关键词: 反井钻机, 萤石矿, 盲电梯井, 复杂地层

Abstract: The construction of blind elevator shaft in deep fluorite mine often needs to cross complex strata such as kaolinization alteration zone，fault breccia zone and soft-hard interbedded strata，which is faced with the technical problems of high construction risk，low efficiency and difficult control of well quali⁃ ty. Based on the blind elevator shaft project at the elevation of 1 323~1 423 m in No. IV ore body of a typical hydrothermal filling fluorite mine，the construction technology of AT-3000 L high torque anti-well drilling rig was systematically studied，and the integrated technical route of“ine geological modeling-risk pre-iden⁃ tification-dynamic process control”was proposed. In the pilot hole stage，the return slag is collected every 2~3 m for rapid lithology identification，the formation model is corrected in real time，and the drilling pres⁃ sure，rotation speed and mud performance are dynamically adjusted. In the reaming stage，differentiated sta⁃ bility control modes such as“low drilling pressure，low rotation speed and large displacement”are imple⁃ mented for different unfavorable geological bodies. The engineering implementation results show that the de⁃ viation rate of the pilot hole is controlled at 0.38‰，and the deviation rate of the well after reaming is 0.45‰，which is far better than the design standard of 1.0‰. Zero safety accident in the whole construction process .The total construction period is 45 days，which is 65.38% shorter than that of the traditional drill⁃ ing and blasting method，and the construction efficiency is 2.88 times that of the drilling and blasting meth⁃ od. The maximum deviation of wellbore diameter is -35~+42 mm，which meets the design requirements of ±50 mm. The research results can provide a replicable technical path for the safe and efficient construction of deep shafts under complex geological conditions，and have important practical significance for promoting the mechanization and intelligent development of mine engineering.

Key words: anti-well drilling rig, fluorite mine, blind elevator shaft, complex strata