Methods and systems for drilling auxiliary holes

Details Methods and systems for drilling auxiliary holes Methods and systems for drilling auxiliary holes

2008-01-17

2009-12-29

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Processes

C175S052000, C175S085000, C175S162000, C175S203000, C173S141000

Reexamination Certificate

active

07637329

ABSTRACT:
Systems and methods for drilling auxiliary holes such as conductor holes, ratholes, and mouseholes useful in drilling operations. The systems and methods include the use of a portable drilling apparatus that is selectively mountable on a rig's drill floor and is removable after an auxiliary hole has been drilled. A movable drive unit is pulled down by a cable system forcing the drive unit down and thereby facilitating drilling of the auxiliary hole.

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