Application of “Shell” Shaped Fisher in Drill Pipe Breaking Accidents

Abstract:

Because of the variety of stratigraphic types, broken rock mass formation and complex geological structure in Shaling goldfields of Laizhou, drill pipe breaking often occurs in small diamond drilling construction. Based on the investigation and analysis, a “shell” shaped fisher was developed, which is used for drill pipe or casing breaking accidents, the efficiency and effect of accident treatment are highly improved. The working principle and attentions in use are outlined in this paper and the existing problems and limitations are also pointed out.

Key words:small diameter deep hole drilling; drill pipe breaking accident; casing breaking accident; “shell” shaped fisher; Shaling goldfields