Method and device for reducing the hook load of a drill pipe
摘要
In a method for reducing the hook load of a drill pipe operated in a flushing fluid according to the cable core drilling method, the drill pipe is on the one hand closed at a distance from its upper end, e.g. in the region of the core pipe, and on the other hand partially freed from the flushing fluid on the inside.
申请公布号
DE3517139(C1)
申请公布日期
1986.02.13
申请号
DE19853517139
申请日期
1985.05.11
申请人
BERGBAU-BOHRGESELLSCHAFT RHEIN-RUHR MBH, 4350 RECKLINGHAUSEN, DE
发明人
SPARENBERG, HEINRICH, 4235 SCHERMBECK, DE;KOEHLER, THEODOR, 4300 ESSEN, DE
