Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate
2006-11-09
2008-12-16
Bagnell, David J. (Department: 3676)
Boring or penetrating the earth
Automatic control
Of fluid pressure below ground
C175S024000, C175S026000, C175S061000, C175S092000
Reexamination Certificate
active
07464770
ABSTRACT:
Aspects of this invention include a steering tool having a controller configured to provide closed-loop control of hydraulic fluid pressure. In one exemplary embodiment, closed-loop control of a system (reservoir) pressure may be provided. In another embodiment, closed-loop control of a blade pressure may be provided while the blade remains substantially locked at a predetermined position. Other exemplary embodiments may incorporate rule-based-intelligence such that pressure control thresholds may be determined based on various measured and/or predetermined downhole parameters. The invention tends to reduce the friction (drag) between the blades and the borehole wall and thereby also tends to improve drilling rates. Moreover, the invention also tends to improve the service life and reliability of downhole steering tools.
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Jones Stephen
Sugiura Junichi
Bagnell David J.
Harcourt Brad
PathFinder Energy Services, Inc.
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