Heavy metals contribution of non-aqueous fluids used in offshore oil drilling

Pozebon, Dirce; Lima, Éder C.; Maia, Sandra Maria Alves Sayão; Fachel, Jandyra Maria Guimarães

doi:10.1016/j.fuel.2004.08.002

Cited by 44 publications

(18 citation statements)

References 6 publications

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“…This study is also important when one considers the possibility of the intensification of the fossil fuel exploitation activities of PETROBRAS (the Brazilian national oil company) on the Ceará -Rio Grande do Norte continental platform, which could further impact the environment just as has been reported for the Brazilian Campos platform and other oil producing hot spots of the world (STEINHAUER et al, 1994;REZENDE et al, 2002;POZEBON et al, 2005;MARINS, 2006).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

2010

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A B S T R A C TThe marine sediment samples collected from the northeastern Brazilian continental shelf, at water depths between 20 and 80 m, consisted mainly of sands with an almost total absence of gravel and granules. Medium, coarse and very coarse sand grains are mostly composed of halimeda, lithothamnium, rodoliths and bioclastic sands with a carbonate content varying between 77 and 96 %. The chemistry in general shows a decreasing content of Ca (86.1 %) >Si (6 %) > Cl (3.6 %) > Sr (0.8 %) > K (0.66 %) > S (0.62 %) > Al (0.6 %) > Na (0.55%) > Mg (0.43 %) > Fe (0.4 %) > P (0.2 %) > Br (0.04 %) in the samples. There was no correlation between CaCO3 and chemical contents and grain size with depth and biocomponents. With the exception of Sr of marine origin, all other elements (P, S, Br, Cl, Fe) are of continental origin. The lithothamnium of some offshore samples shows higher CaCO3 content, while Mg and Na are present only in halimedas. Bioclastic sands contain no Br, and silt and clay fractions are rare and characterize samples closer to the coast. These marine bioclastic granulates are of very pure biogenic calcium carbonates and are thus highly to be recommended for economic purposes. R E S U M OOs granulados marinhos, da Plataforma Continental do nordeste brasileiro, coletados de profundidades entre 20 e 80 m, são predominantemente areias cascalhosas constituídas de halimedas, litotames, rodolitos e areias bioclásticas, cujos teores de carbonatos variam de 77 a 96 %. A concentração média geral de elementos químicos na ordem decrescente é Ca (86.1 %) > Si (6 %) > Cl (3.6 %) > Sr (0.8 %) > K (0.66 %) > S (0.62 %) > Al (0.6 %) > Na (0.55 %) > Mg (0.43 %) > Fe (0.4 %) > P (0.2 %) > Br (0,04 %), independentemente da profundidade e tipo de bio-componente. Com exceção do Sr, que é de origem marinha, os demais elementos (P, S, Br, Cl, Fe) são de origem continental. Elementos como Mg e Na foram restritos às halimedas em apenas duas amostras, enquanto Br não foi detectado nas areias bioclásticas. Os maiores percentuais de frações finas (silte e argila) foram encontrados em amostras mais próximas à costa. Altas concentrações de carbonato de cálcio biogênico caracterizam esse depósito que pode ser considerado como recurso mineral marinho de importante valor econômico.

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Section: Introductionmentioning

confidence: 99%

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

2010

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“…All chemicals, instrumentation, and materials used are described elsewhere (Collasiol et al 2004;Pozebon et al 2005). The accuracy and precision of the employed methods were checked through the analysis of certified marine sediment sample (PACS-2) from NRCC.…”

Section: Metal and Arsenic Determinationmentioning

confidence: 99%

Metal and hydrocarbon behavior in sediments from Brazilian shallow waters drilling activities using nonaqueous drilling fluids (NAFs)

Peralba

Pozebon

Santos

et al. 2010

Environ Monit Assess

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The impact of drilling oil activities in the Brazilian Bonito Field/Campos Basin (Rio de Janeiro) shell drilling (300 m) using nonaqueous fluids (NAFs) was investigated with respect to Al, Fe, Mn, Ba, Co, Pb, Cu, As, Hg, Cr, Ni, Zn, Cd, V, and aliphatic and polynuclear aromatic hydrocarbons concentrations in the sediment. Sampling took place in three different times during approximately 33 months. For the metals Al, As, Co, Cr, Cu, Cd, Fe, Ni, Mn, V, and Zn, no significant variation was observed after drilling activities in most of the stations. However, an increase was found in Ba concentration--due to the drilling activity--without return to the levels found 22 months after drilling. High Ba contents was already detected prior to well drilling, probably due to drilling activities in other wells nearby. Hydrocarbon contents also suggest previous anthropogenic activities. Aliphatic hydrocarbon contents were in the range usually reported in other drilling sites. The same behavior was observed in the case of polyaromatic hydrocarbons. Nevertheless, the n-alkane concentration increased sharply after drilling, returning almost to predrilling levels 22 months after drilling activities.

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“…2 O bário contido na baritina é relativamente imóvel e pouco biodisponível, devido à baixa solubilidade em água (2,47 mg L -1 a 25 ºC), entretanto, na forma Ba +2 é tóxico. 3 Durante a perfuração de poços para a prospecção e produção de petróleo, o fluido é misturado à rocha moída, liberando substâncias que estavam em sua composição 4 e, consequentemente, tornando-se uma das principais influências nos teores de bário e outras substâncias nos resíduos de poços de perfuração de petróleo. 5 Particularmente, quando os solos são alagados, o metabolismo microbiano e o equilíbrio dos elementos e compostos são alterados, desencadeando uma série de transformações, principalmente, quí-micas e microbiológicas que levam a um novo estado de equilíbrio desse ambiente, com características bem distintas das encontradas inicialmente.…”

Section: Introductionunclassified

“…4 Este trabalho teve como objetivo avaliar, através de ensaios com colunas de lixiviação de solo, a mobilidade do bário em solo sob condição de redução.…”

Section: Introductionunclassified

Mobilidade de bário em solo tratado com sulfato de bário sob condição de oxidação e redução

Magalhães¹,

Sobrinho²,

Zonta³

et al. 2011

Quím. Nova

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Heavy metals contribution of non-aqueous fluids used in offshore oil drilling

Cited by 44 publications

References 6 publications

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

Geochemistry of marine sediments of the Brazilian Northeastern continental shelf

Metal and hydrocarbon behavior in sediments from Brazilian shallow waters drilling activities using nonaqueous drilling fluids (NAFs)

Mobilidade de bário em solo tratado com sulfato de bário sob condição de oxidação e redução

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