Title:
Formation resistivity measurement while drilling, utilizing physical conditions representative of the signals from a toroidal coil located adjacent the drilling bit
United States Patent 3408561
US Patent References:
Well logging
- - 2389241

Well signaling system
- - 2411696

Apparatus for logging wells
- - 2524031

Measurement system
- - 2700131

Earth borehole investigation-signaling system
- - 2759143


Inventors:
Redwine, Fletcher H.
Osborn, William F.
Publication Date:
10/29/1968
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Assignee:
ARPS CORP
Primary Class:
324/342
International Classes:
E21B47/01; E21B47/18; G01V3/26; G01V3/28; E21B47/00; E21B47/12; G01V3/18
US Patent References:
2901685Apparatus for earth borehole investigating and signaling
2917704Earth formation logging system
3094658Logging system using electrostatically shielded coils




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