Characterization of corrosion scale formed on 3Cr steel in CO 2 -saturated formation water

The paper presents the experimental research of distribution of nine С1–С5 aliphatic monoatomic alcohols of normal and isomeric structure in a two-phased heterogenous system ”formation water–n-dodecane” using gas-chromatography method for the purpose of a choice of the most eﬀective tracers for the characterization of ﬁltrational streams and oil saturation when waterﬂooding. There were deﬁned distribution constants K_с in interval of temperatures 25–75С on which basis appeared the conclusion that alcohols С1–С3 can be used as water (non-partitioning) tracers whereas alcohols С4–С5 approach for a role of partitioning tracers.

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Active seismic monitoring of CO2-saturated brine injection into a fault (CS-D experiment in the Mont Terri Rock Laboratory)

10.5194/egusphere-egu2020-21588 ◽

2020 ◽

Author(s):

Melchior Grab ◽

Alba Zappone ◽

Antonio P. Rinaldi ◽

Sebastian Hellmann ◽

Quinn Wenning ◽

...

Keyword(s):

Saturated Formation ◽

Second Phase ◽

Formation Water ◽

Rock Laboratory ◽

Imaging Results ◽

Geophysical Surveys ◽

Abstract Submission ◽

Mont Terri ◽

Mont Terri Rock Laboratory

Confirming the permanent containment is a key challenge for the storage of CO2 in deep underground reservoirs. Faults in the cap rock of such reservoirs are potential flow paths for the CO2 to escape. Our decametre-scale experiment at the Mont Terri Rock Laboratory aims to better understand mechanisms of CO2 leakage trough a fault, and to test strategies to monitor the propagation of CO2-saturated water through faults.Two boreholes were drilled through the main fault in Mont Terri with packer-intervals dedicated to fluid-injection and hydraulic/geochemical monitoring. Another five boreholes in the close surrounding were equipped with various instruments for geotechnical and geophysical observations. During the first phase of the experiment, the hydraulic response of the fault was characterized with injections of formation water in a step-up mode at pressures up to 6.0&#160;MPa. The second phase, which was still on-going at the time of the abstract submission, consists of a long-term (several months) injection of CO2-saturated formation water at a constant head of 4.5&#160;MPa, which is below the fault opening pressure. All injection activities were monitored with active seismic measurements, along with a comprehensive set of hydraulic-, mechanical-, geochemical- and other geophysical surveys. We will present the active seismic imaging results from the step-up injection test and compare them with the other surveys. Additionally, preliminary results will be shown acquired during the long-term injection of CO2-saturated formation water into the fault.

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PHYSICOCHEMICAL AND ISOTOPIC CHARACTERIZATION OF FORMATION WATERS FROM OIL FIELDS IN THE SERGIPE BASIN, BRAZIL

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v32i3.507 ◽

2014 ◽

Vol 32 (3) ◽

pp. 531

Author(s):

Danilo R. Sá Teles ◽

Antônio Expedito G. de Azevedo ◽

Alexandre B. Costa ◽

Maria R. Zucchi ◽

Alexandre A. Ferreira

Keyword(s):

Stable Isotopes ◽

Isotopic Exchange ◽

Inorganic Carbon ◽

Dissolved Inorganic Carbon ◽

Oil Fields ◽

Northeastern Brazil ◽

Formation Water ◽

Water Formation ◽

Isotopic Characterization

ABSTRACT. This paper presents a study of the physicochemical and isotopic characteristics of formation waters from the Castanhal, Siririzinho and Aguilhadafields in the Sergipe Basin, northeastern Brazil. In each of the samples, pH, conductivity, concentration of dissolved inorganic carbon (DIC), δ18O, δ2H, and δ13C weremeasured. These measurements are used to identify isotopic similarities among waters from local aquifers, which can be used as a proxy for groundwater connectivitywith formation water. Formation waters from the Castanhal and Siririzinho fields are enriched in deuterium, as evidenced by their δ2H values above the Global MeteoricWater Line (GMWL), which may be a result of significant isotopic exchange between water and H2S. These measurements are in accordance with the large enrichment in13C of DIC resulting from biodegradation, with the formation of methane depleted in 13C and CO2 enriched in 13C. These results indicate interaction between formationwater with rocks and other fluids.Keywords: stable isotopes, dissolved inorganic carbon, biodegradation. RESUMO. Este trabalho apresenta um estudo das características físico-químicas e isotópicas de águas de formação dos campos Castanhal, Siririzinho e Aguilhada, localizados na Bacia de Sergipe, nordeste do Brasil. Em cada uma das amostras foram medidos os parâmetros pH, condutividade elétrica, concentração de carbonoinorgânico dissolvido (CID), δ18O, δ2H e δ13C. A partir dos resultados obtidos, foi possível identificar a similaridade isotópica com as águas de aquíferos locais,indicando conexão de água subterrânea com água de formação. As águas de formação dos campos Castanhal e Siririzinho apresentaram um enriquecimento em deutério,resultado da troca isotópica entre a água e o H2S. Também foi verificado, um grande enriquecimento no δ13C do CID, resultado dos processos de biodegradação coma formação de metano empobrecido em 13C e CO2 enriquecido neste isótopo. Os resultados encontrados indicam interação entre a água de formação com as rochas ecom outros fluidos.Palavras-chave: isótopos estáveis, carbono inorgânico dissolvido, biodegradação.

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Finite groups with given sets of 𝔉-subnormal subgroups

Asian-European Journal of Mathematics ◽

10.1142/s1793557120500734 ◽

2019 ◽

Vol 13 (04) ◽

pp. 2050073 ◽

Cited By ~ 1

Author(s):

Viachaslau I. Murashka

Keyword(s):

Finite Groups ◽

Saturated Formation ◽

Supersoluble Groups ◽

Sylow Subgroups ◽

Hereditary Saturated Formation ◽

Subnormal Subgroups

In this paper, the classes of groups with given systems of [Formula: see text]-subnormal subgroups are studied. In particular, it is showed that if [Formula: see text] and [Formula: see text] are a saturated homomorph and a hereditary saturated formation, respectively, then the class of groups whose [Formula: see text]-subgroups are all [Formula: see text]-subnormal is a hereditary saturated formation. As corollaries, some known results about supersoluble groups, classes of groups with [Formula: see text]-subnormal cyclic primary and Sylow subgroups are obtained. Also the new characterization of the class of groups whose extreme subgroups all belong [Formula: see text], where [Formula: see text] is a hereditary saturated formation, is obtained.

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