Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Reexamination Certificate
2006-11-28
2006-11-28
Wong, Albert K. (Department: 2612)
Communications: electrical
Wellbore telemetering or control
Selective control of subsurface equipment
C367S082000, C375S354000, C709S248000, C713S400000
Reexamination Certificate
active
07142129
ABSTRACT:
A method and system for use in synchronizing at least two clocks in a downhole network are disclosed. The method comprises determining a total signal latency between a controlling processing element and at least one downhole processing element in a downhole network and sending a synchronizing time over the downhole network to the at least one downhole processing element adjusted for the signal latency. Electronic time stamps may be used to measure latency between processing elements. A system for electrically synchronizing at least two clocks connected to a downhole network comprises a controlling processing element connected to a synchronizing clock in communication over a downhole network with at least one downhole processing element comprising at least one downhole clock. Preferably, the downhole network is integrated into a downhole tool string.
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Galison, Peter, “Einstein's Clocks, Poincare's Maps : Empires of Time” W.W. Norton & Company, 2003, p. 14-23.
Bartholomew David B.
Hall David R.
Johnson Monte
Koehler Roger O.
Moon Justin
Daly Jeffrey E.
IntelliServ, Inc.
Wilde Tyson J.
Wong Albert K.
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