中文摘要：

依照《ISO 13679：石油天然气工业套管及油管螺纹连接试验程序》进行实物试验并据此评价油管和套管特殊扣的性能,不仅耗时长而且成本高昂。为此,以？73.0 mm×5.51 mm J55钢级中低压力、中高温度的经济型气密封特殊扣为例,基于ABAQUS软件,通过建立有限元模型,在考虑仿真分析过程中的几何非线性、材料非线性和边界条件非线性耦合问题的基础上,依据弹塑性的双线性等向强化模型和超弹性Moony-Rivlin模型的材料本构关系,对上扣工况和ISO 13679的Ⅱ级试验B系载荷包络线工况进行了仿真评价,计算得到了各个工况下特殊扣的接触位移、最大接触压力、密封积分强度、等效应力等重要参数,其计算结果与实物密封试验结果的误差小于7.3%,对于密封性能的有限元分析结果与实验结果一致,进而利用上述参数评价了特殊扣在各工况下的结构与密封性能。结论认为,按照ISO 13679的试验内容和程序所建立的仿真评价方法,能够高效地对气密封特殊扣的性能进行评价,可以极大地节约时间成本与经济成本,能在一定程度上代替特殊扣的实物评价。

英文摘要：

It is time-consuming and costly to evaluate tubing and casing connections by conducting a full-scale test in accordance with ISO 13679：2002 - Petroleum and natural gas industries--Procedures for testing casing and tubing connections. Therefore, we explored a method through computer simulation by which an efficient evaluation was made on the gas-tight seal connections of casting and tubing in line with the test regulations of the ISO 13679. An indoor test was thus conducted on the economical J55-grade gas-tight seal connections with 073.0 mm×5.51mm. First, test procedures and methods for evaluating connections specified in the ISO 13679 were adopted, and the ABAQUS finite element analysis software was applied. Then, considering the geometric nonlinearity, material nonlinearity and boundary condition nonlinearity in the finite element analysis process, the material constitutive relation of elastop[astic biliuear isotro- pic model and hyperelastic Mooney-Rivlin model was applied to make simulation calculation of the working conditions of making up of connections and of level-II-Series B test/Test Load Envelope of ISO 13679, And, the key parameters were obtained including contact displacement, maximum contact pressure, seal-integrated intensity and equivalent stress of the connections under different working con- ditions. On this basis, an effective evaluation was made on structures and sealing properties of connections under different working con- ditions. The simulation results agreed so well with the full-scale test results with an error less than 7.3%. Finally, the above parameters were applied in simulated evaluation of connections＇ structures and sealing performances under different working conditions. In conclusion, this simulation evaluation method based upon the test content and procedures of ISO 13679 is more feasible and economical than a full-scale test in the evaluation of gas-tight connections.