Low-field permanent magnets for industrial process and quality control

J Mitchell, LF Gladden, TC Chandrasekera… - Progress in nuclear …, 2014 - Elsevier
In this review we focus on the technology associated with low-field NMR. We present the
current state-of-the-art in low-field NMR hardware and experiments, considering general …

[HTML][HTML] Study of the stability and homogeneity of water in oil emulsions of heavy oil

M da Silva, CMS Sad, LB Pereira, RRB Corona… - Fuel, 2018 - Elsevier
Abstract Water-in-oil (W/O) emulsions are present in applications from well drilling to refining
and cause diverse problems. The present paper details the results of a study of the stability …

[HTML][HTML] Innovations in Crude-Oil Characterization: A Comprehensive Review of LF-NMR Applications

I Khelil, AA Al-Muntaser, MA Varfolomeev, MH Hakimi… - Energies, 2024 - mdpi.com
The advent of low-field nuclear magnetic resonance (LF-NMR) has revolutionized the
petroleum industry by providing a swift and straightforward method for the spectroscopic …

Application of low-field NMR for the determination of physical properties of petroleum fractions

LL Barbosa, FVC Kock, RC Silva, JCC Freitas… - Energy & …, 2013 - ACS Publications
We propose the use of the low-field 1H NMR technique to predict various properties of
petroleum fractions with° API ranging from 21.7 to 32.7. The experimental data obtained by …

Characterisation and selection of demulsifiers for water-in-crude oil emulsions using low-field 1H NMR and ESI–FT-ICR MS

GF Carneiro, RC Silva, LL Barbosa, JCC Freitas… - Fuel, 2015 - Elsevier
Water-in-oil emulsions constitute a widespread issue for the oilfield industry. Indeed, the
phases of water-in-oil emulsions must be separated as soon as possible in the production …

Application of low field NMR as an alternative technique to quantification of total acid number and sulphur content in petroleum from Brazilian reservoirs

LL Barbosa, CMS Sad, VG Morgan, PR Figueiras… - Fuel, 2016 - Elsevier
Crude oils produced from different reservoirs in the world have very different chemical
compositions and physicochemical properties. Naphthenic acids and sulphur content can …

Characterisation of oil sludges from different sources before treatment: high-field nuclear magnetic resonance (NMR) in the determination of oil and water content

D Ramirez, RM Kowalczyk, CD Collins - Journal of Petroleum Science and …, 2019 - Elsevier
Oil sludges are wastes from the oil industry containing complex mixtures of oil hydrocarbons,
water, sediments, and heavy metals. These wastes are of main importance for the petroleum …

Evaluation of the physicochemical properties of the postsalt crude oil for low-field NMR

VG Morgan, LL Barbosa, V Lacerda Jr… - Industrial & …, 2014 - ACS Publications
Low-field (LF) nuclear magnetic resonance (NMR) is a very versatile technique that has
increasingly shown its value, especially in research involving crude oil. In the field of …

Quantitative component analysis of solid mixtures by analyzing time domain 1H and 19F T1 saturation recovery curves (qSRC)

D Stueber, S Jehle - Journal of Pharmaceutical Sciences, 2017 - Elsevier
Prevalent polymorphism and complicated phase behavior of active pharmaceutical
ingredients (APIs) often result in remarkable differences in the respective biochemical and …

NMR in the time domain: A new methodology to detect adulteration of diesel oil with kerosene

DA Cunha, LF Montes, EVR Castro, LL Barbosa - Fuel, 2016 - Elsevier
Petroleum products such as LPG (cooking gas), kerosene, gasoline, diesel oil, among
others, are obtained from the refining of crude oil. Among these, the diesel has great …