高温下L80钢的断裂机理及CO<sub>2</sub>/H<sub>2</sub>S模拟工况下的腐蚀行为

doi:10.11902/1005.4537.2022.259

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 601-610 CSTR: 32134.14.1005.4537.2022.259 DOI: 10.11902/1005.4537.2022.259

研究报告

本期目录 | 过刊浏览

高温下L80钢的断裂机理及CO₂/H₂S模拟工况下的腐蚀行为

周志平¹, 吴大康², 张宏福³, 张磊⁴, 李明星³, 张志鑫⁵, 钟显康⁵(

)

^1.中国石油长庆油田分公司西安 710018
^2.中国石油长庆油田分公司第十二采油厂庆阳 745100
^3.中国石油长庆油田分公司油气工艺研究院西安 710018
^4.中国石油长庆油田分公司第四采气厂西安 710016
^5.西南石油大学石油与天然气工程学院成都 610500

Tensile Property of L80 Steel in Air at 25-350 ℃ and Its Corrosion Behavior in Simulated Casing Service Conditions at 150-350 ℃

ZHOU Zhiping¹, WU Dakang², ZHANG Hongfu³, ZHANG Lei⁴, LI Mingxing³, ZHANG Zhixin⁵, ZHONG Xiankang⁵(

)

^1.PetroChina Changqing Oilfield Company, Xi'an 710018, China
^2.No. 12 Oil Production Plant of PetroChina Changqing Oilfield Company, Qingyang 745100, China
^3.PetroChina Changqing Oilfield Company Oil and Gas Technology Research Institute, Xi'an 710018, China
^4.No. 4 Gas Production Plant of PetroChina Changqing Oilfield Company, Xi'an 710016, China
^5.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China

全文: PDF(7758 KB) HTML

摘要:

采用扫描电子显微镜、X射线光电子能谱、高温拉伸实验及高温高压腐蚀实验，研究温度对L80钢拉伸断裂行为及其在CO₂/H₂S模拟工况下腐蚀行为的影响规律。结果表明：温度对屈服强度和抗拉强度影响显著，且屈服强度的衰减明显大于抗拉强度。拉伸断裂方式由常温时的微孔聚集配合剪切撕裂转变为高温下的微孔聚合主导。腐蚀速率随温度升高明显增加，且温度越高增幅越大。腐蚀反应由H₂S腐蚀控制，腐蚀产物呈双层结构，温度对其结构形式和晶体形态影响显著。随温度升高，位于产物膜底层FeS的占比增加，表层FeCO₃的致密性增强。研究结果对L80油套管在极端工况中的服役寿命及适应性分析具有参考价值。

关键词 ：高温, 高温拉伸, 断裂机理, 高温高压腐蚀, 腐蚀产物

Abstract：

In this article, the tensile fracture behavior of L80 steel in air at 25-350 ^oC and its high-temperature and high-pressure corrosion behavior in CO₂/H₂S in an artificial formation water at 150-350 ^oC are investigated by means of mass loss measurement, scanning electron microscopy, X-ray photoelectron spectroscopy. The results suggest that the yield strength and tensile strength of L80 both appear to severe decline with the increasing temperature, while the decay of the former is significantly greater than that of the latter. Meanwhile, the tensile fracture mechanism of L80 steel changes from microporous aggregation with shear tearing at room temperature to a dominant microporous aggregation at high temperatures. The corrosion rate increases significantly with the increasing temperature, and the higher the temperature, the faster the increase rate. The bilayer structure of the corrosion products and their crystal morphology are markedly affected by temperature, and the percentage of FeS in the inner layer and the compactness of FeCO₃ of the outer layer both increase with the increasing temperature. The results of the study may provide a reference for the evaluation of the adaptability of L80 oil casing for service in extreme conditions.

Key words： high temperature high-temperature tensile fracture mechanism high temperature and high pressure corrosion corrosion products

收稿日期: 2022-08-17 32134.14.1005.4537.2022.259

ZTFLH:

TG174

基金资助:中国石油天然气股份有限公司重大科技项目(2021DJ5203)

通讯作者: 钟显康，E-mail：zhongxk@swpu.edu.cn，研究方向为油气田腐蚀与防护

Corresponding author: ZHONG Xiankang, E-mail: zhongxk@swpu.edu.cn

作者简介: 周志平，男，1966年生，硕士，教授级高级工程师

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引用本文:

周志平, 吴大康, 张宏福, 张磊, 李明星, 张志鑫, 钟显康. 高温下L80钢的断裂机理及CO₂/H₂S模拟工况下的腐蚀行为[J]. 中国腐蚀与防护学报, 2023, 43(3): 601-610.
ZHOU Zhiping, WU Dakang, ZHANG Hongfu, ZHANG Lei, LI Mingxing, ZHANG Zhixin, ZHONG Xiankang. Tensile Property of L80 Steel in Air at 25-350 ℃ and Its Corrosion Behavior in Simulated Casing Service Conditions at 150-350 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 601-610.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.259 或 https://www.jcscp.org/CN/Y2023/V43/I3/601

图1 实验用L80套管钢显微组织

图2 L80钢在大气环境中各温度下的拉伸应力-应变曲线

图3 L80钢的力学性能随温度的变化情况

图4 L80钢在不同温度下的拉伸断口宏观形貌

图5 不同温度下L80钢拉伸断口的裂纹源区微观形貌

图6 不同温度下L80钢在模拟工况中的腐蚀速率

图7 L80钢在不同温度下腐蚀7 d后试样的宏观形貌

图8 L80钢在不同温度下腐蚀7天后的表面SEM形貌

图9 不同温度下试样表面去除腐蚀产物后的SEM形貌

图10 不同温度下腐蚀产物的XPS图谱

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