Valve method for drilling with casing using pressurized...

Details Valve method for drilling with casing using pressurized... Valve method for drilling with casing using pressurized...

2006-11-28

2006-11-28

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With valve

C175S318000, C175S071000, C166S087100, C166S077510

Reexamination Certificate

active

07140455

ABSTRACT:
A valve (30), a drill string valve assembly (10) and a method of drilling using compressed fluid as a drill drilling fluid are described. The valve and valve assembly (10) may be used in order to prevent escape of compressed fluid during the time that a connection is being made into the drill string. The valve (10) can be insertable into a drill string inner diameter to seal against fluid passage past the body except through the valve (30) and can be selected to maintain fluid pressure in the drill string when the upper end of the drill string is open to atmosphere. The valve can also be capable of being releasably engaged to a drive mechanism, such as a top drive (40) which is handling the drill string (12) to be slidably moved within the drill string, as driven by the drive mechanism, but releasable from the drive mechanism, when the drive mechanism is removed from the drill string.

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