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Triaxial induction tool with electrode sleeve: FD modeling in 3D geometries
Authors:Sofia Davydycheva  Dean Homan  Gerald Minerbo
Affiliation:1. Schlumberger, Permanently at: 4723 Castlewood, Sugar Land, TX 77479, United States;2. Schlumberger, SPC, 110 Schlumberger Dr., Sugar Land, TX 77478, United States;1. Optical and Semiconductor Devices Group, EEE Department, Imperial College London, Exhibition Road, London SW7 2AZ, UK;2. Department of Radiology, Imperial College NHS Trust, Praed Street, Paddington, London W2 1NY, UK;1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. Changzhou Institute of Energy Storage Materials & Devices, Changzhou 213022, China;3. The University of the Chinese Academy of Sciences, Beijing 100039, China;1. CSIRO Earth Science and Resource Engineering, Kensington, WA 6151, Australia;2. Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA;3. Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA, USA;4. CSIRO Earth Science and Resource Engineering, Clayton South, VIC 3169, Australia;1. Department of Industrial and Systems Engineering, 96 Frelinhuysen Road, CoRE Building 212, Piscataway, NJ 08854, United States;2. Department of Energy and Resources Engineering, Peking University, Beijing 100871, China;1. Department of Communication Engineering, Nanjing University of Science and Technology, Nanjing, China;2. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
Abstract:We have developed a finite-difference (FD) method to model the response of a multiple-spacing triaxial array induction tool with a multiple-electrode type sleeve. The FD software was verified versus two other independent modeling methods. The model response was checked for the FD grid refinement, while attempting to minimize run time. Many details of the electrode-sleeve geometry were studied using this method that led to the final electrode-sleeve design. The electrode sleeve reduces the response of the transverse couplings to eccentering in a conductive borehole. Quantitative agreement was found between the measurements and calculations. Using the FD software we study the tool response to various effects of 3D geometry.
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