Study on corrosion rule of crude oil gathering pipeline under high H2S and CO2 environment
H2S and CO2 in crude oil will cause corrosion damage to the pipe wall,and the study of its corrosion pattern can provide guidance for field personnel to take preventive and control measures.Taking a crude oil pipeline in Changqing Oilfield as the research object,a corrosion model of crude oil pipeline with high content of H2S and CO2 was established,and the influence of different factors on the corrosion pattern of the pipeline was analyzed.The results showed that in the process of on-site pipeline maintenance and inspection,attentions should be paid to the corrosion of the pipe wall at the inlet,the descending section at the outlet and the middle of the ascending section at the outlet.When the crude oil H2S and CO2 content was high,the change of its content had little influence on the corrosion condition along the pipeline.With the increase of the crude oil transport flow,the corrosion rate along the pipeline had certain extent of increase.The change of fluid temperature in the range of 20℃to 70℃had little impact on the corrosion rate along the pipeline,but the fluid temperature increased to above 80℃could effectively reduce the corrosion rate of the pipeline.The change of crude oil moisture content(volume fraction)in the range of 10%to 70%had little impact on the corrosion rate of the pipeline.When the moisture content of crude oil reached 90%,the corrosion rate along the pipeline was greatly reduced.
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