1472 Figure 7 - Schematic diagram of gravity-driven slag removal shaft excavation using a pilot shaft type. 4. CONSTRUCTION OF AN INTEGRATED WELL-CONSTRUCTION TECHNOLOGY SYSTEM Based on geological assurance technologies such as geological exploration, formation structure, or physical modification, and through the analysis of pilot hole, pilot shaft, enlargement, and support technologies, as well as the optimized combination of different processes, a gravity-driven slag removal shaft-sinking technology suitable for different formation conditions and engineering applications has been constructed. The process system composition of various integrated well-construction technologies (Table 1) includes single-stage enlargement well-construction using a raise boring machine, reverse drilling wellconstruction using a raise boring machine, multiple enlargement well-construction using an upward raise boring machine, shaft-driven shaft enlargement well-construction using a shaft-driven slag removal system, and large-diameter shaft-construction using a pilot shaft with slag removal. Table 1 - Composition of the Integrated Well Completion Process System Process Name Work procedures Process combination Construction method name Raise drilling technology / / C. Raisedrill rig pilot hole drilling F. Raisehole drilling rig enlarge ment H. Temporar y anchorsprayed support from top to bottom L. Perman ent well wall constru cted by slipform ing from bottom to top. CFHL RB construction method（ Raise Boring） Directional reverse drilling technology A. Direction al pilot hole drilling using screw drill bit B. Enlargin g the pilot hole using a directio nal drilling rig D. Raise the drill pipe ABDFHL DRB construction method（ Directional Raise Boring） Rotary steerable drilling technology / / E. Rotary steerabl e borehol e drilling with a raise boring machin e EFHL RSDRB construction method（Rotary Steering Drilling and Raise Boring）
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