Research and application of mixed water volume fracturing technology in tight gas reservoir in Dongsheng gas field

Dongsheng gas field belongs to a typical low–permeability, low–porosity gas reservoir in Ordos basin. Gas wells must be fractured to obtain the productivity. However, the yield increase is limited by conventional fracturing process. Therefore, according to the volume fracturing conception, the oilfield has carried out mixed water fracturing technology research to improve the traditional fracturing technology referring tight reservoir development experience of North America and the reservoir characteristics of lower Shihezi formation in the block. The main cracks are formed by the mixed water fracture, at the same time, natural cracks continue to spread which can form a larger joint network system. All of these can improve the fracture conductivity, increase the fracturing volume and improve the single well production. The yield effect is obvious in the JH1 well of Dongsheng gas field, and the open flow capacity is 25.0×10~4 m~3/d,and the average gas production is 4.8×10~4 m~3/d, which provides the technical support for the effective development of the tight gas reservoir in Dongsheng gas field.