Cesar Ovalles
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Reversible adsorption of carbon dioxide on amine surface-bonded silica gel
O Leal, C Bolívar, C Ovalles, JJ García, Y Espidel
Inorganica Chimica Acta 240 (1-2), 183-189, 1995
Heavy oil based mixtures of different origins and treatments studied by atomic force microscopy
B Schuler, S Fatayer, G Meyer, E Rogel, M Moir, Y Zhang, MR Harper, ...
Energy & Fuels 31 (7), 6856-6861, 2017
Opportunities of downhole dielectric heating in venezuela: three case studies involving medium, heavy and extra-heavy crude oil reservoirs
C Ovalles, A Fonseca, A Lara, V Alvarado, K Urrecheaga, A Ranson, ...
SPE International thermal operations and heavy oil symposium and …, 2002
Anionic Group 6B metal carbonyls as homogeneous catalysts for carbon dioxide/hydrogen activation. The production of alkyl formates
DJ Darensbourg, C Ovalles
Journal of the American Chemical Society 106 (13), 3750-3754, 1984
Asphaltene stability in crude oils and petroleum materials by solubility profile analysis
E Rogel, C Ovalles, M Moir
Energy & fuels 24 (8), 4369-4374, 2010
Use of CO2-Triggered Switchable Surfactants for the Stabilization of Oil-in-Water Emulsions
C Liang, JR Harjani, T Robert, E Rogel, D Kuehne, C Ovalles, V Sampath, ...
Energy & fuels 26 (1), 488-494, 2012
Use of a dispersed iron catalyst for upgrading extra-heavy crude oil using methane as source of hydrogen☆
C Ovalles, E Filgueiras, A Morales, CE Scott, F Gonzalez-Gimenez, ...
Fuel 82 (8), 887-892, 2003
Homogeneous catalysts for carbon dioxide/hydrogen activation. Alkyl formate production using anionic ruthenium carbonyl clusters as catalysts
DJ Darensbourg, C Ovalles, M Pala
Journal of the American Chemical Society 105 (18), 5937-5939, 1983
Process for the downhole upgrading of extra heavy crude oil
C Vallejos, T Vasquez, C Ovalles
US Patent 5,891,829, 1999
Anionic group 6 hydrides and carboxylates as homogeneous catalysts for reduction of aldehydes and ketones
PA Tooley, C Ovalles, SC Kao, DJ Darensbourg, MY Darensbourg
Journal of the American Chemical Society 108 (18), 5465-5470, 1986
The residual oil saturation determination for Steam Assisted Gravity Drainage (SAGD) and Solvent-SAGD
T Kar, C Ovalles, E Rogel, J Vien, B Hascakir
Fuel 172, 187-195, 2016
Downhole upgrading of extra-heavy crude oil using hydrogen donors and methane under steam injection conditions
C Ovalles, C Vallejos, T Vasquez, I Rojas, U Ehrman, JL Benitez, ...
Petroleum science and technology 21 (1-2), 255-274, 2003
Determination of asphaltenes in crude oil and petroleum products by the on column precipitation method
E Rogel, C Ovalles, ME Moir, JF Schabron
Energy & fuels 23 (9), 4515-4521, 2009
Asphaltene chemical characterization as a function of solubility: effects on stability and aggregation
E Rogel, C Ovalles, M Moir
Energy & fuels 26 (5), 2655-2662, 2012
Sediment formation in residue hydroconversion processes and its correlation to asphaltene behavior
E Rogel, C Ovalles, A Pradhan, P Leung, N Chen
Energy & fuels 27 (11), 6587-6593, 2013
Characterization of heavy crude oils, their fractions, and hydrovisbroken products by the asphaltene solubility fraction method
C Ovalles, E Rogel, M Moir, L Thomas, A Pradhan
Energy & fuels 26 (1), 549-556, 2012
Use of a dispersed molybdenum catalyst and mechanistic studies for upgrading extra-heavy crude oil using methane as source of hydrogen
C Ovalles, E Filgueiras, A Morales, I Rojas, JC de Jesus, I Berrios
Energy & fuels 12 (2), 379-385, 1998
Determination of the stability of asphaltenes through physicochemical characterization of asphaltenes
A Prakoso, A Punase, K Klock, E Rogel, C Ovalles, B Hascakir
SPE Western Regional Meeting, 2016
Effect of precipitating conditions on asphaltene properties and aggregation
LC Ortega, E Rogel, J Vien, C Ovalles, H Guzman, F Lopez-Linares, ...
Energy & Fuels 29 (6), 3664-3674, 2015
Upgrading of extra-heavy crude oil by direct use of methane in the presence of water: deuterium-labelled experiments and mechanistic considerations
C Ovalles, A Hamana, I Rojas, RA Bolívar
Fuel 74 (8), 1162-1168, 1995
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