Heat-Resistant Polymeric Modifier of Drilling Fluid Based on Potassium Salt of Acrylamide Copolymer

Abstract

The article presents the results of synthesis and research of a new polymer modifier of drilling mud based on potassium salt of a copolymer of acrylamide and acrylic acid. The objective of the work is to increase heat resistance and inhibitory properties of aqueous drilling muds at high temperatures due to the introduction of partially hydrolyzed polyacrylamide. It is shown that the synthesized copolymer has a high-molecular structure and resistance to thermal decomposition. Optimum conditions for obtaining the polymer - a neutral environment (pH ~ 7-8) and a polymerization temperature of about 70 ° C - provide the maximum molecular weight and efficiency of the reagent. Laboratory tests demonstrate that the addition of 0.5-1.0% of this polymer significantly improves the rheological characteristics of the drilling mud at 120-150 ° C, reduces water loss and suppresses swelling of clay particles. Due to the presence of potassium in the polymer, an additional inhibitory effect is achieved compared to traditional polyacrylamide reagents. The obtained results confirm the potential of using the developed modifier for stabilizing drilling fluids in complex geological and technical conditions.