Preparation and performance evaluation of small molecule ammonium salt inhibitors synthesized from mixed amines

Abstract

This paper focuses on the synthesis of polyhydroxy small molecule amines using mixed amines as raw materials. The anti-swelling experiment, swelling shrinkage experiment, linear swelling rate and clay hydration experiments were used to evaluate the application effect of the synthesized products in oilfield water-based drilling fluids. and suitable inhibitors were selected. The inhibition mechanism was investigated by TGA, laser particle size analysis and SEM. The inhibition of clay hydration swelling was best at a concentration of 0.1% with a 1:3 mass ratio of mixed amines to phosphoric acid, i.e., the product HS-1. The results of anti-swelling, swelling shrinkage and linear expansion experiments showed that the anti-swelling rate of 0.1% HS-1 on clay was 72.97%, the swelling shrinkage rate was 54.50% and the linear expansion rate was 27.30%, which was similar to the effectiveness of 4.0% KCl. It showed good inhibition of hydration swelling dispersion of clay.