Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Reexamination Certificate
2011-07-19
2011-07-19
Edwards, Jr., Timothy (Department: 2612)
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
C340S853300, C340S855800, C340S855900
Reexamination Certificate
active
07982633
ABSTRACT:
A data communication system for use in downhole applications wherein electrical energy is supplied over a multiple-conductor power cable to an ESP motor assembly. A downhole unit is AC-coupled to the conductors of the power cable through the wye point of the ESP motor assembly. A surface unit is AC-coupled to the conductors of the power cable. Uplink communication of telemetry data occurs over an AC communication scheme supported by the downhole unit and the surface unit. Downlink communication of remote control command data occurs over a different AC communication scheme supported by the surface unit and the downhole unit. These AC communication schemes provide an independent supply of power to the downhole environment. All communication between the surface and downhole environment is accomplished through the power cable without the use of additional communication lines. Data communication is maintained in the event of a ground fault on the power cable.
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Booker John
Freer John
Edwards, Jr. Timothy
McGoff Kevin B.
Osha & Liang LLP
Schlumberger Technology Corporation
Warfford Rodney V.
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