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Optimal design of nuclear magnetic resonance (NMR) logging device sensor can enhance its detection performance and improve signal-to-noise ratio, and the accuracy of results from numerical method is absolutely critical for optimal design. In this paper, an eccentric NMR logging device static field distribution and radio frequency field distribution are simulated by the electromagnetic finite element method, and the influences of model shape, model size and element shape on simulation results are analyzed. A comparison between the measurements and simulation data indicates that they are in good agreement with each other. In the design process of NMR logging device sensor, by choosing a circinal model which is similar to the shape of borehole, setting model size to be 10-15 times the sensor diameter, and adopting triangle element, the accuracy of numerical simulation can be improved and the reliability of optimization design can also be enhanced.
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Keywords:
- NMR logging /
- sensor design /
- finite element method /
- field distribution
[1] Coates G R, Xiao L Z, Prammer M G 1999 NMR Logging Principles and Applications (Houston: Halliburton Energy Services)
[2] Xie R H, Xiao L Z, Wang Z D, Dunn K J 2008 Science in China D Earth Sciences 51 (Suppl. II) 212
[3] Wang X W, Xiao L Z, Xie R H, Zhang Y Z 2006 Science in China G 49 313
[4] Hu H T, Xiao L Z 2010 Chinese J. Magn. Reson. 27 572 (in Chinese) [胡海涛, 肖立志 2010 波谱学杂志 27 572]
[5] Sun B Q, Dunn K J 2005 J. Magn. Reson. 23 259
[6] Xie R H, Xiao L Z 2009 Chinese J. Geophys. 52 2410 (in Chinese) [谢然红, 肖立志 2009 地球 52 2410]
[7] Sun B Q, Dunn K J 2005 J. Magn. Reson. 172 152
[8] Sun B Q, Mark S, Dunn K J 2009 AIP Conf. Proc. 1081 87
[9] Sun B Q, Dunn K J, Clinch S 2010 The Society of Petrophysicists and Well Log Analysts (SPWLA)'s 51st Annual International Conference Perth, June 19-23 2010 YY
[10] Deng L Y, Lan H M, Liu Y 2011 Acta Phys. Sin. 60 025213 (in Chinese) [邓立赟, 蓝红梅, 刘悦 2011 60 025213]
[11] Lu H P, Han M G, Deng L J, Liang D F, Ou Y 2010 Acta Phys. Sin. 59 2090 (in Chinese) [陆海鹏, 韩满贵, 邓龙江, 梁迪飞, 欧雨 2010 59 2090]
[12] Hu H T, Xiao L Z, Wu X L 2011 Chinese J. Magn. Reson. 28 76 (in Chinese) [胡海涛, 肖立志, 吴锡令 2011 波谱学杂志 28 76]
[13] Jin J M 2002 The Finite Element Method in Electromagnetics (2nd Ed.) (New York: Wiley-IEEE Press)
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[1] Coates G R, Xiao L Z, Prammer M G 1999 NMR Logging Principles and Applications (Houston: Halliburton Energy Services)
[2] Xie R H, Xiao L Z, Wang Z D, Dunn K J 2008 Science in China D Earth Sciences 51 (Suppl. II) 212
[3] Wang X W, Xiao L Z, Xie R H, Zhang Y Z 2006 Science in China G 49 313
[4] Hu H T, Xiao L Z 2010 Chinese J. Magn. Reson. 27 572 (in Chinese) [胡海涛, 肖立志 2010 波谱学杂志 27 572]
[5] Sun B Q, Dunn K J 2005 J. Magn. Reson. 23 259
[6] Xie R H, Xiao L Z 2009 Chinese J. Geophys. 52 2410 (in Chinese) [谢然红, 肖立志 2009 地球 52 2410]
[7] Sun B Q, Dunn K J 2005 J. Magn. Reson. 172 152
[8] Sun B Q, Mark S, Dunn K J 2009 AIP Conf. Proc. 1081 87
[9] Sun B Q, Dunn K J, Clinch S 2010 The Society of Petrophysicists and Well Log Analysts (SPWLA)'s 51st Annual International Conference Perth, June 19-23 2010 YY
[10] Deng L Y, Lan H M, Liu Y 2011 Acta Phys. Sin. 60 025213 (in Chinese) [邓立赟, 蓝红梅, 刘悦 2011 60 025213]
[11] Lu H P, Han M G, Deng L J, Liang D F, Ou Y 2010 Acta Phys. Sin. 59 2090 (in Chinese) [陆海鹏, 韩满贵, 邓龙江, 梁迪飞, 欧雨 2010 59 2090]
[12] Hu H T, Xiao L Z, Wu X L 2011 Chinese J. Magn. Reson. 28 76 (in Chinese) [胡海涛, 肖立志, 吴锡令 2011 波谱学杂志 28 76]
[13] Jin J M 2002 The Finite Element Method in Electromagnetics (2nd Ed.) (New York: Wiley-IEEE Press)
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