Experimental methods for studying the wetting properties of oil reservoirs: a review

Ivanova, Anastasia A.; Mitiurev, Nikolai; Шилобреева, С. Н.

doi:10.31857/s0002-333720193135-149

Физика Земли

2019

DOI: 10.31857/s0002-333720193135-149

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Experimental methods for studying the wetting properties of oil reservoirs: a review

Anastasia A. Ivanova

Nikolai Mitiurev

С. Н. Шилобреева

Abstract: The theoretical principles of the laboratory methods for studying the wettability of unconventional oil formation rocks are discussed and examples of their practical implementation are presented. The comparative analysis of the advantages and disadvantages of each method is presented. It is shown that despite the recent progress in the development of methods for determining the wettability of rocks, they still need to be improved. Examples of their possible improvements are discussed.

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Cited by 2 publications

References 11 publications

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Potential for improving the efficiency of carbonate oil deposits waterflooding with the use of controlled salinity technology (Smart water) at fields of Tatarstan Republic

Saptarova,

Mamonov,

Usmanov

et al. 2023

Georesursy

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The article provides an overview of ion-modified waterflooding technology, also known as low salinity, controlled salinity, or Smart water. This technology is currently considered one of the most promising approaches in the development of oil deposits in carbonate reservoirs due to its economic efficiency and environmental safety. The article discusses the main mechanisms and processes underlying ion-modified waterflooding and presents the results of laboratory studies conducted on core samples from foreign oil deposits. It includes an analysis of several studies, including contact angle measurements and core flooding experiments on core samples from oil deposits in carbonate reservoirs on the eastern side of the Melekess depression in the Republic of Tatarstan. It is important to note that the Vereyian deposits explored in this article are not a typical example of test objects for ion-modified water injection. This is because they are characterized by a low reservoir temperature of 23 °C, which suggests that the efficiency of the technology would likely be lower compared to studies conducted abroad, where reservoir temperatures were significantly higher. For example, Darvish Sarvestani et al. studied reservoir conditions at 90 °C, Yousef et al. – reservoir temperature of 100 °C, and Austad et al. examined the Ekofisk field at 130 °C and the Volhall field at 90 °C in Norway. However, as several studies have indicated, prolonged contact between rock samples and ion-modified water contributes to significant hydrophilization of the rock surface, as confirmed by contact angle measurements. The contact angle decreases from approximately 138.3° to 53.45° after exposure to ion-modified water. Additionally, the core flooding experiment demonstrated a slight increase in the oil displacement coefficient, reaching 9.2%. These findings suggest the potential for enhanced oil recovery by injecting Smart water into the Vereyian sediments, although further research is required to confirm the underlying mechanism.

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Potential for improving the efficiency of carbonate oil deposits waterflooding with the use of controlled salinity technology (Smart water) at fields of Tatarstan Republic

Saptarova,

Mamonov,

Usmanov

et al. 2023

Georesursy

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Wettability of organic-rich source rocks: case study on Bazhenov Formation (Abalak-Bazhenov group)

et al. 2020

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Abstract. In this work, we have investigated the wettability of Bazhenov Formation rock samples using a nuclear magnetic resonance (NMR), the methods of vapor adsorption, and wetting contact angle. We have conducted the petrographic description of rocks using ultra-thin sections and scanning electron microscopy (SEM). In addition, we used data on the organic content (TOC) obtained by the Rock-Eval method and the results of lithological typing on thin sections for detailed analysis of NMR and contact angle methods results. Thus, for target rock, the groups with a similar rock wettability were highlighted by the lithological description of thin sections. The calculation of the wetting angle provided an initial assessment of the surface wettability of the rock and made it possible to establish the relationship between the wetting angle and the TOC, which is relevant for rocks of the Abalak-Bazhenov group. The NMR method described the core plug wettability proved to be less sensitive to the rock lithotype and organic matter (OM) texture in the rock and, therefore, used for the integral characterization of core plugs. Correlations of calculated wetting angle and adsorption wettability index vs. TOC and OM texture illustrated the dependence of rock wettability behavior on both the lithological specifics and the OM properties.

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Experimental methods for studying the wetting properties of oil reservoirs: a review

Cited by 2 publications

References 11 publications

Potential for improving the efficiency of carbonate oil deposits waterflooding with the use of controlled salinity technology (Smart water) at fields of Tatarstan Republic

Potential for improving the efficiency of carbonate oil deposits waterflooding with the use of controlled salinity technology (Smart water) at fields of Tatarstan Republic

Wettability of organic-rich source rocks: case study on Bazhenov Formation (Abalak-Bazhenov group)

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