【文章摘要】 Frac sand is composed mainly of quartz grains. It is used in the fracking process, hence the name "frac" sand. The sand is entrained in water and is pumped under great pressure into fractures created in the reservoir rock. The sand is packed tighdy into the fractures and props them open, hence they are also referred to as "proppants". This forms a permeable pathway for the oil and gas to escape from otherwise impermeable rock formations, such as shale. |