oil well fracking

the ball is poor, thereby reducing the conductivity of cracks, particularly closure does not apply to high pressure The deep, oil well fracking with a composite resin coated quartz sand particles, the sphericity improved corrosion resistance can achieve higher targets, even if the internal quartz sand is crushed, outside coated resin layer can wrap pieces, keeping the crack diversion capacity, unconventional gas is a development direction proppant, but the current product shelf life is relatively short, the cost is also high, with a variety of different materials and manufacturing process of ceramic