S135钻杆腐蚀孔洞形成原因分析
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摘要
目的对某S135钢级钻杆的腐蚀孔洞形成原因进行分析。方法通过化学成分分析、金相组织分析、钻杆宏观外貌分析、力学性能测试及扫描电镜与能谱分析等一系列分析试验,对该S135钻杆材料的力学性能、化学成分、金相组织、非金属夹杂物、晶粒度、钻杆的外圆面宏观形貌、钻杆的腐蚀孔洞特征和腐蚀产物进行分析。结果该S135钢级钻杆的化学成分合格,符合产品技术条件要求;钻杆的强度、塑性、冲击韧性等力学性能指标均合格,均符合产品技术条件要求,其中冲击韧性值达到97 J,超出技术条件要求值一倍以上;钻杆的金相组织为回火索氏体,为正常的调质热处理组织;钻杆的晶粒度级别为7级,符合产品技术条件要求;钻杆的各类非金属夹杂物级别均未超过1.0级,符合产品技术条件要求,钻杆外圆面存在大量的麻点、麻坑,腐蚀孔洞壁存在含氧元素的腐蚀产物,即存在氧腐蚀。结论该S135钢级钻杆本体孔洞为应力腐蚀疲劳所致的孔洞,其产生因素有:第一,钻杆本体外圆面上存在麻点、麻坑;第二,钻杆承受交变弯曲应力;第三,钻杆外圆面局部氧腐蚀作用。
Objective To analyze the cause for corrosion holes on S135 drill pipe. Methods In this paper,the chemical composition analysis,metallographic test,macro morphological analysis,mechanical performance testing,scanning electron microscopy( SEM) and energy spectrum analysis were used to analyze the mechanical property,chemical composition,metallurgical structure,non-metallic inclusion,grain size,and drill pipe's top circle surface,and corrosion holes' s characteristics and corrosion products of S135 drill pipe material. Results The drill pipe' s chemical composition was qualified,meeting the technical requirements of the product. The mechanical performance indexes of the drill pipe such has strength,plasticity and impact toughness were all qualified,meeting the technical requirements of the product,among which,the impact toughness reached 97 J,which exceeded the technical requirement value by more than 1 fold. The metallographic structure of the drill pipe was tempering sorbite,which was a normal quenched heat treatment structure. The grain size of the drill pipe was Grade 7,meeting the technical requirements of the product. The grade of all kinds of non-metallic inclusion did not exceed 1. 0,which met the technical requirements of the product.There were plenty of pits and pockmarks on the top circle surface of the drill pipe,and there were corrosion products containing oxygen element on the wall of the corrosion holes,i. e.,there was oxygen corrosion. Conclusion The analysis results showed that the hole on the S135 drill pipe was caused by the stress corrosion fatigue. There were three factors leading to its generation: first,the pits and pockmarks existed on the top circle surface of the drill pipe; second,the alternating bending stress borne by drill pipe;third,the local oxygen corrosion on the top circle surface of the drill pipe.
Objective To analyze the cause for corrosion holes on S135 drill pipe. Methods In this paper,the chemical composition analysis,metallographic test,macro morphological analysis,mechanical performance testing,scanning electron microscopy( SEM) and energy spectrum analysis were used to analyze the mechanical property,chemical composition,metallurgical structure,non-metallic inclusion,grain size,and drill pipe's top circle surface,and corrosion holes' s characteristics and corrosion products of S135 drill pipe material. Results The drill pipe' s chemical composition was qualified,meeting the technical requirements of the product. The mechanical performance indexes of the drill pipe such has strength,plasticity and impact toughness were all qualified,meeting the technical requirements of the product,among which,the impact toughness reached 97 J,which exceeded the technical requirement value by more than 1 fold. The metallographic structure of the drill pipe was tempering sorbite,which was a normal quenched heat treatment structure. The grain size of the drill pipe was Grade 7,meeting the technical requirements of the product. The grade of all kinds of non-metallic inclusion did not exceed 1. 0,which met the technical requirements of the product.There were plenty of pits and pockmarks on the top circle surface of the drill pipe,and there were corrosion products containing oxygen element on the wall of the corrosion holes,i. e.,there was oxygen corrosion. Conclusion The analysis results showed that the hole on the S135 drill pipe was caused by the stress corrosion fatigue. There were three factors leading to its generation: first,the pits and pockmarks existed on the top circle surface of the drill pipe; second,the alternating bending stress borne by drill pipe;third,the local oxygen corrosion on the top circle surface of the drill pipe.
引文
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[15]刘婉莹,曾德智,施太和,等.S135钻杆的腐蚀疲劳断裂失效分析[C].第十五届全国疲劳与断裂学术会议摘要及论文集.广东:[出版者不详],2010:35—36.LIU Wan-ying,ZENG De-zhi,SHI Tai-he,et al.Corrosion Fatigue Fracture Failure Analysis of S135 Drill Pipe[C].Summary of the Fifteenth National Symposium on Fatigue and Fracture.Guangdong:[s.n.],2010:35—36.
[2]何蕾,栾道成,陈晓男,等.辙叉用新型贝氏体钢的滚动接触性能[J].金属热处理,2014,39(2):51—54.HE Lei,LUAN Dao-cheng,CHEN Xiao-nan,et al..Rolling Contact Fatigue Performance of a New Type Bainitic Steel for Frog[J].Heat Treatment of Metals,2014,39(2):51—54.
[3]周霞,唐占飞,窦慧莉,等.CNG发动机凸轮表面接触疲劳失效分析[J].理化检验(物理分册),2009,45(S1):244—246.ZHOU Xia,TANG Zhan-fei,DOU Hui-li,et al.Surface Contact Fatigue Failure Analysis on the Cam of CNG Engine[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2009,45(S1):244—246.
[4]刘功威,张辉,方文超,等.高新94-1井钻杆本体刺漏原因和对策分析[J].长江大学学报(自科版),2013,10(8):95—96.LIU Gong-wei,ZHANG Hui,FANG Wen-chao,et al.High94-1 Well Drill Pipe Leakage of Reason and Countermeasure Analysis[J].Journal of Yangtze University(Nat Sci Ed),2013,10(8):95—96.
[5]张春婉,张国正,董会,等.S135钻杆本体刺穿失效分析[J].石油矿场机械,2009,38(12):65—75.ZHANG Chun-wan,ZHANG Guo-zheng,DONG Hui,et al.Washout Failure Analysis of an S135 Drill Pipe Body[J].Oil Field Equipment,2009,38(12):65—75.
[6]陈长青,李齐富,刘进田,等.127 mm S135型钻杆管体刺穿失效分析[J].石油矿场机械,2013,42(1):59—61.CHEN Chang-qing,LI Qi-fu,LIU Jin-tian,et al.Piecing Failure Analysis of127 mm S135 Drill Pipe[J].Oil Field Equipment,2013,42(1):29—61.
[7]余世杰,袁鹏斌,龚丹梅,等.S135钻杆刺漏原因分析[J].金属热处理,2011,36(S1):173—177.YU Shi-jie,YUAN Peng-bin,GONG Dan-mei,et al.Cause Analysis of S135 Grade Drill Pipe Washout[J].Heat Treatment of Metals,2011,36(S1):173—177.
[8]董会,薛艳,张国正,等.127.0 mm×9.19 mm G105钻杆失效分析[J].理化检验(物理分册),2009,45(S1):284—286.DONG Hui,XUE Yan,ZHANG Guo-zheng,et al.Failure Analysis of127.0 mm×9.19 mm G105 Drill Pipe[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2009,45(S1):284—286.
[9]王磊,胡锐,王新虎,等.S135钻杆钢在钻井液中的氧腐蚀行为[J].石油机械,2006,34(10):1—4.WANG Lei,HU Rui,WANG Xin-hu,et al.The Oxygen Corrosion Behavior of S135 Drill Pipe in Drilling Fluid[J].China Petroleum Machinery,2006,34(10):1—4.
[10]田伟,杨专钊,赵雪会,等.S135钻杆接头失效及腐蚀特征[J].理化检验(物理分册),2008,44(10):575—578.TIAN Wei,YANG Zhuan-dao,ZHAO Xue-hui,et al.Study on Property of Corrosion and Failure for S135 Drill Rod Joints[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2008,44(10):575—578.
[11]董晓明,田青超.S135钻杆失效分析[J].理化检验(物理分册),2007,43(9):476—479.DONG Xiao-ming,TIAN Qing-chao.Failure Analysis of S135 Drill Pipe[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2007,43(9):476—479.
[12]崔顺贤,刘永刚,叶顶鹏,等.水平井S135钻杆本体断裂原因分析[J].理化检验(物理分册),2009,45(S1):299—302.CUI Yong-shun,LIU Yong-gang,YE Ding-peng,et al.Fracture Failure Analysis on S135 Drill Pipe in Horizontal Well[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2009,45(S1):299—302.
[13]周卫东,夏泊如,李罗鹏,等.钻井液对钻杆接头冲蚀规律的试验研究[J].石油机械,2009,39(10):1—4.ZHOU Wei-dong,XIA Bo-ru,LI Luo-peng,et al.Experimental Study on Erosion of Drilling Fluid to Drill Pipe Joints[J].China Petroleum Machinery,2009,39(10):1—4.
[14]王磊.S135钻杆钢氧腐蚀和腐蚀疲劳影响因素的研究[D].西安:西北大学,2006.WANG Lei.Study on Influencing Factors of S135 Drill Pipe Steel Oxygen Corrosion and Corrosion Fatigue[D].Xian:Northwestern Polytechnical University,2006.
[15]刘婉莹,曾德智,施太和,等.S135钻杆的腐蚀疲劳断裂失效分析[C].第十五届全国疲劳与断裂学术会议摘要及论文集.广东:[出版者不详],2010:35—36.LIU Wan-ying,ZENG De-zhi,SHI Tai-he,et al.Corrosion Fatigue Fracture Failure Analysis of S135 Drill Pipe[C].Summary of the Fifteenth National Symposium on Fatigue and Fracture.Guangdong:[s.n.],2010:35—36.