Signalling method and apparatus

Details Signalling method and apparatus Signalling method and apparatus

2003-10-22

2008-11-04

Neuder, William P (Department: 3672)

Wells

Processes

With indicating, testing, measuring or locating

C166S066000

Reexamination Certificate

active

07445042

ABSTRACT:
At least one three phase driven pumps (56) in a hydrocarbon well (10) well bore (12) uses frequency shift keyed digital signals (78) to pass instructions from a surface station (46, 26, 34, 30) to a tool (14, 76, 56) and reports from a tool (14, 76, 56) to the surface station (46, 26, 34, 30) in common mode through the three phase cables (16) using a star point (58) of the three phase cables (16) after each pump as the signal transmission and reception point and as the point for coupling a DC Power supply (28), also provided in common mode on the three phase cables (16), to the down hole electronic equipment (72 76). The surface equipment (46) and the tool (14) use as a common ground. The digital messages comprises an address portion (80) identifying either the tool (14) for which an instruction (82) is destined or the tool (14) from which a report (also82) originates. The digital message (18) also comprises a checksum (84) for error identification and correction.

REFERENCES:
patent: WO 99/36802 (1999-07-01), None

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