Contribution of thermal analysis and kinetics of Siberian and Tatarstan regions crude oils for in situ combustion process

Varfolomeev, Mikhail A.; Nagrimanov, Ruslan N.; Galukhin, Andrey; Vakhin, Аlexey V.; Solomonov, Boris N.; Нургалиев, Д. К.; Kök, Mustafa Verşan

doi:10.1007/s10973-015-4892-6

Cited by 41 publications

(31 citation statements)

References 13 publications

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“…The samples of oil were extracted from an Ashalchinskoe oil field (Volga–Ural basin, Republic Tatarstan, Russia) and presented a petroleum system with a rather high content of vanadyl (see Introduction) and high-molecular weight components (see Table ). The four components of the oil, such as saturates, aromatics, resins, and asphaltenes (SARA), were separated and quantified by extraction ( n -alkane) and further chromatographic separation of the nonasphaltic oil components through columns filled with alumina. , Elemental analysis of crude oil was carried out on a PerkinElmer 2400 Series II elemental analyzer based on dynamic flash combustion of the sample . The corresponding data are presented in Table .…”

Section: Methodsmentioning

confidence: 99%

Native Vanadyl Complexes in Crude Oil as Polarizing Agents for In Situ Proton Dynamic Nuclear Polarization

et al. 2019

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The presence of paramagnetic species such as vanadyl complexes (VO2+) and free carbon radicals in petroleum disperse systems (PDSs) such as crude oil, bitumen, or kerogen causes significant interest of studying the structure of PDS, high-molecular weight components, and their effects on the physical and chemical properties of PDS products by magnetic resonance techniques. However, the lack of detailed studies keeps the exact structure, aggregation mechanism, and interaction with complex composites of the PDS still disputable. In this contribution, detailed electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) investigations, including advanced fast field cycling dynamic nuclear polarization, of heavy crude oil focused on vanadyl complexes are presented. A perceptible room-temperature 1H dynamic nuclear polarization (DNP) solid effect at the X-band (magnetic field of 300–400 mT corresponding to the EPR frequency of 9.5 GHz and NMR frequency of 14.6 MHz), with enhancement ±5, is observed at moderate microwave irradiation power in crude oil with a high concentration of VO2+, while no Overhauser DNP contribution is found. Using NMR T 2-encoding, DNP spectra and molecular dynamics, two components are distinguished, from which the one with slower dynamics exhibits higher DNP enhancement via VO2+ complexes. The observed difference is discussed in terms of electron–nuclear interaction and relative parts of hyperpolarized nuclear spins using an advanced model for DNP data simulation.

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Section: Methodsmentioning

confidence: 99%

Native Vanadyl Complexes in Crude Oil as Polarizing Agents for In Situ Proton Dynamic Nuclear Polarization

et al. 2019

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“…Characteristics of Rocks. According to the data of X-ray diffraction and thermal analysis [26][27][28], the samples studied differ in mineral composition, OM content in rocks, including insoluble kerogen, which is typical for different sedimentation environments. Thus, the rock sample from the Berezovskaya area contains 88.87% of quartz and 11.13% of calcite, and the sample from Zelenogorskaya contains 99.76% of calcite and only 0.24% of quartz.…”

Section: Resultsmentioning

confidence: 99%

“…The investigated samples of rocks differ in mass loss with an increase in temperature from 20 to 900°C and the presence of thermal effects associated with the decomposition of organic matter in rocks and the dissociation of carbonate minerals. The content of OM was estimated from the mass loss of rock samples in the temperature range 200-600°C, since at temperatures of 20 to 200°C, mainly adsorbed water is removed and evaporation of volatile hydrocarbons from the rock; losses above 650°C are related as mentioned above, with the destruction of carbonate minerals [26].…”

Section: Resultsmentioning

confidence: 99%

Influence of Hydrothermal and Pyrolysis Processes on the Transformation of Organic Matter of Dense Low-Permeability Rocks from Domanic Formations of the Romashkino Oil Field

et al. 2018

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The model experiments regarding the conversion of organic matters from carbonate rock samples of Dankov-Lebedyan deposits of Zelenogorskaya area and siliceous-carbonate rocks of Semiluki-Mendym deposits of Berezovskaya area of Domanic formations of Romashkino oil field were carried out. Two types of experiments were carried out: (1) the hydrothermal treatment of rocks at a temperature of 350°C in the presence of carbonic acid and a water content of 30%; (2) pyrolysis at temperatures of 350 and 600°C in the presence of hydrogen. The yield and quality of extracted hydrocarbons from the rocks depending on the mineral composition of rocks, content and composition of organic matter, and thermal stability of kerogen under hydrothermal influences were evaluated. Application of electron paramagnetic resonance in pyrolysis processes revealed the difference in mineral content of rocks (Mn2+, SO3−, and SO2− ions) and free radicals R∗, as well as in vanadyl ion (VO2+) concentration. It is established that an increasing temperature of pyrolysis promotes the formation of new free organic radicals in rock samples: in Domanic rocks of Semiluki-Mendym deposits at 350°С and in carbonate rocks of Dankov-Lebedyan horizon at 600°С. This indicates different ability of oil-generating potential of rocks with hydrothermal and pyrolysis technologies.

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“…In addition, China’s heavy oil resources are dominated by the northwest and Liaohe oilfield, representing more than 60% of the nation’s total oil. Due to the decreasing oil production of conventional and mature reservoirs coupled with the rapid increase in global energy demand in recent years, heavy oils have become an increasingly significant energy resource. − As an effective and potential thermal recovery method for heavy crude oil, in situ combustion (ISC) technology has been increasingly studied. , During the dynamic ISC process, a series of continuous and complex reactions, such as distillation volatilization, low-temperature oxidation (LTO), fuel deposition (FD), and high-temperature combustion (HTC), are generally believed to occur. − Oxygen addition reactions of some active aliphatic compounds are regarded as the main LTO reaction pathways that produce LTO derivatives. , Then, the coke precursors can further generate coke in the FD stage. − The available heat is released by coke combustion, which can promote the in situ cracking and upgrading of heavy oil. , These newly produced light fractions can be distilled into the gas phase and further migrate and condense. , Additionally, the injected gas results in increasing the reservoir pressure and enhancing crude oil recovery. , …”

Section: Introductionmentioning

confidence: 99%

Exothermal Property and Kinetics Analysis of Oxidized Coke and Pyrolyzed Coke from Fengcheng Extra-Heavy Oil

Wang

et al. 2021

Ind. Eng. Chem. Res.

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The exothermic combustion characteristics of coke play a direct and essential role in artificial ignition and the stability of the combustion front during the heavy oil in situ combustion (ISC) process. However, there is little research on the exothermal properties of pure oxidized coke and pyrolyzed coke. Oxidized coke and pyrolyzed coke formed by Fengcheng (FC) extra-heavy oil in an air or nitrogen atmosphere is studied in this work to obtain the exothermal behavior of different coke utilizing TG and DSC. The kinetics of both cokes are analyzed by the Friedman and Ozawa–Flynn–Wall methods. The morphological structures and main elemental distribution of each coke are identified by SEM and EDS. Results show that oxidized coke can release more heat than pyrolyzed coke. The whole enthalpy values of oxidized coke are 25.804 kJ/g (300 °C) and 28.717 kJ/g (350 °C), which are greater than those of pyrolyzed coke (18.325 kJ/g and 25.617 kJ/g). The activation energy curves of 300 °C coke fluctuate dramatically with the conversion rates, but 350 °C coke only changes slightly. The 350 °C pyrolyzed coke has much more combustion reactivity followed by the 350 °C oxidized coke. Compared with other coke, the 350 °C pyrolyzed coke has a more obvious porous structure with a regular arrangement and has the highest relative percentage of C, which is inconsistent with its higher reactivity. Combined with the research results, we show that preheating FC heavy oil fields to 350 °C with air injection is an effective method to ensure the successful application of ISC technology and to improve oil reservoir recovery.

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Contribution of thermal analysis and kinetics of Siberian and Tatarstan regions crude oils for in situ combustion process

Cited by 41 publications

References 13 publications

Native Vanadyl Complexes in Crude Oil as Polarizing Agents for In Situ Proton Dynamic Nuclear Polarization

Native Vanadyl Complexes in Crude Oil as Polarizing Agents for In Situ Proton Dynamic Nuclear Polarization

Influence of Hydrothermal and Pyrolysis Processes on the Transformation of Organic Matter of Dense Low-Permeability Rocks from Domanic Formations of the Romashkino Oil Field

Exothermal Property and Kinetics Analysis of Oxidized Coke and Pyrolyzed Coke from Fengcheng Extra-Heavy Oil

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