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26. Selection of optimal EOR for extra-heavy crude oil displacement from low-permeability reservoirs.

Author

Derevyanko, V. K., Bolotov, A. V., Minkhanov, I. F., and Varfolomeev, M. A.

Subjects
HEAVY oil, PETROLEUM, THERMAL oil recovery, HEAT treatment, HOT water, OIL fields
Abstract

The rapid decline in the number of conventional oil fields has been a global problem in recent decades, making the development of hard-to-recover reserves of heavy oil a priority task. Currently, the main methods that are being used for heavy oil recovery are thermal methods, such as injection of hot water, steam flooding, steam-assisted gravity drainage (SAGD), cyclic steam stimulation (CSS), and in-situ combustion (ISC). It is essential to select an efficient technology for the additional oil recovery after a prolonged interaction between the hot agent and the rock. An alternative method to increase oil recovery after heat treatment is a solvent injection, which aims to dissolve high molecular weight components and increase oil flowability. The main purpose of the study was to select the optimal sequential combination of thermal and non-thermal EOR for the maximum possible recovery of extra-heavy crude oil (EHCO). The effectiveness of the technology was assessed using 1-D physical modeling of the oil displacement process on a core model under reservoir conditions and subsequent analysis of the displaced fluid. The experiment was took place in several consecutive stages: injection of hot water, injection of steam, and additional oil displacement by injection of the solvent slug and water. The exposure of thermal methods reduced oil viscosity by 23 times and achieved an oil recovery factor (RF) of 40.2 %. Consecutive injection of solvent slug and water at the final stage allowed significantly increasing the RF by 38.5 % and reduces the content of high-molecular weight components. According to the results of the filtration experiment gas permeability of the core model increased by 9.5 times. Thus, the results obtained provide important information to evaluate the application of different EOR on fields with EHCO and confirm the possibility of achieving a high oil RF (78.6 %) with proper project design. [ABSTRACT FROM AUTHOR]

Published
2023
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35. NMR STRUCTURAL-GROUP CHARACTERISTICS AND DETAILED SHIFT RANGES IN LIGHT, HEAVY AND CATALYZED OILS

Author

Rakhmatullin, I., Efimov, S., Klochkov, A., Klochkov, V., and Varfolomeev, M.

Subjects
13C NMR spectroscopy, heavy oil, oil fraction, functional group, qualitative analysis, quantitative composition, aromaticity, attached proton test, gated decoupling
Abstract

Application of high resolution 13C nuclear magnetic resonance (NMR) spectroscopy to characterize of light, heavy and catalyzed oils was demonstrated. Molar fractions of primary, secondary, quaternary, tertiary, aromatic groups, aromatic factor and average hydrocarbon chain length of aliphatic hydrocarbons of these oil samples according to 13C NMR spectra were determined. The received parameters indicate about the success of the catalytic treatment of the studied heavy oil sample. The detailed assignment of the 13C NMR signals and their comparison between light, heavy and catalyzed oil samples were carried out. Changes in the chemical shifts of the 13C NMR signals upon a detailed study of the spectra also confirm the positive effect of catalytic treatment of studied sample.

Published
2022
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37. On the use of metallic nanoparticulated catalysts for in-situ oil upgrading

Author

Russian Science Foundation, Simão, A., Domínguez-Álvarez, Enrique, Yuan, C., Suwaid, M. A., Varfolomeev, M. A., Ancheyta, J., Al-mishaal, O. F., Kudryashov, S. I., Afanasiev, I. S., Antonenko, D. A., Russian Science Foundation, Simão, A., Domínguez-Álvarez, Enrique, Yuan, C., Suwaid, M. A., Varfolomeev, M. A., Ancheyta, J., Al-mishaal, O. F., Kudryashov, S. I., Afanasiev, I. S., and Antonenko, D. A.

Abstract

An exhaustive review on the application of different metal-based nanoparticles for the upgrading of heavy oils has been performed. Particular emphasis has been put on those catalysts used for in-situ upgrading using various thermal treatment methods aiming at extracting heavy oils in a more effective manner. Different types of catalysts have been identified, such as monometallic (Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Mo, Ce, and W), non-supported bimetallic (Ti/Zr), non-supported polymetallic (various mixtures of Co, Mo, Ni, W, Al, Zn, Cu), and supported (various metals on silica, alumina, carbon, zeolite, biogenic particles, complex inorganic and organic). Due to the great diversity of nanoparticulated catalysts (type, metal content, synthesis procedure, particle size) and evaluation conditions (experimental setup, reaction conditions, type of feed), it is not possible to make a direct comparison on their performance. Some results are highlighted on the effectiveness of the catalysts for heavy oil upgrading in terms of asphaltene adsorption, viscosity reduction, increase of API gravity, and coke formation. The reviewed literature indicates the need for more research on this topic as to develop more effective catalysts not only for increasing the recovery factor but also for permanent upgrading of the quality of heavy and extra-heavy oil.

Published
2022

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