AN INHOMOGENEOUS BACKGROUND BASED FOCUSING METHOD FOR MULTI-ARRAY INDUCTION MEASUREMENTS IN A DEVIATED WELL

摘要

In highly deviated wells (2) or when the relative dip angle between formation layering (4) and wellbore axis is large, array induction measurements exhibit erratic spikes, misleading curve separations, and inaccurate resistivity values, preventing log analysts (Fig. 3) from accurately evaluating invasion and formation resistivities. To address these problems, various correction methods and inversion techniques have been developed. The correction methods, however, only yield satisfactory results when the relative dip angle (205) is low to moderate, and inversion techniques are typically very time consuming.