BiographyCesar Ovalles is Technical Team Leader at Chevron Energy Technology Company located in Richmond, California. He has a B.Sc. in Chemistry from Simon Bolivar University and Ph.D. in the same field from Texas A&M University. He worked for 16 years at Petróleos de Venezuela Sociedad Anónima-Instituto de Tecnología Venezolano del Petróleo (PDVSA–INTEVEP). In 2006, he joined Chevron to work in R&D in Petroleum Chemistry and characterization of heavy and extra-heavy Crude Oils and their fractions. He is also involved in new methods for analysis of asphaltenes and in R&D in the chemistry of heavy and extra-heavy crude oil upgrading processes
Areas of Research / Professional Expertise
Petroleum Chemistry, Characterization of Heavy and Extra-Heavy Crude Oils and their fractions, Heavy Oil Upgrading Processes. Supervising a 9-member team in a variety of projects.
Playing tennis and ridding my bike
SYNTHESIS, CHARACTERIZATION, AND SURFACE ACTIVITY OF SURFACTANTS DERIVED FROM NONYLPHENOL, ETHYLENE OXIDE AND CARBON DIOXIDE
Published: Jun 15, 2010 by Journal of Dispersion Science and Technology, Volume 17, 1996 - Issue 4
Authors: C. Ovalles , R. L. Marquez , R. Curci , L. Prat , E. Lujano & J. Portillo
The synthesis of the nonylphenol poly(ethylene carbonate) surfactants derived from nonylphenol (NP), carbon dioxide and ethylene oxide (EO) were carried out with high yields in the presence of alkali metal salts (K2CO3, Na2CO3, K2SnO3 and zinc glutamate) as base catalysts.
The use of nonylphenol formaldehyde resins for preventing asphaltene precipitation in vacuum residues and hydroprocessed petroleum samples
Published: Jun 15, 2010 by Petroleum Science and Technology, Volume 34, 2016 - Issue 4
Authors: Cesar Ovalles, Estrella Rogel, Harris Morazan, Kaidong Chen & Michael E. Moir
This work focused on the synthesis and characterization of nonylphenol formaldehyde resins (NPFR) as examples of active molecules for preventing asphaltene precipitation in vacuum residue (VR) and hydroprocessed petroleum samples. The evaluation for the NPFR as asphaltene dispersants was carried out using the on-column filtration technique at room temperature and near process conditions (195°C).
SURFACE ACTIVITY AND EMULSIFICATION PROPERTIES OF SURFACTANTS DERIVED FROM NONYLPHENOL ETHOXYLATED, ETHYLENE OXIDE AND CARBON DIOXIDE
Published: Mar 27, 2007 by Journal of Dispersion Science and Technology, Volume 18, 1997 - Issue 1
Authors: C. Ovalles , R. L. Marquez , E. Lujano , W. Aular , R. Curci & J. Portillo
The synthesis of new water soluble nonylphenol poly(ethylene carbonate) surfactants derived from nonylphenol ethoxylated (NP(EO)10), ethylene oxide (EO), and carbon dioxide was carried out in high yields in the presence of K2SnO3 as a basic catalysts.
Downhole Upgrading of Extra-heavy Crude Oil Using Hydrogen Donors and Methane Under Steam Injection Conditions
Published: Feb 14, 2007 by Petroleum Science and Technology, Volume 21, 2003 - Issue 1-2
Authors: César Ovalles , Carlos Vallejos , Tito Vasquez , Iraima Rojas , Ursula Ehrman , Jose Luis Benitez & Ronald M
An extra-heavy crude oil underground upgrading process is described which involves the downhole addition of a hydrogen donor additive under steam injection conditions (280–315°C and residence times of at least 24-h). Laboratory experiments showed a 4° increase in the API gravity (from 9 to 12°) of the upgraded product, a two-fold reduction in the viscosity and, an approximately 8% decrease in the asphaltene content with respect to the original crude.