Compared with the conventional sandstone reservoirs, the Es1 section of the Jidong Pugu 2 gas storage reservoir not only has the characteristics of high clay content, strong hydrophilicity of the rock and strong heterogeneity of the reservoir, but also has the unique features of strong stress sensitivity of the reservoir and strong particle migration caused by strong injection and production, which makes the under-injection situation of this reservoir even more serious。 Based on the above-mentioned under-injection mechanism, the idea of unblocking and increasing injection was determined as anti-swelling acid + organic solvent + water lock release agent + temporary plugging and flow diversion agent. Eventually, a composite injection enhancement system of anti-swelling acid + 1.0% SA-G + 0.3% SA-FT + SA-1 was developed.The swelling resistance, surface tension reduction ability, wetting reversal ability, swelling dispersion and degradation effect and temporary plugging performance of the system were systematically evaluated. The experimental results show that the anti-swelling rate of the system is 92.3%, and the anti-swelling performance is good.The surface activity is high, and the surface tension of oil and water can be reduced to 23.0 mN/m after treatment; The wetting reversal effect is obvious, and the oil-water contact angle after treatment is > 80°; Can fully swell and disperse micelles, and the degradation rate of organic micelles is over 90%; The temporary plugging effect is good, and the recovery degree of core permeability is more than 90% after plugging removal.The research results provide a feasible method for plugging removal and injection enhancement of gas storage, and provide theoretical basis and technical guidance for the development of plugging removal and injection enhancement system of similar sandstone gas storage.