陈猛,余世杰,欧阳志英,徐昌学.某井5″钻杆刺漏原因分析[J].表面技术,2020,49(4):347-355.
CHEN Meng,YU Shi-jie,OUYANG Zhi-ying,XU Chang-xue.Analysis of the Causes of a 5″ Drill Rod Leakage in a Well[J].Surface Technology,2020,49(4):347-355
某井5″钻杆刺漏原因分析
Analysis of the Causes of a 5″ Drill Rod Leakage in a Well
投稿时间:2019-06-10  修订日期:2020-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2020.04.041
中文关键词:  钻杆  刺漏  腐蚀坑  氧腐蚀  应力集中  失效分析
英文关键词:drill pipe  leakage  corrosion pit  oxygen corrosion  stress concentration and failure analysis
基金项目:
作者单位
陈猛 上海海隆石油管材研究所,上海 200949 
余世杰 上海海隆石油管材研究所,上海 200949 
欧阳志英 上海海隆石油管材研究所,上海 200949 
徐昌学 上海海隆石油管材研究所,上海 200949 
AuthorInstitution
CHEN Meng Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China 
YU Shi-jie Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China 
OUYANG Zhi-ying Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China 
XU Chang-xue Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China 
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中文摘要:
      目的 对某井5″钻杆刺漏形成原因进行分析。方法 对刺漏钻杆样品的材料进行化学成分分析、力学性能测试、金相分析、晶粒度评价、非金属夹杂物评价,对刺孔周边的裂纹进行金相分析、断口宏观分析和扫描电镜分析,对腐蚀坑底部的腐蚀产物进行EDS分析,对钻杆刺穿机理进行模拟分析,对刺漏钻杆受力情况进行有限元模拟分析。结果 该刺漏钻杆的化学成分、力学性能符合API Spec 5DP—2009标准要求,其中冲击韧性较高(两支刺漏钻杆的冲击功分别为83 J和87 J),是技术标准的2倍以上。刺漏钻杆样品的组织为回火索氏体,为正常调质态的组织形貌。刺漏钻杆样品晶粒度级别为9级,非金属夹杂物等级最高为1.0级,符合产品技术标准要求。该刺漏钻杆外壁存在大量的腐蚀坑,而且在腐蚀坑底部存在氧元素的腐蚀产物,即存在氧腐蚀。刺孔延伸裂纹及其周边的裂纹扩展较为平直,而且在裂纹尖端存在疲劳辉纹形貌,证实该刺漏扩展以疲劳裂纹的形式进行。结论 此次两支钻杆的刺穿属于早期腐蚀疲劳破坏,其产生的因素有:(1)钻井液中的溶解O对钻杆外壁腐蚀较为严重,形成较深的腐蚀坑;(2)在通过严重狗腿度井段时,腐蚀坑底部萌生了小裂纹,随后裂纹在旋转弯曲作用力下疲劳扩展直至刺透钻杆壁厚;(3)对此井下过井的钻杆进行严格的检测,防止有缺陷的钻杆下井使用,以避免发生早期失效现象。
英文摘要:
      To analyze the causes of 5″ drill pipe leakage in a well, the materials of drill pipe samples were analyzed by chemical composition analysis, mechanical properties test, metallographic analysis, grain size evaluation and non-metallic inclusion evaluation, the cracks around the drill hole were analyzed by metallographic analysis, fracture macro analysis and scanning electron microscopic analysis, the corrosion products at the bottom of the corrosion pit were analyzed by EDS, the drill pipe penetration mechanism was simulated and analyzed. The finite element simulation analysis was carried out. The chemical composition and mechanical properties of the drill pipe meet the requirements of API Spec 5DP—2009 standard. The impact toughness of the drill pipe is higher (the impact energy of the two drill pipes is 83 J and 87 J respectively), which is more than twice the technical standard; the structure of the drill pipe sample is tempered sorbite, which is the normal tempered structure morphology; the grain size of the drill pipe sample is 9 grades, and the non-metallic inclusion. The highest grade is 1.0, which meets the requirements of product technical standards; there are a lot of corrosion pits on the outer wall of the drill pipe, and there are corrosion products of oxygen element at the bottom of the corrosion pit, that is, oxygen corrosion; the extension crack of the piercing hole and its surrounding cracks are relatively straight, and there are fatigue striations at the tip of the crack, which proves that the piercing propagation is carried out in the form of fatigue cracks. The penetration of the two drill pipes belongs to early corrosion fatigue damage. The causes are as follows: (1) Dissolved O in drilling fluid corrodes the outer wall of the drill pipe seriously and forms deep corrosion pits; (2) Small cracks are sprouted at the bottom of the corrosion pit when passing through the severe dogleg section, and then fatigue cracks propagate under rotating bending force until they penetrate into the wall thickness of the drill pipe; (3) In order to prevent the early failure of defective drill pipes, rigorous detection of drill pipes passing through the well is carried out.
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