原油乳化液低场核磁共振测量参数优化与T_2谱特征分析
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摘要
为优化低场核磁共振CPMG自旋回波法检测原油乳化液的测量参数,用原油和蒸馏水配制了含水20.0%的原油乳化液,依次改变各影响参数,测量了相应的T2谱。通过分析T2谱各峰的横向弛豫时间和峰面积随各参数的变化,总结出不同含水原油乳化液的最佳核磁共振测量参数为:重复采样次数取100,重复采样等待时间取8 s,半回波时间取300μs,原油乳化液含水体积分数为C时,回波个数Echo Cnt=11 000+10 000C。在最佳参数下测量了含水20.0%、30.0%、40.0%和50.0%油包水型原油乳化液T2谱,分析了T2谱的基本特征和3个峰的形成机理。
A variety of T2 spectra of crude oil-water emulsions with water content 20% prepared in the laboratory are tested in order to optimize the parameters for measuring crude oil-water emulsion by method of the Carr-PurcellMeiboom-Gill( CPMG) spin echo using low field nuclear magnetic resonance( NMR),and the changes of transverse relaxation time and peak area of these T2 spectra are analyzed with various parameters. The results show that optimal parameters for NMR measurement of crude oil-water emulsion with different water content are as follows: NS = 100,TR= 8 000 ms,τ = 300 μs,Echo Cnt = 11 000 + 10 000 C. NMR T2 spectras of W/O emulsions with water content of20%,30%,40% and 50% are respectively measured under the optimal parameters,then characteristics and formation mechanism of the T2 spectras are explained. This study lays foundation for determination of crude oil-water emulsions by low field NMR.
A variety of T2 spectra of crude oil-water emulsions with water content 20% prepared in the laboratory are tested in order to optimize the parameters for measuring crude oil-water emulsion by method of the Carr-PurcellMeiboom-Gill( CPMG) spin echo using low field nuclear magnetic resonance( NMR),and the changes of transverse relaxation time and peak area of these T2 spectra are analyzed with various parameters. The results show that optimal parameters for NMR measurement of crude oil-water emulsion with different water content are as follows: NS = 100,TR= 8 000 ms,τ = 300 μs,Echo Cnt = 11 000 + 10 000 C. NMR T2 spectras of W/O emulsions with water content of20%,30%,40% and 50% are respectively measured under the optimal parameters,then characteristics and formation mechanism of the T2 spectras are explained. This study lays foundation for determination of crude oil-water emulsions by low field NMR.
引文
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[12]杨大鹏,杨小鹏,王殿生.超声波制备低含油稳定原油乳化液的正交实验[J].实验室研究与探索,2014,33(5):33-36.
[13]於日义.含水率与原油乳状液稳定性关系研究[J].化工设计通讯,2016,42(5):150.
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[2]白怀勇,周格,王殿生.不同浓度乙醇-水溶液核磁共振实验研究[J].实验技术与管理,2013,30(8):39-42.
[3]陈森,孟兆磊,陈闰堃,等.樱桃水分变化的低场核磁共振[J].实验室研究与探索,2013,32(8):52-54.
[4]Yang Zheng,Hirasaki George J.NMR measurement of bitumen at different temperatures[J].Journal of Magnetic Resonance,2008,192(2):280-293.
[5]Mutina A R,Hürlimann M D.Effect of oxygen on the NMR relaxation properties of crude oils[J].Applied Magnetic Resonance,2005,29:503-513.
[6]郑晓园.基于低场核磁共振弛豫特性含油污泥水和油分析方法研究[D].杭州:浙江大学,2014.
[7]王志永,王欣,夏义苗,等.生鲜猪肉低场核磁检测参数优化[J].食品科学,2015,36(12):177-184.
[8]史然,王欣,刘宝林,等.油脂低场核磁(LF-NMR)检测参数的优化试验[J].分析测试学报,2012,31(11):1365-1372.
[9]王殿生,周丽霞,刘超卓,等.物理实验教程——近代物理实验[M].东营:中国石油大学出版社,2016.
[10]Monakhova Y B,Mushtakova S P.Investigation into the structural composition of hydroalcoholic solutions as basis for the development of multiple suppression pulse sequences for NMR measurement of alcoholic beverages[J].Magnetic Resonance in Chemistry,2014,52(12):755-759.
[11]Zhang R,Huo J H.Research on oil-based drilling fluids emulsion droplet by low-field NMR[J].Applied Magnetic Resonance,2016,47:1339-1352.
[12]杨大鹏,杨小鹏,王殿生.超声波制备低含油稳定原油乳化液的正交实验[J].实验室研究与探索,2014,33(5):33-36.
[13]於日义.含水率与原油乳状液稳定性关系研究[J].化工设计通讯,2016,42(5):150.
[14]操泽,冯成,何思宏,等.油包水乳状液微观特性进展研究[J].当代化工,2015,44(3):540-542.
[15]赵婷婷.低场核磁共振技术(LF-NMR)在动物油脂品质检测中的应用[D].上海:上海理工大学,2014.
[16]Saidian Milad.Water/Oil/Gas Emulsions/Foams Characterization Using Low Field Nuclear Magnetic Resonance[P].America:US2016320323.2016-11-03.
[17]Leon C,Martijn Ketelaars.Nuclear magnetic resonance study of the conformation and dynamics ofβ-casein at the oil/water interface in emulsions[J].Biophysical Journal,1996,70:2396-2402.