Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1991-04-16
1994-10-11
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
364422, G01V 318
Patent
active
053550889
ABSTRACT:
A system receives output signals from a well tool disposed in a wellbore and generates a set of invasion parameters associated with a transition zone of a formation traversed by the wellbore, the parameters being used to plot a more accurate resistivity log on an output record medium. The invasion parameters include Rxo, the flushed zone resistivity; Rt, the uninvaded zone resistivity; and two other parameters not previously known, the "w" parameter and the "N" parameter, where "w" represents the midpoint of the transition zone region on the resistivity log and "N" represents a value related to the slope of the resistivity log in the transition zone region. Given the four parameters, Rxo, Rt, w, and N, a more accurate and improved resistivity log is illustrated on an output record medium, one which reflects a gradual, and not an abrupt, change in the resistivity in the transition zone portion of the log.
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Bouchard John H.
Garrana Henry N.
Schlumberger Technology Corporation
Snow Walter E.
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