Abstract: The properties of DongfangYangpuHaikou and DongfangSanya pipeline natural gas were analyzed, the content of CO2 was 4.94%(mol) and 8.21%(mol) respectively, which was more than 3%(mol) required in standard (Q/SY 30—2002). The content of H2S was 25.2 mg/m3 in the DongfangSanya pipeline natural gas, which was also more than standard of 20 mg/m3. So, the chemical corrosion of DongfangSanya pipeline was serious. By the test of sulfate reducing bacteria cultivating, sulfate reducing bacteria corrosion was proved in DongfangYangpuHaikou pipeline, although it was very slight.

Key words: Natural gas,    ,  Transmission pipeline,    , Corrosion,    , Carbon dioxide,    ,  Sulfureted hydrogen

摘要： 对东方 - 洋浦 - 海口和东方 - 三亚管输天然气气质进行分析, 结果表明, CO2 气体摩尔分数分别为4. 9 4% 和8. 2 1%, 大于中国石油企业标准( Q / S Y3 0—2 0 0 2) 要求的3%。东方 - 洋浦 - 海口天然气的 H2S含量较低, 东方 - 三 亚 H2S的质量浓度为2 5. 2m g /m3, 高于标准要求的2 0m g /m3。因此, 东方 - 三亚输气管道 H2S和CO2 化学腐蚀较 重。通过硫酸盐还原菌培养实验证明东方 - 洋浦 - 海口管线存在硫酸盐还原菌腐蚀, 但腐蚀较轻。

关键词: 天然气, 长输管道, 腐蚀, 二氧化碳, 硫化氢