Title :
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
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;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2014 17th International Conference on
Conference_Location :
Hangzhou
DOI :
10.1109/ICEMS.2014.7013551
