何淼,张鑫柱,刘伟,李琼玮.天然气井油管有机涂层的失效分析[J].表面技术,2016,45(2):17-21,27.
HE Miao,ZHANG Xin-zhu,LIU Wei,LI Qiong-wei.Failure Analysis of Organic Coating under Natural Gas Well Condition[J].Surface Technology,2016,45(2):17-21,27
天然气井油管有机涂层的失效分析
Failure Analysis of Organic Coating under Natural Gas Well Condition
投稿时间:2015-10-20  修订日期:2016-02-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.02.003
中文关键词:  有机涂层  天然气井  油管  浸泡试验  失效分析  腐蚀
英文关键词:organic coating  natural gas well  oil pipe  immersion test  failure analysis  corrosion
基金项目:中石油陕 224 储气库注采井配套技术研究(2012-29-05)
作者单位
何淼 1. 低渗透油气田勘探开发国家工程实验室, 西安 710018;2. 中国石油长庆油田分公司 油气工艺研究院, 西安 710018 
张鑫柱 1. 低渗透油气田勘探开发国家工程实验室, 西安 710018;2. 中国石油长庆油田分公司 油气工艺研究院, 西安 710018 
刘伟 1. 低渗透油气田勘探开发国家工程实验室, 西安 710018;2. 中国石油长庆油田分公司 油气工艺研究院, 西安 710018 
李琼玮 1. 低渗透油气田勘探开发国家工程实验室, 西安 710018;2. 中国石油长庆油田分公司 油气工艺研究院, 西安 710018 
AuthorInstitution
HE Miao 1. National Engineering Laboratory for Low-permeability Oil & Gas Exploration and Development, Xi'an 710018, China;2. Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi'an 710018, China 
ZHANG Xin-zhu 1. National Engineering Laboratory for Low-permeability Oil & Gas Exploration and Development, Xi'an 710018, China;2. Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi'an 710018, China 
LIU Wei 1. National Engineering Laboratory for Low-permeability Oil & Gas Exploration and Development, Xi'an 710018, China;2. Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi'an 710018, China 
LI Qiong-wei 1. National Engineering Laboratory for Low-permeability Oil & Gas Exploration and Development, Xi'an 710018, China;2. Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi'an 710018, China 
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中文摘要:
      目的 研究有机涂层在天然气井高温、高压环境下的失效特征和失效原因,为天然气井井筒有机涂层应用提供建议。 方法 模拟含 CO2,H2S 等介质的气井井下环境,通过 9 轮次、1914 h 的长周期浸泡试验,对比测试某种有机涂层试样的厚度、冲击韧性等物理、机械性能参数,分析涂层宏、微观形貌变化。 结果 经过反复升、降压的苛刻室内浸泡实验后,有机涂层逐步老化。 耐磨值由最初的 3. 28 L/ μm下降到 2 L/ μm 左右;硬度值由最初的 125 下降到 95 左右;冲击韧性值由最初的 37. 6 J 下降到浸泡 890 h时的 23. 5 J 左右,之后趋于平稳。 1914 h 后,涂层与碳钢基体界面结合性能变差,表面出现明显的局部腐蚀坑点。 结论 室内涂层试验与气井油管涂层现场生产中发生的失效特征类似,存在失重、减薄—鼓泡—膜下腐蚀、脱落的失效过程。 为避免油管内涂层失效,提高防腐效果,建议:在油管生产加工过程中控制固化度,避免因固化度不足导致涂层缺陷;在工程作业中应避免钢丝作业、快速泄压等对涂层的潜在损伤;定期进行缓蚀剂加注,减轻腐蚀。
英文摘要:
      Objective To conduct failure analysis of organic coating under high temperature, high pressure condition of natural gas well, so as to provide suggestions for the selection of the organic coating used in the natural gas well pipes. Methods In this paper, the downhole condition of natural gas well containing media such as CO2 and H2S was simulated and the long-term immersion experiment of 9 rounds lasting 1914 h was conducted to compare and test the thickness, impact toughness and other mechanic parameters of organic coatings. Macroscopic and microcosmic changes of immersion surface were observed and analyzed. Results Organic coatings aged slowly after repeated pressure increasing and decompression in the rigorous indoor test. The wear resistant value decreased from the initial 3. 28 L / μm down to around 2 L / μm. The hardness value decreased from the initial 125 to about 95. The impact toughness dropped from the initial 37. 6 J to about 23. 5 J at 890 hours of immersion, then tended to be stable. After 1914 hours, the connect property between coating and carbon steel matrix turned worse, and obvious local pitting corrosion was found on the coating surface. Conclusion Failure characters which occurred in the indoor coating test were similar with those in the field production of pipe coating in gas well field. The failure process was weight loss, less thickness—blister—corrosion under polymer layer, and then peeling off. In order to avoid the failure of internal coating of oil pipe and to improve the corrosion protection effect, it is recommended to control the degree of cure in oil production and processing process so as to reduce the coating defects caused by low degree of cure, avoid potential damage of coating which is due to wire operation and rapid pressure releasing in engineering operation, and inject corrosion inhibitor regularly to reduce corrosion.
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