Massive hydraulic fracture research and its application to tight sandstone gas reservoir——Taking Shaximiao gas reservoir in the west of Sichuan Basin as an example

Shaximiao reservoir of Xinchang gas field is a typical low permeability and tight sandstone gas reservoir in China with great thickness, large-scale sand body, large well spacing, and obvious stress difference between cover and pay formation, in which massive hydraulic fracture can be carried out to prolong producing time of gas wells. Low damage fracturing fluids was formulated, viscosity break was intensified, high efficiency flowback technology was used, and parameters of massive fracture were optimized. At last, massive hydraulic fracture with the characteristics of large scale, high flow rate, middle-high proppant concentration, and forced viscosity break was successfully operated in field, and the largest scale of fracturing was 200.5 m³. The field application practice indicated that the fracture effect was exceptionally remarkable.