| 钟显康,郑子奇,莫林,卿阳,喻丝雨,扈俊颖.螺纹接头处拉应力作用下的缝隙腐蚀行为[J].装备环境工程,2020,17(11):52-59. ZHONG Xian-kang,ZHENG Zi-qi,MO Lin,QING Yang,YU Si-yu,HU Jun-ying.Crevice Corrosion at Screwed Joint with Tensile Stress[J].Equipment Environmental Engineering,2020,17(11):52-59. |
| 螺纹接头处拉应力作用下的缝隙腐蚀行为 |
| Crevice Corrosion at Screwed Joint with Tensile Stress |
| 投稿时间：2020-09-28 修订日期：2020-10-10 |
| DOI：10.7643/issn.1672-9242.2020.11.008 |
| 中文关键词: 缝隙腐蚀 应力腐蚀 螺纹 高温高压 |
| 英文关键词:crevice corrosion stress corrosion thread high temperature and pressure |
| 基金项目: |
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| Author | Institution |
| ZHONG Xian-kang | Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China |
| ZHENG Zi-qi | Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China |
| MO Lin | Natural Gas Research Institute of Southwest Oil and Gas Field Company Chengdu 610213, China |
| QING Yang | Central Sichuan Oil and Gas Deposit of Southwest Oil and Gas Field Company, Suining 629000, China |
| YU Si-yu | Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China |
| HU Jun-ying | Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China |
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| 中文摘要: |
| 目的 研究N80钢在高温高压中缝隙和应力耦合作用下的腐蚀行为，为油井管的选材和螺纹选型提供参考。方法 以油管螺纹接头为研究对象，在高温高压釜模拟地层环境，采用电化学方法和表面分析技术，研究N80钢在缝隙单因素作用下和缝隙-应力耦合作用下的腐蚀行为。结果 仅有缝隙作用24 h后，缝内存在大量腐蚀产物堆积，缝外几乎没有腐蚀产物。40 ℃时的凹槽深度为17.2 μm，而70 ℃时的凹槽深度则达到82.7 μm。在缝隙和应力耦合作用24 h后，在缝隙口处发现有腐蚀产物堆积，缝隙内腐蚀程度比缝隙外腐蚀程度更为严重。40 ℃时，弹性形变试样的缝隙口处凹槽深度约为35.3 μm，塑性形变的试样缝隙口处凹槽深度约为41.3 μm；而70 ℃时，发生弹性变形和塑性变形的试样缝隙口处凹槽深度则分别为143.7 μm和243.9 μm。结论 缝隙和应力耦合作用使缝隙口处凹槽的深度加深，且深度随着腐蚀时间和温度的增加而增大，塑性形变时凹槽深度最大。这表明应力的施加会加剧N80钢的缝隙腐蚀，导致形成更深的腐蚀凹槽，这反过来又会导致应力的进一步集中，应力腐蚀风险增加。因此，缝隙和应力对N80钢在高温高压地层水环境中的腐蚀具有协同作用。 |
| 英文摘要: |
| The work aims to study the corrosion behavior of N80 steel under the combined crevice and tensile stress in high temperature and high pressure environment, to provide reference for selection of oil well pipe and thread. With screwed joint of oil tube as the research object, the corrosion behaviors of N80 steel under single factor and crevice-stress coupling factor were studied by electrochemical techniques and surface analysis methods in stratum simulated by high temperature and high pressure autoclave. Under the single action of crevice for 24 h, a large number of corrosion products accumulated in the crevice, and almost no corrosion products accumulated outside the crevice. The groove depth at 40 ℃ was 17.2 μm, while the groove depth at 70 ℃ was 82.7 μm. Under the combined effect of crevice and stress for 24 h, corrosion products were found to accumulate at the crevice mouth, and the corrosion degree in the crevice was more serious than that outside the crevice. At 40 ℃, the groove depth at the crevice mouth with elastic deformation specimen was about 35.3 μm, and that at the crevice mouth with plastic deformation specimen was about 41.3 μm. However, at 70 ℃, the groove depth at the crevice mouth of the specimen with elastic deformation and plastic deformation was 143.7 μm and 243.9 μm respectively. Under the coupling effect of crevice and stress, the depth of groove at the crevice mouth is deepened, and with the increase of corrosion time and temperature, the depth of groove increases to the deepest when plastic deformation occurs. This shows that the application of stress will aggravate the crevice corrosion of N80 steel and lead to the formation of deeper corrosion grooves, which in turn will lead to the further concentration of stress, resulting in higher stress corrosion. Therefore, crevice and stress have synergistic effect on corrosion of N80 steel in high temperature and high pressure formation water environment. |
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