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Sensors 2017, 17(8), 1836; https://doi.org/10.3390/s17081836

Auxiliary Sensor-Based Borehole Transient Electromagnetic System for the Nondestructive Inspection of Multipipe Strings

1
Key Laboratory of Education Ministry for Photoelectric Logging and Detecting of Oil and Gas, Xi’an Shiyou University, Xi’an 710065, China
2
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Received: 18 June 2017 / Revised: 4 August 2017 / Accepted: 8 August 2017 / Published: 9 August 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
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Abstract

Transient electromagnetic (TEM) techniques are widely used in the field of geophysical prospecting. In borehole detection, the nondestructive inspection (NDI) of a metal pipe can be performed efficiently using the properties of eddy currents. However, with increasing concern for safety in oil and gas production, more than one string of pipe is used to protect wellbores, which complicates data interpretation. In this paper, an auxiliary sensor-based borehole TEM system for the NDI of multipipe strings is presented. On the basis of the characteristics of the borehole TEM model, we investigate the principle behind the NDI of multipipe strings using multiple time slices of induced electromotive force (EMF) in a single sensor. The results show that the detection performance of NDI is strongly influenced by eddy-current diffusion in the longitudinal direction. To solve this problem, we used time slices of the induced EMF in both the main and auxiliary sensors. The performance of the proposed system was verified by applying it to an oil well with a production casing and liner. Moreover, field experiments were conducted, and the results demonstrate the effectiveness of the proposed method. View Full-Text
Keywords: auxiliary sensor; transient electromagnetic techniques; borehole; nondestructive inspection auxiliary sensor; transient electromagnetic techniques; borehole; nondestructive inspection
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Dang, B.; Yang, L.; Du, N.; Liu, C.; Dang, R.; Wang, B.; Xie, Y. Auxiliary Sensor-Based Borehole Transient Electromagnetic System for the Nondestructive Inspection of Multipipe Strings. Sensors 2017, 17, 1836.

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