Borehole drilling accident, drilling sticking occurred in Linhuan Mine of Huaibei Mining Group in 2020. CCTEG Xi 'an Research Institute actively provided technical support, carefully formulated the casing milling salvage scheme, and organized elite forces to rush to the scene to assist. Through effective organization and joint efforts, the casing milling operation succeed and 360 meter’s drilling tool and MWD equipment were successfully pulled out, which avoided nearly 2 million CNY economic losses for customers.
