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The Imaging Resolution Effect of LWD Resistivity Imaging Tool Using Numerical Simulation MethodNormal access

Authors: J. Jing, Z. Kang, S. Ke, J. Jia and Y. Cai
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: Integrated Subsurface Studies - Carbonates and Geomechanics
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901118
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 946.91Kb )
Price: € 20

Summary:
The Logging While Drilling (LWD) resistivity imaging tool can be used in situations where the formation is very complex, such as carbonate and volcanic formation with fractures and caves. The geologic structure can be easily identified from the borehole resistivity images. However, few studies about the imaging resolution of LWD resistivity imaging tool have been reported to date, which hinders our understanding when we use the images data. In this study, we use the FEM theory and COMSOL Multiphysics software to investigate the effect of borehole environment on imaging resolution. In order to compare the imaging results, a small button electrode and a big button electrode are chosen during the simulation. The relationships between the imaging resolution and the mud resistivity, borehole diameter, and distance from the button to well wall are investigated. It is shown that the all the above mentioned factors control the imaging resolution, and the distance from the button to the borehole wall and borehole diameter are the main factors that determines the images results of the tool.


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