Artículos de publicaciones periódicas

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Cellulose nanoﬁbrils as a replacement for xanthan gum (XGD) in water based muds (WBMs) to be used in shale formations
(2018-12) Villada, Yurany; Iglesias, María Celeste; Casis, Natalia; Erdmann, Eleonora; Peresin, María Soledad; Estenoz, Diana
"In this work, the potential replacement of xanthan gum (XGD) by cellulose nanofibrils in the composition of water based muds (WBMs) was studied. Bleached (B-CNF) and unbleached (L-CNF) cellulose nanofibrils, mainly differentiated by their lignin content, were tested and their performances were compared with that of XGD. The effects of cellulose nanofibrils on the rheological and filtration properties of WBMs were investigated. Rheometric analysis showed a shear-thinning behavior more noticeable for fluids containing B-CNF and XGD, while filtration properties were improved using L-CNF. The Sisko model was used to determine rheological parameters. Finally, it was found that by replacing XGD by double concentration of L-CNF in a WBM for Argentina shale, similar rheological properties were obtained. Structural changes were assessed by using Scanning Electron Microscopy (SEM). Particles agglomeration and good film formability were observed. Furthermore, WBMs with lignin-containing cellulose nanofibrils exhibited a better thermal stability after aging."
Evaluación reológica de fluidos de perforación base agua con nanosílice
(2018-07) Gallardo, Felipe Eusebio; Erdmann, Eleonora; Abalos, Roxana
"La creciente demanda hidrocarburífera ha llevado al estudio y producción de reservorios no convencionales de tipo shale en Argentina y el mundo. Este tipo de formaciones sedimentarias de estructura laminar, están conformadas por partículas consolidadas del tamaño de las arcillas, poseen nanoporos y baja permeabilidad. Durante la perforación del shale con WBM se debe garantizar la estabilidad de las paredes del pozo controlando la inhibición de las arcillas presentes y el incremento de la presión poral ocasionado por el ingreso de fluido a la formación. Para este último propósito, en este trabajo, se seleccionó nanosílice de 12 nm, la cual obtura los poros del shale que tienen un tamaño promedio de 30 nm. Se busca de esta forma reducir el ingreso de fluido a la formación, la presión poral, la permeabilidad y minimizar la interacción roca-fluido."
Evaluation of silicone fluids and resins as CO2 thickeners for enhanced oil recovery using a computational and experimental approach
(2021-09) Gallo Jiménez, Gonzalo Augusto; Erdmann, Eleonora; Cavasotto, Claudio N.
"CO2 thickeners have the potential to be a game changer for enhanced oil recovery, carbon capture utilization and storage, and hydraulic fracturing. Thickener design is challenging due to polymers’ low solubility in supercritical CO2(scCO2) and the difficulty of substantially increasing the viscosity of CO2. In this contribution, we present a framework to design CO2 soluble thickeners, combining calculations using a quantum mechanical solvation model with direct laboratory viscosity testing. The conductor-like polarizable continuum model for solvation free-energy calculations was used to determine functional silicone and silsesquioxane solubilities in scCO2. This method allowed for a fast and efficient identification of CO2-soluble compounds, revealing silsesquioxanes as more CO2-philic than linear polydimethylsiloxane (PDMS), the most efficient non-fluorinated thickener know to date. The rolling ball apparatus was used to measure the viscosity of scCO2 with both PDMS and silicone resins with added silica nanoparticles. Methyl silicone resins were found to be stable and fast to disperse in scCO2 while having a significant thickening effect. They have a larger effect on the solution viscosity than higher-molecular-weight PDMS and are able to thicken CO2 even at high temperatures. Silicone resins are thus shown to be promising scCO2 thickeners, exhibiting enhanced solubility and good rheological properties, while also having a moderate cost and being easily commercially attainable."
Functional characterization on colloidal suspensions containing xanthan gum (XGD) and polyanionic cellulose (PAC) used in drilling fluids for a shale formation
(2016) Villada, Yurany; Gallardo, Felipe Eusebio; Erdmann, Eleonora; Casis, Natalia; Olivares, Laura; Estenoz, Diana
"Drilling fluids are employed in the operation of hydrocarbon exploitation. Two kinds of drilling fluids are commonly used: water based muds and oil based muds. The oil based muds are characterized by their high performance in unconventional reservoirs due to the very low interaction with the reactive formation. Their environmental impact promotes the design of water based muds that present low toxicity. In this paper a water based mud for shale formation with similar rheological characteristics to the oil based mud used in the oil industry of Argentina was designed and the effect of xanthan gum and polyanionic cellulose on the main functional characteristics was studied. Rheometric analysis showed a shear-thinning behavior with notable effect on the concentration of polymers. After dynamic aging test, fluids with composition of PAC=8.00 g/L and XGD =3.00 g/L exhibited rheological properties very close to oil base mud. Structural changes were assessed from optical microscopy and scanning electron microscopy. Particles agglomeration due to the presence of polymers was observed. Furthermore, mud filtration essays allowed to evaluate the performance of PAC as control agent. The Carreau model and statistical analysis were used to determine rheological parameters."
Multi-objective optimization of a CO2-EOR process from the sustainability criteria
(2018-01) Gutiérrez, Juan Pablo; Erdmann, Eleonora; Manca, Davide
"Aim of this article is to estimate and discuss the economic and environmental impacts for the obtainment of CO2 in such conditions to be injected as enhanced oil recovery (EOR) fluid. Particularly, this study focuses on the compression sector design needed to process the CO2 coming from an already existing absorption plant. Currently, 18.68 kmol/h of a high-purity CO2 stream may be used for injecting and increasing the production of a pilot crude oil well near the location of the industrial plant. However, it is still necessary to perform an economic evaluation to quantify the investment and the operating costs that the compression involves..."
Steady-state energy optimization and transition assessment in a process of CO2 absorption from natural gas
(2018-09) Gutiérrez, Juan Pablo; Tarifa, Enrique E.; Erdmann, Eleonora
"An industrial-scale MDEA-based CO2 absorption process is considered in this work. Natural gas plant of Aguaragüe Argentina is selected to perform the studies of optimization and dynamics. With the steadystate of the process simulated, the reboiler energy demand of the plant is optimized in Aspen Hysys v8.8. In this optimization study, we analyze the base case (current) conditions of the reference plant and also six disturbance scenarios. According to the results, the main energy requirement can be reduced in more than a 48%, with the current process design. In the second part of our work, the plant is simulated in dynamic mode with the aim of characterizing the transition towards the found optimal conditions. It is proved that the dynamic model can reproduce the specified values after a short-time. In addition, the absence of undesirable states during the stabilization proves that the current control scheme is appropriate to minimize the energy consume in the plant under study."

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