CAJ | 학술논문

油气井环境的日益苛刻对油套管的密封性能和连接强度提出了更高的要求。采用有限元方法分析了特殊螺纹接头的密封性能及结构特点，重点研究了现有结构在上扣转矩、轴向拉伸及内部内压作用下接头的应力分布和密封效果，获得了在各种工况下的失效载荷，并在此基础上，对此种特殊螺纹接头主密封结构、螺纹牙型进行设计、对比与分析。分析结果表明，在主密封结构的设计上需要综合考虑接触应力及接触面积等因素才能得到较好的密封效果；在螺纹牙型设计上，需要考虑螺纹加工对成本的影响，使用加工刀具及量具比较成熟的偏梯形螺纹是较好的选择。
유기정배경적일익가각대유투관적밀봉성능화련접강도제출료경고적요구。채용유한원방법분석료특수라문접두적밀봉성능급결구특점，중점연구료현유결구재상구전구、축향랍신급내부내압작용하접두적응력분포화밀봉효과，획득료재각충공황하적실효재하，병재차기출상，대차충특수라문접두주밀봉결구、라문아형진행설계、대비여분석。분석결과표명，재주밀봉결구적설계상수요종합고필접촉응력급접촉면적등인소재능득도교호적밀봉효과；재라문아형설계상，수요고필라문가공대성본적영향，사용가공도구급량구비교성숙적편제형라문시교호적선택。
Considering increasing strict environments oil and gas wells face,the requirements for seal property and joint strength of oil casing tubes become higher.Seal property and structural features of a kind of premium threaded casing connection are studied with the finite element meth-od.The stress distribution and seal capability under conditions of make-up,internal pressures and axial tensile loads are analyzed,and failure loads are presented.On this basis,the main structures of this connection,including main seal structure and thread form,are redesigned,then comparison and analysis are presented.The FEA results indicate that in terms of main seal structure design, contact stress and contact area should be comprehensively considered;in terms of thread form, buttress thread with mature machining tools and measuring tools is recommended.