Aplicação de RMN de baixo campo para estimar características físicas e químicas de água de produção da indústria de petróleo
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Data
2016-08-29
Autores
Machado, Maiara Pereira
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Universidade Federal do Espírito Santo
Resumo
The composition of the produced water is varied and depend on the characteristics and depth of the oil production field. Among the constituents are some paramagnetic ions such as Co, Cr, Cu, Fe in small concentrations. Paramagnetic ions interact strongly with the solvent, causing appreciable reduction in the transverse relaxation time (T2).In this work applied to nuclear magnetic resonance (NMR) in the time domain with the aid of inductively coupled plasma optical emission spectrometry (ICP OES) to estimate the concentration of paramagnetic ions Co2+, Cr3+, Cu2+, Fe3+, Mn2+and Ni2+in aqueous solution and water in oil produced.The results for the aqueous medium showed that the low field enables a good correlation with ICP OES, giving a linear correlation between the transverse relaxation rate (T2-1) and the emission intensity for the range of concentration from 0.5 to 10 mg.L-1,concluding that the transverse relaxation rate can be used as a "probe" optical emission, which has advantages such as reduced costs, faster analyzes and not destructiveness of the sample.Since the produced water analysis led to reduction in T2values from 1.09 to 0.14s. They determined the concentrations of ions by ICP OES and noted the existence of a correlation with the concentration and T2, however it was not possible to estimate the concentration of these ions in the water.From T2study of produced water was correlated with some chemical-physical characteristics as salinity, conductivity, and pH. reasonable correlations were obtained from T2to the salinity and the natural logarithm of T2 with pH.
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Low field NMR , Paramagnetic ions , Water produced oil , RMN baixo campo , ICP OES , Íons paramagnéticos , Águas produzida , Espectrometria de emissão óptica por plasma acoplado indutivamente
Citação
MACHADO, Maiara Pereira. Aplicação de RMN de baixo campo para estimar características físicas e químicas de água de produção da indústria de petróleo. 2016. 75 f. Dissertação (Mestrado em Química) – Universidade Federal do Espírito Santo, Centro de Ciências Exatas, Vitória, 2016.