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Electromagnetic Fields in a Non-Uniform Steel-Cased WellNormal access

Authors: H.J. Kim and K.H. Lee
Event name: 66th EAGE Conference & Exhibition
Session: Wellbore Data Acquisition and Interpretation
Publication date: 07 June 2004
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 258.25Kb )
Price: € 20

G008 ELECTROMAGNETIC FIELDS IN A NON-UNIFORM STEEL-CASED WELL 1 ABSTRACT Since most oil wells are cased with steel pipes electromagnetic (EM) signals undergo a severe attenuation as they diffuse across the casing. This paper presents the effect of non-uniform casing properties on EM fields measured in a steel-cased well embedded in a layered formation. We use a finite-element method to compute secondary azimuthal electric fields for a cylindrically symmetric conductivity model while primary fields are analytically obtained for a homogeneous casing in a whole space. Although EM signals induced by a layered formation are greatly masked by the steel casing

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