A novel treatment for mitigating condensate damage and improving reservoir productivity using thermochemical fluids

This work presents a novel treatment for mitigating the condensate damage and improving the reservoir productivity using thermochemical fluids. Experimental measurements and numerical simulation were carried out. The experimental measurements include kinetic reaction, coreflooding experiments, NMR (nuclear magnetic resonance) and capillary pressure measurements. The used rock samples (shale, sandstone, and carbonate) were characterized using NMR and routine core analysis. Moreover, numerical simulation was conducted using CMG software. Field scale simulation was conducted to evaluate the effectiveness of thermochemical treatment in increasing the ultimate gas recovery from tight gas reservoir. Results showed that thermochemical treatment can mitigate the condensate damage by around 60%, decrease the capillary forces by 55% and increase the absolute open flow up to 450%. Permeability and NMR measurements showed that multiple fractures were induced after the treatment, the absolute permeability increase by more than 200 times. Furthermore, the field scale simulation showed that thermochemical treatment can increase the ultimate gas recovery up to 89.1% compared to 25.3% using cyclic gas injection, at same conditions. Ultimately, this work can lay the foundation for real field application of thermochemical treatment.