Reaction Kinetics of In-Situ Combustion: Part 2—Modeling

Fassihi, M.R.; Brigham, W.E.; Ramey, H.J.

doi:10.2118/9454-pa

Cited by 85 publications

(44 citation statements)

References 3 publications

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“…Finally, in the HTO reactions the coke is burned generating carbon oxides and water. Both LTO and HTO reactions are generally believed to be heterogeneous gas/liquid or gas/solid reactions (Fassihi et al 1984;Castanier and Brigham 2004). Oxygen from the gas stream diffuses to the surface of the oil/coke, adsorbs on the surface and reacts with a hydrocarbon component.…”

Section: Chemical Reactionsmentioning

confidence: 99%

Efficient integration of stiff kinetics with phase change detection for reactive reservoir processes

et al. 2007

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We propose the use of implicit one-step Explicit Singly Diagonal Implicit Runge-Kutta (ESDIRK) methods for integration of the stiff kinetics in reactive, compositional and thermal processes that are solved using operator-splitting type approaches. To facilitate the algorithmic development we construct a virtual kinetic cell model. The model serves both as a tool for the development and testing of tailored solvers as well as a testbed for studying the interactions between chemical kinetics and phase behavior. As case study, two chemical kinetics models with 6 and 14 components, respectively, are implemented for in situ combustion, a thermal oil recovery process. Through benchmark studies using the 14 component reaction model the new ESDIRK solvers are shown to improve computational speed when compared to the widely used multi-step BDF methods DASSL and LSODE. Phase changes are known to cause convergence problems for the integration method. We propose 384 M. R. Kristensen et al. an algorithm for detection and location of phase changes based on discrete event system theory. Experiments show that the algorithm improves the robustness of the integration process near phase boundaries by lowering the number convergence and error test failures by more than 50% compared to direct integration without the new algorithm.

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Section: Chemical Reactionsmentioning

confidence: 99%

Efficient integration of stiff kinetics with phase change detection for reactive reservoir processes

et al. 2007

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“…The development of the model and the derivation of the above equations were explained in details, elsewhere (Weijdema, 1968;Fassihi et al, 1984). In the model, the temperature is increased at a constant rate.…”

Section: Thermal Analysis and Reaction Kineticsmentioning

confidence: 99%

Retention of SO2 Emission of Coal Combustion by Using Lime in Briquetting

Altun

Hiçyılmaz

Bagci

2006

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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In this study, the effect of lime on control of SO 2 emissions was investigated by briquetting of coal particles with various lime contents. The influence of the added lime was determined not only from the view of its contribution to environmental aspects but also in terms of effects on the thermal features and reaction kinetics of coal. The extent of improvement was determined by detailed sulfur analysis. Thermal qualification and reaction kinetics of the coal briquettes with varying lime contents were performed by evolved gas analysis and its complementing kinetic model based on Arrhenius principles. At the end of experiments, utilization of lime was seen to contribute considerably to desulfurization process. However, lime addition had an adverse effect both on the effectiveness of combustion and the liability of the coal briquettes to oxidize.

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“…Recent studies are more concerned with process kinetics. [8][9][10][11][12][13] A meaningful kinetic model is obviously required to produce meaningful prediction from mathematical modeling. Evidence in the literature 13 -15 indicates that a meaningful kinetic model should reflect the effect of sand-grain surface area and oxygen partial pressure in addition to the matrix oil content.…”

Section: Kinetics Of Crude 011 Combustionmentioning

confidence: 99%

Kinetics of Crude-Oil Coke Combustion

Vossoughi

El-Shoubary

1989

SPE Reservoir Engineering

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Coke is a solid or semiliquid material that deposits on the sand-grain surface area and is eventually burned as a fuel during an in-situ combustion process. Its combustion is the main source of energy to sustain the fire front. This study investigates the effects of different variables-such as specific surface area, oxygen partial pressure, and oil content-on the coke combustion by thermogravimetric analysis (TGA). Each variable was varied while the others were kept constant. The TGA and the derivative thermogravimetric (DTG) curves were subjected to kinetic analysis. The rate equation produced indicated that the rate of coke combustion was proportional to the coke content yet to be burned, oxygen partial pressure, and sand-grain specific surface area. The rate constant followed an Arrheniustype equation for the temperature dependency. The rate equation was tested for the range of specific surface areas of 0.126 to 24.3 m 2 /g [615 to 119,OOO ft 2 IJbm], oil content of 10 to 58 wt%, and oxygen partial pressure of 5 to 50 kPa [0.05 to 0.50 atm]. The model's validity was tested for various crude oils from different geographical locations in the U.S., Canada, and Latin America. IntroductionCoke combustion is the main source of energy in the in-situ combustion process. In-situ combustion, commonly known as fireflooding, is a thermal oil recovery technique in which the oil is ignited underground. It consists of injecting compressed air, or air enriched with oxygen with or without recycled gases. In the case of wet combustion, water is also injected to scavenge heat from the burned zone and/or to quench the front partially. The flow of air and produced gases causes an oil bank to move through the reservoir toward the producing wells. In the field, ignition is achieved either by electrical means or by a gas burner; in some cases, ignition starts just by continuous injection of the air, a process called "auto-ignition."The fuel for the in-situ combustion process is a coke-like residue that deposits on the sand-grain surface area during the process. Whether the combustion can be sustained depends on the rate at which the fuel coke is formed from the original oil and the rate at which this fuel is burned. The fire front is not easy to re-establish after it is extinguished. Hence, the mechanisms by which combustion can be sustained should be fully understood.Fuel deposition depends to a great extent on the low-temperatureoxidation (LTO) reactions. 1.2 Reaction between oxygen and petroleum hydrocarbons carried out at temperatures below about 300°C [572°F] are LTO reactions. In conventional combustion reactions of hydrocarbons, the main reaction products are water and CO 2 , while in LTO reactions, most of the products are in the form of alcohol, aldehydes, ketones, acids, and peracids.Application of thermal analysis techniques in studying crude oil combustion is not new. Tadema 3 seems to be the first investigator who applied differential thermal analysis (DT A) to crude oil combustion and recognized two distinct exothermic ...

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Reaction Kinetics of In-Situ Combustion: Part 2—Modeling

Cited by 85 publications

References 3 publications

Efficient integration of stiff kinetics with phase change detection for reactive reservoir processes

Efficient integration of stiff kinetics with phase change detection for reactive reservoir processes

Retention of SO2 Emission of Coal Combustion by Using Lime in Briquetting

Kinetics of Crude-Oil Coke Combustion

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