Fundamentals of coaxial and coplanar coil arrays in induction tools

Detalhes bibliográficos
Autor(a) principal: Carvalho,Paulo Roberto de
Data de Publicação: 2010
Outros Autores: Santos,Walleson Gomes dos, Régis,Cícero Roberto Teixeira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Brasileira de Geofísica (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2010000100002
Resumo: Until about ten years ago, all commercial borehole induction devices were built up with the traditional coaxial coil arrays. Since then, those apparatus incorporated the unconventional coplanar coil arrays, in order to investigate thinly laminated reservoirs and to locate axially asymmetrical anomalies like vugs and fractures. In order to comprehend the fundamentals of the coplanar array in induction probes, we present a comparative study with the coaxial array through one-dimensional modeling of some borehole environments, like: 1) homogeneous, isotropic and unlimited conducting media; 2) invaded thick bed with annulus; 3) horizontal and dipping multilayer sequences; 4) gradational transition zone between two thick beds; and 5) thinly laminated formations. The comparative study allows us to conclude that: 1) the skin effect is strongest in the coplanar array responses; 2) the coplanar array responses are more sensitive to mud filtrate invasion and annulus zones, which are direct indicators of movable oil; 3) polarization "horns" on the coplanar array profiles can be good bed boundary indicators; 4) coplanar arrays present the greatest sensitivity to detect and delineate thinly laminated reservoirs.
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spelling Fundamentals of coaxial and coplanar coil arrays in induction toolswell logginginduction toolsthinly reservoirscoplanar arrayUntil about ten years ago, all commercial borehole induction devices were built up with the traditional coaxial coil arrays. Since then, those apparatus incorporated the unconventional coplanar coil arrays, in order to investigate thinly laminated reservoirs and to locate axially asymmetrical anomalies like vugs and fractures. In order to comprehend the fundamentals of the coplanar array in induction probes, we present a comparative study with the coaxial array through one-dimensional modeling of some borehole environments, like: 1) homogeneous, isotropic and unlimited conducting media; 2) invaded thick bed with annulus; 3) horizontal and dipping multilayer sequences; 4) gradational transition zone between two thick beds; and 5) thinly laminated formations. The comparative study allows us to conclude that: 1) the skin effect is strongest in the coplanar array responses; 2) the coplanar array responses are more sensitive to mud filtrate invasion and annulus zones, which are direct indicators of movable oil; 3) polarization "horns" on the coplanar array profiles can be good bed boundary indicators; 4) coplanar arrays present the greatest sensitivity to detect and delineate thinly laminated reservoirs.Sociedade Brasileira de Geofísica2010-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2010000100002Revista Brasileira de Geofísica v.28 n.1 2010reponame:Revista Brasileira de Geofísica (Online)instname:Sociedade Brasileira de Geofísica (SBG)instacron:SBG10.1590/S0102-261X2010000100002info:eu-repo/semantics/openAccessCarvalho,Paulo Roberto deSantos,Walleson Gomes dosRégis,Cícero Roberto Teixeiraeng2010-12-01T00:00:00Zoai:scielo:S0102-261X2010000100002Revistahttp://www.scielo.br/rbgONGhttps://old.scielo.br/oai/scielo-oai.php||sbgf@sbgf.org.br1809-45110102-261Xopendoar:2010-12-01T00:00Revista Brasileira de Geofísica (Online) - Sociedade Brasileira de Geofísica (SBG)false
dc.title.none.fl_str_mv Fundamentals of coaxial and coplanar coil arrays in induction tools
title Fundamentals of coaxial and coplanar coil arrays in induction tools
spellingShingle Fundamentals of coaxial and coplanar coil arrays in induction tools
Carvalho,Paulo Roberto de
well logging
induction tools
thinly reservoirs
coplanar array
title_short Fundamentals of coaxial and coplanar coil arrays in induction tools
title_full Fundamentals of coaxial and coplanar coil arrays in induction tools
title_fullStr Fundamentals of coaxial and coplanar coil arrays in induction tools
title_full_unstemmed Fundamentals of coaxial and coplanar coil arrays in induction tools
title_sort Fundamentals of coaxial and coplanar coil arrays in induction tools
author Carvalho,Paulo Roberto de
author_facet Carvalho,Paulo Roberto de
Santos,Walleson Gomes dos
Régis,Cícero Roberto Teixeira
author_role author
author2 Santos,Walleson Gomes dos
Régis,Cícero Roberto Teixeira
author2_role author
author
dc.contributor.author.fl_str_mv Carvalho,Paulo Roberto de
Santos,Walleson Gomes dos
Régis,Cícero Roberto Teixeira
dc.subject.por.fl_str_mv well logging
induction tools
thinly reservoirs
coplanar array
topic well logging
induction tools
thinly reservoirs
coplanar array
description Until about ten years ago, all commercial borehole induction devices were built up with the traditional coaxial coil arrays. Since then, those apparatus incorporated the unconventional coplanar coil arrays, in order to investigate thinly laminated reservoirs and to locate axially asymmetrical anomalies like vugs and fractures. In order to comprehend the fundamentals of the coplanar array in induction probes, we present a comparative study with the coaxial array through one-dimensional modeling of some borehole environments, like: 1) homogeneous, isotropic and unlimited conducting media; 2) invaded thick bed with annulus; 3) horizontal and dipping multilayer sequences; 4) gradational transition zone between two thick beds; and 5) thinly laminated formations. The comparative study allows us to conclude that: 1) the skin effect is strongest in the coplanar array responses; 2) the coplanar array responses are more sensitive to mud filtrate invasion and annulus zones, which are direct indicators of movable oil; 3) polarization "horns" on the coplanar array profiles can be good bed boundary indicators; 4) coplanar arrays present the greatest sensitivity to detect and delineate thinly laminated reservoirs.
publishDate 2010
dc.date.none.fl_str_mv 2010-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2010000100002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2010000100002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0102-261X2010000100002
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Geofísica
publisher.none.fl_str_mv Sociedade Brasileira de Geofísica
dc.source.none.fl_str_mv Revista Brasileira de Geofísica v.28 n.1 2010
reponame:Revista Brasileira de Geofísica (Online)
instname:Sociedade Brasileira de Geofísica (SBG)
instacron:SBG
instname_str Sociedade Brasileira de Geofísica (SBG)
instacron_str SBG
institution SBG
reponame_str Revista Brasileira de Geofísica (Online)
collection Revista Brasileira de Geofísica (Online)
repository.name.fl_str_mv Revista Brasileira de Geofísica (Online) - Sociedade Brasileira de Geofísica (SBG)
repository.mail.fl_str_mv ||sbgf@sbgf.org.br
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