Analysis of the Corrosion and Fracture of P110S Tubing in a Well of Tahe Oilfield

YANG Xin - yong, YAN Zhi - lun, LI Fang, JIN Wei, ZHANG Wei, GUO Yu - jie

doi:10.16577/j.issn.1001-1560.2022.0205

Materials Protection >

2022 , Vol. 55 >Issue 7: 222 - 226

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0205

Analysis of the Corrosion and Fracture of P110S Tubing in a Well of Tahe Oilfield

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1. SINOPEC Northwest Company of China Petroleum and Chemical Corporation, Urumqi 830011, China;2. Southwest Petroleum University, Chengdu 610500, China;3. Yangtze University, Jingzhou 434023, China;4. Shenyang Zhongke Corrosion Control Engineering Technology Co., Ltd., Shenyang 110027, China;5. Jilin Petroleum Group Engineering Management Co., Ltd., Songyuan 138000, China

Received date: 2022-01-20

Revised date: 2022-02-28

Accepted date: 2022-03-14

Online published: 2023-12-17

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Abstract

In order to study the corrosion status and reasons of the sulfur - resistant tubings in Tahe oilfield and provide reasonable suggestions for tubing corrosion protection, the causes of corrosion failure of P110S tubing in a well were comprehensively analyzed by means of macro - morphological observation, physical and chemical property testing, metallographic structure analysis, scanning electron microscope observation and energy spectrum analysis based on field conditions. Results showed that the tubing’s chemical composition, mechanical properties and metallographic structure met API SPEC 5CT-2011 requirements, and a corrosion environment with high contents of CO2, Cl - and H2O was the main reason for the local corrosion of the inner wall of the tubing, which subsequently led to a serious thinning and fracture of the inner wall of the tubing. With the increase of the well depth, the service temperature of the tubing increased, and the corrosion degree of the tubing increased as well.

Key words： tubing; fracture; CO2 partial pressure; Cl-

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YANG Xin - yong, YAN Zhi - lun, LI Fang, JIN Wei, ZHANG Wei, GUO Yu - jie . Analysis of the Corrosion and Fracture of P110S Tubing in a Well of Tahe Oilfield[J]. Materials Protection, 2022 , 55(7) : 222 -226 . DOI: 10.16577/j.issn.1001-1560.2022.0205

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