Journal Highlight: Molecular dynamics and composition of crude oil by low-field nuclear magnetic resonance

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  • Published: Sep 5, 2016
  • Author: spectroscopyNOW
  • Channels: NMR Knowledge Base
thumbnail image: Journal Highlight: Molecular dynamics and composition of crude oil by low-field nuclear magnetic resonance
Low-field NMR relaxation measurements have been used to reveal the composition of crude oil, offering a low-cost method that can be used under poor working conditions in the field and in the wellbore.

Molecular dynamics and composition of crude oil by low-field nuclear magnetic resonance

Magnetic Resonance in Chemistry, 2016, 54, 650-655
Zijian Jia, Lizhi Xiao, Zhizhan Wang, Guangzhi Liao, Yan Zhang and Can Liang

Abstract: Nuclear magnetic resonance (NMR) techniques are widely used to identify pure substances and probe protein dynamics. Oil is a complex mixture composed of hydrocarbons, which have a wide range of molecular size distribution. Previous work show that empirical correlations of relaxation times and diffusion coefficients were found for simple alkane mixtures, and also the shape of the relaxation and diffusion distribution functions are related to the composition of the fluids. The 2D NMR is a promising qualitative evaluation method for oil composition. But uncertainty in the interpretation of crude oil indicated further study was required. In this research, the effect of each composition on relaxation distribution functions is analyzed in detail. We also suggest a new method for prediction of the rotational correlation time distribution of crude oil molecules using low field NMR (LF-NMR) relaxation time distributions. A set of down-hole NMR fluid analysis system is independently designed and developed for fluid measurement. We illustrate this with relaxation–relaxation correlation experiments and rotational correlation time distributions on a series of hydrocarbon mixtures that employ our laboratory-designed downhole NMR fluid analyzer. The LF-NMR is a useful tool for detecting oil composition and monitoring oil property changes.

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