乙二醇再生系统工艺创新性改造

Technologically innovative transformation of MEG recovery system

目前国内缺乏对深水油气田开发中乙二醇回收装置的研究,为了充分认识和准确把握乙二醇再生回收系统在深水天然气开采中的作用,以中国深水天然气开采工艺中具有代表性的南海东部海域的乙二醇回收装置作为研究对象,分析了该系统在使用过程中的重沸器、贫乙二醇冷却器频繁内漏事件和系统内各滤器严重结蜡现象。研究结果表明:①脱水单元重沸器内漏为设备选型缺陷所致;②贫乙二醇冷却内漏为工艺缺陷所致;③系统未设计有除蜡功能是各滤器出现严重的结蜡现象的根本原因。结论认为,通过再生装置系列流程改造及创新优化可确保乙二醇回收装置的正常运行,提高乙二醇回收装置的稳定性和可靠性,保证了水下生产系统的安全运行,为以后的操作和技术研究积累了经验,为设备和工艺的制造和研究奠定了一定的实践基础。

So far,China is still a lack of study on monoethylene glycol(MEG)recovery devices used to develop deepwater oil and gasfields.In order to sufficiently recognize and accurately understand a role of MEG recovery system playing in deepwater gas exploitation,this study took some glycol recovery devices in eastern South China Sea,representative exploitation technology for deepwater gas in China,as objectives to analyze frequently internal leakage in reboilers and lean MEG coolers,and various phenomenon of serious wax deposit in filters.Results show that(1)one internal leakage within the reboiler of dehydration units is caused by a defect to select equipment type;(2)another internal leakage in the lean MEG cooler is caused by some technological defects;and(3)serious wax deposit is basically caused by no function of wax removal.In conclusion,for this MEG recovery system,its process transformation and innovative optimization can ensure a normal operation,improve stability and reliability,and guarantee safe operation in underwater production.In addi tion,much experience has been accumulated for future operation and technological research,and may provide a certain practical foundation for equipment&technology manufacturing and study.