Laboratory Studies and Implementation of In-Situ Combustion Initiation Technology for Air Injection Process in the Oil Reservoirs (Russian)

Клинчев, В А; Zatsepin, Vladislav; Ushakova, A. S.; Telyshev, Sergey Vladimirovich

doi:10.2118/171244-ru

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…The kinetic parameters for modeling were taken from a previous experimental study where light and heavy oil components were characterized in terms of Arrhenius parameters obtained by PDSC. 45 During the LTO stage, we observed certain waste of active light saturates and following waste of inhibitors as well. According to refs 11, 15, 45, this process is expressed in two peaks of heat release at kinetic curves (usual PDSC kinetic curves of crude oil oxidation).…”

Section: Discussionmentioning

confidence: 81%

In Situ Combustion of Heavy, Medium, and Light Crude Oils: Low-Temperature Oxidation in Terms of a Chain Reaction Approach

Ushakova

Zatsepin²,

Khelkhal

et al. 2022

Energy Fuels

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Oil oxidation reactions have attracted considerable interest in terms of mechanism comprehension for thermally enhanced oil recovery applications. Many hypotheses regarding oil oxidation mechanisms appear to be disputable even now. The aim of our work was to broaden current knowledge on the crude oil oxidation chain reaction mechanism including the formation behavior of free radicals and hydroperoxides. In this context, we attempted to shed light on the main differences in the oxidation reactions between heavy and light oils. We have found a way to solve both analytically and numerically a set of differential equations for concentrations corresponding to the reaction scheme. Taken together, our findings allowed us to obtain hydroperoxide concentration dependence on time for the initial stages of oxidation. Two main time dependencies were observed, one for low-temperature oxidation (LTO) and the other for high-temperature oxidation (HTO). Both dependencies were revealed in the oxidation experiments of different types of oils and were taken for the matching procedure, which is also presented in this work. The φ-factor of branched-chain reactions, obtained as a combination of reaction rates, determines the efficiency of LTO and transition from LTO to HTO. By matching the experimental data, we were able to find that the success of self-ignition may be achieved only if the concentration ratio of saturated hydrocarbons to inhibitors in crude oil is equal to 2 or more and the temperature is more than 415 K. Under these conditions, the ignition time for heavy oil was 5–7 days, and that for light oil was 15–30 min in oxidation experiments, which were well matched by the presented chain reaction model.

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Section: Discussionmentioning

confidence: 81%

In Situ Combustion of Heavy, Medium, and Light Crude Oils: Low-Temperature Oxidation in Terms of a Chain Reaction Approach

Ushakova

Zatsepin²,

Khelkhal

et al. 2022

Energy Fuels

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“…Figure 4b shows the heat flow curves given by the Arrhenius analysis. 26 For different heating rates, the reaction occurs at the same temperature and the peak heat emission and its temperature increase with increasing heating rate. The qualitative characteristics of the Arrhenius analysis were consistent with the experimental results, thus indicating the feasibility of characterizing the LTO heat release rates using the Arrhenius equation described by eq 7.…”

Section: Resultsmentioning

confidence: 99%

“…Although the oil mass consumption rates for the various pressures had the same characteristics, the LTO heat generation rates were positively correlated with the pressure. Previous work 26 proposed that pressure had a great influence on the evaporation of light components. During LTO of heavy oil, a light hydrocarbon was produced and then volatilized with the increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

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Heat Release Model for the Low Temperature Oxidation of Heavy Oils from Experimental Analyses and Numerical Simulations

et al. 2019

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Low temperature oxidation (LTO) of heavy oils involves many complex reaction mechanisms that are important for the success of ignition and front propagation during in situ combustion (ISC). In this study, experiments and numerical simulations were combined to investigate the heat release characteristics of LTO. Pressure differential scanning calorimeter (PDSC) experimental analyses were used to measure the heat release for various heating rates and pressures under temperatures from 50 to 350 °C. The heat release curves for the various heating rates were consistent with a theoretical Arrhenius analysis, indicating the feasibility of simulating the heat release during the LTO reaction by an Arrhenius equation. The pressure also had a significant effect on the LTO heat release. The results show that the total amount of heat release from LTO is positively correlated with pressure but that the oil consumption rate did not change. A numerical model was used to simulate the PDSC experiments to study the LTO reaction kinetics based on an exothermal Arrhenius reaction model to calculate the heat release rates. The kinetic parameters were obtained using the history matching method with different reaction enthalpies at different pressures to model the effect of pressure on the heat release. The reaction model and kinetic parameters successfully predicted the LTO heat release rates; therefore, these parameters are valuable tools for engineering applications.

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Laboratory Studies and Implementation of In-Situ Combustion Initiation Technology for Air Injection Process in the Oil Reservoirs (Russian)

Cited by 2 publications

References 7 publications

In Situ Combustion of Heavy, Medium, and Light Crude Oils: Low-Temperature Oxidation in Terms of a Chain Reaction Approach

In Situ Combustion of Heavy, Medium, and Light Crude Oils: Low-Temperature Oxidation in Terms of a Chain Reaction Approach

Heat Release Model for the Low Temperature Oxidation of Heavy Oils from Experimental Analyses and Numerical Simulations

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