A Theoretical Model of Residual Magnetic Field around a Pre-Magnetized Casing String

Yucai Shi, Dongyue Jia, Zhichuan Guan, Yuqiang Xu, Weixing Yang and Duanrui Zhang
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Yucai Shi: State Energy Research and Development Center for Shale Oil (Branch Center of China University of Petroleum), Qingdao 266580, China
Dongyue Jia: State Energy Research and Development Center for Shale Oil (Branch Center of China University of Petroleum), Qingdao 266580, China
Zhichuan Guan: State Energy Research and Development Center for Shale Oil (Branch Center of China University of Petroleum), Qingdao 266580, China
Yuqiang Xu: State Energy Research and Development Center for Shale Oil (Branch Center of China University of Petroleum), Qingdao 266580, China
Weixing Yang: SINOPEC Northwest Oilfield Company, Urumqi 830011, China
Duanrui Zhang: CNPC Tarim Oilfield Company, Korla 841000, China

Energies, 2020, vol. 13, issue 16, 1-11

Abstract: In the field of petroleum drilling engineering, passive magnetic ranging technology is generally used for specialized drilling operations such as connecting relief wells, preventing wellbore collisions, guiding parallel horizontal wells, etc. Although pre-magnetized casing strings have been used to improve the detection distance and accuracy, the theoretical mechanism is not well understood. Based on the equivalent current model of a permanent magnet, a theoretical magnetic field model around the pre-magnetized casing string was established by using the vector potential method and vector superposition principle and validated by the COMSOL Multiphysics software. Our results show that connecting pre-magnetized individual casings with homogeneous magnetic poles can enlarge the magnetic induction intensity around the total casing string. Furthermore, the magnitude close to the casing coupling is significantly larger than that close to the middle of the individual casing. Connecting pre-magnetized individual casings with heterogeneous magnetic poles results in a low magnetic induction intensity around the total casing string. In order to improve the detection distance and accuracy of the magnetic ranging, the pre-magnetized individual casings should be connected with homogeneous magnetic poles. The results of this study can provide guidelines for the development of passive magnetic ranging technology.

Keywords: passive magnetic ranging method; casing string; magnetizing; magnetic field model; vector magnetic potential method; magnetic induction intensity; COMSOL multiphysics software (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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