Design of a permanent magnet configuration for nuclear magnetic resonance logging

Author

Yanli Zhang ; Xin Geng ; Dianhai Zhang ; Dexin Xie

Author_Institution

Sch. of Electr. Eng., Shenyang Univ. of Technol., Shenyang, China

fYear

2014

fDate

22-25 Oct. 2014

Firstpage

664

Lastpage

668

Abstract

Nuclear magnetic resonance logging (NMRL) as one kind of oil- and gas- detecting logging tools has been widely applied to commercial logging, and the magnet of the sensor mainly adopts permanent magnet (PM) configuration. MRIL-Prime and Combinable MR sensor are typical examples of two logging modes for NMR logging. By comparing these two structures and analyzing the magnetic field performance in the detection region, an improved PM configuration is proposed. Through simulating the magnetic field distribution characteristics of the proposed magnet structure, the detecting depth and other technical specifications are summarized and its advantages are presented. According to the technical specifications, the proposed magnet structure is optimized.

Keywords

NMR imaging; magnetic field measurement; magnetic sensors; natural gas technology; permanent magnets; well logging; MRIL-prime MR sensor; NMRL; combinable MR sensor; gas-detecting logging tool; magnetic field distribution characteristic simulation; magnetic field performance analysis; nuclear magnetic resonance logging; oil-detecting logging tool; permanent magnet configuration; sensor magnet; Magnetic analysis; Magnetic cores; Magnetic fields; Magnetic resonance imaging; Nuclear magnetic resonance; Optimization;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Machines and Systems (ICEMS), 2014 17th International Conference on

Conference_Location

Hangzhou

Type

conf

DOI

10.1109/ICEMS.2014.7013551

Filename

7013551