苏里格气田东区站场排液管线的腐蚀风险及其防治措施

Corrosion Risk and Prevention Measures for Drainage Pipeline in East Station of Sulige Gas Field

通过对苏里格气田东区站场排液弯管的腐蚀形貌观察、腐蚀产物检测和现场挂片试验,明确了弯管的腐蚀形式为冲刷腐蚀。利用多相流模拟软件对弯管处介质的分布特点、壁面剪切应力和冲蚀速率进行模拟,模拟结果表明:冲刷腐蚀的主要影响因素为介质流速和固相颗粒含量;弯管内弧主要受液相高流速产生的壁面剪切应力影响,外弧主要受固相颗粒的冲击磨损作用影响。根据苏里格东区站场排液弯管的腐蚀风险特点,推荐在高风险位置使用玻璃钢管或者陶瓷内衬弯管进行腐蚀防治。

It was determined that the corrosion form of the drainage elbow in the East station of Sulige gas field was erosion corrosion,according to the corrosion morphology observation,corrosion product detection and field coupon test.Multiphase flow simulation software was used to simulate the distribution characteristics of the medium,wall shear stress and erosion corrosion rate.The simulation results showed that the main influencing factors of erosion corrosion were medium velocity and solid particle content.The inner arc of the elbow was mainly affected by wall shear stress caused by high liquid flow rate,and the outer arc of the elbow was mainly affected by impact wear of solid particles.According to the corrosion risk characteristics of the drainage elbow in the East station of Sulige gas field,it was recommended to use glass fiber reinforced plastic pipe or ceramic lined elbow in high risk locations for corrosion prevention.