Engineering and Technological Approaches to Well Killing in Hydrophilic Formations with Simultaneous Oil Production Enhancement and Water Shutoff Using Selective Polymer-Inorganic Composites

Meshalkin V. Asadullin R. Vezhnin S. Voloshin A. Gallyamova R. Deryaev A. Dokichev V. Eshmuratov A. Lenchenkova L. Pavlik A. Politov A. Ragulin V. Saduakassov D. Safarov F. Tabylganov M. Telin A. Yakubov R.
September 2025 Multidisciplinary Digital Publishing Institute (MDPI)

Energies
2025 #18 Issue 17

Well-killing operations in water-sensitive hydrophilic formations are often complicated by extended well clean-up periods and, in some cases, failure to restore the well’s production potential post-kill. Typical development targets exhibiting these properties include the Neocomian and Jurassic deposits of fields in Western Siberia and Western Kazakhstan. This paper proposes a well-killing method incorporating simultaneous near-wellbore treatment. In cases where heavy oil components (asphaltenes, resins, or paraffins) are deposited in the near-wellbore zone, their removal with a solvent results in post-operation flow rates that exceed pre-restoration levels. For wells not affected by asphaltene, resin, and paraffin deposits, killing is performed using a blocking pill of invert emulsion stabilized with an emulsifier and hydrophobic nanosilica. During filtration into the formation, this emulsion does not break but rather reforms according to the pore throat sizes. Flow rates in such wells typically match pre-restoration levels. The described engineering solution proves less effective when the well fluid water cut exceeds 60%. For wells exhibiting premature water breakthrough that have not yet produced their estimated oil volume, the water source is identified, and water shutoff operations are conducted. This involves polymer-gel systems crosslinked with resorcinol and paraform, reinforced with inorganic components such as chrysotile microdispersions, micro- and nanodispersions of shungite mineral, and gas black. Oscillation testing identified the optimal additive concentration range of 0.6–0.7 wt%, resulting in a complex modulus increase of up to 25.7%. The most effective polymer-inorganic composite developed by us, incorporating gas black, demonstrates high water shutoff capability (residual resistance factor ranges from 12.5 to 65.0 units within the permeability interval of 151.7 to 10.5 mD). Furthermore, the developed composites exhibit the ability to selectively reduce water permeability disproportionately more than oil permeability. Filtration tests confirmed that the residual permeability to oil after placing the blocking composition with graphene is 6.75 times higher than that to water. Consequently, such treatments reduce the well water cut. Field trials confirmed the effectiveness of the developed polymer-inorganic composite systems.

field trials , hydrophilic low-permeability reservoirs , laboratory studies , organic solvents , water shutoff using polymer-gel composites reinforced with micro/nano-sized natural inorganic materials , well killing with simultaneous stimulation and water shutoff

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Department of Logistics and Economic Informatics, International Institute of Resource Saving Logistics and Technological Innovation, Dmitry Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Square, Moscow, 125047, Russian Federation
World-Class Laboratory “LaMiUr”, Saint-Petersburg State Institute of Technology, Moscow Prosp. 24-26/49, Saint-Petersburg, 190013, Russian Federation
Faculty of Mining and Petroleum, Ufa State Petroleum Technological University, 1 Kosmonavtov Street, Ufa, 450064, Russian Federation
Ufa Scientific and Technical Center, LLC, 99/3 Kirova Street, Ufa, 450078, Russian Federation
Ufa Institute of Chemistry, Ufa Federal Research Center, Russian Academy of Sciences, 71 Oktyabrya Avenue, Ufa, 450054, Russian Federation
Department of Well Drilling, Scientific Research Institute of Natural Gas of the State Concern “Turkmengas”, Ashgabat, 744000, Turkmenistan
Department of Geodesy, Cartography and Natural Resources, Karakalpak State University, Nukus, 230100, Uzbekistan
Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch RAS, 18 Kutateladze Street, Novosibirsk, 630128, Russian Federation
Department of Petrochemical Engineering, S. Yessenov Caspian University of Technologies and Engineering, 1 Microdistrict 32, Aktau, 130000, Kazakhstan

Department of Logistics and Economic Informatics
World-Class Laboratory “LaMiUr”
Faculty of Mining and Petroleum
Ufa Scientific and Technical Center
Ufa Institute of Chemistry
Department of Well Drilling
Department of Geodesy
Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch RAS
Department of Petrochemical Engineering

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