Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1996-10-18
1998-05-19
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324371, G01V 324
Patent
active
057540500
ABSTRACT:
A method and apparatus for evaluating the geometrical characteristics of a well, comprising insertion of a sonde (12) of elongate shape into the well, the sonde including azimuth electrodes (A.sub.azi), an annular current electrode (A.sub.0), and at least one annular current return electrode (A). The annular current electrode (A.sub.0) emits a current I.sub.0, which flows essentially in a column of mud situated inside the well and returns to the annular current return electrodes. Signals induced in response to the current I.sub.0 are measured by the azimuth electrodes from which can be determined the geometrical characteristics of the well. An alternative embodiment includes an apparatus which is symmetrical about the azimuth electrodes.
REFERENCES:
patent: 5396175 (1995-03-01), Seeman
J. Suau et al., "The Dual Laterolog-R.sub.xo Tool" published in 47th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, SPE 4018, 1972, American Institute of Mining, Metallurgical and Petroleum Engineers Inc.
Smits Jan W.
Trouiller Jean Claude
Schlumberger Technology Corporation
Smith Keith G. W.
Strecker Gerard R.
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