Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate
2006-03-28
2006-03-28
Ledynh, Bot (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
C324S339000
Reexamination Certificate
active
07019528
ABSTRACT:
A method and apparatus for use within a borehole for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. An antenna configuration in which a transmitter antenna and a receiver antenna are oriented in non-parallel planes such that the vertical resistivity and the relative dip angle are decoupled. Preferably, either the transmitter or the receiver is mounted in a conventional orientation in a first plane that is normal to the tool axis, and the other antenna is mounted in a second plane that is not parallel to the first plane. Also included are a method and apparatus for steering a downhole tool during a drilling operation in order to maintain the borehole within a desired earth formation. The steering capability is enabled by computing the difference or the ratio of the phase-based or amplitude-based responses of the receiver antennas which are mounted in planes that are not parallel to the planes of the transmitter antennas.
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Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Ledynh Bot
Whittington Kenneth J.
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