Study on a new type of lotion waterproof locking agent suitable for low permeability gas reservoir
In order to effectively reduce the water blocking damage in the development of low-permeability gas reservoirs,a new lotion waterproof locking agent FRT-2 was prepared with sodium dodecyl sulfate K12,methyl isobutyrate MMA,acrylic acid AA and butyl acrylate BA as the main raw materials,and its comprehensive performance was evaluated.The results showed that the new lotion waterproof locking agent FRT-2 can significantly reduce the surface tension of the aqueous solution and has good surface activity;FRT-2 can effectively improve the wettability of the natural core surface in the target low permeability gas reservoir,making it change from hydrophilic to neutral wettability;FRT-2 has a good inhibition performance on cuttings and cores in the reservoir section;FRT-2 also has excellent waterproof lock performance.When using FRT-2 solution with a mass fraction of more than 1%to displace a core,the water lock damage rate of the core can be reduced to less than 20%,and the degree of water lock damage was weak.The research results showed that the new lotion waterproof locking agent FRT-2 has good comprehensive performance and can be used in the development of low-permeability gas reservoirs.
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