Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1991-06-24
1993-08-31
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
175 50, 175 61, 324369, E21B 706, E21B 4900, G01V 330, G01V 334
Patent
active
052412733
ABSTRACT:
The disclosed method is applicable for use in conjunction with an earth borehole drilling apparatus that typically includes: a drilling rig; and a drill string operating from said drilling rig for drilling an earth borehole, the drill string including a bottom hole arrangement comprising a drill bit and a downhole resistivity measuring subsystem for measuring downhole formation resistivity near the bit by propagating electromagnetic energy into earth formations near the bit, receiving electromagnetic energy that has propagated through the formations and producing measurement signals that depend on the received signals. A method is set forth for directing the drilling of a well bore with respect to a geological bed boundary in the earth formations, including the steps of: producing from the measurement signals a recording of downhole formation resistivity as a function of position; determining the presence of a horn in the resistivity recording; and implementing a change in the drilling direction of the drill bit in response to said determination of the presence of a horn.
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Kanak Wayne I.
Novack Martin M.
Ryberg John J.
Schlumberger Technology Corporation
Strecker Gerard R.
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