E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/25
E21B 7/24 (2006.01) E21B 31/00 (2006.01) E21B 47/02 (2006.01) E21B 47/14 (2006.01) E21B 47/18 (2006.01) G01V 1/52 (2006.01)
Patent
CA 1335283
Pressure variations are produced in a stream of drilling fluid in a drill string within a borehole by establishing a cyclic fluidic oscillation in the stream of drilling fluid in two outlet flows emerging from a Coanda type of fluidic oscillator and amplifying the oscillating flow of drilling fluid to establish a series of high pressure gradients in the drilling fluid by receiving a first outlet flow from the fluidic oscillator in a radial inlet of a fluidic vortex amplifier. The fluidic oscillator and amplifier are mounted in a bottom hole assembly of the drill string which carries a drill bit. A second outlet flow from the fluidic oscillator is received in a tangential inlet of the fluidic vortex amplifier, a flow from the central outlet of the fluidic vortex amplifier being directed towards the bottom of the borehole. A frequency of the pressure variation is tuned to a resonant frequency of the drill string by adjusting the rate of flow of drilling fluid through the fluidic oscillator and amplifier.
575138
Shell Canada Limited
Smart & Biggar
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