塔河油田某井P110S油管腐蚀断脱原因分析

杨新勇, 闫智伦, 李芳, 金伟, 张微, 郭玉洁

doi:10.16577/j.issn.1001-1560.2022.0205

材料保护 >

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

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

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塔河油田某井P110S油管腐蚀断脱原因分析

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1. 中国石油化工股份有限公司西北油田分公司，新疆乌鲁木齐 830011；2. 西南石油大学材料与生物工程学院，四川成都 610500；3. 长江大学石油工程学院，湖北荆州 434023；4. 沈阳中科腐蚀控制工程技术有限公司，辽宁沈阳 110027；5. 吉林石油集团工程管理有限责任公司，吉林松原 138000

李芳(1986-)，工程师，硕士，主要研究方向为油田腐蚀与防护，电话：18599031023，E - mail：lfang@sinopec.com

收稿日期: 2022-01-20

修回日期: 2022-02-28

录用日期: 2022-03-14

网络出版日期: 2023-12-17

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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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摘要

为了研究塔河油田抗硫油管的腐蚀现状和腐蚀原因，并对油管采取腐蚀防护措施提供合理化建议，通过宏观形貌观察、理化性能检测、金相组织分析、扫描电镜观察和能谱分析等方法，并结合现场工况，对某井P110S油管腐蚀失效原因进行综合分析。结果表明：该油管的化学成分、力学性能及金相组织均符合标准API SPEC 5CT-2011的要求，高含CO2、Cl-、H2O的腐蚀环境是引起油管内壁局部腐蚀、导致油管内壁严重减薄发生断脱的主要原因，且随着井深的增加，油管所处的温度也在升高，油管的腐蚀程度也趋于严重。

关键词： 油管; 断脱; CO2分压; Cl-

本文引用格式

杨新勇, 闫智伦, 李芳, 金伟, 张微, 郭玉洁 . 塔河油田某井P110S油管腐蚀断脱原因分析[J]. 材料保护, 2022 , 55(7) : 222 -226 . DOI: 10.16577/j.issn.1001-1560.2022.0205

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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