Regulation of comb-type thermo-sensitive polymer on high-temperature rheological properties of solid-free water-based drilling fluid
In view of the problem that existing polymer tackifiers have the defect of viscosity reduction at high temperature and cannot effectively regulate the high-temperature rheological properties of solid-free water-based drilling fluid,acrylamide(AM)/new ther-mo-sensitive monomer(MVC)/sodium 2-acrylamido-2-methylpropane sulfonate(Na AMPS)comb-type thermo-sensitive polymer(TSP-Comb)was prepared by free radical micellar polymerization.The molecular structure and weight-average molecular weight of TSP-Comb were characterized and measured by infrared spectroscopy,nuclear magnetic hydrogen spectroscopy and gel permeation chromatography.The thermal stability and microstructure of TSP-Comb molecular chain were measured by thermo gravimetric anal-ysis(TGA)and environmental SEM,respectively.The temperature response characteristics of TSP-Comb was studied using rheome-ter and visible spectrophotometer,and the regulation effect of TSP-Comb on the high-temperature rheological properties of solid-free water-based drilling fluid was also studied.The results show that TSP-Comb solution has excellent high-temperature thickening property within the temperature range of 90 ℃ to 180 ℃ and higher phase transition temperature(higher than 60 ℃).Compared with linear thermo-sensitive polymers,TSP-Comb has been significantly improved in terms of high-temperature rheological stability and phase transition temperature.The high-temperature thickening property of TSP-Comb helps improve the high-temperature rheo-logical properties of solid-free drilling fluid.The change rate of rheological parameters such as apparent viscosity,plastic viscosity and dynamic shear force of solid-free drilling fluid based on TSP-Comb was lower than 25％within a wide temperature range of 90 ℃ to 180 ℃,and TSP-Comb has significantly improved the high-temperature rheological stability of solid-free drilling fluid,providing a new method for regulating the high-temperature rheological properties of solid-free water-based drilling fluid.
comb-type polymerthermo-sensitive polymerhigh temperature thickeninghigh temperature rheologysolid-free drilling fluid
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