井筒载荷-腐蚀耦合作用对碳钢套管服役寿命的影响

doi:10.7623/syxb201703011

石油学报 ›› 2017, Vol. 38 ›› Issue (3): 342-347,362.DOI: 10.7623/syxb201703011

井筒载荷-腐蚀耦合作用对碳钢套管服役寿命的影响

张智¹, 刘志伟¹, 谢玉洪², 李中³, 李炎军³, 张超³, 韦龙贵³, 段杰浩¹, 周琛洋¹

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中国海洋石油总公司北京 100010;
3. 中海石油(中国)有限公司湛江分公司广东湛江 524057

收稿日期:2016-06-13 修回日期:2017-02-06 出版日期:2017-03-25 发布日期:2017-04-07
通讯作者: 张智,男,1976年8月生,1999年获西南石油学院学士学位,2005年获西南石油大学博士学位,现为西南石油大学教授、博士生导师,主要从事油气井工程教学和科研工作。Email:wisezh@126.com
作者简介:张智,男,1976年8月生,1999年获西南石油学院学士学位,2005年获西南石油大学博士学位,现为西南石油大学教授、博士生导师,主要从事油气井工程教学和科研工作。Email:wisezh@126.com
基金资助:
国家重大科技专项（2016ZX05028-001-006、2016ZX05017-003）、四川省科技厅项目（2016JQ0010）和四川省省属高校科技创新团队建设计划资助项目（13TD0026）资助。

Influence of shaft load-corrosion coupling on the service life of carbon steel casing pipe

Zhang Zhi¹, Liu Zhiwei¹, Xie Yuhong², Li Zhong³, Li Yanjun³, Zhang Chao³, Wei Longgui³, Duan Jiehao¹, Zhou Chenyang¹

1. State Key Laboratory of Oil & Gas Reservoirs Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. China National Offshore Oil Corporation, Beijing 100010, China;
3. Zhanjiang Branch, CNOOC China Limited, Guangdong Zhanjiang 524057, China

Received:2016-06-13 Revised:2017-02-06 Online:2017-03-25 Published:2017-04-07

摘要/Abstract

摘要：

基于应力-腐蚀介质协同作用原理，结合化学力学效应理论，对高温高压超深井碳钢油、套管在使用过程中面临着CO₂、H₂S等腐蚀介质以及拉、压等复杂载荷建立了结合热应力影响套管腐蚀速率的解析模型，给出了计算应力影响管柱寿命衰减的解析公式，研究了碳钢油井管服役寿命，并对内压力、挂片实验实测腐蚀速率以及壁厚对碳钢套管服役寿命的影响进行了研究。结果表明，解析模型所得结果与文献报道的应力对腐蚀速率的影响结果相符。在井筒载荷及腐蚀工况下，增加壁厚相对于减小套管内压力，增加套管使用寿命效果不明显。初始腐蚀速率对套管的服役寿命影响较大，当管柱所受应力越大，管柱实际寿命衰减得越快。

关键词: 井筒载荷, 油、套管, 应力腐蚀, 协同作用, 腐蚀速率

Abstract:

Considering the corrosion media such as CO₂, H₂S and the complex load (e.g., pulling, pressing, etc.)suffered by carbon steel casing pipe in high temperature & pressure super-deep wells, as well as the influence of thermal stress on casing corrosion rate, an analytical model was built based on stress-corrosion medium synergy principle and mechanochemical effect, and an analytical formula was presented for calculating the influence of stress on the attenuated lifetime of tubular column so as to study the service life of carbon steel oil well pipe. Moreover, this paper studied the influence of internal pressure, corrosion rate actually measured during coupon test and wall thickness on the serve life of carbon steel casing pipe. The result from analytical model was accord well with that from experimental research on the influence of stress on corrosion rate (reported in literatures). Under the influence of shaft load and corrosion, increasing wall thickness cannot significantly prolong the service life of casing pipe compared with reducing internal pressure inside casing pipe. Furthermore, initial corrosion rate exhibits great impact on the service life of casing pipe; the larger the stress on pipe column is, the quicker the actual lifetime of pipe column will be attenuated.

Key words: shaft load, oil-casing pipe, stress corrosion, synergistic effect, corrosion rate

中图分类号:

TE98

张智, 刘志伟, 谢玉洪, 李中, 李炎军, 张超, 韦龙贵, 段杰浩, 周琛洋. 井筒载荷-腐蚀耦合作用对碳钢套管服役寿命的影响[J]. 石油学报, 2017, 38(3): 342-347,362.

Zhang Zhi, Liu Zhiwei, Xie Yuhong, Li Zhong, Li Yanjun, Zhang Chao, Wei Longgui, Duan Jiehao, Zhou Chenyang. Influence of shaft load-corrosion coupling on the service life of carbon steel casing pipe[J]. Acta Petrolei Sinica, 2017, 38(3): 342-347,362.

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井筒载荷-腐蚀耦合作用对碳钢套管服役寿命的影响

Influence of shaft load-corrosion coupling on the service life of carbon steel casing pipe

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