STUDY AND APPLICATION OF CLEAN FRACTURING FLUID IN CHINA

The carrying sands viscosity and the shearing resistance ability of clean fracturing fluid is strictly controlled by temperature.Its compatible temperature is under 80oC.The clean fracturing fluid is called viscoelastic surfactant fracturing fluids.The viscoelastic surfactant fracturing fluids has many excellencies:it does not contain polymers and not need crosslinking agent and gel breaker,its preparation is very simple and it can control the height of crevasses,its frictional resistance is only 25%-40% of water,its efficiency is high to 85%,its filter loss is low in low permeability reservoir of less than 5×10-3μm2 permeability,and its damage to reservoir is small,the effect of incremental output after the reservoir is fractured is higher than the guanidine fracturing fluid.The clean fracturing fluid can reduce operation cost,is the development direction of clean acidizing fluid.