Research and Application of High-Efficient Vertical Well Multi-stage Fracturing Technology Without Moving String in Daqing Oilfield

Daqing oilfield is a giant, heterogeneous, multilayer sandstone oilfield with 80–120 small layers, interlayer permeability difference of over 60 times. The development of the oilfield has aimed at relatively thinner and less permeable layers to maintain the stable production. It is commonly believed that fracturing is an effective way to recover oil from thin, low porosity and low permeability sands. The fine control of fracturing stimulation can effectively improve the recovery effect.