材料性能对钻杆腐蚀疲劳寿命影响的试验研究

doi:10.7623/syxb200902029

石油学报 ›› 2009, Vol. 30 ›› Issue (2): 312-316.DOI: 10.7623/syxb200902029

• 石油工程 • 上一篇

材料性能对钻杆腐蚀疲劳寿命影响的试验研究

WANG Xinhu^1,2, KUANG Xianren^1,2, LÜ Shuanlu³, LU Qiang³

1. CNPC Tubular Goods Research Center, Xi'an 710065, China;
2. CNPC Key Laboratory for Mechanical and Environmental Behaviors of Tubular Goods, Xi'an 710065, China;
3. PetroChina Tarim Oilfield Company, Korla 841000, China

收稿日期:2008-03-02 修回日期:2008-05-12 出版日期:2009-03-25 发布日期:2010-05-21
作者简介:王新虎,男,1962年6月生,1992年毕业于西北工业大学研究生院,现为中国石油管材研究所油井管研究室总工程师,高级工程师,主要从事石油管工程技术服务、产品开发、科学研究与失效分析工作.E-mail:wangxh66@163.com
基金资助:
中国石油天然气集团公司应用基础研究项目(04A40402)资助

Experimental study on influence of material property on corrosion fatigue life of drill pipes

1. 中国石油天然气集团公司管材研究所, 陕西西安, 710065;#br# 2. 中国石油塔里木油田分公司, 新疆库尔勒, 841000

1. CNPC Tubular Goods Research Center, Xi'an 710065, China;
2. CNPC Key Laboratory for Mechanical and Environmental Behaviors of Tubular Goods, Xi'an 710065, China;
3. PetroChina Tarim Oilfield Company, Korla 841000, China

Received:2008-03-02 Revised:2008-05-12 Online:2009-03-25 Published:2010-05-21

摘要/Abstract

摘要：

API SPEC5D标准规定的材料性能指标不能反映钻杆抵抗疲劳及腐蚀疲劳的性能。对4个厂家的S135钢级钻杆的材料进行了腐蚀疲劳寿命试验、拉伸性能试验及成分分析。试验结果表明,虽然4种钻杆的化学成分及材料性能都符合标准要求,且材料的拉伸强度基本相同,但腐蚀疲劳寿命相差很大。腐蚀疲劳断口观察及断裂机理分析表明,腐蚀疲劳裂纹扩展机理是阳极溶解与氢致开裂共存,氢致开裂加快了疲劳裂纹扩展。材料低倍组织酸洗检验、显微组织分析表明,4种钻杆的金属组织特别是低倍组织有明显差别。低倍组织反映了成分偏析程度、夹杂物含量及分布等。成分偏析及夹杂物导致材料的阳极溶解、特别是氢致开裂速度加快,所以是腐蚀疲劳寿命减少的主要原因。油田数据验证,钻杆材料的低倍组织酸洗检验可作为间接评定钻杆材料腐蚀疲劳性能的方法。

关键词: 钻杆, 腐蚀疲劳, 材料性能, 裂纹扩展, 材料结构, 评定方法, 试验研究

Abstract:

The material requirements specified by API SPEC 5D could not show the ability of drill pipes in resisting fatigue and corrosion fatigue.The corrosion fatigue life,the tensile property and the chemical ingredient of drill pipes produced by four factories were tested.Although the chemical composition and property of materials conformed to meet the standard requirement,and the material strength of drill pipes from four factories were almost same,the corrosion fatigue life and fatigue mechanism of the materials for drill pipes from four factories were very different.The observation of corrosion fatigue fracture and analysis of crack mechanism indicated that the corrosion fatigue of the drill pipes was resulted from the anodic dissolution and hydrogen-induced crack together.The hydrogen-induced crack accelerated the fatigue crack progress.The material macrostructure was inspected by acid eroding method,and metallurgical microstructure was analyzed.The metallurgical microstructure,especially macrostructure of the drill pipes from 4 factories was also different.The metallurgical macrostructure showed the degree of metal chemical element segregation and the amount of inclusion which resulted in the decrease of corrosion fatigue life,due to acceleration of the anodic solution and hydrogen induced-crack of metal.The data of drill pipes in oilfields proved that the material macrostructure inspected by acid eroding method might assess indirectly the material property such as corrosion fatigue life of drill pipe.

Key words: drill pipe, corrosion fatigue, material property, fatigue crack progress, material structure, assessment method, experimental study

中图分类号:

TE921.207

王新虎, 邝献任, 吕拴录, 卢强. 材料性能对钻杆腐蚀疲劳寿命影响的试验研究[J]. 石油学报, 2009, 30(2): 312-316.

WANG Xinhu, KUANG Xianren, LÜ Shuanlu, LU Qiang. Experimental study on influence of material property on corrosion fatigue life of drill pipes[J]. ACTA PETROLEI SINICA, 2009, 30(2): 312-316.

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材料性能对钻杆腐蚀疲劳寿命影响的试验研究

Experimental study on influence of material property on corrosion fatigue life of drill pipes

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