E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/3
E21B 47/06 (2006.01) E21B 41/00 (2006.01) E21B 47/18 (2006.01)
Patent
CA 1205737
SPECIFICATION "Improvements in or Relating to Apparatus for Signalling within a Borehole while Drilling" ABSTRACT OF THE DISCLOSURE A down-hole signal transmitter for a mud pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud flow, a throttling member displaceable to vary the throughflow cross-section of the throttle orifice, and a pump for displacing the throttling member against the mud flow in order to modulate the mud flow. The displacement of the throttling member is con- trolled by a hydraulic amplifier, comprising a main pressure relief valve and a subsidiary control valve, and a solenoid to which the output signal of a measuring in- strument is supplied. When the main valve is closed, the pump displaces a ram coupled to the throttling member upwardly. However, when the signal supplied to the solenoid is such as to magnetically attract an armature, the control valve is opened to conduct a small flow of oil between the pump input and the pump output, and this in turn causes the main valve to open thus conducting a much larger flow of oil from the pump input to the pump output and allowing the throttling member to be displaced downwardly by the pressure of the mud flow. The power consumption required to modulate the mud flow with this arrangement is very low, and this is easily met by a down-hole electrical generator.
432078
Russell Anthony W.
Russell Michael K.
Nl Sperry-Sun Inc.
Robic Robic & Associes/associates
LandOfFree
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