Research and application of surfactant fracturing fluid of sulfonic acid type

In order to synthesize a new kind of clean fracturing fluid, the method based on compounding of fatty acid methyl ester sulfonate (MES) and erucic acid amide propyl betaine is used, so as to obtain the fracturing fluid thickener MC-1. The performance tests on thickening property, shear property and temperature resistance of the fracturing fluid formed through crosslinking of MC-1 of which the mass fraction is 3% and KCl of which the mass fraction is 3% are carried out. The test results reveal that, under high shear, the viscosity of the system remains at 830 mPa·s; together with metallic ion, the clean fracturing fluid formed has relatively high temperature resistance, shear resistance, viscoelasticity, sand-suspending property and gel-breaking property; at the temperature of 90 ℃, the viscosity of the system can still reach 50 mPa·s. After the gel is broken by kerosene, the viscosity of the gel breaking fluid may become as low as 4.5 mPa·s. The field test has been carried out in Well Yan 238-1 and Well Yan 300, the oil production is higher than that of adjacent wells by 17.4 m3 and 4.7 m3 respectively, and the production-increasing effect is obvious.