Abstract
In order to solve the poor water infusion problem for low permeability coal seams, this paper studied the self-diverting acid to uniformly distribute acid. The results show that massive Ca2+ generated by the reaction between HCl and calcite can enhance the crosslinking of micelles. With the increase of HCl concentration, the viscosity increased and then decreased, which could be divided into “low viscosity zone” (0.1%–2%), “viscosity rapid increase zone” (2%–5%) and “viscosity decrease zone” (5%–15%). After treated with self-diverting acid, the fracture width and connectivity of coal was increased. Massive clay minerals were dissolved, the distribution range of pore size and pore volume gradually increased, and a large number of pores caused by corrosion appeared. Due to the influence of viscosity, the wettability of self-diverting acid for the coal was gradually reduced during infusion process. However, compared with distilled water, the overall wettability of coal still increased by 6.91%.
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