Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Reexamination Certificate
2007-05-29
2007-05-29
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
C175S045000, C175S048000, C175S061000, C702S009000, C073S152210, C073S152430
Reexamination Certificate
active
11062299
ABSTRACT:
A method for communicating with a downhole tool located in a subterranean borehole is disclosed. Exemplary embodiments of the method include encoding data and/or commands in a sequence of varying drill string rotation rates and drilling fluid flow rates. The varying rotation rates and flow rates are measured downhole and processed to decode the data and/or the commands. In one exemplary embodiment, commands in the form of relative changes to current steering tool offset and tool face settings are encoded and transmitted downhole. Such commands may then be executed, for example, to change the steering tool settings and thus the direction of drilling. Exemplary embodiments of this invention advantageously provide for quick and accurate communication with a downhole tool.
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Jones Stephen
Sugiura Junichi
PathFinder Energy Services, Inc.
Thompson Kenneth
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