Control of rheological properties of drilling fluids stabilized with polyacrylates and polysaccharide
Abstract
Control of rheological properties of drilling fluids is of utmost importance in terms of accident risk mitigation, ensuring safe and accident-free drilling conditions and avoiding complications and hazards in the well. The paper presents results of laboratory study of rheological properties of model drilling fluids based on montmorillonite clays of the Keles deposit (Kazakhstan) stabilized by three types of regulating additives: two water-soluble acrylic polyelectrolytes – Uniflock reagent (pre-synthesized hydrolyzed polyacrylonitrile) and an analogue of polyacrylamide, as well as modified starch, each agent added in the range of concentrations of 0.1–1%. The values of basic rheological parameters of the studied systems have been measured. A relationship has been established between the level of polymer additives in the model drilling fluid and apparent and plastic viscosity, as well as dynamic shear stress of the systems. Introduction of all three types of additives is found to provide reliable control of the rheological properties of the drilling fluids with the best results obtained for using (0.5-1.0%) polyacrylamide analogue produced from waste.
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