DRILLING HEAD, DRILLING TOOL, PERFORATION SYSTEM AND USING THE WELL BACKING DRILL HEAD

摘要

This invention refers to a perforation head (2) to cover a stuck valve or to drill into the formation of a well -bottomed valve. The invention also refers to a drilling tool (1) comprising a perforation head (2) and an actuamen unit Au (9). The perforation head (2) comprises a glass saw (28) in addition to a perforation drill (30) to cut a piece (37) of the stuck valve. In addition, the invention refers to a drilling system comprising the drilling tool (1) and an actuation tool (9) to move the drilling tool (1) at the bottom of the well; a drill method;And a use of the drill head.