Study and application of gneiss reservoir reconstruction technology in the Bayanhetao basin

The Bayanhetao gneiss reservoirs have the characteristics of shallow burial, low temperature, low porosity and low permeability, natural fracture development, poor pore throat connectivity, and strong heterogeneity.During the process of reservoir reconstruction, there are risks of sand adding difficulty, fracture height out of control, and fracturing fluid difficult to break the gel.According to the above difficulties, a reservoir transformation process technology has been formed in which hydraulic fractures communicate with natural fractures, multi-fracture extensions form fracture networks, and increase permeability and increase production, which combined with rock mechanics analysis and unconventional reservoir fracturing theory, and while supporting multi-scale fracture proppant, fracture height control and low-temperature gel breaking technology.This technology has been successfully applied to 3 wells in gneiss fractured reservoirs in the Bayanhetao basin.The oil production is 10.50-27.96 m³/d, with an average oil production of 19.83 m³/d after fracture operation.This has important reference significance for later exploration and development of gneiss fractured reservoirs in Bayanhetao basin.