Estimating the effect of permeability variability of undersaturated oil reservoirs on the change in the start water-cut of well production

The development of undersaturated oil layered heterogeneous oil reservoirs against the background of a general depletion of oil reserves is becoming increasingly interesting. The development of these hard-to-recover oil reserves is associated with non-standard changes and increased water-cut in wells. An undersaturated (unformed, young) reservoir is a conditionally large transitional water-oil zone of the reservoir, in its classical sense. It is assumed that, since the initial oil saturation of the formation is low, and the water saturation is correspondingly high, the starting water cut should correspond to this ratio, but this is not so in some cases. At the same time, it is difficult to say in advance whether water-cut will increase, stabilize or fall in the first months. The study is aimed at identifying the determining parameter and the ranges of its change by statistical methods, based on which it will be possible to predict with high probability the nature of the change in water cut during the feasibility study for drilling new wells. For the conditions of the selected object, a graphical dependence of the water cut deviation in the initial period of well operation from layered heterogeneity of the reservoir is found. The results of the study are the rationale for creating new technologies for the selective isolation of oil-layers. It should to allow reversibly limiting the permeability of the low-permeability low-saturated part of the reservoir. Most of the existing technologies are aimed at the selective isolation of high-permeability and watered layers.

1. Gafarov, Sh. A., & Lysenkov, A. V. (2008). Fizika plasta. Ufa, Monografiya Publ., 223 p. (In Russian).

2. Fattakhov, I. G. (2001). The identification technique of oil well water invasion ways. Oil and Gas Business, (3), pp. 160-164. (In English). Available at: http://ogbus.ru/files/ogbus/eng/authors/FattakhovIG/FattakhovIG_1e.pdf

3. Zeygman, Yu. V., Vasil'ev, V. I., Oblekov, G. I., & Demin, V. M. (1998). Dinamika pereraspredeleniya nefti i vody v prizaboynoy zone plasta. Ufa, Fond sodeystviya razvitiyu nauchnykh issledovaniy Publ., 96 p. (In English).

4. Bagramov, K. A., D'yachuk, I. A., Lutsenko, A. A., Repin, D. N., Tyan, N. S., & Khasanov, M. M. Sposob snizheniya obvodnennosti produktsii neftyanykh dobyvayushchikh skvazhin. Pat. 2161246 RF. № 99111569/03. Applied: 01.06.1999. Published: 27.12.2000, Byul. № 35, 2 p. (In Russian).

5. Sagitov, D. K. (2005). Nakoplenie "vizual'nogo opyta" s tsel'yu dal'neyshego prognozirovaniya protsessa obvodneniya skvazhin na osnove statisticheskogo modelirovaniya. Oilfield Engineering, (12), pp. 30-35. (In Russian).

6. Abdulmyanov, S. Kh., Sagitov, D. K., Safiullin, I. R., & Astakhova, A. N. (2012). Frequency analysis of adjoining wells interference causing change of volumes of water injecting and product water-flooding performed on the basis of operational history. Oilfield Engineering, (11), pp. 20-24. (In Russian).

7. Sagitov, D. K., Saflullin, I. R., Lepikhin, V. A., & Arzhilovsky, A. V. (2012). Assessment of cross impact of production and injection wells with the help of application of method of pattern recognition by history of their operation. Oilfield Engineering, (1), pp. 35-36. (In Russian).

8. Vladimirov, I. V., Almuhametova, E. M., & Veliyev E. M. (2016). Conditions of the effective use of hot water flooding for development of heavy oil deposits with non-uniform permeability. Oil Industry, (9), pp. 62-65. (In Russian).

9. Abyzbaev, I. I., & Andreev, V. E. (2005). Prognosis of the physical and chemical method to increase flooding efficiency, Neftegazovoye delo, (3), pp. 167-176. (In Russian).

10. Vafin, R. V., Zaripov, M. S., Taziev, M. M., Chukashev, V. N., Butorin, O. I., Vladimirov, I. V., & Sagitov, D. K. (2005). Vodogazovoe vozdeystvie - perspektivnyy metod uvelicheniya nefteotdachi mestorozhdeniy s karbonatnymi kollektorami. Oilfield Engineering, (1), pp. 38-42. (In Russian).

11. Gil'mutdinova, L. I., Voloshin, A. I., Shadrina, P. N., Komkov, A. A., Folomeev, A. E., & Lenchenkova, L. E. (2017). Issledovanie sovmestimosti plastovykh flyuidov i rabochikh agentov dlya predotvrashcheniya oslozhneniy pri kislotnykh obrabotkakh v usloviyakh Mogdinskogo mestorozhdeniya. Innovatsii i naukoemkie tekhnologii v obrazovanii i ekonomike. Materialy VI Mezhdunarodnoy nauchno-prakticheskoy konferentsii, pp. 118-126. (In Russian).

12. Folomeev, А. Е., Vakhrushev, S. A., Sharifullin, A. R., Lenсhenkova, L. E., Nabiullin, R. M., & Fedorov, A. I. (2014). Integrated approach to well acidizing design on R.Trebs oil field (Timan-Pechora Basin). Oil Industry, (8), pp. 72-75. (In Russian).

13. Proskurin, V. A., Khisamutdinov, N. I., Antonov, M. S., & Sagitov, D. K. (2013). Some techniques applied for assessment of water-flooding system efficiency and formation at one of the objects of Western Ust-Balyk field. Automation, telemechanization and communication in the oil industry, (6), pp. 36-38. (In Russian).

14. Sagitov, D. K., Khalzov, A. A., & Lepikhin, V. A. (2012). Prompt correction of compensation of liquid removals by means of water injection in oil fields. Oilfield Engineering, (1), pp. 26-28. (In Russian).

15. Sarvaretdinov, R. G., & Sagitov, D. K. (2008). Ispol'zovanie geologo-matematicheskoy modeli plasta pri sopostavlenii srednikh znacheniy poristosti i pronitsaemosti razlichnykh po neodnorodnosti plastov. Automation, telemechanization and communication in the oil industry, (10), pp. 15-20. (In Russian).

16. Hisamutdinov, N. I., Vladimlrov, I. V., Sagltov, O. K., & Abdulmyanov, S. H. (2010). Modeling of oil recovery from anisotropic layer under various regimes of deposit (CO) development. Geology, Geophysics and Development of Oil and Gas Fields, (1), pp. 5-7. (In Russian).

17. Khisamutdinov, N. I., Sagitov, D. K., Shaislamov, V. Sh., & Listik, A. R. (2012). Classification of deposits' sectors for geological bodies in formations' deformed structures and standardization of schemes of wells' placement for hydrodynamic modeling. Geology, Geophysics and Development of Oil and Gas Fields, (6), pp. 54-59. (In Russian).

18. Bakhtizin, R. N., & Fattakhov, I. G. (2011). Regulation ranks of associated water production decrease. Neftegazovoye delo, (5), pp. 203-219. (In English). Available at: https://elibrary.ru/item.asp?id=17998419

19. Nigmatullin, E. N., Akchurin, Kh. I., & Lenchenkova, L. E. (2012). The explanation mechanism of gelation in sodium polysilicate solutions ith acids effect study. Neftegazovoye delo, (3), pp. 375-383. (In Russian).

20. Khisamutdinov, N. I., Vladimirov, I. V., Taziev, M. M., Sagitov, D. K., Alekseev, D. L., & Butorin O. I. Sposob dobychi nefti na pozdney stadii razrabotki neftyanoy zalezhi, podstilaemoy vodoy. Pat. 2299977 RF, MPK E 21 V 43/16. № 2005102581/03. Applied: 03.02.2005. Published: 27.05.2007, Byul. № 15. (In Russian).

21. Lenchenkova, L. E., Luk'yanova, N. Yu., Mukhametzyanova, R. S., Ganiev, R. R., & Fakhretdinov, R. N. (1998). Izuchenie fiziko-khimicheskikh svoystv geleobrazuyushchey sistemy na osnove alyumosilikatov. Razrabotka i sovershenstvovanie metodov uvelicheniya nefteotdachi trudnoizvlekaemykh zapasov, Ufa, Gilem Publ., pp. 192-195. (In Russian).

22. Merzlyakov, V. F., Nosachev, A. A., Andreev, V. E., Kotenev, Yu. A., & Khayredinov, N. Sh. (1998). Geologo-tekhnologicheskie osobennosti razrabotki neftyanykh mestorozhdeniy yugo-zapada Bashkortostana. Moscow, VNIIOENG JSC Publ., 150 p. (In Russian).

23. Ponomarev, A. I., Denislamov, I. Z., Vladimirov, I. V., Mindiyarov, F. F., & Shayakhmetov A. I. (2017). Multifunctional wells for high-viscous deposits development. Oilfield Engineering, (8), pp. 20-24. (In Russian).

24. Hafizov, A. R., Tchizhov, A. P., Chibisov, A. V., Orlоwski, S. L., & Popov, S. A. (2011). Complex technologies of influence on gravely extracted аnd residual stocks of oil. Neftegazovoye delo, 9(3), pp. 40-44. (In Russian).

25. Kotenev, Yu. A., Kazhdan, M. V., Sultanov, Sh. Kh., & Dulkarnaev, M. R. (2013). Utochnenie trekhmernoy geologicheskoy modeli plasta AV1-2 Vat'eganskogo neftyanogo mestorozhdeniya v predelakh ob"ekta issledovaniya. Neftegazovye tekhnologii i novye materialy. Problemy i resheniya. Ufa, pp. 199-204. (In Russian).

26. Lesnoy, A. N., Bochkarev, A. V., Bronskova, E. I., Kalugin, A. A., & Vyatchinin, M. M. (2016). Zoning change of rocks’ characteristics of Vategansky field on the basis of core study results. Geology, Geophysics and Development of Oil and Gas Fields, (1), pp. 22-28. (In Russian).

27. Alekseev, A. S. (2019). Evaluation of Sensitivity of the AV1-3 Vatyeganskoye Oil Field to Changes in the System of Reservoir Pressure Maintenance on the Basis of Retrospective Analysis. Science and Business: Ways of Development, (6(96)), pp. 18-21. (In Russian).

28. Karimov, R. M. (2002). Vliyanie osobennostey geologicheskogo stroeniya i formirovaniya zalezhey na effektivnost' vyrabotki zapasov osnovnykh produktivnykh plastov Povkhovskogo i Vat''eganskogo mestorozhdeniy. Diss. kand. tekhn. nauk. Ufa, 170 p. (In Russian).

29. Fazylova, L. R., Kotenev, Yu. A., Chudinova, D. Yu., Valeev, A. S., & Dulkarnaev, M. R. (2016). Osobennosti raspredeleniya fizicheskikh svoystv nefti v plastakh Vat'eganskogo neftyanogo mestorozhdeniya. Sbornik nauchnykh trudov 43 rd Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii molodykh uchenykh, aspirantov i studentov, posvyashchennoy 60-letiyu filiala UGNTU v gorode Oktyabr'skom. Materialy v dvukh tomakh, Tom 1, pp. 263-267. (In Russian).