分析测试学报2016，Vol.35Issue(11)：1445-1450,6.DOI:10.3969/j.issn.1004-4957.2016.11.013
低场核磁共振法对油基钻井液乳状液乳滴稳定性的研究
Investigation on Stability of Emulsion Droplet in Oil-based Drilling Fluid by Low Field Nuclear Magnetic Resonance
张瑞 1霍锦华 1彭志刚 1冯茜 1王吉星 1毛旭1
作者信息
- 1. 西南石油大学 化学化工学院,四川 成都 610500
- 折叠
摘要
Abstract
The stability of water-in-oil emulsion in oil-based drilling fluid was investigated by low field NMR(low field nuclear magnetic resonance).Firstly,the transverse relaxation time T2 of white oil and pure water were obtained by the CMPG pulse sequence,then,a further qualitative analysis on the T2 distribution curve of water in oil emulsion was conducted by introducing the relaxation reagent MnCl2?4H2O,the relaxation peak located between 10 ms and 1 000 ms corresponded to the overlapping peaks of moderate movable free water and white oil,which was defined as emulsion relaxation peak.The relaxation peak located between 1 000 ms and 10 000 ms corresponded to that of the high degree movable free water.Thus,in this paper,the relaxation peak area ratio and relaxation peak spacing were selected as quantitative indicators to investigate the influences of relaxation reagent,oil to water ratio and aging time on the transverse relaxation time T2 distribution curve of emulsion.In addition,low field NMR was also used to test the relative oil content in oil-based drilling fluids emulsion.Experimental results showed that the low field NMR is an efficient,fast and accurate analysis technique to reflect the stability of oil-based drilling fluids emulsion,and it also could be used to test the relative oil content in oil-based drilling fluids emulsion or crude oil efficiently and accurately.关键词
油基钻井液/乳状液乳滴/低场核磁共振/横向弛豫时间Key words
oil-based drilling fluids/emulsion droplet/low field NMR/transverse relaxation time分类
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张瑞,霍锦华,彭志刚,冯茜,王吉星,毛旭..低场核磁共振法对油基钻井液乳状液乳滴稳定性的研究[J].分析测试学报,2016,35(11):1445-1450,6.
