The Gaojiabu Mine in the Binchang mining area is located in the middle of the Huanglong Jurassic Coalfield. The main coal seam is overlaid by the Luohe Formation sandstone aquifer， which is characterized by great thickness， low permeability and uneven water abundance. As the mining depth increases， water hazards in the mine seriously threaten safe production. The existing drainage system is unable to meet the demand and needs to be expanded. Therefore， a centralized drainage system was constructed， in which large-diameter drainage boreholes were implemented， with a borehole diameter of ?950mm and a depth of 810m. A novel method was adopted to fabricate the casing cement buoyancy plug using “casing inner diameter reducer+welded threaded steel ring+prefabricated steel hook”， and 378.8t of drainage pipelines were installed. During the construction in this area， complex geological conditions were encountered， and accidents such as borehole collapse， and stuck pipe due to hole shrinkage were prone to occur. The construction passed through the thick Luohe Formation sandstone aquifer with poor rock drillability in some sections， resulting in low drilling efficiency and high overall project difficulty. To address these issues， this paper proposed targeted solutions such as controlling drilling fluid loss， optimizing drilling assembly， and maintaining drilling fluid performance， which achieved good practical application results and provided a feasible solution for water hazard prevention and control in the mining area.