流体流动的核磁共振（NMR）在线测量是一种高效、无损的探测方式，可广泛应用于管道流体输送过程、化学反应动态流程、河流流动等具有时移变化特点的过程在线检测.但是流动状态下样品流速会对NMR测量造成诸如磁化时间不充分、采集信号损失等不容忽视的影响.通过量化分析流动状态对NMR测量的影响因素，提出回波串校正方法，实现流动状态下的NMR流体测量.
陶冶
,
耿东士
,
王梦颖
,
肖立志
,
邓峰
. 流动速度对核磁共振在线测量的影响及校正[J]. 波谱学杂志, 2017
, 34(1)
: 78
-86
.
DOI: 10.11938/cjmr20170110
NMR measurement of flowing fluid is a highly effective and non-destructive online detection method, which can be widely used in pipeline fluid delivery process, chemical reaction process, river flowing process and other time-shift processes. However, flow will induce incomplete polarization and incomplete signal acquisition, such that the effects of flow rate on NMR measurement cannot be ignored. In this work, we analyzed quantitatively how factors related to the flowing state affect NMR measurement. Correction methods were proposed to achieve accurate NMR flowing fluid measurements.
[1] COATS G R, XIAO L Z, PRAMMER M G. NMR logging principles and applications[M]. Houston:Gulf Professional Publishing, 1999.
[2] CASANOVA F, PERLO J, BLÜMICH B. Single-sided NMR[M]. New York:Springer, 2011.
[3] MATZKANIN G A. A review of nondestructive of composites using NMR, in:nondestructive characterization of materials[M]. Berlin:Springer, 1989.
[4] SURYAN J R. Nuclear resonance in flowing liquids[J]. Proc Indian Acad Sci Sect, 1951, 33:107-111.
[5] CAPRIHAN A, FUKUSHIMA E. Flow measurements by NMR[J]. Phys Rep, 1990, 198(4):195-235.
[6] SINGER J R. Blood flow rates by nuclear magnetic resonance measurements[J]. Science, 2013, 130(3389):1652-1653.
[7] AKKURT R. Effects of motion in pulsed NMR logging[D]. Colorado:Colorado School of Mines, 1990.
[8] EDWARDS C M. Effect of tool design and logging speed on T2 NMR log data[C]. Houston:SPWLA's 38th Annual Logging Symposium, 1997.
[9] MASAK P C, BOUTON J, PRAMMER M G, et al. Field test results and applications of the downhole magnetic resonance fluid analyzer[C]. Oiso:SPWLA 43rd Annual Logging Symposium, 2013.
[10] LIU S H, XIAO L Z, HU F L, et al. Studies on NMR logging responses at formation boundary[J]. Chinese Journal of Geophysics, 2008, 54(4):1262-1269. 刘双惠, 肖立志, 湖法龙, 等. 核磁共振测井地层界面响应特征研究[J]. 地球物理学报, 2008, 54(4):1262-1269.
[11] CHANH C M, JACK L, STEVEN C, et al. Methods and systems for applying speed correction to NMR echo data. U.S. 2012/0025820 A1[P]. 2012.
[12] DENG F, XIAO L Z, LIU H B, et al. Effects and corrections for mobile NMR measurement[J]. Appl Magn Reson, 2013, 44(49):1053-1065.
[13] KOCHIN N E, KIBEL' I A, ROZE N V. Theoretical hydromechanics[J]. Phys Today, 2009, 19(3):76.
[14] BINGHAM E C. Fluidity And plasticity[M]. USA:McGraw-Hill Book Co. 1922.
[15] CASSON N. A flow equation for pigment oil-suspen-sions of the printing ink type[M]. London:Pergamon Press, 1959.
[16] HERSCHEL W H, BULKLEY R. Measurement of consistency as applied to rubber-benzene solutions:29th Annual Meeting of the American Society Testing Materials Atlantic City[C]. Proc ASTM, 1926, 26(Ⅱ):621-633.
[17] BLOCH F. Nuclear induction[J]. Phys Rev, 1946, 70(7, 8):460-474.
[18] LI X, WANG Z Z, LI S G, et al. Analysis and optimization of pre-polarization methodology for NMR logging[J]. Journal of China University of Petroleum, 2014, 38(5):75-81. 李新, 王志战, 李三国, 等. 核磁共振测井的预极化分析与优化[J]. 中国石油大学学报(自然科学版), 2014, 38(5):75-81.
[19] ADOLPHI N L, MCDOWELL A F. NMR, instrumentation, and flow meter/controller continuously detecting MR signals, from continuously flowing sample material:US8710836[P]. 2014.
[20] MITCHELL J, HÜRLIMANN M D, FORDHAM E J. A rapid measurement of T1/T2:the DECPMG sequence.[J]. J Magn Reson, 2009, 200(2):198-206.
[21] SONG Y Q. Magnetic resonance at low magnetic field:multi-dimensional experiment of relaxation and diffusion[C]. Hang Zhou:Proceedings of the 18th national magnetic resonance conference, 2014.
[22] DENG F, XIAO L Z, CHEN W L, et al. Rapid determination of fluid viscosity using low-field two- dimensional NMR[J]. J Magn Reson, 2014, 247:1-8.
