This paper presents a new real-time borehole effect correction scheme designed specifically for processing multi-component array induction logging data. This algortihm consists of the following steps: reading raw data and preprocessing, estimating tool eccentricity azimuthal angle, inverting the unknown model parameters, correcting the borehole effects, and generating the borehole corrected results. The inversion of the modeled parameters is the key component of the correction scheme. The inversion algorithm converts the inversion problem of one high-dimensional unknown vector into several lower-dimension vectors, this separation is based on their sensitivity to various components of the measured conductivity tensor for the different sub-arrays. This dimensionality reduction makes the borehole correction inversion simpler, and more reliable. Because the three-dimensional simulation of a multi-component induction is a very time consuming process, the forward modeling used in the inversion is based on a pre-calculated look-up table. Hence, the inversion is fast, and the borehole correction processing can be applied in real time or at the well site. To validate the new borehole correction scheme, synthetic multi-component induction log data is processed using this new scheme. The obtained borehole corrected log results demonstrate its reliability and effectiveness.
展开▼
