Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1995-07-28
1998-02-10
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
G01V 320
Patent
active
057173346
ABSTRACT:
Methods and apparatus are described to produce stick-slip motion of a logging tool within a cased well attached to a wireline that is drawn upward by a continuously rotating wireline drum. The stick-slip motion results in the periodic upward movement of the tool in the cased well described in terms of a dwell time during which time the tool is stationary, the move time during which time the tool moves, and the stroke that is upward distance that the tool translates during the "slip" portion of the stick-slip motion. This method of measurement is used to log the well at different vertical positions of the tool. Therefore, any typical "station-to-station logging tool" may be modified to be a "continuous logging tool", where "continuous" means that the wireline drum continually rotates while the tool undergoes stick-slip motion downhole and measurements are performed during the dwell times when the tool is momentarily stationary. The stick-slip methods of operation and the related apparatus are particularly described in terms of making measurements of formation resistivity from within a cased well during the dwell times when the tool is momentarily stationary during the periodic stick-slip motion of the logging tool.
REFERENCES:
patent: 2397255 (1946-03-01), Ennis
patent: 2459196 (1949-01-01), Stewart
patent: 3568053 (1971-03-01), Kilpatrick
patent: 4251773 (1981-02-01), Cailliau et al.
patent: 4567759 (1986-02-01), Ekstrom et al.
Momii Steven Thomas
Vail III William Banning
O'Shea Sandra L.
ParaMagnetic Logging Inc.
Phillips Roger C.
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