Influence of Supercritical CO2 on the Formation Sensitivity of Tight Sandstone

It is challenging to get water-based fracture fluid flow back into low-pressure gas reservoirs. In order solve the problem, supercritical CO 2 a novel type of non-aqueous fracturing technique with wide range applications prospect in tight sandstone. determine whether sandstone feasible cores from Jinqiu Gas field Sichuan Basin were used evaluate influence on formation sensitivity Supercritical was interact samples under conditions, and then changes velocity sensitivity, water salinity alkaline acid stress observed. Velocity damage decreased by 5.4%, 13.3%, 16.6%, 2%, 14.4%, increased 8% after interaction between . This finding provides quantitative assessment impact it can be build scheme for water-sensitive