基于COMSOL的铝合金钻杆腐蚀分析
投稿时间:2021-02-14  修订日期:2021-03-18  点此下载全文
引用本文:梁健,赵杰,王成彪,等.基于COMSOL的铝合金钻杆腐蚀分析[J].钻探工程,2021,48(4):1-10.
LIANG Jian,ZHAO Jie,WANG Chengbiao,et al. Analysis of aluminum alloy drill pipe corrosion based on COMSOL[J]. Drilling Engineering, 2021,48(4):1-10.
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作者单位E-mail
梁健* 中国地质科学院勘探技术研究所河北 廊坊 065000
中国地质调查局深部地质钻探技术研究中心河北 廊坊 065000
中国地质大学(北京)工程技术学院北京 100083 
raul9942718@163.com 
赵杰 北京石油化工学院机械工程学院北京 102617  
王成彪 中国地质大学(北京)工程技术学院北京 100083  
何鑫 北京石油化工学院机械工程学院北京 102617  
尹浩 中国地质科学院勘探技术研究所河北 廊坊 065000
中国地质调查局深部地质钻探技术研究中心河北 廊坊 065000 
 
基金项目:国家自然科学基金项目“科学超深井铝合金钻杆的腐蚀防护机制研究”(编号:41772390);国家重点研发计划项目“5000 米智能地质钻探技术装备研发及应用示范”课题三“高性能薄壁绳索取心钻杆研制”(编号:2018YFC0603403);中国地质调查局地质调查项目“深海钻探技术与工程支撑”(编号:DD20190585)
中文摘要:为预测科学超深井钻探工程中铝合金钻杆耐腐蚀性能,运用COMSOL软件,建立多物理场腐蚀分析模型,开展“松科二井”铝合金钻杆“应力-温度-电化学”作用下的腐蚀规律仿真分析。分析结果表明:腐蚀体系达到平衡时,铝合金电极一侧的电解质电位偏高,钢接头电极一侧电解质电位偏低,靠近钢接头电极一侧铝杆体电流密度高;随着钻杆所受应力、温度的增加,腐蚀速率加快,相对于温度的影响,载荷对腐蚀影响较小;腐蚀速率和井下工作时间成正线性相关;离钢接头的电偶腐蚀处越近,铝合金钻杆的界面电流密度越大,并成指数关系,外壁强影响区域大约在距电偶腐蚀处0~200 mm,内壁为0~110 mm。研究成果将为铝合金钻杆的工程防腐提供参考。
中文关键词:科学超深井  科学钻探  铝合金钻杆  腐蚀  数值模拟
 
Analysis of aluminum alloy drill pipe corrosion based on COMSOL
Abstract:In order to predict the corrosion resistance of aluminum alloy drill pipes (ADP) in scientific ultra-deep drilling, COMSOL software was used to establish a multi physical field corrosion analysis model for simulation and analysis of the corrosion law of ADP used in SK-2 well under the action of “stress temperature electrochemistry”. The results show that when the corrosion system reaches equilibrium, the electrolyte potential on one side of the aluminum alloy electrode is higher than the steel joint electrode, and the current density of the aluminum rod near the steel joint electrode is higher. With the increase of stress and temperature, the corrosion rate of ADP is accelerated. Compared with temperature, the influence of stress on corrosion is smaller. It is a positive linear relationship between the corrosion rate and the working time. The closer to the galvanic corrosion site, the higher the interface current density of ADP, exhibiting an exponential relationship. The intensive influence area in the outer wall is about 0~200mm away from galvanic corrosion and that in the inner wall 0~110mm away from. The research results can provide reference for the anti-corrosion of aluminum alloy drill pipes.
keywords:scientific ultra-deep well  scientific drilling  aluminum alloy drill pipe  corrosion  numerical simulation
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