Boring or penetrating the earth – Miscellaneous
Reexamination Certificate
2006-08-01
2006-08-01
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Miscellaneous
C175S067000, C166S223000
Reexamination Certificate
active
07083011
ABSTRACT:
A fluid drilling head has a plurality of nozzles (3, 4, 5, 6) in a rotatable nozzle assembly (2) to provide high pressure cutting jets (7). The head is provided with a gauging ring (10) having an annular clearance (11) to the rotatable nozzle assembly (2) to provide for the passage of rock particles eroded by the cutting action of the jets (7) while regulating the progress of the drilling head in the borehole and controlling drill stalling. A stepped rotatable nozzle assembly having a smaller diameter portion (8) and a larger diameter portion (9) to extend the cutting zone of a reaming jet closer to the outer diameter of the gauging ring (10) is also described and claimed.
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Bagnell David
CMTE Development Limited
Collins G M
Perkins Coie LLP
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