Kinetic Models for Low Temperature Oxidation Subranges based on Reaction Products

Kapadia, Punitkumar R.; Gates, Ian D.; Mahinpey, Nader; Khansari, Zeinab

doi:10.2118/165527-ms

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…The LTO characteristics of heavy oils are obviously different from light oils [6,32,33] . Hence, in order to establish a more general LTO kinetics model, the ratio of hydrocarbon oxides participating in decarbonylation to total hydrocarbon oxides produced from oxidation, Rdec, is introduced, then:…”

Section: Lto Kinetics Model Of Heavy Oilsmentioning

confidence: 92%

Low-Temperature Oxidation Characteristics and Its Effect on the Critical Coking Temperature of Heavy Oils

et al. 2015

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Air assisted steam stimulation (huff and puff) is an innovative process for enhanced heavy oil recovery. In this paper, the low temperature oxidation (LTO) and coking experiments were conducted to reveal the LTO characteristics of heavy oils and its effect on the oil critical coking temperature. The O2 consuming ability and oxidation activity of different oils, in a temperature range of 80-170 o C, were analyzed, including typical light and heavy oil samples. The experimental results show that heavy oils have a higher oxidation activity at low temperature than that of light oils. Heavy oils can effectively consume O2 in the injected air and produce a certain amount of CO2 under reservoir conditions. In terms of the difference in LTO characteristics of different oils, a more general LTO reaction kinetics model of crude oils in reservoir was established. A parameter, Rdec (ratio of hydrocarbon oxides participating in decarbonylation to total hydrocarbon oxides produced from oxidation), is introduced to indicate the O2-to-CO2 conversion features of different oils during LTO process. The Rdec, Ea and ko of heavy oils are usually lower than those of light oils, which can well reflect the LTO characteristics of heavy oils and demonstrate that heavy oils are more easily oxidized at low temperature. However, due to more heavy oil components generated during LTO process, the critical coking temperature of heavy oils exposed to air environment will decrease (by 120 o C from 400 o C to 280 o C for super heavy oil). It should be noted that the effect of LTO process on critical coking temperature is different for different heavy oils, and the induced coking risks are also different in different heavy oil reservoirs, which need further studies in lab and field.

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Section: Lto Kinetics Model Of Heavy Oilsmentioning

confidence: 92%

Low-Temperature Oxidation Characteristics and Its Effect on the Critical Coking Temperature of Heavy Oils

et al. 2015

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“…This discussion reveals that the conventional analysis of thermal experimental data to obtain a single set of kinetic data based on Equation 1 may not be practically very useful. Khansari et al [44] have provided a series of kinetic data based on the reaction products for the LTO stage, which makes the kinetic model more adequate for modeling the LTO process.…”

Section: Kinetic Study Of Crude Oil By Using Thermal Experimentsmentioning

confidence: 99%

Discussion of thermal experiments’ capability to screen the feasibility of air injection

Huang

Sheng

2017

Fuel

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Thermal experiments such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), accelerating rate calorimetry (ARC), and small batch reactor (SBR) are typically used to screen the feasibility of air injection in a reservoir. In this paper, the capability of these tools were studied. The screening criteria for air injection process (AIP) based on the thermal experiments were summarized. A practical workflow to use the thermal experiments to build a base simulation model for AIP it was proposed. In an AIP simulation model, there are about 12 variables to govern the process. Generally, researchers consider kinetic data as adjustable variables to match experimental or field data. How to properly adjust the kinetic data and understand the effect of the kinetic data on the production performance of a reservoir are not well established. In this paper, the reaction temperature ranges and the exothermic peak temperatures for the low temperature oxidation (LTO) stage and high temperature oxidation (HTO) stage were summarized from the experiments using 19 crude oils. The measured kinetic data of 22 different crude oils, and the kinetic data of 25 sets of crude oils with the presence of additives were also summarized. From these data, the ranges of activation energy and frequency factor were defined as the reference for future studies, if such data are readily available. A simulation study has been conducted to study the significance of the kinetic data on production performance. It is observed that the variation of the activation energy significantly influence the recovery performance while the variation of the frequency factor does not.

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“…In general, there will be a series of reactions between crude oil and oxygen once they are in contact. Oxygen atoms are first bound into the carbon chains and the hydrocarbon compounds are converted into ketones, aldehydes, alcohols, and other partially oxidized materials (Kapadia et al 2013). After that, the chain scission reaction occurs.…”

Section: Analyses Of Viscosity Reduction Mechanisms and Oxidation Modelsmentioning

confidence: 99%

In situ catalytic upgrading of heavy crude oil through low-temperature oxidation

Jia

Liu

et al. 2016

Pet. Sci.

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The low-temperature catalytic oxidation of heavy crude oil (Xinjiang Oilfield, China) was studied using three types of catalysts including oil-soluble, watersoluble, and dispersed catalysts. According to primary screening, oil-soluble catalysts, copper naphthenate and manganese naphthenate, are more attractive, and were selected to further investigate their catalytic performance in in situ upgrading of heavy oil. The heavy oil compositions and molecular structures were characterized by column chromatography, elemental analysis, and Fourier transform infrared spectrometry before and after reaction. An Arrhenius kinetics model was introduced to calculate the rheological activation energy of heavy oil from the viscosity-temperature characteristics. Results show that the two oil-soluble catalysts can crack part of heavy components into light components, decrease the heteroatom content, and achieve the transition of reaction mode from oxygen addition to bond scission. The calculated rheological activation energy of heavy oil from the fitted Arrhenius model is consistent with physical properties of heavy oil (oil viscosity and contents of heavy fractions). It is found that the temperature, oil composition, and internal molecular structures are the main factors affecting its flow ability. Oil-soluble catalyst-assisted air injection or air huff-n-puff injection is a promising in situ catalytic upgrading method for improving heavy oil recovery.

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Kinetic Models for Low Temperature Oxidation Subranges based on Reaction Products

Cited by 11 publications

References 17 publications

Low-Temperature Oxidation Characteristics and Its Effect on the Critical Coking Temperature of Heavy Oils

Low-Temperature Oxidation Characteristics and Its Effect on the Critical Coking Temperature of Heavy Oils

Discussion of thermal experiments’ capability to screen the feasibility of air injection

In situ catalytic upgrading of heavy crude oil through low-temperature oxidation

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