The strength retrogression of special class Portland oilwell cement
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Cerâmica (São Paulo. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132011000200004 |
Resumo: | Temperatures in excess of 110 ºC result in phase transformations of cement, significantly decreasing its compressive strength. This effect is referred to as strength retrogression. It is frequently observed in cement sheaths of heavy oil wells submitted to steam injection. The present study evaluated the mechanical behavior of Special Class Portland Oilwell Cement (SCPOC) slurries containing silica flour to prevent retrogression. A factorial statistical planning was used to assess the effect of the main variables on the mechanical behavior of cement slurries, i.e., mechanical testing temperature (30, 100, 120, 180 and 230 ºC); contents of silica flour replacing cement (0-18 and 36%) and curing time for rupture (12 h and 7 days). The results revealed that slurries containing 18% of silica flour tested at 230 ºC depicted an increase in compressive strength up to 30% after curing for 12 h and 10% after curing for 7 days, indicating retrogression. On the other hand, testing slurries containing silica flour at temperatures up to 180 ºC revealed strength increase of just 10%, suggesting the mechanical stability of the SCPOC, which prevents retrogression. Such behavior was probably related to the relatively low content of C3A and low specific area of the material. Therefore, strength retrogression at typical bottom hole temperatures of up to 180 ºC can be controlled by small additions of silica flour, economically contributing to the use of SCPOC cementing. |
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The strength retrogression of special class Portland oilwell cementcharacterizationcrystal structureclinkeroil well cementTemperatures in excess of 110 ºC result in phase transformations of cement, significantly decreasing its compressive strength. This effect is referred to as strength retrogression. It is frequently observed in cement sheaths of heavy oil wells submitted to steam injection. The present study evaluated the mechanical behavior of Special Class Portland Oilwell Cement (SCPOC) slurries containing silica flour to prevent retrogression. A factorial statistical planning was used to assess the effect of the main variables on the mechanical behavior of cement slurries, i.e., mechanical testing temperature (30, 100, 120, 180 and 230 ºC); contents of silica flour replacing cement (0-18 and 36%) and curing time for rupture (12 h and 7 days). The results revealed that slurries containing 18% of silica flour tested at 230 ºC depicted an increase in compressive strength up to 30% after curing for 12 h and 10% after curing for 7 days, indicating retrogression. On the other hand, testing slurries containing silica flour at temperatures up to 180 ºC revealed strength increase of just 10%, suggesting the mechanical stability of the SCPOC, which prevents retrogression. Such behavior was probably related to the relatively low content of C3A and low specific area of the material. Therefore, strength retrogression at typical bottom hole temperatures of up to 180 ºC can be controlled by small additions of silica flour, economically contributing to the use of SCPOC cementing.Associação Brasileira de Cerâmica2011-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132011000200004Cerâmica v.57 n.342 2011reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0366-69132011000200004info:eu-repo/semantics/openAccessBezerra,U. T.Martinelli,A. E.Melo,D. M. A.Melo,M. A. F.Oliveira,V. G.eng2011-07-08T00:00:00Zoai:scielo:S0366-69132011000200004Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2011-07-08T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
The strength retrogression of special class Portland oilwell cement |
title |
The strength retrogression of special class Portland oilwell cement |
spellingShingle |
The strength retrogression of special class Portland oilwell cement Bezerra,U. T. characterization crystal structure clinker oil well cement |
title_short |
The strength retrogression of special class Portland oilwell cement |
title_full |
The strength retrogression of special class Portland oilwell cement |
title_fullStr |
The strength retrogression of special class Portland oilwell cement |
title_full_unstemmed |
The strength retrogression of special class Portland oilwell cement |
title_sort |
The strength retrogression of special class Portland oilwell cement |
author |
Bezerra,U. T. |
author_facet |
Bezerra,U. T. Martinelli,A. E. Melo,D. M. A. Melo,M. A. F. Oliveira,V. G. |
author_role |
author |
author2 |
Martinelli,A. E. Melo,D. M. A. Melo,M. A. F. Oliveira,V. G. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Bezerra,U. T. Martinelli,A. E. Melo,D. M. A. Melo,M. A. F. Oliveira,V. G. |
dc.subject.por.fl_str_mv |
characterization crystal structure clinker oil well cement |
topic |
characterization crystal structure clinker oil well cement |
description |
Temperatures in excess of 110 ºC result in phase transformations of cement, significantly decreasing its compressive strength. This effect is referred to as strength retrogression. It is frequently observed in cement sheaths of heavy oil wells submitted to steam injection. The present study evaluated the mechanical behavior of Special Class Portland Oilwell Cement (SCPOC) slurries containing silica flour to prevent retrogression. A factorial statistical planning was used to assess the effect of the main variables on the mechanical behavior of cement slurries, i.e., mechanical testing temperature (30, 100, 120, 180 and 230 ºC); contents of silica flour replacing cement (0-18 and 36%) and curing time for rupture (12 h and 7 days). The results revealed that slurries containing 18% of silica flour tested at 230 ºC depicted an increase in compressive strength up to 30% after curing for 12 h and 10% after curing for 7 days, indicating retrogression. On the other hand, testing slurries containing silica flour at temperatures up to 180 ºC revealed strength increase of just 10%, suggesting the mechanical stability of the SCPOC, which prevents retrogression. Such behavior was probably related to the relatively low content of C3A and low specific area of the material. Therefore, strength retrogression at typical bottom hole temperatures of up to 180 ºC can be controlled by small additions of silica flour, economically contributing to the use of SCPOC cementing. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-06-01 |
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=S0366-69132011000200004 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132011000200004 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0366-69132011000200004 |
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 |
Associação Brasileira de Cerâmica |
publisher.none.fl_str_mv |
Associação Brasileira de Cerâmica |
dc.source.none.fl_str_mv |
Cerâmica v.57 n.342 2011 reponame:Cerâmica (São Paulo. Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Cerâmica (São Paulo. Online) |
collection |
Cerâmica (São Paulo. Online) |
repository.name.fl_str_mv |
Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
ceram.abc@gmail.com||ceram.abc@gmail.com |
_version_ |
1748936781842087936 |