Deflecting and counterboring drilling tool

The invention relates to a deflecting and counterboring drilling tool which comprises a drilling tool body. The drilling tool body comprises a plurality of drill bits sequentially and vertically arranged from large to small. The adjacent drill bits are fixedly connected through connecting rods, and...

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Bibliographic Details
Main Authors BAO XINYI, SU GANG, YAO FENGLEI
Format Patent
LanguageChinese
English
Published 10.12.2014
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:The invention relates to a deflecting and counterboring drilling tool which comprises a drilling tool body. The drilling tool body comprises a plurality of drill bits sequentially and vertically arranged from large to small. The adjacent drill bits are fixedly connected through connecting rods, and the drill bit at the uppermost end is fixedly connected with a drill rod through a connecting sleeve. When the deflecting and counterboring drilling tool is used for drilling, due to the fact that the drill bit at the lowest end is small, the deflecting and counterboring drilling tool can carry out offset turning if the drilling tool encounters hard stratum points, the hard stratum points are avoided, accidents are avoided, drill bit damage and drill rod deformation are avoided, and work reliability and safety are improved.
Bibliography:Application Number: CN20141447539