Study on Critical Defect Size of HTPO Inner Repaired Pipelines

GAO Duo-long, GE Peng-li, GAO Liang, LIU Qing-shan, XIAO Wen-wen, XU Yan-yan, CHEN Ying-feng, LIU Dong-huan

doi:10.16577/j.cnki.42-1215/tb.2021.02.027

Materials Protection >

2021 , Vol. 54 >Issue 2: 148 - 151

DOI: https://doi.org/10.16577/j.cnki.42-1215/tb.2021.02.027

Study on Critical Defect Size of HTPO Inner Repaired Pipelines

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(1. SINOPEC Engineering and Technology Institute of Northwest Oilfield Company, Urumqi 830011, China; 2. Safetech Research Institute, SRI, Beijing 102209, China; 3. School of Mathematics and Physics,University of Science and Technology Beijing, Beijing 100083, China)

Received date: 2020-08-26

Online published: 2025-07-10

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Abstract

In TaHe oilfield, inner repairing technique is usually adopted to repair the pipe with corrosion perforated defect, which includes HTPO interpenetration repair technology and continuous pressure hose repair technology. The HTPO pipe can’t sustain pressure while its cost is low, and the continuous pressure hose can sustain pressure while its cost is high. But, there is no clear understanding on how to select inner repair material reasonably on site. To solve this problem, by simplifying the actual engineering problem into a physical model, the finite element software was used to establish the relevant model for calculation, which could give the critical defect size of the HTPO inner repair pipeline and could be verified by full-scale hydraulic test. The verified finite element model could accurately give the critical defect size of the commonly used pipelines in TaHe oilfield, which was repaired by HTPO pipe under the operating pressure of 2.5 MPa and 4.0 MPa, providing technical guidance for the actual field construction on site.

Key words： corrosion perforation; inner repair; finite element calculation; hydrostatic test; critical size

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GAO Duo-long, GE Peng-li, GAO Liang, LIU Qing-shan, XIAO Wen-wen, XU Yan-yan, CHEN Ying-feng, LIU Dong-huan . Study on Critical Defect Size of HTPO Inner Repaired Pipelines[J]. Materials Protection, 2021 , 54(2) : 148 -151 . DOI: 10.16577/j.cnki.42-1215/tb.2021.02.027

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