钻探工程2024，Vol.51Issue(1)：15-22,8.DOI:10.12143/j.ztgc.2024.01.003
钻柱腐蚀疲劳寿命评价和影响因素分析
Evaluation and influence factors analysis on corrosion fatigue life of the drill string
摘要
Abstract
It is easy for drill string to be cracked when it is subjected to complex forces.Evaluating the corrosion fatigue life of drill string according to the actual situation on site can provide a basis for the safe use of drill string.By calculating the axial force,cyclic stress and fatigue limit of the drill string in the wellbore,the fatigue evaluation methods of drill string based on fatigue coefficient,drill string tension and rotation counting are determined,and the influence of acidic fluids is considered.The results show that the increase of the bending stress and buckling will lead to the fatigue failure of the drill string when drilled with severe dogleg.The remaining service life of the drill string will be greatly reduced when the corresponding ROP is reduced and the rotating speed is increased significantly.When severe acid corrosion occurs,the remaining service life of the drill string will be rapidly reduced.The drill strings in the well section with high tension and large dogleg should be regularly shifted to ensure the safe and normal use of drilling string on site.关键词
钻柱/疲劳/腐蚀/屈曲/寿命评价/油气钻井Key words
drill string/fatigue/corrosion/buckling/life evaluation/oil and gas drilling分类
石油、天然气工程引用本文复制引用
苏堪华,刘德平,简旭,孙政,万立夫,卓云,余星颖..钻柱腐蚀疲劳寿命评价和影响因素分析[J].钻探工程,2024,51(1):15-22,8.基金项目
国家自然科学基金面上项目"耦合动力土反力作用的深水井口多轴疲劳理论和时变可靠度研究"(编号:51974052) （编号:51974052）
中石油川庆钻探工程公司重点科研项目"川东北地区高含硫气藏安全快速钻井技术研究"(编号:CQ2021B-46-Z1-3) （编号:CQ2021B-46-Z1-3）
