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Replacement and Cleaning of Deserted Inshore Oil and Gas Pipelines

机译：更换和清理废弃的近海油气管道

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摘要

Because of many engineering projects of the sea-beach industrial district of ZGBXrnoffshore oil and gas field under construction, the routes of two oil and gas pipelinesrnwhich pass through the district must be deserted and alternated. Considering thatrntheir recovery would inevitably obstruct the construction of the industrial district andrnalso be expensive, it is reasonable for the deserted pipelines to stay in the originalrnlocation. However, there was a large amount of oil and gas remained in the desertedrnpipelines, which would bring great hidden danger to the large scale construction ofrnthe industrial district. Thus the deserted pipelines had to be replaced and cleaned.rnThen according to the practical situation of the deserted pipelines, a treatmentrnmethod for them to be replaced with pig and seawater prior to being washed withrnchemical agents was proposed. Based on the characteristics of the remained crudernoil, the safe replacement time was determined. Focus on the cleaning quality,rnoperability and costs, environmental requirements, the technological and economicrnfeasibility of the cleaning methods for seawater, a single chemical agent and threernkinds of chemical agents with a pig train were compared and analyzed, and then anrnoptimal cleaning plan for the deserted pipelines was determined. Based on thernevaluation of the oil dissolving capability and amount used, the corrosion andrnenvironmental pollution for chemical agents, an economical and effective cleaningrnagent was screened. Then a replacement and cleaning plan for the deserted pipelinesrnwas proposed and its realization was very successful. The results show that the safetyrnshutdown time for the deserted oil-gas combined pipeline and crude oil pipeline arern89.8h and 54.9h respectively, and their replacement operation should be finishedrnwithin 24h; the cleaning method of the single chemical agent is better than the others,rnand emulsified cleaning effect of the agent AQ-12 is the best; the replacement andrncleaning operation was completed by using the designed plan successfully.
机译：由于ZGBXrn海上油气田海底工业区的许多工程项目正在建设中，穿过该区的两条油气管道的路线必须荒芜并交替。考虑到它们的恢复将不可避免地阻碍工业区的建设并且也很昂贵，对于废弃的管道来说，将其保留在原始位置是合理的。但是，废弃的管道中仍然残留了大量的石油和天然气，这将对工业区的大规模建设带来巨大的隐患。然后，根据废弃管道的实际情况，提出了在用化学试剂清洗之前用生猪和海水代替它们的处理方法。根据残留的嘧菌腈的特征，确定安全的更换时间。着眼于清洁质量，耐用性和成本，环境要求，海水清洁方法的技术和经济可行性，对一种化学试剂和三种化学试剂用猪车进行比较和分析，然后制定了荒废的最佳清洁计划确定了管道。通过对油溶性和用量的综合评价，对化学试剂的腐蚀和环境污染进行筛选，筛选出一种经济有效的清洗剂。然后提出了废弃管道的更换和清洁计划，该计划的实现非常成功。结果表明，废弃的油气联合管道和原油管道的安全停机时间分别为89.8h和54.9h，更换作业应在24h内完成。单一化学药剂的清洗方法优于其他化学药剂，AQ-12药剂的乳化清洗效果最好。成功使用设计方案完成了更换和清洁操作。

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