Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate
2007-04-10
2007-04-10
Bates, Zakiya W. (Department: 3676)
Boring or penetrating the earth
Processes
Boring with specific fluid
C175S107000, C175S424000, C166S223000
Reexamination Certificate
active
10990757
ABSTRACT:
Rotary jetting tool including a rotor with axially-opposed pressure-balanced mechanical face seals. Vented upper mechanical face seal enables the rotor to be operated with the relativity low starting torque achievable using reaction forces from offset jets energized with a pressurized fluid. When rotor is displaced axially due to set-down conditions, a pressure chamber exerts a pressure imbalance on the rotor, forcing the rotor to return to a normal operating position. Alternate structure to achieve low starting torque includes a volume disposed adjacent to a lower mechanical face seal, the volume being coupled in fluid communication with the pressurized fluid. Mechanical face seal surfaces are fabricated from ultra-hard materials, such as tungsten carbide, silicon carbide, and diamond. A gage ring designed to ensure the jets remove all of the material from the gage of the protective housing before the tool can advance can be incorporated.
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Kolle Jack J.
Marvin Mark H.
Anderson Ronald M.
Bates Zakiya W.
Tempress Technologies, Inc.
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