Engenharia Mecânica

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http://repositorio.ufes.br/handle/10/17620
Programa de Pós-Graduação em Engenharia Mecânica

Centro: CT
Telefone: (27) 4009 2116
URL do programa: http://www.engenhariamecanica.ufes.br/pos-graduacao/PPGEM

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Navegando Engenharia Mecânica por Autor "Aldeia, Wagner"

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    A fase oleosa e a degaseificação do CO2 na precipitação de CaCO3: implicações, modelagem, simulação numérica, validação e desenvolvimento de protótipo experimental
    (Universidade Federal do Espírito Santo, 2022-11-21) Cosmo, Rafael de Paula; Soares, Edson José; http://lattes.cnpq.br/4485206584533650; https://orcid.org/0000-0002-4243-7871; http://lattes.cnpq.br/6932882950751155; Pereira, Fabio de Assis Ressel; https://orcid.org/0000-0002-1500-2952; http://lattes.cnpq.br/5476118728173549; Siqueira, Renato do Nascimento; https://orcid.org/0000-0002-8397-8180; http://lattes.cnpq.br/9791817633014124; Aldeia, Wagner; https://orcid.org/0000-0002-9914-819X; http://lattes.cnpq.br/5721602276797687; Fontes, Rosane Alves; Dariva, Claudio; Junqueira, Silvio Luiz de Mello; Martins, Andre Leibsohn
    Precipitation and scaling are recurring problems in many water-handling processes. In oil production, particularly, such occurrences are critical due to the infeasibility or extreme difficulty of remedying precipitation or removing scale. This is due to adverse operating conditions: high pressures and temperatures; the action of corrosive gases such as CO2 and H2S; high salinity; and a confined system in a rocky medium. Pre-Salt carbonate reservoirs are notable for the high CO2 content in their fluids, with this acid gas being a variable affecting several stages of the exploitatory process. The relationship between CO2 and calcium carbonate (CaCO3) is evident in the reaction Ca2+(aq) + 2 HCO3 – (aq) ⇆ H2O + CaCO3(s) + CO2(aq). The pressure drop inherent to the production degass the CO2 (CO2(aq) → CO2(g)), which shifts the equilibrium to the right and implies the formation of CaCO3(s). An applied review of the role of CO2 in precipitation, considering the water, oil and gas phases, was carried out with field data from the Pre-Salt. Likewise for the aqueous, the oily CO2 degasses (CO2(o) → CO2(g)) and also implies more CaCO3, with the partitioning of the CO2 between phases governing the phenomenon. An experimental procedure developed to quantify the CaCO3 that precipitates directly due to pressure and temperature variation, and that which precipitates indirectly due to the escape of CO2, allows the estimation of the weight of the CO2 degassing in CaCO3 precipitation. This procedure was numerically simulated with MultiScale™ software for the H2O–CO2–CaCO3 system, indicating that CO2 escape contributes with 55% to 93% of precipitation. Five geothermal energy production assets (without oil) around the world reporting problems with carbonate precipitation have been investigated. As a result, the CO2 flash contributes with 66% to 93%. In simulations with real data from a Pre-Salt well (with oil), the contribution was 65% for the operating condition of the well with a BSW (basic sediments and water) of 35%. Simulations covering the BSW from 0% to 100% showed a “sui generis” behavior of the influence of CO2, coinciding with operational problems in many oil fields, and may help to explain their still unknown causes. An experimental prototype was designed and built to briefly perform this procedure. In addition, the unit will allow the research of several other phenomena related to flow assurance. In order to validate the equipment, some qualitative experiments were carried out, such as: scaling in gravel pack; formation of hydrates at 5 °C and 108 bar; precipitation of CaCO3 in the presence of CO2, CH4, salinity of 107,000 ppm, and Pre-Salt oil of 29 °API, at 95 °C and 104 bar, with the capture of “in situ” photomicrographs of crystals (calcite, aragonite, and vaterite); among others.