曹妃甸油田变径海底管道清管的可行性

Feasibility of pigging operations in submarine adjustable pipelines in Caofeidian Oilfield

为了对曹妃甸油田3条变径海底混输管道实施清管,以其中的WHPE至WHPD海底管道为例,对其清管的可行性进行研究。研制了蝶片直板清管器,其蝶片密封盘具有较好的密封性、柔韧性及耐磨性,通过能力强,可以双向运动,能够适应于变径海底管道清管作业。通过模拟清管过程可知:曹妃甸油田变径海底管道清管是可行的,采用蝶片直板清管器可以较好地完成该管道的清管,清管平均速度为0.8 m/s,清管时间为5 990 s,清管过程中管道入口压力最大值为2.64 MPa,远小于管道入口设计压力与清管器承受压力。辨识出WHPE至WHPD变径海底管道清管的主要风险,并制定相应的应对措施,清管风险可控,安全性较好。研究结果为变径海底管道的完整性管理与风险评价提供了指导。

To perform pigging operations in three submarine adjustable mixed transportation pipelines in the Caofeidian Oilfield, feasibility studies have been performed in the pipeline from WHPE to WHPD. With outstanding sealing performances, flexibility, abrasion resistance, high accessibility and capability for movements in both directions, the butterfly sealing plates in newly developed butterfly straight pig may be used in pigging operations of submarine adjustable pipelines.Through simulation of pigging processes, it is found that to perform pigging operations in submarine adjustable pipelines in the Caofeidian Oilfield is possible. Satisfactory pigging operations with average speed of 0.8 m/s and duration of 5 990 s can be implemented by using the butterfly straight pig. The maximum inlet pressure of the submarine pipeline during pigging is 2.64 MPa, significantly lower than the designed inlet design pressure of the submarine pipeline and working pressure of the pig. In addition, main risks have been identified for pigging operations in submarine adjustable pipeline from WHPE to WHPD. At the same time, relevant countermeasures have been proposed. In this way, risks in pigging operations can be controlled properly to achieve desirable operation safety performances. The reasearch results can provide guidance for integrity management and risk identification of submarine adjustable pipelines.