HL型抽油杆断裂失效分析
|
摘要
通过力学性能检测、显微组织和断口分析,结合服役工况条件,对某油田公司发生的抽油杆断裂失效事故原因进行了分析。结果表明:腐蚀疲劳是导致抽油杆断裂失效的主要原因,抽油杆结构因素造成的局部应力集中导致疲劳裂纹往往起源于抽油杆镦锻过渡区及其前沿30~60 mm范围的区域,同时抽油杆的表面脱碳也会导致抽油杆疲劳寿命的降低。通过优化与改进抽油杆结构以降低抽油杆局部的应力集中、添加缓蚀剂改善抽油杆的服役环境、提高抽油杆表面质量及制备耐蚀涂层等途径可有效提高抽油杆的服役寿命。
Failure causes of HL grade sucker rod were investigated through mechanical properties test,microstructure observation and fracture based on the working condition of the sucker rod. The results show that corrosion fatigue is the main cause to result in the fracture of the rod. The fatigue cracks often originate from the forging transition area of the rod and neighboring region,which can be attributed to the local stress concentration caused by the contour structure. Moreover,surface decarburization can also result in the declining of fatigue expectancy. The service life of the rods can be effectually enhanced by means of optimization of the structure,the use of corrosion inhibitor,the improvement of surface quality and the preparation of anticorrosion coating.
Failure causes of HL grade sucker rod were investigated through mechanical properties test,microstructure observation and fracture based on the working condition of the sucker rod. The results show that corrosion fatigue is the main cause to result in the fracture of the rod. The fatigue cracks often originate from the forging transition area of the rod and neighboring region,which can be attributed to the local stress concentration caused by the contour structure. Moreover,surface decarburization can also result in the declining of fatigue expectancy. The service life of the rods can be effectually enhanced by means of optimization of the structure,the use of corrosion inhibitor,the improvement of surface quality and the preparation of anticorrosion coating.
引文
[1]吴则中,钟永海,孟忠良,等.我国抽油杆研制工作的现状及发展方向[J].石油机械,2008,36(2):63-66.
[2]王国正,张朋举,汪继刚,等.油井空心抽油杆杆头断裂失效分析[J].金属热处理,2015,40(2):200-203.Wang Guozheng,Zhang Pengju,Wang Jigang,et al.Fracture failure analysis of hollow sucker rods head for oil well[J].Heat Treatment of Metals,2015,40(2):200-203.
[3]边勇俊,石伟,劳金约,等.20Cr Mo钢抽油杆断裂原因分析[J].金属热处理,2011,36(9):106-108.Bian Yongjun,Shi Wei,Lao Jinyue,et al.Fracture causes analysis of20Cr Mo steel sucker rod[J].Heat Treatment of Metals,2011,36(9):106-108.
[4]王少力,郑子元.超高强度抽油杆在国内外的推广应用[J].石油矿场机械,2008,37(4):24-27.Wang Shaoli,Zheng Ziyuan.Domestic and foreign application of the super-strength sucker rod[J].Oil Field Equipment,2008,37(4):24-27.
[5]张朋举,王语,殷志杰,等.D级镦锻式空心抽油杆的热处理工艺[J].金属热处理,2015,40(1):71-73.Zhang Pengju,Wang Yu,Yin Zhijie,et al.Heat treatment process of grade D forged hollow sucker rods[J].Heat Treatment of Metals,2015,40(1):71-73.
[6]范世平,李小彦,郭纯恩,等.20Cr Mo钢空心抽油杆的调质处理工艺[J].金属热处理,2015,40(7):153-155.Fan Shiping,Li Xiaoyan,Guo Chunen,et al.Quenching and tempering process of 20Cr Mo steel hollow sucker rod[J].Heat Treatment of Metals,2015,40(7):153-155.
[7]杨小辉,甄建伟,陈灿,等.塔河油田抽油杆断裂原因分析及防治对策[J].石油矿场机械,2013,42(8):44-47.Yang Xiaohui,Zhen Jianwei,Chen Can,et al.Analysis of sucker rod fracture and preventive measures in Tahe oilfield[J].Oil Field Equipment,2013,42(8):44-47.
[8]黄永昌,张建旗.现代材料腐蚀与防护[M].上海:上海交通大学出版社,2012.
[9]梁辰,邓福成,李惠子,等.抽油杆柱疲劳断裂失效分析[J].石油矿场机械,2013,42(4):71-74.Liang Chen,Deng Fucheng,Li Huizi,et al.Fracture failure analysis of the sucker rod[J].Oil Field Equipment,2013,42(4):71-74.
[2]王国正,张朋举,汪继刚,等.油井空心抽油杆杆头断裂失效分析[J].金属热处理,2015,40(2):200-203.Wang Guozheng,Zhang Pengju,Wang Jigang,et al.Fracture failure analysis of hollow sucker rods head for oil well[J].Heat Treatment of Metals,2015,40(2):200-203.
[3]边勇俊,石伟,劳金约,等.20Cr Mo钢抽油杆断裂原因分析[J].金属热处理,2011,36(9):106-108.Bian Yongjun,Shi Wei,Lao Jinyue,et al.Fracture causes analysis of20Cr Mo steel sucker rod[J].Heat Treatment of Metals,2011,36(9):106-108.
[4]王少力,郑子元.超高强度抽油杆在国内外的推广应用[J].石油矿场机械,2008,37(4):24-27.Wang Shaoli,Zheng Ziyuan.Domestic and foreign application of the super-strength sucker rod[J].Oil Field Equipment,2008,37(4):24-27.
[5]张朋举,王语,殷志杰,等.D级镦锻式空心抽油杆的热处理工艺[J].金属热处理,2015,40(1):71-73.Zhang Pengju,Wang Yu,Yin Zhijie,et al.Heat treatment process of grade D forged hollow sucker rods[J].Heat Treatment of Metals,2015,40(1):71-73.
[6]范世平,李小彦,郭纯恩,等.20Cr Mo钢空心抽油杆的调质处理工艺[J].金属热处理,2015,40(7):153-155.Fan Shiping,Li Xiaoyan,Guo Chunen,et al.Quenching and tempering process of 20Cr Mo steel hollow sucker rod[J].Heat Treatment of Metals,2015,40(7):153-155.
[7]杨小辉,甄建伟,陈灿,等.塔河油田抽油杆断裂原因分析及防治对策[J].石油矿场机械,2013,42(8):44-47.Yang Xiaohui,Zhen Jianwei,Chen Can,et al.Analysis of sucker rod fracture and preventive measures in Tahe oilfield[J].Oil Field Equipment,2013,42(8):44-47.
[8]黄永昌,张建旗.现代材料腐蚀与防护[M].上海:上海交通大学出版社,2012.
[9]梁辰,邓福成,李惠子,等.抽油杆柱疲劳断裂失效分析[J].石油矿场机械,2013,42(4):71-74.Liang Chen,Deng Fucheng,Li Huizi,et al.Fracture failure analysis of the sucker rod[J].Oil Field Equipment,2013,42(4):71-74.