Effect of casing imperfection on the casing strength in steam injection wells

In this study, effect of casing imperfection on the casing strength in thermal environment of steam injection wells was investigated. The imperfections were modelled in the form of casing pits which may represent local cavitation, wear or corrosion attacks. Several pits with various depths (C) relat...

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Main Authors: Hidayat, M.I.P., Irawan, S., Abdullah, M.Z.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19897 /
Published: Institute of Physics Publishing 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037734265&doi=10.1088%2f1757-899X%2f267%2f1%2f012019&partnerID=40&md5=1280bcb58598468f171e3ea23b946ce7
http://eprints.utp.edu.my/19897/
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spelling utp-eprints.198972018-04-22T13:14:40Z Effect of casing imperfection on the casing strength in steam injection wells Hidayat, M.I.P. Irawan, S. Abdullah, M.Z. In this study, effect of casing imperfection on the casing strength in thermal environment of steam injection wells was investigated. The imperfections were modelled in the form of casing pits which may represent local cavitation, wear or corrosion attacks. Several pits with various depths (C) relative to the casing thickness (t) and different casing diameter to thickness (D/t) ratios were considered in this study. For the purpose of investigation, 3D FE models consisting of defective casing-cement-formation system were developed. N80 casing with the casing length of 3.048 m is analyzed in the numerical study. In the analysis, the combined effects of cyclic thermal stress (from 25 °C to 360 °C), collapse pressure (from formation) and defects on casing were taken into account. From the numerical study, it is found that the casing imperfection greatly affected the casing strength in steam injection wells. The presence of pits markedly reduces the casing collapse strength in comparison to that of non-defective casing. For instance, the collapse strength of casing having 2 pits along its circumferential direction with depth C = 0.5t reduced about 49 and 43 for D/t = 22.09 and D/t = 17.26, respectively. In addition, the combination of high temperature, imperfection factor and formation pressure induces severe deformation on casing, even at lower formation pressure. © Published under licence by IOP Publishing Ltd. Institute of Physics Publishing 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037734265&doi=10.1088%2f1757-899X%2f267%2f1%2f012019&partnerID=40&md5=1280bcb58598468f171e3ea23b946ce7 Hidayat, M.I.P. and Irawan, S. and Abdullah, M.Z. (2017) Effect of casing imperfection on the casing strength in steam injection wells. IOP Conference Series: Materials Science and Engineering, 267 (1). http://eprints.utp.edu.my/19897/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description In this study, effect of casing imperfection on the casing strength in thermal environment of steam injection wells was investigated. The imperfections were modelled in the form of casing pits which may represent local cavitation, wear or corrosion attacks. Several pits with various depths (C) relative to the casing thickness (t) and different casing diameter to thickness (D/t) ratios were considered in this study. For the purpose of investigation, 3D FE models consisting of defective casing-cement-formation system were developed. N80 casing with the casing length of 3.048 m is analyzed in the numerical study. In the analysis, the combined effects of cyclic thermal stress (from 25 °C to 360 °C), collapse pressure (from formation) and defects on casing were taken into account. From the numerical study, it is found that the casing imperfection greatly affected the casing strength in steam injection wells. The presence of pits markedly reduces the casing collapse strength in comparison to that of non-defective casing. For instance, the collapse strength of casing having 2 pits along its circumferential direction with depth C = 0.5t reduced about 49 and 43 for D/t = 22.09 and D/t = 17.26, respectively. In addition, the combination of high temperature, imperfection factor and formation pressure induces severe deformation on casing, even at lower formation pressure. © Published under licence by IOP Publishing Ltd.
format Article
author Hidayat, M.I.P.
Irawan, S.
Abdullah, M.Z.
spellingShingle Hidayat, M.I.P.
Irawan, S.
Abdullah, M.Z.
Effect of casing imperfection on the casing strength in steam injection wells
author_sort Hidayat, M.I.P.
title Effect of casing imperfection on the casing strength in steam injection wells
title_short Effect of casing imperfection on the casing strength in steam injection wells
title_full Effect of casing imperfection on the casing strength in steam injection wells
title_fullStr Effect of casing imperfection on the casing strength in steam injection wells
title_full_unstemmed Effect of casing imperfection on the casing strength in steam injection wells
title_sort effect of casing imperfection on the casing strength in steam injection wells
publisher Institute of Physics Publishing
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037734265&doi=10.1088%2f1757-899X%2f267%2f1%2f012019&partnerID=40&md5=1280bcb58598468f171e3ea23b946ce7
http://eprints.utp.edu.my/19897/
_version_ 1741196281994280960
score 11.62408

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