发明名称 EDUCTOR APPARATUS HAVING AN ANNULAR VENTURI NOZZLE FOR VACUUM CIRCULATION IN DRILLING SYSTEM
摘要 <p>EDUCTOR APPARATUS HAVING AN ANNULAR VENTURI NOZZLE FOR VACUUM CIRCULATION IN DRILLING SYSTEM. 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 combination of the two.</p>
申请公布号 CA1054138(A) 申请公布日期 1979.05.08
申请号 CA19760244617 申请日期 1976.01.30
申请人 DRESSER INDUSTRIES, INC. 发明人 CROW, MORGAN L.;BERRIMAN, LESTER P.
分类号 E21B21/12;E21B21/16;F04F5/16;F04F5/46;(IPC1-7):21B21/00 主分类号 E21B21/12
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