ABSTRACT
The commonly used guanidine gum fracturing fluid has a cumbersome fluid preparation process, high residue content, severe formation damage; the high cost of VES fracturing fluid makes it not easy to be popularized on a large scale. To solve the above problems, the emulsion associating fracturing fluid, which can be diluted online, is prepared by emulsion polymer thickener LDF-1, anti-swelling agent LDF-2 and cleanup additive LDF-6. The formula of fracturing fluid is optimized, and the all-around performance of fracturing fluid is evaluated. The results show that the fracturing fluid has suitable temperature and shear resistance. Under the experimental conditions of 80°C and 170 s−1, the viscosity is still higher than 70 mPa/s after shearing for 60 min. In addition, this fracturing fluid also has good sand carrying and gel-breaking ability. The gel-breaking fluid has the characteristics of low damage to the natural core permeability of a low-permeability reservoir, which can meet the requirements of fracturing fluid performance in fracturing fluid construction.
