Research and application of optimized fracturing technology in Yonghe gas field

Yonghe gas field is a lithologic gas reservoir with low permeability,low pressure and low abundance.After conventional fracturing treatment,flowback becomes difficult and big formation damage and poor fracturing stimulation have been produced.Therefore,through injecting liquid nitrogen,speeding up flowback velocity and reducing formation damage of fracturing liquid,new fracturing technology with low formation damage and high cost-effective fractu-ring liquid system has been optimized.Field application indicates the fracturing stimulation technology can meet the need of low cost development strategy in Yonghe gas field.