海底管道砂沉积模拟研究

Numerical Simulation of Sand Depositional Rule in Subsea Multiphase Pipeline

海底混输管道运行一段时间后,管道内部砂沉积等会导致管道通过量减小,明显降低缓蚀剂效率,加速管道底部磨蚀,甚至造成清管器卡堵事故。以位于海上某油田群A平台至B平台的海底混输管道为基础,根据现场实际数据合理建模,采用FLUENT软件进行数值模拟,研究了海底管道水平段以及弯管段在砂含量、砂粒径、砂密度以及流速等参数不同时的砂沉积规律。模拟结果表明,海管沿程沉砂量与含砂量、砂粒径、砂密度正相关,与流速负相关;而沉砂量最大位置规律相反。平均沉砂量对各参数的敏感性从高到低依次为含砂量、流速、砂粒径、砂密度。

Sand deposit will be formedinside of subsea muhiphase pipeline after operating for a period of time. which will lead to diminution of passable area. reduction of inhibitor efficiency, acceleration of corrosion, and even cause lhe PIG block accidents, lu riffs article, the geometrical model and physical model with field dataare set up building upon the suhsea ntuhiphase pipeline from platform A to B in a group of offshore oil and gas fields. Numerical simulations by FI.UENT are performed in order to study the sand depositional rule of straight section and bend section according to the variation of parameters such as sand content, particle size, density and flow rate. The research shows that sand depositional amount is positive correlative with and content, particle size, density and negative with flow rate, and the rule of sand depositional maximum position is opposite. The sensitivity of parameters to average sand depositiona[ amount is sand conlent, flow rate, particle size and density from high to low.