Self-generated hydrochloric acid acidification method suitable for carbonate rock reservoir

The invention discloses a self-generated hydrochloric acid acidification method suitable for carbonate rock reservoir. The self-generated hydrochloric acid acidification method sequentially comprises the following steps: (1) adding water and chloroacetic acid into a liquor preparation tank in a mass ratio of (1-8) to 1, and uniformly mixing to obtain an A-agent chloroacetic acid solution; (2) adding phenol, ethylene glycol butyl ether and water into the liquor preparation tank in a mass ratio of (1-8) to (0.1-1) to 1, thereby obtaining B-agent phenol liquor when phenol is completely dissolved; (3) injecting a fracturing fluid into reservoir under high pressure for cracking stratum; (4) firstly injecting the agent A into the carbonate rock reservoir; (5) injecting the agent B into the carbonate rock reservoir, wherein a mass ratio of the chloroacetic acid to the phenol is 1 to 1; and (6) injecting a displacing liquid into shaft, and injecting the agent B in the shaft into the deep part of the reservoir. The self-generated hydrochloric acid acidification method can effectively improve deep penetrating power of acid liquor to the carbonate rock reservoir, so that the deep part of the reservoir can be modified, and oil and gas field output is improved.