E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/2
E21B 47/00 (2006.01) E21B 17/02 (2006.01) E21B 47/12 (2006.01)
Patent
CA 1205376
"Apparatus for, and a Method of, Signalling within a Borehole while Drilling" ABSTRACT OF THE DISCLOSURE A telemetry sub for a drill string comprises upper and lower portions electrically insulated from one another by an insulator. The sub incorporates a transformer having its secondary connected between the upper portion and the lower portion. In operation a measurement data signal in the form of pulses is supplied to the primary of the transformer by suitable electronic circuitry and a pulsating current signal is thereby induced in the secondary. This pulsating signal is passed along the drill string towards the surface, a return path for the signal being provided by the earth formations through which the borehole is drilled. The signal is passed to a receiving station on the surface either directly or by way of one or more repeater subs of the same general construction as the aforementioned sub. Such a system is capable of transmitting signals at a high rate and with an acceptable signal-to-noise ratio. Furthermore the subs are relatively inexpensive to produce so that a large number of repeater subs may be distributed along the drill string if desired.
376546
Russell Anthony W.
Russell Michael K.
Halliburton Energy Services Inc.
Nl Sperry-Sun Inc.
Robic Robic & Associes/associates
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