Through many years of R&D, overcoming difficulties, underground hydraulic fracturing team of CCTEG Xi’an Research Institute innovated a complete set of weakening technology and equipment of advanced staged hydraulic fracturing in hard roof of underground coal mines. The technology has been successfully applied to multiple mines in Shendong Coal Mining Group. Super-long, precise and controllable hard roof weakening in advance has been realized. The application has helped achieving safe and efficient production in multiple working faces.
