Preparation and performance study of coated sand fracturing proppants based on three of resin.

Oil and gas resources are becoming increasingly difficult to extract owing to long-term exploitation. Therefore, hydraulic pressure technologies, such as fracturing proppants, are needed to stimulate production. In this study, the strength and corrosion resistance of quartz were increased by modifying quartz sand and preparing high-performance coated-sand-based oil-fracturing proppants. Although many resins play crucial roles in the process of preparing fracturing proppants, their performances differ considerably. Chemical structural compositions and microstructures were investigated through infrared spectroscopy and scanning electron microscopy. The modification mechanism of quartz sand and the bonding mechanism between quartz sand and different types of resin proppants were analyzed by systematically investigating the flexural strength, corrosion resistance of the proppants as a function of resin contents, and curing temperature. The results show that the performance of the coated proppants is superior to those of conventional quartz sand and ceramic proppants. The flexural strength of modified quartz sand improved by 5.3%. The best performance was obtained using an 8% polyimide resin film and a curing temperature of 180 °C, achieving a coated sand proppant with a breakage ratio of 2.89% under 55.2 MPa. [ABSTRACT FROM AUTHOR]