工况外载条件下钛合金/钢钻杆接头有限元分析对比研究

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中文摘要：由于我国的优质天然气资源主要集中在深层及超深层,超深井的钻探对钻柱提出了更高的性能要求.钛合金钻杆由于具有高强、低密、耐蚀、抗疲劳、耐热和无磁性等优点,是超深层天然气钻柱的研究热点.本文使用三维有限元分析方法,对比研究不同外载条件下钛合金材料和钢钻杆材料对高承载钻杆接头承载性能和密封性能的影响,并分析高承载钻杆接头在工况下的失效方式和力学特性.结论表明:钛合金材料可以使钻杆接头的整体应力水平降低20%,抗扭能力提高约60%,但在同样扭矩上扣后螺纹接头的主台肩密封压力比钢制钻杆接头低15%～20%;当加载内压+拉伸+弯矩的复合载荷后,螺纹的最大危险点由外螺纹主台肩圆弧凹槽处转移到了在外螺纹主台肩侧第一圈齿根处,螺纹整体的应力水平增高,密封性能下降.因此为了满足超深井天然气井钻采需求,使用钛合金/钢钻杆复合钻柱时,可适当提高钛合金钻杆的上扣扭矩,提高螺纹接头的密封性能.

外文标题：Comparative Study of Finite Element Analysis on Titanium Alloy and Steel Drill Pipe Joints under External Loading Conditions

外文摘要：Due to the concentration of high-quality natural gas resources in deep and ultra-deep formations in China,drilling of ultra-deep wells presents higher performance requirements for drill strings.Titanium alloy drill pipes have become a research focus for ultra-deep natu-ral gas drill strings due to their advantages such as high strength,low density,corrosion resistance,fatigue resistance,heat resistance,and non-magnetic properties.In this study,a three-dimensional finite element analysis method is used to compare and investigate the effects of titanium alloy and steel drill pipe materials on the load-bearing and sealing performance of high load-bearing drill pipe joints under different external loading conditions.The failure modes and mechanical characteristics of the high load-bearing drill pipe joints under working condi-tions are also analyzed.The results show that the use of titanium alloy materials can reduce the overall stress level of the drill pipe joints by 20%and improve the torsional resistance by approximately 60%.However,under the same make-up torque,the sealing pressure of the main shoulder of titanium alloy joint is 15%～20%lower than that of the steel drill pipe joint.When subjected to composite loads of inter-nal pressure,tension and bending moment,the maximum critical point of the thread transitions from the fillet groove of the external thread shoulder to the first tooth root of the external thread shoulder.The overall stress level of the thread increases,while the sealing performance decreases.Therefore,to meet the requirements of ultra-deep natural gas drilling,when using a composite drill string of titanium alloy and steel drill pipes,it is recommended to appropriately increase the make-up torque of the titanium alloy drill pipe to improve the sealing per-formance of the thread joint.

外文关键词：

ultra-deep gas explorationtitanium alloy drilling pipehigh load-bearing jointthree-dimensional mechanicalfinite element analysiscomposite loads

作者：

张益铭、张建军、李晓、杨柳、李桂变、刘强、吴永清、马欣华、祝国川、尹成先

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作者单位：

中国石油集团工程材料研究院有限公司,油气钻采输送装备全国重点实验室陕西西安 710077

西安理工大学材料科学与工程学院陕西西安 710048

中国石油集团川庆钻探工程有限公司井下作业公司四川成都 610213

中国石油西南油气田公司物资分公司四川成都 610017

四川长宁天然气开发有限责任公司四川成都 610051

山西风雷钻具有限公司山西侯马 043009

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关键词：

超深井天然气开发钛合金钻杆高承载接头三维力学有限元分析复合载荷

基金：

国家重点研发计划中国石油科学研究与技术开发项目陕西省自然科学基金

项目编号：

2021YFB37008042021DJ27032021JM-607

出版年：

2024

DOI：

10.19459/j.cnki.61-1500/te.2024.03.009

石油管材与仪器

中国石油集团东方地球物理勘探有限责任公司

石油管材与仪器

影响因子：0.129

ISSN：1004-9134

年,卷(期)：2024.10(3)

参考文献量7