Construction Technology of 5# Rescue Hole in the Collapse Accident in Pingyi Gypsum Mine and the Drilling Tool Configuration

Abstract:

The paper gives an account of the construction process of 5# rescue hole in the collapse accident in Pingyi gypsum mine on Dec. 25, 2015. The application situation of RB-T90 drilling rig (made by Bauer of Germany) by Huainan rescue team of national mine emergency rescue organization matching with SG219/152 double-wall drill tools (made by Shijiazhuang Mineral Exploration Machinery Factory of the Land and Resources Exploration Center of Hebei Provincial Bureau of Geology and Mineral Resources) is introduced in detail, the formation conditions, borehole design, drilling tool configuration, construction process, difficulties encountered and the final solution are also stated.

Key words:air reverse circulation drilling; double-wall drill tool; drilling tool configuration; rescue by drilling hole; large diameter rescue hole; the collapse accident in Pingyi gypsum mine; mine disaster rescue