No.2(42),2025 PP.142-150

Neftyanaya provintsiya No. 2(42), 2025

Water shutoff techniques for fractured reservoirs

R.Z. Ziyatdinov, V.M. Valovsky, A.S. Zhirkeev, A.K. Sakhapova
DOI: https://doi.org/10.25689/NP.2025.2.142-150

Abstract

Water-producing fractured reservoirs are one of the sources of gas, oil and water kicks due to their high permeability and insufficient range of pressure thresholds. Fractures can reach an aquifer or an overlying gas cap, thus making a path for gas or water to producing wells. They can cause well-killing fluid losses during well workover operations. Moreover, micro- and macrofractures can expand, deepen and break under high flowing pressures, forming an extensive fracture network which results in caving, bridge-over, and lost circulation. Waterflooding of carbonate fractured or cavernous fractured reservoirs can be accompanied with rapid breakthrough of the injected water into producing wells.
To shutoff fractured reservoirs in case of gas, oil and water kicks, various methods are used:
– injection of plugging materials, for example, clay-polymer slurries, viscoelastic polymer systems, liquid glass, oil, and oil products;
– injection of water-swelling polymers.
The study is aimed at development of methods to mitigate risks of gas, oil and water kicks in water-producing fractured reservoirs.
This research resulted in the improved efficiency and success rate of the operations as compared with plugging Portland cement. The efficiency is improved by more rapid mixing of two streams of water shutoff system components, as well as by simplifying the application technology due to the use of neonol with lower freezing point.

Key words:

model tests, proppant, polyacrylamide, curable plugging material, clay-silicate solution, silicone compound, water shutoff barrier, pressure differential, clay mud

References

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Authors

R.Z. Ziyatdinov, Head of Sector, TatNIPIneft Institute of PJSC Tatneft
149A, Sovetskaya Str., Bugulma, 423230, Russian Federation
E-mail: zrz5969@tatnipi.ru

V.M. Valovsky, Dr.Sc., Professor, TatNIPIneft Institute of PJSC Tatneft
2, Lenina Str., Bugulma, 423230, Russian Federation
E-mail: zrz5969@tatnipi.ru

A.S. Zhirkeev, PhD, Head of Laboratory, TatNIPIneft Institute of PJSC Tatneft
2, Lenina Str., Bugulma, 423230, Russian Federation
E-mail: jirkeev@tatnipi.ru

A.K. Sakhapova, PhD, Head of Sector, TatNIPIneft Institute of PJSC Tatneft
5, Engelsа Str., Bugulma, 423230, Russian Federation
E-mail: ers119@tatnipi.ru

For citation:

R.Z. Ziyatdinov, V.M. Valovsky, A.S. Zhirkeev, A.K. Sakhapova Metodi izolyacii obvodnyyennih treschinovatih kollekttorov [Water shutoff techniques for fractured reservoirs]. Neftyanaya Provintsiya, No. 2(42), 2025. pp.142-150. DOI https://doi.org/10.25689/NP.2025.2.142-150. EDN IILIAB (in Russian)

© Non-governmental organization Volga-Kama Regional Division of the Russian Academy of Natural Science, 2015-2025 All the materials of the journal are available under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/)

Water shutoff techniques for fractured reservoirs R.Z. Ziyatdinov, V.M. Valovsky, A.S. Zhirkeev, A.K. Sakhapova DOI: https://doi.org/10.25689/NP.2025.2.142-150

Key words: model tests, proppant, polyacrylamide, curable plugging material, clay-silicate solution, silicone compound, water shutoff barrier, pressure differential, clay mud

Water shutoff techniques for fractured reservoirs

R.Z. Ziyatdinov, V.M. Valovsky, A.S. Zhirkeev, A.K. Sakhapova
DOI: https://doi.org/10.25689/NP.2025.2.142-150

Key words:

model tests, proppant, polyacrylamide, curable plugging material, clay-silicate solution, silicone compound, water shutoff barrier, pressure differential, clay mud