Rosneft Oil Company has been involved in the development and operation of reservoirs with a complex structure, which significantly hinders the reliability of the assessment of the wettability index of these development facilities. Wettability is one of the most important characteristics of reservoir rocks. A large number of different methods and techniques for determining this parameter have been developed, which have both their pros and cons. The use of standard research methods has certain difficulties and limitations; and in extreme cases it is completely impossible to use them in the study, for example in case of highly clayey and weakly consolidated rocks. It is obvious that the process of studying the core of complex terrigenous reservoirs faces certain difficulties, the impact of which can be reduced by using the method of nuclear magnetic resonance (NMR).
The article considers the method of NMR relaxometry on the example of weakly consolidated terrigenous rocks with low permeability (less than 0.001 μm) and high content of clay components. The method is introduced in NK Rosneft - NTC LLC (a subsidiary of Rosneft Oil Company). The obtained results were compared with the data measured by the direct method of determining the edge angle of wettability (the recumbent drop method) and the indirect centrifuge Tulbovich method. A good qualitative and quantitative convergence of the results of NMR relaxometry and the results of a direct study of the contact angle is shown. At the same time, there are significant discrepancies both at the qualitative and quantitative levels with the data obtained by the Tulbovich method, which is due to the limitations of this method. In the laboratory complex of NK Rosneft - NTC LLC" (a subsidiary of Rosneft Oil Company) a methodology for assessing wettability by NMR-relaxometry is reviewed and implemented.
References
1. Tul’bovich B.I., Metody izucheniya porod-kollektorov nefti i gaza (Methods of study of oil and gas reservoir rocks), Moscow, Nedra Publ., 1979, 199 p.
2. Borisenko S.A., Bogdanovich N.N., Kozlova E.V. et al., Estimating lyophilic properties of the Bazhenov formation rocks by adsorption and NMR methods (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 3, pp. 12-16, DOI: https://doi.org/10.24887/0028-2448-2017-3-12-16
3. Shumskayte M.Y., Opredelenie petrofizicheskikh parametrov peschano-glinistykh obraztsov kerna i tipizatsiya plastovykh flyuidov metodom YaMR-relaksometrii (Determination of petrophysical parameters of sandy-clayey core samples and typification of formation fluids by NMR-relaxometry): thesis of candidate of technical science, Novosibirsk, 2017.
4. Churkov A.V., Rogozin A.A., Yatsenko V.M., Ignat’eva T.S., Rapid assessment of clay content based on NMR-relaxometry results (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 9, pp. 93–95, DOI: https://doi.org/10.24887/0028-2448-2020-9-93-95
5. Rogozin A.A., Ignat’eva T.S., Churkov A.V., Integration of nmr relaxometry data and electrometric studies on the example of reservoir rocks of deposits of the Timan-Pechora oil and gas province (In Russ.), Ekspozitsiya Neft’ Gaz, 2021, no. 12, pp. 62-66, DOI: https://doi.org/10.24412/2076-6785-2021-6-62-66
