Fracturing technology for low permeability sandstone reservoirs in Liuxi oilfield

the Liuxi sandstone reservoir is characterized by poor permeable formation, large number of layers, layers with uneven thickness and serious heterogeneity and conflicts among formations. The fact that the injection wells absorb water difficultly with the development of the reservoir has made liquid delivery of reservoir is very poor, and most oil well is under the low production and low efficient condition. So the general stimulation treatment such as whole section fracturing can not improve the production by single and separate layer. Focus on the above problems, a low damaged fracturing fluid and the supporting technology have been developed, and during the multilayer fracturing for oil wells, different fracturing process combinations were adopted by optimizing treatment sections, and the result of output increase has been proved very well.　　Key words: fracturing process; low permeability; Liuxi sandstone reservoir; fracturing fluid; parameters optimization