TY  - CONF
Y1  - 2017///
SN  - 17578981
PB  - Institute of Physics Publishing
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037734265&doi=10.1088%2f1757-899X%2f267%2f1%2f012019&partnerID=40&md5=1280bcb58598468f171e3ea23b946ce7
A1  - Hidayat, M.I.P.
A1  - Irawan, S.
A1  - Abdullah, M.Z.
VL  - 267
AV  - none
N1  - cited By 1; Conference of International Conference of Applied Science and Technology for Infrastructure Engineering 2017, ICASIE 2017 ; Conference Date: 5 August 2017; Conference Code:132296
N2  - 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.
KW  - Oil well casings; Wells
KW  -  Circumferential direction; Collapse pressure; Collapse strength; Corrosion attack; Formation pressure; Severe Deformation; Steam injection wells; Thermal environment
KW  -  Injection (oil wells)
TI  - Effect of casing imperfection on the casing strength in steam injection wells
ID  - scholars8129
ER  -