By adding gelling agent to hydrochloric acid and mud acid, the technology increases the viscosity of acid solution, reduces the diffusion of acid solution to fracture surface, and forms colloidal network structure to prevent hydrogen ion activity, thus playing a retarding role. In addition, the residual acid after the reaction can still maintain a certain viscosity, and can carry out acid insolubles and reaction residues during the flowback, reducing the secondary damage of solid particles to the fracture conductivity. It is suitable for deep acid fracturing transformation and deep acidizing treatment of carbonate reservoirs, and can also be used for acidizing and acidizing operations of fractured volcanic reservoirs and complex lithologic reservoirs with high carbonate content.

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