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天然气管道在停输泄压进行焊接修复时涉及到惰性气体置换,残余油气的爆炸极限作为置换程度的重要判据,在残余油气隔离技术中残余油气的蒸汽压与凝析油系统中主要易燃物质的燃烧特性直接影响油气隔离技术的参数确定。笔者在对长庆油田榆林地区三个采气厂的凝析油样品成分分析的基础上,得出在天然气置换动火时必须将管道内残余油气含量控制在0.859%以内以及油气隔离设备至少承压0.1 MPa才能保证安全施工的结论,对舍凝析油系统的天然气管道置换动火、管道油气隔离技术有重要意义。
Natural gas pipelines involved in inert gas replacement during shutdown and pressure relief, and the explosion limit of residual oil and gas as an important criterion for the degree of displacement. The residual vapor pressure in the residual gas separation technology is similar to that of the main flammable gas in the condensate system Material combustion characteristics directly affect the parameters of oil and gas isolation technology. On the basis of the composition analysis of condensate samples of three gas recovery plants in Yulin area of Changqing Oilfield, the author concludes that the residual hydrocarbon content in the pipeline must be controlled within 0.859% during natural gas exchange fire and the oil and gas separation equipment should at least support Pressure 0.1 MPa in order to ensure the safety of the conclusions of the condensate condensate condensate gas system to replace the dynamic fire, pipeline gas separation technology is of great significance.