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AssigneeBaker Hughes Incorporated
InventorsLeonty A. Tabarovsky, Michael Boris Rabinovich, David R. Beard
Estimating the term…
An induction logging tool is used in an inclined borehole for determining properties of subsurface formations formation away from the borehole. Measurements are made at a plurality of transmitter-receiver (T-R) distances. After correction of the data for skin effects and optionally correcting for eddy currents within the borehole, the shallow measurements (those from short T-R spacing or from high frequency data) are inverted to give a model of the near borehole (invaded zone resistivity and diameter) and the resistivity of the formation outside the invaded zone. Using this model, a prediction is made of the data measured by the mid-level and deep sensors (long T-R spacings). A discrepancy between these predicted values and the actual measurements made by the midlevel and deep sensors is indicative of additional layer boundaries in the proximity of the wellbore.
A method of logging earth formations penetrated by a borehole using a well logging instrument conveyed therein, the method comprising:
A method of determining a distance to at least one bed boundary in earth formations penetrated by a near horizontal borehole using an induction logging instrument conveyed therein, the method comprising:
A method of determining a distance to at least one bed boundary in earth formations penetrated by a near horizontal borehole using an induction logging instrument conveyed therein, the method comprising:
Dependencies are inferred from the claim text.