Research and application of non-flowback fracturing fluid technology in Daqing oilfield

Hydraulic fracturing of low permeability reservoir in Daqing oilfield has become the main technology of stimulation, however, there exist environmental pressure and high cost in the process of fracturing waste fluid treatment, and the delayed flowback after fracturing will damage the reservoir and affect the effect of augmented injection. Therefore, the clean and environment-friendly fracturing fluid without backflow has been successfully developed through tackling technical problems. The fracturing fluid has the technical advantages of low cost, low damage, zero outer drainage of oil wells and non-backflow of water wells. The technology has been applied to 154 wells in low permeability reservoir of Daqing oilfield, and the construction success rate is 100%, among which, 88 wells increased oil by 3.8×10~4 t, 66 wells increased water by 51.2×10~4 m~3, and the effluent fracturing fluid was reduced by 3.2×10~4 m~3, meeting the requirements of "zero pollution and zero emission".