A Novel Method for NMR Ringing Reduction under Downhole Condition

Abstract

Abstract:

In NMR logging, the noise amplitude of ringing is often high, impacting echo signals detection. The phase-alternate pulse sequence (PAPS) technique is a conventional method to reduce NMR ringing. However, the amplitude of ringing is frequency-dependent, and the PAPS technique is effective at certain frequency, leading to a lower vertical resolution. Taking advantage of the feature that the echo signals change with the variation of RF pulse wherase the ringing noise keeps constant, we proposed a novel method, combining PAPS and stackingbetweenechoes, to reduce NMR ringing under downhole condition. The results showed that this method has improved efficiency. The echo train measured by the new method had the characters of high SNR and high vertical resolution compared to that measured by the PAPS technique, and the stacking between the echo trains was not limited to one frequency.

Key words: NMR, ringing, pulse sequence, logging, PAPS, vertical resolution

CLC Number:

P631.8

HUANG Ke, XIAO Li-Zhi, LI Xin. A Novel Method for NMR Ringing Reduction under Downhole Condition[J]. Chinese Journal of Magnetic Resonance, 2012, 29(1): 42-50.

References

[1] Coates G R, Xiao L Z, Prammer M G. NMR Logging Principles and Applications[M]. Houston: Gulf Publishing Company, 1999.

[2] Fukushima E, Roeder S B W. Spurious ringing in pulse NMR[J]. J Magn Reson, 1979, 33: 199-203.

[3] Fukushima E, Roeder S B W. Experimental Pulse NMR, a Nuts and Bolts Approach[M]. Addison-Wesley Publishing Company, 1981.

[4] Sigal R F, Miller D L, Galford J E, et al. A nethod for enhancing thevertical resolution of NMR logs[C]. Society of Petroleum Engineers, 2000. SPE 63215.

[5] Akkurt R, Cherry R. The key to improving the vertical resolution of multi-Frequency NMR logging tools[C]. SPWLA 42^th Annual Logging Symposium, 2001-YY.

[6] Sun B, Taherian R. Method for eliminating ring during a nuclear magnetic resonance measurement: U.S., 6,121,774[P]. 2000.

[7] Beard D R, Georgi D T. Method and apparatus for correcting ringing in NMR signals: U.S., 7,126,333[P]. 2006.

[8] Edwards C M, Chen S. Improved NMR well logs from time-dependent echo filtering[C]. SPWLA 37^th Annual Logging Symposium, 1996-RR.

[9] Che Wen-hua(车文华), Zhang Yi-ming(张一鸣), Xia Ping-chou(夏平畴). An improved measuring pulse sequence for NMR logging(一种改进的核磁共振测井测重脉冲序列)[J]. Chinese J Magn Reson(波谱学杂志), 2000, 17(3): 177-182.

[10] Hurlimann M D, Terneaud O J, Freed D, et al. Nuclear magnetic resonance methods for extracting information about a fluid in a rock: U.S., 6,597,171[P]. 2003.

[11] Xiao Li-zhi(肖立志). Magnetic Resonance Imaging Logging and Rock’s Magnetic Resonance and Its Application(核磁共振成像测井与岩石核磁共振及其应用)[M]. Beijing(北京): Science Press(科学出版社), 1998.

[12] Hu Hai-tao(胡海涛), Xiao Li-zhi(肖立志). Investigation characteristics of NMR wireline logging tools(电缆核磁共振测井仪探测特性研究)[J]. Chinese J Magn Reson(波谱学杂志), 2010, 27(4): 572-583.

[13] Li Xin(李新), Xiao Li-zhi(肖立志), Hu Hai-tao(胡海涛). Characteristics of NMR logging while drilling tools(随钻核磁共振测井仪探测特性研究)[J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(1): 84-92.

[1]	LIU Wen-qing, SONG Yan-hong, WANG Xue-lu, YAO Ye-feng. In Operando Nuclear Magnetic Resonance Spectroscopy Study on Photocatalytic Methanol Reforming [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 298-308.
[2]	YIN Tian-peng, WANG Ya-rong, WANG Min, SHI Wen-zhi, ZHANG Zheng-qian, HE Sha-sha. Complete Assignments of NMR Spectral Data of Three C₁₉-Diterpenoid Alkaloids [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 331-340.
[3]	YANG Yun-han, DU Yao, YING Fei-xiang, YANG Jun-li, XIA Da-zhen, XIA Fu-ting, YANG Li-juan. Inclusion Behavior of Naringenin/β-Cyclodextrin Supramolecular Complex [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 319-330.
[4]	HU Kun, SUN Han-dong, PUNO Pema-tenzin. Application of Quantum Chemical Calculation of Nuclear Magnetic Resonance Parameters in the Structure Elucidation of Natural Products [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 359-376.
[5]	WANG Ya-lan, WANG Xiao-jing, WANG Zhi-wei. Spectral Analyses and Structural Elucidation of Azilsartan [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 350-358.
[6]	LIU Ji-hong, JIN Kun, WANG Ping, LUO Gen. An NMR Study on Esculetin and It's Derivatives [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 341-349.
[7]	WAN Zhi-bin, SONG Jian-hui, GUO Ming-ming. The Application of in Operando Liquid State NMR on Macromolecular Material Characterization [J]. Chinese Journal of Magnetic Resonance, 2019, 36(3): 408-424.
[8]	TANG Ming-xue, SCHMIDT Claudia. Estimation of Nematic Order Parameters via Haller Analysis of ¹H NMR Spectra of Liquid Crystals [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 138-147.
[9]	CAO Yuan, WU Yong-ping, CHEN Dong-jun. A Spectroscopic Study on Tautomerism of Selaginellins from Selaginella [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 155-163.
[10]	TANG Heng, Gilbert NSHOGOZA, LIU Ming-qing, LIU Ya-qian, RUAN Ke, MA Rong-sheng, GAO Jia. Identification of Novel Hits of the NSD1 SET Domain by NMR Fragment-Based Screening [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 148-154.
[11]	XIAO Xiong-jie, HU Mary, ZHANG Xu, HU Jian-zhi. An NMR-Based Metabolomics Study of Kidneys from Mice Exposed to Ionizing Radiation [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 172-181.
[12]	XU Xiao-jun, WANG Shen-lin. Probing Membrane Protein Interactions by ¹⁹F Solid-State NMR [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 238-251.
[13]	KOU Xin-hui, LIU Yi-xiang, LIU Xing-hong, LI Cong-gang, LIU Mai-li, JIANG Ling. Visualizing the Pre-Active Conformation of Response Regulator PhoB_N^F20D in Its apo State [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 164-171.
[14]	CHEN Xiao-ying, YU Gang-jin, MAO Shi-zhen, LIU Mai-li, DU You-ru. Mixing-Induced Decreases in Critical Micelle Concentration in Aqueous Solution of Surfactants:Probing into the Mechanisms with ¹H NMR Spectroscopy [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 219-224.
[15]	WANG Shuang-hong, ZENG Pei, PAN Si-na, WANG Jia, WANG Shu-mei, YANG Yong-xia. Effects of Gegen Qinlian Decoction on the Fecal Metabonome of High Fructose-Induced Insulin Resistance Rats Studied by ¹H NMR Spectroscopy [J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 182-194.