Abstract
The coal reservoir in Block M is the low-permeability coal reservoir, in the process of coalbed gas production, since different degrees of blockage occurs in the fracture and pore of the coal reservoir; as a result, the production of coalbed methane is low or shut down. In this paper, the coal rock reservoir in Block M as the research object, and the acidification and blockage removal acid system was selected, and the acidification and blockage removal effect of the optimal acid liquid was evaluated. The coal core soaking experiment was carried out to test the permeability and porosity of the coal core before and after acidification, the experiment showed that the permeability of the coal core was increased to 1.9 to 15.3 times, and the porosity was increased by 0.25% to 3.56%.
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