Sand blender:This proprietary blender is a pressurized system in which proppant is preloaded, purged and pressurized with the nitrogen. A controller uses a pressurized auger system to meter the proppant into the gelled LPG, creating a gelled LPG sand laden slurry to stimulate the reservoir.看样子貌似是通过液氮来加压冷却输送预装好的砂子。我觉得类似于二氧化碳干法压裂。