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1

Upgrading of Orinoco Belt crude oil and its fractions by an electrochemical system in the presence of protonating agents

Cesar Ovalles, Iraima Rojas, Socrates Acevedo, Gaston Escobar, Gilberto Jorge, Luis B. Gutierrez, Alfredo Rincon, Benjamin Scharifker

Journal:

Fuel Processing Technology

Year:

1996

Language:

english

File:

PDF, 907 KB

english, 1996

2

[Society of Petroleum Engineers SPE International Thermal Operations and Heavy Oil Symposium - Porlamar, Margarita Island, Venezuela (2001-03-12)] SPE International Thermal Operations and Heavy Oil Symposium - Extra-Heavy Crude Oil Downhole Upgrading Process using Hydrogen Donors under Steam Injection Conditions

Ovalles, Cesar, Vallejos, Carlos, Vasquez, Tito, Martinis, Jorge, Perez-Perez, Alfredo, Cotte, Edgar, Castellanos, Luis, Rodriguez, Hector

Language:

english

File:

PDF, 164 KB

english

3

[ACS Symposium Series] The Boduszynski Continuum: Contributions to the Understanding of the Molecular Composition of Petroleum Volume 1282 || Plausible Locus for Large Paraffinic Compounds in the Boduszynski Continuous Composition Petroleum Model

Ovalles, Cesar, Moir, Michael E.

Year:

2018

Language:

english

File:

PDF, 2.03 MB

english, 2018

4

[ACS Symposium Series] The Boduszynski Continuum: Contributions to the Understanding of the Molecular Composition of Petroleum Volume 1282 || Asphaltenes, What Art Thou?

Ovalles, Cesar, Moir, Michael E.

Year:

2018

Language:

english

File:

PDF, 803 KB

english, 2018

5

[ACS Symposium Series] Chemistry Solutions to Challenges in the Petroleum Industry Volume 1320 || Nitrogen Speciation: Application to Reactivity of Feeds to Hydroprocessing and Catalyst Deactivation

Rahimi, Parviz, Ovalles, Cesar, Zhang, Yunlong, Adams, Jeramie J.

Year:

2019

Language:

english

File:

PDF, 6.46 MB

english, 2019

6

Infections Associated with Resterilized Pacemakers and Defibrillators

Khairy, Thomas F., Lupien, Marie-AndrÃ©e, Nava, Santiago, Baez, Frank Valdez, Ovalle, Fernando Solares, Ochoa, Nery E. Linarez, Mendoza, Gerardo Sosa, Carrazco, Cesar A., Villemaire, Christine, Cartie

Journal:

New England Journal of Medicine

Year:

2020

File:

PDF, 678 KB

2020

7

Upgrading of extra-heavy crude oil by direct use of methane in the presence of water: Deuterium-labelled experiments and mechanistic considerations

Cesar Ovalles, Antonia Hamana, Iraima Rojas, Rafael A. Bolívar

Journal:

Year:

1995

Language:

english

File:

PDF, 819 KB

english, 1995

8

Reversible adsorption of carbon dioxide on amine surface-bonded silica gel

Orlando Leal, Carmelo Bolívar, César Ovalles, Juan José García, Youssef Espidel

Journal:

Inorganica Chimica Acta

Year:

1995

Language:

english

File:

PDF, 550 KB

english, 1995

9

Homogeneous catalysis of methyl formate production from carbon monoxide and methanol in the presence of metal carbonyl catalysts

Donald J. Darensbourg, Robert L. Gray, Cesar Ovalles, Magdalena Pala

Journal:

Journal of Molecular Catalysis

Year:

1985

Language:

english

File:

PDF, 425 KB

english, 1985

10

[Society of Petroleum Engineers SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference - Calgary, Alberta, Canada (2002-11-04)] SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference - Opportunities of Downhole Dielectric Heating in Venezuela: Three Case Studies Involving Medium, Heavy and Extra-Heavy Crude Oil Reservoirs

Ovalles, Cesar, Fonseca, Anyaleth, Lara, Ali, Alvarado, Vladimir, Urrecheaga, Kerin, Ranson, Aaron, Mendoza, Humberto

Language:

english

File:

PDF, 791 KB

english

11

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

Ortega, Lante Carbognani, Rogel, Estrella, Vien, Janie, Ovalles, Cesar, Guzman, Hector, Lopez-Linares, Francisco, Pereira-Almao, Pedro

Journal:

Year:

2015

Language:

english

File:

PDF, 781 KB

english, 2015

12

Downhole Upgrading of Orinoco Basin Extra-Heavy Crude Oil Using Hydrogen Donors under Steam Injection Conditions. Effect of the Presence of Iron Nanocatalysts

Ovalles, Cesar, Rivero, Victor, Salazar, Arelys

Journal:

Year:

2015

Language:

english

File:

PDF, 4.61 MB

english, 2015

13

Method for Determining the Effectiveness of Asphaltene Antifoulants at High Temperature. Application to Residue Hydroprocessing and Comparison with Thermal Fouling Test

Ovalles, Cesar, Rogel, Estrella, Morazan, Harris, Moir, Michael E., Dickakian, Ghazi

Journal:

Year:

2015

Language:

english

File:

PDF, 1.20 MB

english, 2015

14

The use of nonylphenol formaldehyde resins for preventing asphaltene precipitation in vacuum residues and hydroprocessed petroleum samples

Ovalles, Cesar, Rogel, Estrella, Morazan, Harris, Chen, Kaidong, Moir, Michael E.

Journal:

Petroleum Science and Technology

Year:

2016

Language:

english

File:

PDF, 780 KB

english, 2016

15

Asphaltene Densities and Solubility Parameter Distributions: Impact on Asphaltene Gradients

Rogel, Estrella, Ovalles, Cesar, Bake, Kyle D., Zuo, Julian Y., Dumont, Hadrien, Pomerantz, Andrew E., Mullins, Oliver C.

Journal:

Year:

2016

Language:

english

File:

PDF, 1.38 MB

english, 2016

16

Physical and Numerical Simulations of Subsurface Upgrading by Use of Solvent Deasphalting in a Heavy-Crude-Oil Reservoir

Ovalles, Cesar, Rogel, Estrella, Alboudwarej, Hussein, Inouye, Art T., Benson, Ian P., Vaca, Pedro

Journal:

SPE Reservoir Evaluation & Engineering

Year:

2016

Language:

english

File:

PDF, 1.63 MB

english, 2016

17

[ACS Symposium Series] The Boduszynski Continuum: Contributions to the Understanding of the Molecular Composition of Petroleum Volume 1282 || From a Dream to a Fact: Direct Measurement of Vanadium and Nickel Distribution in Crude Oil Cuts Fraction (800−1250 °F)

Ovalles, Cesar, Moir, Michael E.

Year:

2018

Language:

english

File:

PDF, 2.01 MB

english, 2018

18

[ACS Symposium Series] Chemistry Solutions to Challenges in the Petroleum Industry Volume 1320 || Total Chloride Analysis in Petroleum Crude Samples: Challenges and Opportunities

Rahimi, Parviz, Ovalles, Cesar, Zhang, Yunlong, Adams, Jeramie J.

Year:

2019

File:

PDF, 4.00 MB

2019

19

Synthesis and Characterization of Molybdenum Based Colloidal Particles

Beatriz Moreno, Olivia Vidoni, Cesar Ovalles, Bruno Chaudret, Caribay Urbina, Heinz Krentzein

Journal:

Journal of Colloid and Interface Science

Year:

1998

Language:

english

File:

PDF, 912 KB

english, 1998

20

Selective homogeneous production of alkyl formate from CO and alcohol using metal carbonyl/alkoxide catalyst systems

Donald J. Darensbourg, Robert L. Gray, Cesar Ovalles

Journal:

Journal of Molecular Catalysis

Year:

1987

Language:

english

File:

PDF, 1.45 MB

english, 1987

21

Homogeneous catalytic synthesis of formaldehyde using the tungsten carbonyl complex [(CO)5WCl]− in the presence of sodium methoxide

Cesar Ovalles, Carolina Fernández, Donald J. Darensbourg

Journal:

Journal of Molecular Catalysis

Year:

1994

Language:

english

File:

PDF, 731 KB

english, 1994

22

Use of a dispersed iron catalyst for upgrading extra-heavy crude oil using methane as source of hydrogen☆

Cesar Ovalles, Eduardo Filgueiras, Alfredo Morales, Carlos E. Scott, Fernando Gonzalez-Gimenez, B. Pierre Embaid

Journal:

Year:

2003

Language:

english

File:

PDF, 231 KB

english, 2003

23

Structure/interfacial activity relationships and thermal stability studies of Cerro Negro crude oil and its acid, basic and neutral fractions

Cesar Ovalles, María del Carmen García, Eduardo Lujano, Williams Aular, Reinaldo Bermúdez, Edgar Cotte

Journal:

Year:

1998

Language:

english

File:

PDF, 755 KB

english, 1998

24

Homologation of propene with methane using nickel-supported catalysis: A surface characterization study

Cesar Ovalles, Vladimir Leon, Sheila Reyes, Francisco Rosa

Journal:

Journal of Catalysis

Year:

1991

Language:

english

File:

PDF, 934 KB

english, 1991

25

Use of a Dispersed Molybdenum Catalyst and Mechanistic Studies for Upgrading Extra-Heavy Crude Oil Using Methane as Source of Hydrogen

Ovalles, Cesar, Filgueiras, Eduardo, Morales, Alfredo, Rojas, Iraima, de Jesus, Juan Carlos, Berrios, Irenio

Journal:

Year:

1998

Language:

english

File:

PDF, 139 KB

english, 1998

26

Characterization of Heavy Crude Oils, Their Fractions, and Hydrovisbroken Products by the Asphaltene Solubility Fraction Method

Ovalles, Cesar, Rogel, Estrella, Moir, Michael, Thomas, Lori, Pradhan, Ajit

Journal:

Year:

2012

Language:

english

File:

PDF, 1.33 MB

english, 2012

27

Homogeneous catalysts for carbon dioxide/hydrogen activation. Alkyl formate production using anionic ruthenium carbonyl clusters as catalysts

Darensbourg, Donald J., Ovalles, Cesar, Pala, Magdalena

Journal:

Journal of the American Chemical Society

Year:

1983

Language:

english

File:

PDF, 449 KB

english, 1983

28

Asphaltene Stability in Crude Oils and Petroleum Materials by Solubility Profile Analysis

Rogel, Estrella, Ovalles, Cesar, Moir, Michael

Journal:

Year:

2010

Language:

english

File:

PDF, 982 KB

english, 2010

29

Use of CO 2 -Triggered Switchable Surfactants for the Stabilization of Oil-in-Water Emulsions

Liang, Chen, Harjani, Jitendra R., Robert, Tobias, Rogel, Estrella, Kuehne, Donald, Ovalles, Cesar, Sampath, Vasudevan, Jessop, Philip G.

Journal:

Year:

2012

Language:

english

File:

PDF, 2.51 MB

english, 2012

30

Adsorption of Athabasca Vacuum Residues and Their Visbroken Products over Macroporous Solids: Influence of Their Molecular Characteristics

Lopez-Linares, Francisco, Carbognani, Lante, Hassan, Azfar, Pereira-Almao, Pedro, Rogel, Estrella, Ovalles, Cesar, Pradhan, Ajit, Zintsmaster, John

Journal:

Year:

2011

Language:

english

File:

PDF, 1.18 MB

english, 2011

31

Predicting Reactivity of Feedstocks to Resid Hydroprocessing Using Asphaltene Characteristics

Ovalles, Cesar, Rogel, Estrella, Lopez, Jaime, Pradhan, Ajit, Moir, Michael

Journal:

Year:

2013

Language:

english

File:

PDF, 1.16 MB

english, 2013

32

Sediment Formation in Residue Hydroconversion Processes and Its Correlation to Asphaltene Behavior

Rogel, Estrella, Ovalles, Cesar, Pradhan, Ajit, Leung, Pak, Chen, Nan

Journal:

Year:

2013

Language:

english

File:

PDF, 742 KB

english, 2013

33

Anionic Group 6B metal carbonyls as homogeneous catalysts for carbon dioxide/hydrogen activation. The production of alkyl formates

Darensbourg, Donald J., Ovalles, Cesar

Journal:

Journal of the American Chemical Society

Year:

1984

Language:

english

File:

PDF, 657 KB

english, 1984

34

MECHANISTIC ASPECTS OF CATALYTIC CARBON DIOXIDE METHANATION

DARENSBOURG, DONALD J., BAUCH, CHRISTOPHERG., OVALLES, CESAR

Journal:

Reviews in Inorganic Chemistry

Year:

1985

Language:

english

File:

PDF, 2.08 MB

english, 1985

35

Homogeneous catalytic synthesis of alkyl formates from the reaction of alkyl halides, carbon dioxide, and hydrogen in the presence of anionic Group 6 carbonyl catalysts and sodium salts

Darensbourg, Donald J., Ovalles, Cesar

Journal:

Journal of the American Chemical Society

Year:

1987

Language:

english

File:

PDF, 846 KB

english, 1987

36

Anionic group 6 hydrides and carboxylates as homogeneous catalysts for reduction of aldehydes and ketones

Tooley, Patricia A., Ovalles, Cesar., Kao, S. C., Darensbourg, Donald J., Darensbourg, Marcetta Y.

Journal:

Journal of the American Chemical Society

Year:

1986

Language:

english

File:

PDF, 686 KB

english, 1986

37

Catalytic carbon dioxide methanation by alumina-supported mono- and polynuclear ruthenium carbonyls

Darensbourg, Donald J., Ovalles, Cesar

Journal:

Inorganic Chemistry

Year:

1986

Language:

english

File:

PDF, 818 KB

english, 1986

38

Asphaltene Chemical Characterization as a Function of Solubility: Effects on Stability and Aggregation

Rogel, Estrella, Ovalles, Cesar, Moir, Michael

Journal:

Year:

2012

Language:

english

File:

PDF, 1.17 MB

english, 2012

39

Determination of Asphaltenes in Crude Oil and Petroleum Products by the on Column Precipitation Method

Rogel, Estrella, Ovalles, Cesar, Moir, Michael E., Schabron, John F.

Journal:

Year:

2009

Language:

english

File:

PDF, 1.75 MB

english, 2009

40

Downhole Upgrading of Extra-heavy Crude Oil Using Hydrogen Donors and Methane Under Steam Injection Conditions

Ovalles, César, Vallejos, Carlos, Vasquez, Tito, Rojas, Iraima, Ehrman, Ursula, Benitez, Jose Luis, Martinez, Ronald

Journal:

Petroleum Science and Technology

Year:

2003

Language:

english

File:

PDF, 429 KB

english, 2003

41

Effect of temperature on the analysis of asphaltenes by the on-column filtration/redissolution method

Ovalles, Cesar, Rogel, Estrella, Moir, Michael E., Morazan, Harris

Journal:

Year:

2015

Language:

english

File:

PDF, 3.46 MB

english, 2015

42

Dosimetric Algorithm to Reproduce Isodose Curves Obtained from a LINAC

Estrada Espinosa, Julio Cesar, Martínez Ovalle, Segundo Agustín, Pereira Benavides, Cinthia Kotzian

Journal:

Computational and Mathematical Methods in Medicine

Year:

2014

Language:

english

File:

PDF, 1.49 MB

english, 2014

43

Asphaltene Solubility Properties by In-line Filtration Method

Rogel, Estrella, Ovalles, Cesar, Vien, Janie, Moir, Michael

Journal:

Year:

2015

Language:

english

File:

PDF, 699 KB

english, 2015

44

Asphaltene content by the in-line filtration method

Rogel, Estrella, Ovalles, Cesar, Vien, Janie, Moir, Michael

Journal:

Year:

2016

Language:

english

File:

PDF, 863 KB

english, 2016

45

Thermal Crackability/Processability of Oils and Residua

Carbognani Ortega, Lante A, Carbognani, Josune, Rogel, Estrella, Ovalles, Cesar, Vien, Janie, Morazan, Harris, Lopez-Linares, Francisco A, Pereira-Almao, Pedro Rafael

Journal:

Year:

2016

Language:

english

File:

PDF, 677 KB

english, 2016

46

The residual oil saturation determination for Steam Assisted Gravity Drainage (SAGD) and Solvent-SAGD

Kar, Taniya, Ovalles, Cesar, Rogel, Estrella, Vien, Janie, Hascakir, Berna

Journal:

Year:

2016

Language:

english

File:

PDF, 1.63 MB

english, 2016

47

Asphaltene characterization of paraffinic crude oils

Rogel, Estrella, Ovalles, Cesar, Vien, Janie, Moir, Michael

Journal:

Year:

2016

Language:

english

File:

PDF, 1.52 MB

english, 2016

48

Synthesis, characterization, and mechanism of asphaltene inhibition of phosphopropoxylated asphaltenes

Ovalles, Cesar, Rogel, Estrella, Morazan, Harris, Moir, Michael E.

Journal:

Year:

2016

Language:

english

File:

PDF, 2.06 MB

english, 2016

49

[Society of Petroleum Engineers SPE Western Regional Meeting - Anchorage, Alaska, USA (2016-05-23)] SPE Western Regional Meeting - Determination of the Stability of Asphaltenes Through Physicochemical Characterization of Asphaltenes

Prakoso, Andreas, Punase, Abhishek, Klock, Kristina, Rogel, Estrella, Ovalles, Cesar, Hascakir, Berna

Language:

english

File:

PDF, 4.84 MB

english

50

[Society of Petroleum Engineers SPE International Symposium on Oilfield Chemistry - The Woodlands, Texas, USA (2015-04-13)] SPE International Symposium on Oilfield Chemistry - Method for Rapid Assessment of Additives to Prevent Asphaltene Precipitation at Reservoir Conditions

Ovalles, Cesar, Rogel, Estrella, Morazan, Harris, Moir, Michael E.

Language:

english

File:

PDF, 926 KB

english