A novel approach to determining appropriate additive concentrations for stimulation of gas carbonate reservoirs

Abstract

This comprehensive study delves into the intricate realm of matrix acidizing treatments within low-permeability gas reservoirs. The research scrutinizes the profound impact of various commercially available additives on acidizing processes, with a keen focus on optimizing their concentrations. By meticulously assessing compatibility, corrosion control, surface tension, and wettability alterations, the study evaluates additives' performance under ambient and reservoir conditions. Notably, four distinct acids—15% hydrochloric acid, 12% hydrochloric acid +3% hydrofluoric acid, 15% acetic acid, and 12% acetic acid +3% hydrofluoric acid—underwent testing with various additives. Through systematic analysis, it's evident that the chosen concentrations of additives yield impressive results: corrosion rates below 0.05 lb/ft2, low surface tension, absence of iron precipitation, and sustained water-wet wettability. The study provides invaluable insights into additive selection, concentrations, and their pivotal role in enhancing acidizing within low-permeability gas reservoirs, ultimately improving overall operational performance and minimizing unfavorable consequences.