Recently, there has been a closer attention of the scientific community to gas-enhanced methods of increasing oil recovery (EOR) which is primarily due to the need to increase the oil recovery at brown fields, to practice rational use of petroleum gas, and to reduce carbon dioxide emissions. In addition, gas EOR projects can at the same time represent very promising and potential methods of extracting hard-to-recover reserves (low-permeable and low-productive reservoirs, highly-viscous oil reservoirs, etc.). Currently many oil and gas companies are conducting scientific research to evaluate the performance of such projects. The main challenge is the development of scientifically based approaches to assessing the performance of gas EOR projects and selecting appropriate subsurface targets. A key and significant stage of the scientific research is laboratory testing which allows to study the physical processes occurring in a reservoir system, to capture the oil recovery mechanisms, and to obtain experimental data necessary to build compositional models to perform further feasibility study of projects.
The article describes the methodology and laboratory and methodological base for conducting comprehensive experimental studies within scientific support of gas EOR projects, as well as the results of studies of petroleum gas performance to increase oil recovery from one of the East Siberian fields. The methodology of laboratory research provides for the sequential execution of the following set of activities: making up and measuring the properties of core and reservoir fluids, making up recombined fluid samples, running routine and special set of PVT studies, evaluating parameters of interaction of reservoir fluids and a gas agent, running core flow studies, assessing risks and negative factors during gas injection, performing flow simulation runs on linear reservoir models. The main purpose of laboratory studies is an early assessment of petroleum gas performance to increase oil recovery of a particular reservoir and to obtain the necessary input data for further scaling-up and making a feasibility study of an EOR project. The comprehensive studies have confirmed the high potential of gas agents for the reservoir under study. The proposed comprehensive studies methodology will be rolled out within the perimeter of the Tyumen Petroleum Research Center with scientific support of gas EOR projects.
References
1. Grushevenko E., Kapitonov S., Mel'nikov Yu. Et al., Dekarbonizatsiya v neftegazovoy otrasli: mezhdunarodnyy opyt i prioritety Rossii (Decarbonization in the oil and gas industry: international experience and Russian priorities): edited by Mitrova T., Gayda I., Moscow: Publ. of the Low-carbon and circular economy Lab, 2021, 158 p., URL: https://energy.skolkovo.ru/downloads/documents/SEneC/Research/SKOLKOVO_EneC_Decarbonization_of_oil_a...
2. Eder L.V., Provornaya I.V., Filimonova I.V., The recovery and utilization of associated petroleum gas as the direction of comprehensive exploitation of mineral resources: The role of the state and business, technology and ecological limit (In Russ.), Burenie i neft', 2016, no. 10, pp. 8–15.
3. Balint V., Ban A., Doleshan Sh., Primenenie uglekislogo gaza v dobyche nefti (The use of carbon dioxide in oil production), Moscow: Nedra Publ., 1977, 240 p.
4. Ryazantsev M.V., Lozin E.V., Carbon dioxide flooding: history of world and local investigations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 7, pp. 100-103,
DOI: https://doi.org/10.24887/0028-2448-2020-7-100-103
5. Surguchev M.L., Vtorichnye i tretichnye metody uvelicheniya nefteotdachi plastov (Secondary and tertiary methods of enhanced oil recovery), Moscow: Nedra Publ., 1985, 308 p.
6. Surguchev M.L., Gorbunov A.T., Zabrodin D.P. et al., Metody izvlecheniya ostatochnoy nefti (Residual oil recovery methods), Moscow: Nedra Publ., 1991, 347 p.
7. Stepanova G.S., Gazovye i vodogazovye metody vozdeystviya na neftyanye plasty (Gas and water-gas methods of influence in oil reservoirs), Moscow: Gazoil press, 2006, 200 p.
8. Vashurkin A.I. et al., Ispytaniya tekhnologiy gazovogo i vodogazovogo vozdeystviya na Samotlorskom mestorozhdenii (Testing of gas and water-gas stimulation technologies at the Samotlor field), Moscow: Publ. of VNIIOENG, 1989, 37 p.
9. Afonin D.G., Levagin S.A., Morozovskiy N.A. et al., System approach to ranking potential objects for applying gas methods of enhanced oil recovery (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 10, pp. 69-75, DOI: https://doi.org/10.24887/0028-2448-2021-10-69-75
10. Arzhilovskiy A.V., Afonin D.G., Ruchkin A.A. et al., Express assessment of the increase in the oil recovery as a result of water-alternating-gas technology application (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2022, no. 9, pp. 63-67, DOI: https://doi.org/10.24887/0028-2448-2022-9-63-67
11. Zakharenko V.A., Kobyashev A.V., Pyatkov A.A. et al., Efficiency of water-alternating-gas process in water-wet and oil-wet reservoirs by results of core flooding experiments on long core samples (In Russ.), Neftyanaya provintsiya, 2021, no. 4, pp. 136-154, DOI: https://doi.org/10.25689/NP.2021.4.136-154
12. Kobyashev A.V., Zakharenko V.A., Pyatkov A.A. et al., Comparison of efficiency of different agents of influence (water, water-gas impact) under geological conditions of the cavernous-porous reservoir of B5 formation of the North Danilovskoe field by the data obtained during laboratory experiments (In Russ.), Neftepromyslovoe delo, 2021, no. 10, pp. 14-22, DOI: https://doi.org/10.33285/0207-2351-2021-10(634)-14-22
13. Morozyuk O.A., Barkovskiy N.N., Kalinin S.A. et al., Experimental study of heavy oil displacement by carbon dioxide from carbonate rocks (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2019, no. 6, pp. 51–56, DOI: https://doi.org/10.30713/2413-5011-2019-6(330)-51-56
14. Kalinin S.A., Morozyuk O.A., Laboratory studies of carbonate reservoirs in high-viscosity oil fields using carbon dioxide (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2020, V. 20, no. 4, pp. 369-385,
DOI: https://doi.org/10.15593/2712-8008/2020.4.6
15. Morozyuk O.A., Kalinin S.A., Kalinin S.A. et al., Estimation of the influence of associated petroleum gas with a high carbon dioxide content on the oil displacement regime in the development of the Tolumskoye field (In Russ.), Nedropol'zovanie, 2021, V. 21, no. 1, pp. 42-48, DOI: https://doi.org/10.15593/2712-8008/2021.1.7
16. Mardamshin R.R., Sten'kin A.V., Kalinin S.A. et al., Laboratory investigations of using high CO2 associated petroleum gas for injection at the Tolum field (In Russ.), Nedropol'zovanie, 2021, V. 21, no. 4, pp. 163-170, DOI: https://doi.org/10.15593/2712-8008/2021.4.3
17. Shung F.T.H., Jones R.A., Nguyen H.T., Measurements and correlations of the physical properties of CO2/Heavy-crude-oil mixtures, SPE-15080-PA, 1988,
DOI: https://doi.org/10.2118/15080-PA
18. Wu R.S., Batycky J.P., Evaluation of miscibility from slim tube tests, The Journal of Canadian Petroleum Technology, 1990, V. 29, no. 6, pp. 63–70, DOI: https://doi.org/10.2118/90-06-06
19. Farouq Ali S.M., Thomas S., Steam and CO2 combination flooding of fractured cores: Experimental Studies, PETSOC-95-80, 1995, DOI: https://doi.org/10.2118/95-80
20. Rao D.N., Lee J.I., Evaluation of minimum miscibility pressure and composition for Terra Nova offshore project using the new vanishing interfacial tension technique, SPE-59338-MS, 2000, DOI: https://doi.org/10.2118/59338-MS
21. Zhang Yunjun, Shen Dehuang, Gao Yongrong et al., Physical simulation experiments on CO2 injection technology during steam assisted gravity drainage process, Acta Petrolei Sinica, 2014, V. 35, no. 6, pp. 1147–1152, DOI: http://doi.org/10.7623/syxb201406012
22. Lyan Men, Fizicheskoe modelirovanie vytesneniya nefti gazom (rastvoritelem) s ispol'zovaniem kernovykh modeley plasta i slim tube (Physical modeling of oil displacement by gas (solvent) using reservoir core models and slim tube): thesis of candidate of technical science, Moscow, 2017.
23. Petrakov A.M., Egorov Yu.A., Lebedev I.A. et al., Gas and WAG methods for oil recovery Methodological principals of the laboratory study (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 2, pp. 60–63.
24. Sabanchin I.V., Titov R.V., Petrakov A.M. et al., Physical simulation of gas injection at oil-gas-condensate fields of Eastern Siberia (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 6, pp. 92–96, DOI: https://doi.org/10.24887/0028-2448-2017-6-92-97
25. Kalinin S.A., Povyshenie effektivnosti izvlecheniya sverkhvyazkoy nefti putem vozdeystviya na plast teplonositelem i dioksidom ugleroda (Increasing the efficiency of extra-viscous oil extraction by exposing the formation to coolant and carbon dioxide): thesis of candidate of technical science, Perm, 2022.