Funct. Mater. 2024; 31 (2): 276-284.

was prepared using double-hydrogen-terminated silicone oil (DHSO), allyl glycidyl ether (AGE), and triethylamine hydrochloride (TH) as raw materials. The structure was characterized by Fourier transform infrared spectroscopy (FTIR). The effect of the anti-water blocking agent on damage of water blocking of the brine solution in core pores was studied. The results showed that the anti-water-blocking agent significantly reduced the surface tension of the brine solution (less than 15 mN/m), and increased the water contact angle on the core surface to 85.3°, indicating that the anti-water blocking agent can transform the core surface from hydrophilicity to neutral and effectively reduce the viscous force of the water phase as it moves through the pores of the core. In addition, the anti-water blocking agent reduced the self-absorption and water blocking damage of the core, and improved the recovery rate of core permeability. A reasonable explanation of the results is that DAT-1 molecules are stably adsorbed in the sandstone core by the electrostatic force, the nonpolar segments are exposed to the sandstone surface to form a strong hydrophobic molecule layer, thereby changing in the wettability, and effectively reducing the invasion of water into the formation during drilling and completion operations. This is of great importance to the protection of the productivity of a low permeability reservoir.