RHEOLOGICAL PROPERTIES AND DESTRUCTION KINETICS OF FOAM POLYMER SOLUTIONS WITH PLANT-BASED FILLERS

Abstract

Rheological characteristics and destruction kinetics of foam polymer solutions (FPS) with plant-based fillers intended for well killing under abnormally low formation pressure (ALFP) conditions were studied. The relative viscosity of compositions with various stabilizers (liquid glass, NaCl) and plant fillers (crushed straw, nutshells, cotton husk) was determined. It was found that replacing liquid glass with sodium chloride leads to the formation of a non-flowing structure with high resistance to stratification (8 days). For the first time, kinetic curves of foam destruction over 8 days were obtained, showing three stages: initial stabilization (0-2 days), slow coalescence (2-5 days), and structural equilibrium (5-8 days). It was shown that the introduction of crushed straw increases the initial viscosity of the system and slows down the destruction rate by 40% compared to the composition without filler. Cotton husk, on the contrary, sharply reduces viscosity and accelerates foam collapse (complete destruction in 1 day). A direct correlation was established between the relative viscosity of FPS and its stability (R² = 0.92 for the studied sample set). Rheological studies explain the mechanism of the blocking action of FPS: the formation of a highly viscous structured foam matrix reinforced with plant particles creates an effective barrier to filtration. The identified destruction stages are characteristic of the studied compositions and require verification on other foam systems.