Study on Filtration and Damage Characteristics of Modified Dry CO2 Fracturing Fluid in Shale Gas Reservoir

Abstract

Abstract. The filtration and damage characteristics of modified dry CO 2 fracturing fluid in the shale is studied in this paper. The results show that the modified dry CO 2 fracturing fluid has good leak-off characteristics. Compared with liquid CO 2 , supercritical CO 2 has a better permeation and diffusion capacity in the porous medium. The damage rate of the modified dry CO 2 fracturing fluid to shale core is only between 0.63%~3.84% with obvious little damage. Under liquid conditions, the increase of temperature makes the fracturing fluid more harmful to shale formation.