新疆油田CO2驱采出工况柔性复合管接头可靠性评价
Reliability Evaluation of Flexible Composite Pipe Joints for CO2 Flooding Production Conditions in Xinjiang Oilfield
摘 要
提出了一套非金属管材接头可靠性评价方法。采用高温高压釜对柔性复合管金属接头进行缝隙腐蚀试验，并利用3D景深显微镜对试片表面形貌进行观察；采用傅里叶红外光谱仪和邵氏硬度计对试验前后密封垫圈的性能进行分析；在极端工况下对整管密封进行可靠性测试。结果表明：在温度60℃、CO2分压1.5 MPa的多相介质环境中，接头管材的腐蚀速率为0.119 4 mm/a，属于中等腐蚀程度，加入缓蚀剂后，腐蚀速率显著降低，且低于0.076 mm/a；在极端工况下，聚四氟乙烯垫圈和丁腈橡胶垫圈无破损，接头性能稳定、可靠。
接头
CO2驱
腐蚀
密封垫圈
flexible composite pipe
joint
CO2 flooding
corrosion
sealing washer
Abstract
A set of reliability evaluation method for non-metallic pipe joint was proposed. The crevice corrosion test of flexible composite pipe metal joint was carried out by high temperature and high pressure autoclave, and the surface morphology of the test piece was observed by 3D depth field microscope. The performance of the sealing washer before and after the test was analyzed by Fourier infrared spectrometer and Shore hardness tester. The reliability test of the whole pipe seal was carried out under extreme conditions. The results showed that the corrosion rate of the joint pipe was 0. 119 4 mm/a in the multi-phase medium environment with temperature of 60℃ and CO2 partial pressure of 1. 5 MPa, which belonged to the medium corrosion degree. After adding the corrosion inhibitor, the corrosion rate decreased significantly and was lower than 0. 076 mm/a. Under extreme conditions, polytetrafluoroethylene washer and nitrile rubber washer were not damaged, and the joint performance was stable and reliable.
中图分类号 TG174 DOI 10.11973/fsyfh-202312017
所属栏目 应用技术
基金项目 国家自然科学基金（51774249）；四川省科技计划（21JCQN0066）
收稿日期 2022/1/6
修改稿日期
网络出版日期
作者单位点击查看
引用该论文: WU Yan,LIU Zhendong,ZHU Quanrui,MING Kunji,LU Chenghui,ZENG Dezhi. Reliability Evaluation of Flexible Composite Pipe Joints for CO2 Flooding Production Conditions in Xinjiang Oilfield[J]. Corrosion & Protection, 2023, 44(12): 109
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【6】曾德智, 同航, 易勇刚, 等.二氧化碳驱采油井缓蚀阻垢剂的复配实验研究[J].石油与天然气化工, 2018, 47(6):68-73.
【7】贺三, 向粟林, 夏兴宇, 等.CO2驱油下非金属管材耐蚀性能初步评价[J].油气藏评价与开发, 2020, 10(3):86-91.
【8】张兆, 刘鹏, 徐超, 等.玻璃纤维增强热塑性复合管性能评价方法研究进展[J].中国塑料, 2019, 33(8):136-143.
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