摘要
随着深海油气资源的开发,海底管道的蜡沉积问题使得深水管道流动安全保障面临巨大威胁。蜡沉积的出现不仅会降低管道的输送效率,严重时还会导致蜡堵或者停输事故。为了深入研究某海底管道的蜡沉积情况,采用LedaFlow软件中改进的MWP动力学蜡沉积模型,利用实验析蜡曲线、PVTsim软件计算曲线以及Multiflash软件计算曲线分别进行蜡沉积的模拟,得到了海底管道沿线的蜡沉积、压力以及温度等参数的变化情况,并进行了清管的模拟。结果表明:采用实验析蜡曲线与软件计算曲线得到的管道最大蜡沉积厚度达到2 mm的时间都保持在2~3 d,水下管汇处的压力最大上升了0.075 MPa,当最大蜡沉积厚度达到4 mm时,模拟得到的水下管汇处的压力最大上升了0.104 MPa;对管道最大蜡沉积厚度为2 mm和4 mm时分别进行清管操作,清管后水下管汇处的压力分别下降了0.016 MPa和0.076 MPa。
With the development of deep-sea oil and gas resources,the problem of wax deposition poses a huge threat to the safety of deepwater pipeline flow assurance.Wax deposition will not only reduce the transmission efficiency of the pipeline,but also cause wax blockage or pipeline shutdown accidents in severe cases.In order to deeply study the wax deposition of a subsea pipeline,the improved MWP kinetic wax deposition model in LedaFlow software was adopted.The wax deposition experiment curve,the software PVTsim calculation curve and the Multiflash calculation curve were used to simulate the wax deposition respectively,and the changes of the wax deposition,pressure and temperature along the subsea pipeline were obtained,and the pigging was simulated.The results show that the time when the maximum wax deposition thickness of the pipeline obtained from the experimental wax precipitation curve and the software calculation curve reaches 2 mm is maintained at 2~3 d,the pressure at the underwater manifold increases by a maximum of 0.075 MPa;when the maximum wax deposition thickness reaches 4 mm,the simulated pressure at the underwater manifold increases by a maximum of 0.104 MPa.The pipeline pigging was carried out when the maximum wax deposition thickness of the pipeline was 2 mm and 4 mm respectively,and the pressure at the underwater manifold dropped by 0.016 MPa and 0.076 MPa respectively after the pigging.
作者
吴小路
孙译徵
曹学文
徐龙
WU Xiaolu;SUN Yizheng;CAO Xuewen;XU Long(Shenzhen Branch of CNOOC China Limited,Shenzhen 518000,China;China University of Petroleum(East China),Qingdao 266580,China;CNOOC Inspection Technology Co.,Ltd.,Tianjin 300452,China)
出处
《石油工程建设》
2021年第3期13-19,56,共8页
Petroleum Engineering Construction
