深水海管并联集输系统段塞联合接收技术

Joint slug receiving technology for parallel gathering system of deepwater pipeline

深水油气开发中通常采取多条混输海管分别由不同水下生产系统回接至同一中心平台处理,不同海管的运行状态不同,清管、停输再启动或增加输量等瞬态操作将会产生体积巨大的段塞,影响平台上部流程运行。根据段塞缓冲体积计算公式,针对2种深水海管并联集输系统,从流动保障角度提出了段塞联合接收策略:优化段塞接收方式,将平台上部所有段塞接收设备联合起来,配合工艺流程调节,共同应对某一条海管的严重段塞流工况;或优化组合各海管运行状态,合理规划海管系统操作参数、步骤和时机,从而减少海管系统总体段塞缓冲体积。以某深水气田为例,对比了应用该技术前后段塞缓冲体积及段塞接收设备尺寸的变化,结果表明:在保障段塞流安全平稳接收的前提下,段塞联合接收技术可大大节省平台空间和工程投资。

When deepwater oil gas is developed, multiple mixed subsea pipelines are generally tied back to one processing center platform from different subsea production systems. Different subsea pipelines are different in running state. Slug of great volume can be induced by transient operation, such as pigging, re-start and ramp-up, and consequently the operation on the topside of platform is impacted. According to the surge volume calculation formula, two joint slug receiving strategies were proposed from the point of flow assurance for two parallel gathering systems of deepwater pipelines. Firstly, slug receiving mode is optimized. All slug receiving equipments on the topside of platform are combined to cope with the severe slug flow of a certain subsea pipeline by coordinating the slug receiving process. And secondly, various running states of subsea pipelines are optimally combined. Operation parameters, procedures and timing of subsea pipeline systems are planned rationally to reduce the total surge volume. Finally, a certain deepwater gas field was taken as an example to compare surge volume and slug receiving equipment size before and after the application of this joint slug receiving technology. It is indicated that this technology can save greatly platform space and engineering investment while receiving of slug flow is kept safe and stable.