Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1997-05-14
1999-10-05
Patidar, Jay
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
G01V 318, G01V 312
Patent
active
059630361
ABSTRACT:
A method and apparatus is disclosed for determining the properties of formations surrounding an earth borehole that have been invaded by borehole fluid to form an invaded zone. Properties determined in one embodiment are invaded zone resistivity Rxo, diameter of invasion DI, and uninvaded formation resistivity Rt, and the following steps are performed: (a) suspending a logging device in the borehole; (b) transmitting electromagnetic energy from a transmitter location on the logging device, and receiving the transmitted electromagnetic energy at receiver locations on the logging device for a first transmitter-to-receivers spacing associated with the transmitter and receiver locations; (c) determining, from the received electromagnetic energy, measurement characteristics associated with the first transmitter-to-receivers spacing; (d) repeating steps (b) and (c) for a plurality of further transmitter-to-receivers spacings to obtain measurement characteristics for the plurality of further transmitter-to-receivers spacings; (e) generating a model of formation of resistivity Rt with an invaded zone of resistivity Rxo and diameter of invasion DI; (f) selecting values of Rxo, DI, and Rt that would produce model measurement characteristics that substantially correspond, for each of a plurality of the transmitter-to-receiver spacings, with the actual measurement characteristics for the respective plurality of transmitter-to-receiver spacings; and (g) outputting the selected model values of Rxo, DI, and Rt.
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Tabanou Jacques R.
Wu Peter T.
Jeffrey Brigitte L.
Kanak Wayne I.
Novack Martin
Patidar Jay
Schlumberger Technology Corporation
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