Hydrogen-donated thermal upgrading of Venezuela extra-heavy oil: identifying the role of hydrogen donor

Chen, Qiang; Yin, Menghui; Zhang, Lingling; Li, He; Qin, Zhihong; Wang, Zongxian

doi:10.1080/10916466.2020.1771366

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…The ability of naphthenic and naphthene-aromatic compounds to improve the conversion of heavy oil raw materials and reduce coke formation has been known for a long time. , Various refining streams, process solvents, and byproducts of organic synthesis are rich in natural hydrogen donors. Several earlier papers have shown that it is possible to use as H-donor additives some industrial distillate oil fractions and technological solvents, or their narrower fractions, in which the content of hydrogen donors prevails over hydrocarbons without donor properties. , Depending on the composition of the heavy oil raw materials and the technological process conditions, the effectiveness of the H-donor additives may vary. Therefore, it is necessary to conduct comparative studies of their composition and effectiveness.…”

Section: Resultsmentioning

confidence: 99%

“…Several earlier papers have shown that it is possible to use as H-donor additives some industrial distillate oil fractions and technological solvents, or their narrower fractions, in which the content of hydrogen donors prevails over hydrocarbons without donor properties. 17,22 Depending on the composition of the heavy oil raw materials and the technological process conditions, the effectiveness of the H-donor additives may vary. Therefore, it is necessary to conduct comparative studies of their composition and effectiveness.…”

Section: Resultsmentioning

confidence: 99%

“…Some examples are light synthetic oils and gas oils; their narrow fractions; technological solvents and byproducts, such as furfural, a slurry and a decant oil (FCCS and FCCDO), a heavy cycle oil (HCO) produced by fluid catalytic cracking, etc. ; these are all studied as industrial H-donors. − However, such H-donor additives are complex mixtures of chemical compounds, depending on their origin, and therefore it is essential to identify candidates with optimal characteristics. The hydrogen-donating ability index is used to find their potential.…”

Section: Introductionmentioning

confidence: 99%

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Application of Ethylene Tar as an Additive in Visbreaking of Petroleum Vacuum Residue

et al. 2021

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The byproduct of ethylene tar has a high content of mono-, bi-, and polycyclic aromatic compounds, as well as cycloalkenes, including aromatic cycloalkenes. This paper evaluates the prospects of using ethylene tar as an additive in the visbreaking process of vacuum residue. A series of experiments on visbreaking of vacuum residue with additives of various refinery streams and ethylene tar were performed in a laboratory flow reactor. As a result of a comparative study of the composition of vacuum residue visbreaking products by different methods, it was shown that the use of ethylene tar compared with kerosene, light cycle oil, and heavy cycle oil allows an increased yield of the target product with a higher proportion of aromatic hydrocarbons. A comparative analysis of the characteristics of asphaltenes and resins of visbreaking products indicates a general trend of changes in the process of visbreaking vacuum residue with refinery streams and ethylene tar. A comparison of the colloidal instability index showed that the use of ethylene tar allows attainment of a more stable visbreaking product concerning refinery streams as additives.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Ethylene Tar as an Additive in Visbreaking of Petroleum Vacuum Residue

et al. 2021

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“…In this sense, recent research projects reported by the PDVSA Research Center, PDVSA-INTEVEP, and the Universidad Central de Venezuela (UCV), have shown how the ISC process might be optimized using catalysts and hydrogen donors. ,,, The use of catalysts has been proposed by different authors to improve the success rate of ignition and enhance the stability of the combustion front, transition metals and their oxide particles being one of the most studied nanoparticle catalysts , because of their good properties to adsorb and activate oxygen/oxygen species and improve the propagation of the combustion front. , A detailed review of the use of different metal-based nanoparticles to improve the performance of ISC is also reported by Simao (2022) . In the same way, a review of in situ upgrading technologies has been reported. ,− The use of hydrogen donors with catalysts ,− , has been proposed in Venezuela to improve the physicochemical properties of highly viscous crude oils in the FPO to mitigate acid gases at reservoir conditions and as an alternative to reduce consumption of diluents and lower lifting and transportation costs …”

Section: Introductionmentioning

confidence: 99%

Workflow of the In Situ Combustion EOR Method in Venezuela: Challenges and Opportunities

Rodriguez¹,

Llamedo

Belhaj

et al. 2023

ACS Omega

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In situ combustion (ISC) is one of the oldest thermal enhanced oil recovery methods to have been applied in Venezuela to increase the production of highly viscous crude oils, with a first field application in 1959 in the Tia Juana Field-Lake Maracaibo Basin. This method, which is characterized by high energy efficiency, consists of injecting air into the reservoir where exothermic oxidation reactions initiate to increase the mobility of the oil. Compared to other thermal enhanced oil recovery methods such as steam injection, ISC has a lower environmental impact in terms of water and fuel consumption, and emission of gases as the produced gases can be reinjected or stored. Several ISC projects have been carried out in Venezuela in Tia Juana, Morichal, Miga, and Melones fields. Although the technical results have been satisfactory in terms of viscosity reduction and improved crude oil properties (such as °API), other important aspects of project evaluations have not been convincing due to the following factors: high temperatures in producing wells, acid gases management, generation of complex emulsions, corrosion, and high CAPEX and OPEX costs. Nevertheless, additional research work has been conducted on process optimization, using catalysts and hydrogen donors, to better address these other factors. Due to the great need to increase hydrocarbon production in Venezuela and to the advantages of ISC as an upgrading technique where low-carbon fuels and hydrogen as byproducts are generated, this paper presents a revisit of ISC projects in Venezuela from R&D technical aspects to field applications. It seeks to identify the main insights regarding the success and failure of the evaluated projects and make substantiated recommendations in the case of future applications of this technology.

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“…Utilization of many different types of additives in coke making and their influence on the modification of thermoplastic properties of coal have been subject to a wide array of experimental investigations. − ,− However, there is a noticeable scarcity of novel theoretical investigations which aim to provide a molecular-level understanding of the influence of organic additives on the development of coal fluidity. To the best of our knowledge, only recently, Hou et al have tried to shed light on the molecular mechanism of coal liquefaction employing density functional theory (DFT) calculations.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Differential Influence of Organic Additives on Coal Fluidity Development: A First-Principles Investigation

et al. 2021

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Formation of high-quality coke is essentially controlled by the development of the extended stability of the coal fluid phase during industrial carbonization processes. Stabilization of coal free radicals through hydrogenation leads to this development of coal fluidity. The donatable hydrogens are usually supplied by the donor hydrogen species formed through the thermal decomposition of a coal macromolecular network. In view of the limited reserve of the donor hydrogen species within a coal system, organic additives with characteristic hydrogen-donating ability are conventionally added to the system to maintain the desirable coal fluidity. However, the choice of compounds requires a clear understanding of their chemistry and associated reaction features. In this context, factors controlling hydrogen-donating properties of some organic donor hydrogen compounds are investigated herein within the framework of density functional theory. A mechanistic interpretation of the reaction of the compounds with the coal radical is offered. In addition to structural modification, the influence of the functional group, namely, the phenolic hydroxyl group, on the hydrogen-donating efficiency of the systems is validated through our calculations. The key role of molecular orbitals in facilitating the release of hydrogens from them is also elucidated. Thus, the work features an advanced understanding of a fundamental industrial process combining a detailed electronic description of the systems. The efficiency of a new compound to act as a superior hydrogen donor candidate is identified. The insights obtained are believed to help derive a rational understanding of the systems and structure−property relationships, which, in turn, can inspire future studies to engineer desired compounds with improved properties. The relevance of our findings to practical carbonization processes is also illustrated in the present work.

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Hydrogen-donated thermal upgrading of Venezuela extra-heavy oil: identifying the role of hydrogen donor

Cited by 7 publications

References 11 publications

Application of Ethylene Tar as an Additive in Visbreaking of Petroleum Vacuum Residue

Application of Ethylene Tar as an Additive in Visbreaking of Petroleum Vacuum Residue

Workflow of the In Situ Combustion EOR Method in Venezuela: Challenges and Opportunities

Deciphering the Differential Influence of Organic Additives on Coal Fluidity Development: A First-Principles Investigation

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