E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/25
E21B 21/00 (2006.01) E21B 21/12 (2006.01) E21B 21/16 (2006.01) F04F 5/16 (2006.01) F04F 5/46 (2006.01)
Patent
CA 1054138
EDUCTOR APPARATUS HAVING AN ANNULAR VENTURI NOZZLE FOR VACUUM CIRCULATION IN DRILLING SYSTEM Abstract of the Disclosure. A drill system uses double walled concentric pipe and a drill bit attached at one end of the drill pipe and a power swivel at its upper end having means for applying compressed air to the outer annulus within the drill pipe and means for attaching a vacuum line to the center annulus of the drill pipe. A flexible hose attached to the vacuum portion of the drill pipe has an eductor assembly using compressed air to create a vacuum to remove the cuttings during the drilling operation. The eductor assembly includes an annulus nozzle surrounding a straight-through bore providing an obstruction-free passage for induced air and drill cuttings. Motivating air flowing through the nozzle passes through flow restriction, then diverging diffuser, to accelerate air to supersonic velocity. A diverting valve, havings its input connected to pressurized air from an air compressor, has one output connected to the input of the inductor and its other output connected to the outer annulus portion of the drill pipe. The diverter valve provides the operator the ability to pressure reverse circulate, to vacuum reverse circulate, or an infinitely variable combina- tion of the two.
244617
Berriman Lester P.
Crow Morgan L.
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