Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission
Reexamination Certificate
2005-11-28
2008-12-23
Edwards, Jr., Timothy (Department: 2612)
Communications: electrical
Wellbore telemetering or control
Pulse or digital signal transmission
C367S083000, C367S084000, C175S040000, C175S045000
Reexamination Certificate
active
07468679
ABSTRACT:
An apparatus for mud pulse telemetry for transmitting information from a drill string positioned at a down hole location in a bore hole to a surface location, the drill string having a flow passage through which a drilling fluid flows is provided. In one aspect, the apparatus includes a rotor pulser having an uncompensated drive train comprising a unique uncompensated seal comprising a stacked array of seal elements. The uncompensated drive train provides for the direct coupling of a rotor to a drive motor. The drive motor is located within an internal housing that is filled with gas at atmospheric pressure. Additionally, a method of operating the apparatus is provided. The method includes measuring drilling fluid pressure within the flow passage to determine when a pipe connection is being made to the drill string to initiate the measurement of a down hole parameter. The down hole parameter information is transmitted to the surface through a series of encode pressure pulse generated in the drilling fluid.
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Edwards, Jr. Timothy
Lewellyn Stephen
Maxey Brittany J.
Maxey Law Offices, PLLC
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