Drilling head for reboring a stuck valve

Details Drilling head for reboring a stuck valve Drilling head for reboring a stuck valve

2008-02-28

2011-10-25

Gay, Jennifer H (Department: 3676)

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

C166S055200, C175S403000, C408S068000, C408S208000, C408S214000, C408S227000

Reexamination Certificate

active

08042613

ABSTRACT:
A drilling head, method of drilling, and use of the drilling head, for reboring a stuck valve or drilling into the formation downhole and, in particular a drilling tool having a drilling head and a driving unit. The drilling head includes a hole saw beside a drill bit for cutting out a piece from the stuck valve. A drilling system includes the drilling tool and a driving tool for moving the drilling tool downhole.

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