Russian Federation
Russian Federation
graduate student from 01.01.2024 until now
National University of Oil and Gas «Gubkin University» (Faculty of Chemical Technology and Ecology, Engineer)
from 01.01.2022 to 01.01.2024
Kazan National Research Technological University (Institut polimerov)
student from 01.01.2018 to 01.01.2022
Moskva, Moscow, Russian Federation
Water-soluble polymers are classified as natural (xanthan, guar, native cellulose), artificial (modified cellulose), and synthetic (polyacrylamide). Due to their ability to increase water viscosity, these polymers are widely used in chemical enhanced oil recovery methods (polymer, surfactant-polymer, and alkali-surfactant-polymer flooding). Despite the high resistance of biopolymers to degradation under the influence of highly mineralized formation water and elevated temperatures, the most common representative of this class is polyacrylamide (hydrolyzed, sulfonated). However, its significant limitation is its susceptibility to degradation, the formation of insoluble globules, and, consequently, a decrease in viscosity. Traditionally, the resistance of polyacrylamide to chemical, mechanical, or thermal-oxidative degradation has been assessed by a decrease in the screen factor or dynamic viscosity. In this study, the solubility and the effect of increasing the mineralization of model water are assessed using a viscometric method (relative method) to determine the intrinsic viscosity and molecular weight of anionic acrylamide copolymers. The Huggins coefficient, Kuhn segment, hydrodynamic radius, and macromolecular coil volume were calculated using the molecular weight and intrinsic viscosity values. Increasing the mineralization of the sample water leads to a decrease in the intrinsic viscosity, molecular weight, hydrodynamic radius, and macromolecular coil volume. For a sulfonated sample synthesized for high mineralization and reservoir temperature conditions, the Huggins constant decreases with a simultaneous increase in the Kuhn segment (hardness), indicating good affinity between the polymer and solvent and the applicability of PAM under the selected conditions. This method for determining solubility and stability under challenging reservoir conditions can be recommended in addition to the method for determining the stability coefficient by measuring the screen factor or dynamic viscosity.
POLYACRYLAMIDE, DISSOLUTION, HUGGINS COEFFICIENT, KUHN SEGMENT, HYDRODYNAMIC RADIUS, CAPILLARY VISCOMETRY
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