Three New Fracturing Fluid Systems Under the New Situation of Reservoir Reconstruction

Abstract

AbstractFracturing is an important measure to increase production of oil and gas reservoirs, and fracturing fluid is a necessary construction material for fracturing. In recent years, the depth of reservoir reconstruction is getting deeper and deeper, the temperature of reservoir reconstruction is getting higher and higher, there are more and more unconventional reservoir horizontal well fracturing, and the price of crude oil is getting lower and lower. To adapt to the new situation, fracturing fluid is developing in the direction of heavier proportion, higher temperature resistance, and cheaper cost New liquid systems such as low concentration variable viscosity slippery water have been rapidly applied. Under the experimental conditions of 240 ℃ and 100 s−1, the viscosity of ultra-high temperature fracturing fluid keeps above 100 MPa · s after shearing for 2 h; The weighted density of CaCl2 weighted fracturing fluid is 1.35 g/cm3. Under the experimental conditions of 170 ℃ and 100 s−1, the viscosity of fracturing fluid is more than 200 MPa · s after shearing for 2 h; The viscosity of low concentration variable viscosity slick water is 1.83 MPa · s at 0.01% and 31.52 MPa · s at 0.1%. The above fracturing fluid has been widely used in the oilfield, which meets the technical requirements of reservoir reconstruction while achieving the goals of high quality, low damage and low cost. Fracturing is an important measure to increase production of oil and gas reservoirs, and fracturing fluid is a necessary construction material for fracturing. In recent years, the depth of reservoir reconstruction is getting deeper and deeper, the temperature of reservoir reconstruction is getting higher and higher, there are more and more unconventional reservoir horizontal well fracturing, and the price of crude oil is getting lower and lower. To adapt to the new situation, fracturing fluid is developing in the direction of heavier proportion, higher temperature resistance, and cheaper cost New liquid systems such as low concentration variable viscosity slippery water have been rapidly applied. Under the experimental conditions of 240 ℃ and 100 s−1, the viscosity of ultra-high temperature fracturing fluid keeps above 100 mPa · s after shearing for 2 h; The weighted density of CaCl2 weighted fracturing fluid is 1.35 g/cm3. Under the experimental conditions of 170 ℃ and 100 s−1, the viscosity of fracturing fluid is more than 200 MPa · s after shearing for 2 h; The viscosity of low concentration variable viscosity slick water is 1.83 MPa · s at 0.01% and 31.52 MPa · s at 0.1%. The above fracturing fluid has been widely used in the oilfield, which meets the technical requirements of reservoir reconstruction while achieving the goals of high quality, low damage and low cost.KeywordsUltra high temperature fracturing fluidWeighting fracturing fluidVariable viscosity slippery waterReservoir modification