CORKSCREW EFFECT REDUCTION ON BOREHOLE INDUCTION MEASUREMENTS

摘要

In some embodiments, a multi-array induction method uses user selectable zoning of a borehole to generate an updated look-up table for borehole corrections based on averaged calipers for the borehole. One example method averages caliper data, defines a good zone of the borehole substantially unaffected by corkscrew borehole effect, defines a start depth and an end depth of a zone of the borehole affected by the corkscrew borehole effect, and averages the caliper data for each coil array to generate updated resistivity outputs RO, Rt, and Rf for further drilling of the borehole.

主权项

1. A method for reducing borehole corkscrew effect on array induction tool measurements, the method comprising:
defining a zone in a borehole unaffected by the corkscrew effect and a zone in the borehole affected by the corkscrew effect; averaging caliper data of the borehole for the zone in the borehole affected by the corkscrew effect; and updating previously measured formation resistivities based on the average caliper data.