Polymer structure-forming agents for control the characteristics of drilling fluids

Abstract

Polyacrylamide and its derivatives are the most widely used industrial water-soluble acrylic polymers due to their low cost and high molecular weight. In drilling, there is a great demand for associating copolymers of acrylamide and hydrophobic comonomers. Therefore, the processes of synthesis and hydrolysis of the copolymer of acrylamide and maleic acid were studied to obtain drilling fluid stabilizers. The highest viscosity characteristics are demonstrated by samples of polymers obtained at a molar ratio of 1:7≤8. The yield of polymeric products is about 92.6, 98.1, and 96.3%, at a molar ratio of acid and acrylamide АA 1:5, 1:7, and 1:10, respectively. It has been established that an increase in the temperature of the polymer hydrolysis system contributes to an increase in the degree of conversion. Therefore, at temperatures above 80°C, an increase in yield is observed, which is primarily due to a decrease in the viscosity of the system and due to an increase in the speed of movement of polymer macromolecules. The polymer obtained in this way - MKAA-7 is characterized by higher viscosity and improved filtration characteristics compared to commercial drilling fluid stabilizers, such as hydrolyzed polyacrylonitrile, PAА and CMC (carbossimetilcellulosa).