Experience in application of gel-forming compositions for water shut-off purposes in fields operated by Oil and Gas Production Department Leninogorskneft of Tatneft PJSC

UDK: 622.276.7:622.245.67

DOI: 10.24887/0028-2448-2020-7-36-39

Key words: reduction of excess water production, water cut, water shut-off treatment, gel-forming compositions, technological performance, statistical estimation

Authors: I.F. Galimov (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk), А.S. Akhmetshina (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk), А.Т. Zaripov (TatNIPIneft, RF, Bugulma), А.N. Beregovoy (TatNIPIneft, RF, Bugulma), N.А. Knyazeva (TatNIPIneft, RF, Bugulma), О.I. Afanaseva (TatNIPIneft, RF, Bugulma)

Tatneft Company devotes considerable attention to the search and implementation of new technology solutions to enable extension of field economic life by managing fluid production fr om heterogeneous oil-producing reservoirs (structurally complex production zones) through partial or complete shut-off of water production intervals or seal-off of water conductive fractures. For this purpose, water shut-off treatments can be performed to reduce excess production of produced water and hence, decrease (stabilize) wellstream water cut. Excess water production can occur due to a number of different reasons; including different mobility of oil and displacing agent (particularly, water injected to maintain reservoir pressure), geological heterogeneity, presence of high-permeability intervals, which are the primary frontal advance channels. High water cut can also result fr om bottom water coning and inter-reservoir fluid communication between the producing reservoir and adjacent waterflooded or water-saturated intervals due to lack of continuous impermeable barrier in presence of extensive vertical fracture networks or faults. A variety of physical and chemical methods for formation treatment, which has been widely practiced in the oil industry, enable mitigation of adverse effects of these factors on production performance, reduction (stabilization) of wellstream water cut and enhancement of oil production. These improvements can be achieved through treatments of both production and injection wells. This approach has been successfully used in Tatneft Company for development of terrigenous reservoirs. However in carbonate reservoirs, arrangement of efficient reservoir pressure maintenance system is challenging (due to absence of connectivity between injection and production wells and “instantaneous” breakthrough of injected water through well-developed fracture system). In such reservoirs, water shut-off in production wells is often the only way of water cut control. References 1. Kadyrov R.R., Metody ogranicheniya vodopritoka pri stroitel'stve i ekspluatatsii skvazhin (Methods of water shutoff during the construction and operation of wells): thesis of doctor of technical science, Bugul'ma, 2009. 2. Patent no. 2382185 RF, MPK E 21 V 43/22, C 09 K 8/90, Method for injection well infectivity profile aligning and water in-flow limitation for production well (Versions), Inventors: Ibatullin R.R., Amerkhanov M.I., Rakhimova Sh.G., Beregovoy A.N., Zolotukhina V.C., Latypov R.R., Khisamov R.S. 3. Amerkhanov M.I., Beregovoy Ant.N., Rakhimova Sh.G. et al., Razrabotka i opyt primeneniya novykh vysokoprochnykh polimernykh sistem dlya ogranicheniya vodopritoka v dobyvayushchie skvazhiny (Development and experience in the application of new high-strength polymer systems to lim it water inflow into production wells), Collected papers “Innovatsii i tekhnologii v razvedke, dobyche i pererabotke nefti i gaza” (Innovations and technologies in the exploration, production and refining of oil and gas), Proceedings of International scientific and practical conference dedicated to the 60th anniversary of Tatneft OAO, Kazan, 8–10 September 2010, Kazan: Fen Publ., 2010, pp. 19-22. 4. Amerkhanov M.I., Beregovoy Ant.N., Rakhimova Sh.G. et al., Rezul'taty primeneniya tekhnologii ogranicheniya vodopritoka v dobyvayushchie skvazhiny s ispol'zovaniem vysokoprochnykh polimernykh sistem (The results of the application of technology to lim it water inflow into production wells using high-strength polymer systems), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2012, V. 80, pp. 134–138. 5. Beregovoy Ant. N., Rakhimova Sh.G., Vasil'ev E.P., Afanas'eva O.I., Belov V.I., Razumov A.R., Rezul'taty primeneniya kompleksa tekhnologiy VPSD dlya ogranicheniya vodopritoka v dobyvayushchie skvazhiny (Results of application of high-strength polymer systems for water shut-off), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2017, V. 85, pp. 264–272. 6. Rakhimova Sh.G., Beregovoy Ant.N., Knyazeva N.A., Andriyanova O.M., A research into effects of water composition on gel formation process and gel stability during on-site preparation of polymer (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 7, pp. 28–31. 7. Sachs L., Statistisehe Auswertungsmethoden, Springer-Verlag, Berlini-Heidelberg-New York 1972.