【摘要】 采用有限元法对不同载荷工况下的储气井进行应力计算,得到了交变应力幅值的分布云图。通过分析储气井上最大交变应力幅值可能出现的位置,得到了上口扭矩(过盈圈数)对储气井疲劳性能的影响规律。研究认为:外露螺纹槽内或套管与管箍啮合的第一螺纹牙根部易发生疲劳失效;上扣扭矩对疲劳失效出现的位置影响较大,对最大交变应力幅值的变化影响较小;将过盈圈数控制在3圈之内,储气井不易出现疲劳失效现象。更多还原

【Abstract】 Making use of the FEA method,the stress of gas storage well under different load cases was calculated to obtain the distribution of cyclic stress amplitude. Through analyzing the possible position of largest cyclic stress amplitude in gas storage well,the influence of make-up torque on the fatigue performance of gas storage well was caught. The research results show that the fatigue failure usually appears on the exposed thread groove or the first thread root of the mesh point between casing and pipe hoop; and the make-up torque greatly influences the position where fatigue failure appeared and it influences the range of the largest cyclic stress amplitude little. Having interference ring number controlled within 3 rings doesn’t result in fatigue failure in the gas storage well.更多还原