Droplet Size Distribution in Water-Crude Oil Emulsions by Low-Field NMR

被引：18

作者：

Morgan, Vinicius G. ^{[1
]}

Sad, Cristina M. S. ^{[1
]}

Constantino, Andre E. ^{[1
]}

Azeredo, Rodrigo B., V ^{[2
]}

Lacerda Jr, Valdemar ^{[1
]}

Castro, Eustaquio V. R. ^{[1
]}

Barbosa, Lucio L. ^{[3
]}

机构：

[1] Univ Fed Espirito Santo, Lab Pesquisa & Desenvolvimento Metodol Anal Petro, BR-29075910 Vitoria, ES, Brazil

[2] Univ Fed Fluminense, Inst Quim, BR-24020290 Niteroi, RJ, Brazil

[3] Univ Fed Sao Paulo Unifesp, Dept Engn Petroleo, BR-11030400 Santos, SP, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2019年 / 30卷 / 08期

基金：

巴西圣保罗研究基金会;

关键词：

crude oil emulsions; drop size distribution; low field NMR; MAGNETIC-RESONANCE; DIFFUSION; STABILITY; ASPHALTENE; VISCOSITY; GRADIENT; ECHO;

D O I：

10.21577/0103-5053.20190057

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This paper reports the droplet size distribution (DSD) measurements in 28 W/O (water/oil) crude oil emulsions prepared with two Brazilian oils (medium and heavy) under different shear conditions using both 10 g L-1 NaCl solution and water production by low field nuclear magnetic resonance (NMR, 2.2 MHz). The PFGSTE (pulsed-field gradient-stimulated echo) pulse sequence applied was able to separate the crude oil emulsion signal for both medium and heavy oil even for low dispersed phase content (1.51 wt.%) and took into account only the aqueous phase signal. All emulsions exhibited an average diameter smaller than 5.5 mu m because of the severe shear conditions. Despite the difficult processing of the S24 (6.48 wt.%) emulsion signal, good agreement was achieved between low field NMR and low-angle laser light scattering (LALLS) results. Finally, the paramagnetic ions in the water production did not affect the NMR measurements, demonstrating its applicability for analyzing real emulsions.

引用

页码：1587 / 1598

页数：12

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