TY - JOUR

T1 - Development of Viscoplastic and Viscoelastic Silicate-Containing Compositions Reinforced with Rice Husks for Water Insulation in Oil Wells

AU - Telin, A. G.

AU - Akhmetov, A. T.

AU - Lenchenkova, L. E.

AU - Politov, A. A.

AU - Fakhreeva, A. V.

AU - Yakubov, R. N.

N1 - This work is supported by the state budget under the state assignment for 2019–2022 (no. 0246-2019-0052), using the equipment of the RCCU Agidel UFRC RAS and the state assignment to ISSChM SB RAS (no. 122011700261-3). Development of Viscoplastic and Viscoelastic Silicate-Containing Compositions Reinforced with Rice Husks for Water Insulation in Oil Wells / A. G. Telin, A. T. Akhmetov, L. E. Lenchenkova, A. A. Politov, A. V. Fakhreeva, R. N. Yakubov // Theoretical Foundations of Chemical Engineering. - 2025. DOI: 10.1134/S0040579525601736

PY - 2025/10/14

Y1 - 2025/10/14

N2 - Abstract: The article provides a justification for the gel-forming composition for well water insulation based on sodium silicate, polyacrylamide (PAA), and chromium acetate, with increased strength characteristics due to the introduction of a dispersed additive, rice husk, which simultaneously exhibits viscoplastic and viscoelastic properties. Oscillation testing is used to determine the elastic modulus (G') and loss modulus (G"), the linear measurement range, and the quantitative determination of the viscoelastic and viscoplastic properties of the hydrogel, based on the interpretation of creep and recovery study results using the mechanical models of Maxwell, Kelvin–Voigt, and Burgers, which are successfully applied to the behavior of polymer systems. It is established that when approximating experimental measurements, one link of the Kelvin–Voigt model is not sufficient; therefore, the Burgers computational model is recommended, which corresponds to two relaxation times of a viscoelastic medium due to two types of crosslinking: ionic (from the bonding of the chromium ion with the polymer) and flocculation (from the flocculation of dispersed rice husk particles by polymer macromolecules). Filtration studies performed on a model of an ideal crack with different openings (from 0.01 to 0.1 cm) establish that the introduction of rice husk into the hydrogel composition increases its strength characteristics and resistance to mechanical destruction. In the case of filtration through a 0.1 cm slit, there is no noticeable difference in the rheological behavior of the hydrogel with and without rice husk, except for some strengthening of the gel during filtration at low shear rates. A mechanism responsible for the behavior of the hydrogel with this dispersed additive in cracks of various openings is proposed. The application of the developed hydrogel composition is promising in real fractured reservoirs through which water flows to the well and, as a consequence, causes flooding.

AB - Abstract: The article provides a justification for the gel-forming composition for well water insulation based on sodium silicate, polyacrylamide (PAA), and chromium acetate, with increased strength characteristics due to the introduction of a dispersed additive, rice husk, which simultaneously exhibits viscoplastic and viscoelastic properties. Oscillation testing is used to determine the elastic modulus (G') and loss modulus (G"), the linear measurement range, and the quantitative determination of the viscoelastic and viscoplastic properties of the hydrogel, based on the interpretation of creep and recovery study results using the mechanical models of Maxwell, Kelvin–Voigt, and Burgers, which are successfully applied to the behavior of polymer systems. It is established that when approximating experimental measurements, one link of the Kelvin–Voigt model is not sufficient; therefore, the Burgers computational model is recommended, which corresponds to two relaxation times of a viscoelastic medium due to two types of crosslinking: ionic (from the bonding of the chromium ion with the polymer) and flocculation (from the flocculation of dispersed rice husk particles by polymer macromolecules). Filtration studies performed on a model of an ideal crack with different openings (from 0.01 to 0.1 cm) establish that the introduction of rice husk into the hydrogel composition increases its strength characteristics and resistance to mechanical destruction. In the case of filtration through a 0.1 cm slit, there is no noticeable difference in the rheological behavior of the hydrogel with and without rice husk, except for some strengthening of the gel during filtration at low shear rates. A mechanism responsible for the behavior of the hydrogel with this dispersed additive in cracks of various openings is proposed. The application of the developed hydrogel composition is promising in real fractured reservoirs through which water flows to the well and, as a consequence, causes flooding.

KW - chromium acetate

KW - hydrogel

KW - mechanical activation

KW - oil wells

KW - polyacrylamide

KW - pore-fractured reservoirs

KW - rice husk

KW - sodium silicate

KW - viscoelasticity

KW - viscoplasticity

KW - water insulation

UR - https://www.mendeley.com/catalogue/9e7c2f69-fd54-3337-b484-c76cbc6ae0ca/

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105018775072&origin=inward

U2 - 10.1134/S0040579525601736

DO - 10.1134/S0040579525601736

M3 - Article

JO - Theoretical Foundations of Chemical Engineering

JF - Theoretical Foundations of Chemical Engineering

SN - 0040-5795

ER -