Induction Logging Through Casing by Detecting Lateral Waves: A Numerical Analysis

Induction Logging Through Casing by Detecting Lateral Waves: A Numerical Analysis
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通过检测横向波进行套管感应测井:数值分析

DOI:
10.1109/tgrs.2019.2958096
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发表时间:
2020-04
影响因子:
8.2
通讯作者:
Lixin Ran
Lixin Ran
中科院分区:
工程技术1区
文献类型:
--
作者:
Fazhong Shen;Huan Li;Kuiwen Xu;Tianyi Zhou;Nazar Muhammad Idrees;Changzhi Li;Lixin Ran

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过套管感应测井对剩余油评价具有重要意义。由于金属套管的屏蔽作用,传统的感应测井无法在套管威尔斯井中进行。到目前为止,ILTC的可行性仍然是一个悬而未决的问题。在这篇文章中,我们提出了一个ILTC的基础上进行地层信息的横向波检测。基于推导出的描述套管威尔斯井内可探测的总磁场混合模式的解析方程,在频域和时域上对侧向波的行为进行了数值分析。所得结果符合全波模拟和现有的缩放实验。研究结果表明,如果ILTC仪器能在侧向波占主导地位的区域工作,并能有效补偿套管效应和侧向波的一次场,那么实现ILTC探测电导率在0.01 ~ 5S/m范围内的地层是可行的。
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.
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