency and time domains. The obtained results comply with full-wave simulations and existing scaled experiments. Our results indicate that if an ILTC tool can be properly configured to work in a region dominated by lateral waves, and the casing effect and the primary field of the lateral waves can be effectively compensated, it is feasible to implement an ILTC to detect formation conductivities ranging from 0.01 to 5 S/m.

中文翻译：

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通过探测横向波通过套管进行感应测井：数值分析

套管感应测井 (ILTC) 对残余油的评价具有重要意义。由于金属套管的屏蔽作用，传统的感应测井无法在套管井中工作。迄今为止，ILTC 的可行性仍然是一个悬而未决的问题。在本文中，我们提出了一种基于检测携带地层信息的横波的 ILTC。基于用于描述套管井内可检测到的总磁场混合模式的解析方程，在频域和时域中进行了旨在描述横向波行为的数值分析。获得的结果符合全波模拟和现有的比例实验。我们的结果表明，如果 ILTC 工具可以正确配置以在横向波主导的区域工作，