Abstract: The offshore natural gas condensate wellhead platform has the characteristics of limited space, far from land, no permanent staff and high maintenance cost, which poses a higher challenge to the desanding equipment and technology. In order to solve this problem, a compact tubular sand removal equipment with small volume is proposed.The performance of the sand removal device is evaluated with pressure drop, mass separation efficiency and particle separation efficiency as evaluation indicators. The results show that the mass separation efficiency increases rapidly in the process of the separation chamber diameter changing from D1 to 2D1. Continuing to expand the diameter of separation chamber, the increasing trend of mass separation efficiency decreases and the pressure drop of sand remover increases rapidly; The desander with two⁃stage separation structure has obvious improvement in separation performance, and the mass separation efficiency has been increased by more than 20%. Comparing the particle size of separated gravel with the critical particle size of pipeline carrying sand and the critical particle size of wellhead safe operation, it can be concluded that the separation efficiency of large grain gravel can reach more than 80%, and the tubular desander can complete the pre⁃separation task of offshore wellhead platform gravel.

Key words: Natural gas, Wellhead, Tube desander, Performance evaluation, Offshore platform

摘要： 海上天然气凝析液井口平台具有空间有限、远离陆地、无人员常驻、设备维护成本高等特点，对除砂设备与工艺提出了更高的挑战。针对这个问题，提出了一种结构紧凑、体积小的管式除砂设备，并以压降、质量分离效率、粒级分离效率为评价指标对除砂器性能进行了评价。结果表明，分离室直径由D1发展为2D1的过程中，质量分离效率提升较快。继续对分离室扩径，质量分离效率升高趋势减缓，除砂器压降迅速增大；除砂器采用二级分离结构对分离性能的提升较为明显，质量分离效率提升20%以上。将分离后的砂砾粒径与管道携砂临界粒径、井口安全运行临界粒径进行比较，大粒径砂砾的分离效率达到80%以上，管式除砂器可以完成海洋井口平台砂砾预分离任务。

关键词: 天然气凝析液, 井口, 管式除砂器, 性能评价, 海洋平台