Variations in in-situ combustion performance due to fracture orientation

Александров, Д. Ю.; Kudryavtsev, P. I.; Hasçakir, Berna

doi:10.1016/j.petrol.2017.02.002

Cited by 31 publications

(12 citation statements)

References 25 publications

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“…In situ combustion (ISC) is a quite promising, green, and economical thermal enhanced oil recovery (EOR) technique in which energy is generated by a combustion front that is propagated along the reservoir, and it is suitable for the development of unconventional heavy crude oil reservoirs. − …”

Section: Introductionmentioning

confidence: 99%

¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

Pan

Liao²,

et al. 2021

ACS Omega

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Petroleum cokes with different chemical structures and oxygen-containing functional groups were obtained from two kinds of naphthenic- and paraffin-base crude oils by simulating an in situ combustion (ISC) process with the same reaction atmosphere and different reaction temperatures. 13 C wide-cavity solid-state nuclear magnetic resonance ( 13 C NMR) spectroscopy was used to identify and investigate the oxygen-containing functional groups of petroleum cokes obtained under different compositions and reaction temperatures. This study demonstrated that with the increase of coking temperature, the content of alkyl side chain and active oxygen-containing functional groups in naphthenic-base crude coke decreased obviously, while the content of aromatic carbon increased. The 13 C NMR analysis of the two kinds of petroleum cokes obtained at 500 °C further revealed that the paraffin-base petroleum coke retained a high content of oxygen- and nitrogen-rich functional groups, while the naphthenic-base petroleum coke had a lower amount of carbonyl groups and oxygen-containing functional groups.

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Section: Introductionmentioning

confidence: 99%

¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

Pan

Liao²,

et al. 2021

ACS Omega

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“…In situ combustion (ISC) can reduce the viscosity of heavy oil through the heat generated at the combustion front and make it flow to the production well. Heat is formed and maintained by injecting air or oxygen enriched under high temperature and pressure and burning deposited fuel (Aleksandrov et al 2017). During the combustion process, the heat generated promotes the thermal cracking reaction, thereby increasing the proportion of low molecular weight compounds.…”

Section: In-situ Oil Recoverymentioning

confidence: 99%

A review of development methods and EOR technologies for carbonate reservoirs

et al. 2020

Pet. Sci.

178

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Carbonate reservoirs worldwide are complex in structure, diverse in form, and highly heterogeneous. Based on these characteristics, the reservoir stimulation technologies and fluid flow characteristics of carbonate reservoirs are briefly described in this study. The development methods and EOR technologies of carbonate reservoirs are systematically summarized, the relevant mechanisms are analyzed, and the application status of oil fields is catalogued. The challenges in the development of carbonate reservoirs are discussed, and future research directions are explored. In the current development processes of carbonate reservoirs, water flooding and gas flooding remain the primary means but are often prone to channeling problems. Chemical flooding is an effective method of tertiary oil recovery, but the harsh formation conditions require high-performance chemical agents. The application of emerging technologies can enhance the oil recovery efficiency and environmental friendliness to a certain extent, which is welcome in hard-to-recover areas such as heavy oil reservoirs, but the economic cost is often high. In future research on EOR technologies, flow field control and flow channel plugging will be the potential directions of traditional development methods, and the application of nanoparticles will revolutionize the chemical EOR methods. On the basis of diversified reservoir stimulation, combined with a variety of modern data processing schemes, multichannel EOR technologies are being developed to realize the systematic, intelligent, and cost-effective development of carbonate reservoirs.

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“…The gas produced in the experiment with the high-viscosity oil had a higher CO 2 concentration and lower O 2 and CO concentrations. The difference in the produced gas may not be as obvious in oilfields due to the long distance between the injection well and production wells [21][22][23]. However, the O 2 content will always remain within a safe range if combustion can be maintained.…”

Section: Gasmentioning

confidence: 99%

Study of Displacement Characteristics of Fire Flooding in Different Viscosity Heavy Oil Reservoirs

Liu¹,

Liu²,

Zhao

et al. 2021

Geofluids

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A field test in the Xinjiang oilfield in China shows that the viscosity of heavy oil has a certain influence on the combustion dynamics and injection-production performance of fire flooding. The experiment in this study uses a one-dimensional combustion tube to study the temperature, gas composition, and air injection pressure and the production performance of the fire flooding of heavy oil with different viscosities. The results show that the oil viscosities of 1180–22500 mPa·s can achieve stable combustion, and the O2 content of the gas produced during the stable combustion stage is <0.5%. The higher the viscosity of the heavy oil, the higher the temperature in the burned zone and the smaller the range of the temperature increase in the unburned zone. The air injection pressure will increase rapidly until a stable seepage channel is formed, and then, it will drop to a level close to the formation pressure. High-viscosity heavy oil requires a higher air injection pressure and will remain in the high-pressure stage for a longer period of time. Low-viscosity heavy oil has a low water cut in the early stage of fire flooding, a large oil production rate, and a low and stable air–oil ratio. The water cut of high-viscosity heavy oil increases rapidly in the early stage of fire flooding and then decreases gradually, so a good air–oil ratio can only be obtained in the middle and late stages of fire flooding. Thus, fire flooding may be more suitable for application in common heavy oil and some extra heavy oil reservoirs with lower viscosities.

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Variations in in-situ combustion performance due to fracture orientation

Cited by 31 publications

References 25 publications

¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

A review of development methods and EOR technologies for carbonate reservoirs

Study of Displacement Characteristics of Fire Flooding in Different Viscosity Heavy Oil Reservoirs

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Variations in in-situ combustion performance due to fracture orientation

Cited by 31 publications

References 25 publications

13C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

13C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

A review of development methods and EOR technologies for carbonate reservoirs

Study of Displacement Characteristics of Fire Flooding in Different Viscosity Heavy Oil Reservoirs

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Product

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¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions

¹³C Solid-State NMR Analysis of the Chemical Structure in Petroleum Coke during Idealized In Situ Combustion Conditions