Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1983-07-06
1986-06-10
Karlsen, Ernest F.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324374, G01V 302, G01V 306, G01V 318
Patent
active
045945527
ABSTRACT:
In a well logging sonde having a sonde body and wall engaging pad, the sonde body comprises two conductive sections spaced from one another by an insulating section. The pad and sonde are maintained in a relative longitudinal position such that the focussing effect from the upper sonde section is relatively weak or negligible for current emitted from the lower pad face and relatively strong for current emitted from the upper pad face. The current is returned through the lower sonde section. Additionally, the current electrodes are provided with particular individual characteristics that are defined to optimize the signal-to-noise ratio of the respective measurements. The pad may be provided with voltage electrodes on a lower insulating region of its face to allow for correction of the measurements for the resistivity of the borehole mud. The pad may be provided with additional current electrodes by which the application of the pad to the borehole wall may be monitored.
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Grimaldi Pierre
Trouiller Jean C.
Karlsen Ernest F.
Schlumberger Technology Corporation
Snow Walter E.
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