The method of preparing ultra low density proppant a hydrocarbon well

The present invention discloses a method for preparing very low density proppant a hydrocarbon well. 1) The silica fume dispersed in an organic solvent, is heated to 80-95 deg.] C the reaction was added a silane coupling agent 1-3 h, then cooled to 50-65 deg.] C was added organic acids 1-3 h, cooled, suction filtered, and dried to obtain a modified silica fume; the modified silica fume was added to a solution of methyl methacrylate monomer and initiator mixture a crosslinking agent, water as a dispersant, suspending agent, synthesized by suspension polymerization composite microspheres, filtered, washed , drying, had a density of 15-60 mesh proppant at 1.119g / cm3 ~ 1.278g / cm3 of. Density close to water, oil mining, water or brine may be used as the carrier fluid, thereby significantly reducing the cost of construction fracturing, and energy conservation, avoiding the use of polymer additives guar gum and the like, to reduce pollution of the environment and improve economic efficiency.