Air Injection-Improved Determination of the Reaction Scheme With Ramped Temperature Experiment and Numerical Simulation

Dechelette, B.; Heugas, O.; Quenault, Gerard; Bothua, J.; Christensen, J.R.

doi:10.2118/06-01-03

Cited by 37 publications

(17 citation statements)

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“…If a parameter is needed but was not provided in the original study, then the values used here are given in the Appendix. In this study four kinetic models are compared: Belgrave (1993), Dechelette (2006), STARS, and Cinar et al (2011).…”

Section: Simulation Resultsmentioning

confidence: 99%

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Assessing the Consistency of Measurements and Models for the Kinetics of In Situ Combustion

Çınar

Kovscek

2015

Day 3 Wed, September 30, 2015

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One method to access unconventional, heavy-oil and natural bitumen resources is to apply in situ combustion (ISC) to oxidize in place a small fraction of the hydrocarbon thereby providing heat to reduce oil viscosity and pressure that enhances recovery. ISC is also attractive because it provides the opportunity to upgrade oil in-situ by increasing the API gravity and decreasing, for instance, sulfur content. The complex nature of petroleum as a multi-component mixture and the multi-step character of oxidation reactions complicates substantially the kinetic analysis of crude-oil oxidation. Isoconversional techniques provide model-free methods for estimating activation energy and naturally deconvolve multi-step reactions. The isoconversional fingerprint is, essentially, the profile of activation energy as a function of temperature (from low to high) of the sample. As such, isoconversional methods are also useful as a screening tool to categorize the burning characteristics of different oils. In the literature there are substantially different kinetic models for the representation of reactions during in situ combustion. Some models feature multistep reactions in series whereas other models combine series and parallel reaction steps. Interestingly, there is no study comparing these models with each other as well as consistent experimental data. In this study, the performance of different models proposed in the literature and a new model is tested using kinetic cell simulations and compared to new experimental data. As the basis of the comparison, the isoconversional fingerprints associated with the models existing in the literature are compared. Results indicate that most of the models proposed are unable to reproduce the typical isoconversional fingerprint measured for crude-oil combustion. This lack of agreement explains, in part, the poor predictability of reactive transport simulations of ISC. Importantly, this work illustrates a methodology for assessing the consistency of a kinetic model with experimental data and identifies physically consistent models.

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Section: Simulation Resultsmentioning

confidence: 99%

“…A different reactor type is used for RTO experiments by Dechelette et al (2006). They used an adiabatic disk reactor and the heating schedule is imposed by two steps.…”

Section: Literature Reviewmentioning

confidence: 99%

Assessing the Consistency of Measurements and Models for the Kinetics of In Situ Combustion

Çınar

Kovscek

2015

Day 3 Wed, September 30, 2015

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“…We now consider a case, HAI, with chemical reactions simulating an in-situ combustion process. We use a reaction scheme from Dechelette et al (2006), with a combined fuel deposition and low-temperature oxidation (FD/LTO) reaction and two high-temperature oxidation (HTO) reactions burning solid fuel:…”

Section: Hot Air Injection (Hai)mentioning

confidence: 99%

“…To estimate the efficiency of recovery methods, capturing the displacement processes is crucial. We use a combustion reaction scheme from Dechelette et al (2006) to study the lumping effects in the presence of exothermic reactions. We illustrate that the non-linearity and tight coupling of the problem leads to a loss in accuracy when using aggressive lumping of hydrocarbon pseudo-components.…”

Section: Introductionmentioning

confidence: 99%

Compositional Effects in Thermal, Compositional and Reactive Simulation

Cremon,

Gerritsen

2020

Preprint

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In this work, we study the influence of several compositional effects on thermal and reactive processes.First, we consider the influence of using different lumped pseudo-components. Advanced thermodynamic equilibrium computations are typically required to model the phase behavior in the numerical simulation of thermal recovery processes. Such phase behavior models rely on compositional descriptions of the oil using up to tens of components to obtain accurate solutions. Lumping a large number of components into a smaller number of pseudo-components in order to reduce the computational cost is standard practice for thermal simulations. However, the impact the lumping process has on the displacement processes can be hard to estimate a priori. Thermal, compositional and reactive simulations (such as In-Situ Combustion -ISC) exhibit a tight coupling between mass and energy conservation, through phase behavior, heat transport and reactions. We observe that depending on the number and type of lumped pseudo-components retained in the simulation, the results can exhibit modeling artefacts and/or fail to capture the relevant displacement processes. We illustrate that for several thermal hot gas injection processes, with and without chemical reactions, the displacement results using a small number of pseudo-components do not capture the physical phenomena. Lumping heavy components together overestimates the size of the oil banks and gives inaccurate speeds for multiple fronts.Then, we consider the effects of different compositional interpretations of the lumped pseudo-species appearing in typical reaction schemes. Due to compositional effects, they strongly impact the behavior of the solutions through the intricate interplay between reactions, phase behavior and

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“…These two types of reactions were investigated by a number of authors in great detail (e.g. Alexander et al 1972, Bae 1977, Adegbesan et al 1987, Dechelette et al 2006, Lapene et al 2008, Sequera et al 2010, Freitag 2010, Hascakir et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Near Wellbore and Reservoir Effects in In-Situ Combustion

et al. 2015

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In addition to the physical processes relevant in conventional oil production, additional physical-chemical processes have to be considered for in-situ combustion. These processes include heat conduction, steam drive and the kinetics and thermodynamics of combustion.To determine the kinetic and thermodynamic parameters, kinetic cell and combustion tube experiments were performed.In this study, oil from a commercially producing in-situ combustion field was sampled. A newly developed kinetic cell was used which enabled performing experiments at various heating rates. The large range of heating rates is used for describing the reactions in the combustion tube and near-wellbore as well as for the conditions at the front in a larger distance from the wells.The near-wellbore during in-situ combustion is characterized by fast movement of the combustion front, large heating rates at a given location and spatial separation of low-and high temperature combustion reactions.Once the front propagates further away from the wells, the speed of the front reduces to less than 0.05 m/d. At this speed of the front, heat conduction ahead of the front warms the reservoir up without oxygen being present. Oxygen arriving at the front results in Low and High Temperature Oxidation occurring almost simultaneously.The far-field conditions were mimicked by pre-heating a kinetic cell prior to exposing it to air. These experiments showed that for these conditions, the high and low temperature oxidation reactions cannot be distinguished and could be approximated by a single reaction.This study shows that a simplified reaction scheme might be used to simulate the reservoir effects of combustion whereas for simulating the early phase of an in-situ combustion project, a more exhaustive set of chemical reactions might be required.The results of the study can be used to investigate the start-up phase of an in-situ combustion project (near-wellbore effect focus) and the effects during advancement of the combustion front in the reservoir.Using the example of a Central European field operated using in-situ combustion in a line-drive configuration, the near-wellbore and far field operational aspects are shown.

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Air Injection-Improved Determination of the Reaction Scheme With Ramped Temperature Experiment and Numerical Simulation

Cited by 37 publications

References 0 publications

Assessing the Consistency of Measurements and Models for the Kinetics of In Situ Combustion

Assessing the Consistency of Measurements and Models for the Kinetics of In Situ Combustion

Compositional Effects in Thermal, Compositional and Reactive Simulation

Near Wellbore and Reservoir Effects in In-Situ Combustion

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