E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/12 (2006.01)
Patent
CA 2675783
A telemetry tool is placed adjacent to a drill bit. The telemetry tool includes position and direction sensors, a power supply, a signal receiver and a signal emitter. An external base unit mounted at the surface generates, and transmits into the geological formation, a carrier signal. The base unit also has a receiving unit. The geological formation provides a large current path between the signal generator and the downhole end of the drill string. The drill string defines a relatively low resistance conductor for the return signal. Thus a circuit is established from the base unit, through the geological formation to the telemetry unit, and back up the drill string to end back at the base unit. The telemetry unit superimposes a time varying signal on the carrier current. That signal includes a recognition sequence, followed by a data string. The data string may include information pertaining to compass direction, azimuth dip, rotational speed, acceleration in any of three axes. The base unit strips the signal off the carrier current, and reads the code.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Zientarski Mariusz Thomas
LandOfFree
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