Open AccessEccentric array-based borehole transient electromagnetic system for NDT of multipipe strings in sidetrack well
Author(s) -
Ling Yang,
Ruirong Dang,
Bo Dang,
Rui Guo
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1894/1/012050
Subject(s) - borehole , casing , nondestructive testing , eccentricity (behavior) , transient (computer programming) , acoustics , engineering , signal (programming language) , petroleum engineering , geology , eccentric , structural engineering , geotechnical engineering , computer science , physics , quantum mechanics , political science , law , programming language , operating system
In the middle and late stage of oilfield development, the sidetracking technology is widely used for restoring the production of stripper well, damaged well and abandoned well. In this paper, we present an eccentric array-based borehole transient electromagnetic (TEM) system for nondestructive testing (NDT) of multipipe strings in sidetrack well. Using the borehole TEM signal model, the response of eccentric sensor is analyzed, which contains more information in the direction of eccentricity. On this basis, multiple eccentric sensors with different depths and different angles are utilized to form an eccentric array, which can be used to determine the direction of sidetracking and to detect the multiple pipes in hanging casing strings. The performance of the proposed system was verified by applying it to sidetrack wells in Shengli oilfield. In addition, field experiments were conducted, and the results demonstrated the effectiveness of the proposed method.