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Journal of Engineering
Volume 2018, Article ID 2581929, 7 pages
https://doi.org/10.1155/2018/2581929
Research Article

Analysis of Wellhead Uplift in Offshore Thermal Recovery by Using Finite Element Numerical Simulation

1COSL Production Optimization Division, Tanggu, Tianjin 300451, China
2China University of Petroleum, Beijing 102249, China

Correspondence should be addressed to Ting Sun; nc.ude.puc@nus.gnit

Received 28 June 2017; Accepted 1 November 2017; Published 2 January 2018

Academic Editor: Yingfang Zhou

Copyright © 2018 Shexia Dong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Pilot test of complex thermal fluid recovery technology was conducted in NB35-2 heavy oil field. Wellhead uplift was detected among some oil wells, and development of offshore thermal recovery technology could be restricted by the serious safety problems behind. This paper is based on the specific operating conditions of one oil well in the trial block, and the simulation calculation of casing elongation and wellhead uplift are conducted by using finite element analysis. The total casing elongation calculated is 4.2 cm, which is consistent with the field test results. According to the research, we concluded that the wellhead uplift is caused by upper casing elongation. 88% of the total elongation happens in the air and seawater sections. Elongation is lesser in strata and the casing string below 360 m can be considered as anchored.