Magnetic current excitation simulation and image enhancement methods for logging while drilling resistivity imaging tools
This paper proposes using magnetic current excitation instead of a circular coil as the excitation source to simulate the response of drilling electrical resistivity imaging tool(REIT)and investigates the detection characteristics of drilling elec-trical imaging logging tools.Building on this,environmental correction methods are developed to obtain clearer and enhanced images.The study constructs an instrument response function library by varying the eccentricity,formation electrical parame-ters,and borehole parameters.A rapid method is used to invert the eccentricity,followed by borehole environment correction and software aggregation enhancement to improve the image quality.Instrument eccentricity affects the button electrode differ-ently,impacting the aggregation effect of the electrode plate and resulting in issues like unclear images,loss of texture de-tails,and poor image balance.The proposed method corrects the original electrical signals in the borehole environment and enhances the images,effectively mitigating the influence of the borehole environment on measurements.This approach is sig-nificant for formation evaluation in imaging logging and for geological guidance in electrical imaging while drilling.
electrical imaging while drillinginversioneccentricityenvironmental correctionimage enhancement
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