塔河油田高含硫伴生气管道腐蚀主控因素的关联分析

Correlation Analysis on the Main Controlling Factors on Corrosion of High Sulfur Associated Gas Pipeline in Tahe Oilfield

为了有效地对塔河油田高含硫伴生气管道腐蚀穿孔的腐蚀因素进行关联性分析,利用多相流瞬态模型计算管道流动参数,提出了Pearson相关系数与Apriori关联规则挖掘算法相结合的方法,以确定影响腐蚀穿孔的关联性规则。结果表明:多相流瞬态模型揭示了管线温度、压力、流速、持液率沿程的规律;介质参数和流动参数对腐蚀的影响程度为:持液率(0.732)>温度(0.696)>压力(0.677)=CO_(2)分压(0.677)=H_(2)S分压(0.677)>气体流速(0.618)=气体壁面剪切力(0.618)>管道倾角(0.577);确定了腐蚀速率与H_(2)S分压、温度、持液率、流速和管道倾角之间的强关联规则;采用高温高压动态反应釜试验验证了关联规则的正确性。

To make an effective correlation analysis on the factors influencing the corrosion and perforation of high sulfur associated gas pipeline in Tahe Oilfield,the pipeline flow parameters were calculated using multiphase flow transient model,and a method combining Pearson correlation coefficient with Apriori association rule mining algorithm was proposed to determine the associativity rules that affecting corrosion perforation.Results showed that the multiphase flow transient model revealed the variation laws of pipeline temperature,pressure,flow rate,and liquid holdup along the pipeline.Meanwhile,the degrees of influences of medium parameters and flow parameters on corrosion were as follow:liquid holdup(0.732)>temperature(0.696)>pressure(0.677)=CO_(2)partial pressure(0.677)=H_(2)S partial pressure(0.677)>gas flow rate(0.618)=gas wall shear force(0.618)>pipe inclination(0.577).The strong correlation rules between the corrosion rate and H_(2)S partial pressure,temperature,liquid holdup,flow rate and pipeline inclination were determined.Besides,the correctness of the association rules was further verified by the high temperature and high pressure dynamic reactor experiment.