Formation of stable emulsions under in-situ combustion conditions: An assessment of the injected gas−crude oil−water−rock interplay in Quifa oilfield, Los Llanos Basin, Colombia

Orea, Miguel; Bruzual, Jenny; Diaz, A.; Árraga, Tito; Benítez, Nelson; Castillo, Jimmy

doi:10.1016/j.petrol.2017.09.026

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Hence, physicochemical changes in asphaltene structure during thermal EOR recovery processes may worsen the emulsification process [33,34]. In this way, in the field trial for ISC that was implemented in the Quifa Field located on the eastern plains of Colombia an emulsion problem was observed [35,36]. The field trial was planned in three stages: an initial cold production stage, followed by a preheating stage, and finally a heat production stage.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Asphaltene Oxidation Process on the Formation of Emulsions of Water in Oil (W/O) Model Solutions

et al. 2018

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In this paper, the formation of water in oil (W/O) model solution emulsions using untreated and oxidized asphaltenes as emulsifiers was evaluated. Emulsions were formed with deionized water and toluene at different water/toluene ratios (1:4, 1:1, and 4:1) and concentrations of asphaltenes of 100, 500, and 1000 mg/L. Asphaltenes were oxidized at two different temperatures of 373 and 473 K for various exposure times. Untreated and oxidized asphaltenes were characterized by thermogravimetric analyses, C, H, N, S and O elemental analyses, solvency tests in toluene, and qualitative structural indexes from Fourier-transform infrared spectroscopy. The emulsions were evaluated for stability, the percentage of oil in water (O/W) and W/O phases, interfacial tension (IFT), and mean droplet diameter. The asphaltenes solubility decreased up to 93% as the temperature of oxidation and the exposure time increased. The amount of W/O emulsion increases when asphaltene concentration, exposure time, and oxidation temperature increase. With oxidized asphaltenes at 373 and 473 K, the formation of W/O emulsions increased by approximately 30% and 70% for a fixed asphaltene concentration, respectively. IFT revealed that after oxidation, no carboxylic acids were formed. A hypothetical oxidation reaction of asphaltenes to ketones and sulphoxide, and nitrogen and alkyl chain removal is proposed.

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Section: Introductionmentioning

confidence: 99%

Effect of the Asphaltene Oxidation Process on the Formation of Emulsions of Water in Oil (W/O) Model Solutions

et al. 2018

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“…The fuel for a forward ISC is the coke-like residue formed via pyrolysis of large hydrocarbons, mostly asphaltenes, in the cracking/vaporization zone downstream of the combustion front . For successful ISC processes, potentials such as a recovery factor of almost up to 85% and upgrading of 5–7° API points for the produced oil are proposed. , However, instability of the combustion front, cap-rock fracturing, and viscosity increase due to low-temperature oxygenation are the major problems making a large-scale deployment of the current ISC technologies uncertain. − The reactivity along with the rate and uniformity of the deposition of the fuel in the porous media controls the stability of the combustion front and thereby the ISC success …”

Section: Introductionmentioning

confidence: 99%

Pyrolysis and Oxidation of Asphaltene-Born Coke-like Residue Formed onto in Situ Prepared NiO Nanoparticles toward Advanced in Situ Combustion Enhanced Oil Recovery Processes

Biyouki

Hosseinpour²,

Nassar

2018

Energy Fuels

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Pyrolysis and oxidation of asphaltene-born coke-like residue formed onto ex situ and in situ prepared NiO nanoparticles as initial steps toward developing advanced in situ combustion enhanced oil recovery (EOR) processes were studied. The in situ synthesized NiO nanoparticles in heavy oil matrix, containing coke-like residue, were characterized by X-ray diffraction, Brunauer−Emmett−Teller, field-emission scanning electron microscopy, and energy-dispersive X-ray mapping techniques. The pyrolysis and postpyrolysis oxidation of the coke residue were investigated by temperature-programmed pyrolysis (TPP) and temperature-programmed oxidation (TPO) methods, respectively. Oxidation kinetics of the coke residue was described by the Kissinger−Akahira−Sunose isoconversional method. The results showed a higher percentage of coke residue on the in situ prepared nanoparticles than the ex situ employed ones. Eventually, during the TPP of the coke residue, the amount of carbon oxides released per total amount of the coke is 18.6% higher for the in situ NiO as compared to the ex situ NiO nanoparticles. This may be attributed to the uniform dispersion of the in situ NiO in the coke residue. Furthermore, compared to the ex situ NiO, the in situ NiO nanoparticles shift the oxidation temperature of the coke residue by about 100 °C to lower temperature. Multistep kinetics was predicted with a significant drop of the activation energy of the oxidation of the coke residue in the presence of in situ and ex situ NiO nanoparticles, confirming their catalytic effect. However, the preexponential factor, as a representation of the collision efficiency, is significantly higher over the in situ NiO compared to the ex situ NiO, leading to the enhanced oxidation of the coke residue. This may be attributed to the loss of surface area due to particle aggregation for the case of ex situ preparation, as well as the orientation of asphaltene molecules during the adsorption onto the surface. The asphaltenes could be aligned mostly vertically over the in situ NiO surface; thus the vertical alignment provides good channels for diffusion of gas-phase oxygen onto the surface leading to high collision efficiency and catalytic activity.

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Thermodynamic assessment of hydrothermal combustion assisted fossil fuel in-situ gasification in the context of sustainable development

Zhang

Wang

Duan

et al. 2023

Fuel

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Formation of stable emulsions under in-situ combustion conditions: An assessment of the injected gas−crude oil−water−rock interplay in Quifa oilfield, Los Llanos Basin, Colombia

Cited by 5 publications

References 28 publications

Effect of the Asphaltene Oxidation Process on the Formation of Emulsions of Water in Oil (W/O) Model Solutions

Effect of the Asphaltene Oxidation Process on the Formation of Emulsions of Water in Oil (W/O) Model Solutions

Pyrolysis and Oxidation of Asphaltene-Born Coke-like Residue Formed onto in Situ Prepared NiO Nanoparticles toward Advanced in Situ Combustion Enhanced Oil Recovery Processes

Thermodynamic assessment of hydrothermal combustion assisted fossil fuel in-situ gasification in the context of sustainable development

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