Drilling a borehole

Details Drilling a borehole Drilling a borehole

2007-10-30

2007-10-30

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

C175S262000, C175S057000

Reexamination Certificate

active

10712924

ABSTRACT:
A method of drilling a borehole into a subsurface earth formation, using a tubular drill string which includes at its lower end a bottom hole assembly comprising a drill bit, a drill steering system, and a surveying system. The drill string includes a selectively closable passageway for passing an auxiliary tool from a first position interior of the drill string above the bottom hole assembly to a second position. In the second position, at least part of the auxiliary tool is exterior of the drill string below the bottom hole assembly. The drill string is progressed into the earth formation by drilling. When a tool operating condition is met the passageway is opened and the auxiliary tool is passed through the passageway from the first position to the second position, where the auxiliary tool is operated.

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Search Reported dated Nov. 13, 2003.

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