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普光气田是我国首个特大型高含硫酸性气田,随着气田的不断开采,集输工艺管道腐蚀问题日益突出。基于德国Zwick/Roell Z250拉伸试验机开展L360管道钢应力-应变参数测试实验,采用solid186单元对含缺陷腐蚀管道进行建模,基于非线性有限元隐式积分算法与塑性失效准则,分析了腐蚀缺陷参数对高含硫输气管道极限承载能力的影响规律,并通过静水压爆破试验,验证了模型的正确性。结果表明:缺陷对高含硫输气管道强度的影响主要表现为局部应力集中;缺陷深度系数对高含硫输气管道极限承载能力影响最大,缺陷长度系数影响次之,缺陷宽度系数影响最小。研究成果为普光气田高含硫输气管道剩余强度评价提供了理论依据。
Puguang Gas Field is the first large-scale high-sulfur acid gas field in our country. Along with the continuous exploitation of gas field, the corrosion of gathering pipeline has become increasingly prominent. Based on the German Zwick / Roell Z250 tensile testing machine to test the stress and strain of L360 steel pipe, solid186 element was used to model the corrosion-containing pipeline. Based on the nonlinear finite element implicit integration algorithm and plastic failure criterion, Defect parameters on the ultimate bearing capacity of high sulfur gas pipeline, and through the hydrostatic test, the correctness of the model is verified. The results show that the defects mainly influence the local stress concentration on the strength of gas pipelines with high sulfur content. The depth factor of defects has the greatest effect on the ultimate bearing capacity of high sulfur gas pipelines, followed by the defect length coefficient and the defect width coefficient. The research results provide a theoretical basis for the evaluation of the residual strength of high-sulfur gas pipelines in Puguang Gas Field.