提高大庆油田喇二浅冷装置生产能力的探索

A case history of improving the productivity of the La-2 shallow condensing plant in the Daqing Oilfield

大庆油田采油六厂地区近年来湿气产量远高于前几年的预测值,喇二浅冷装置处理能力相对不足,造成该地区天然气放空量增大。通过分析装置流程及工作机理,找到了影响浅冷装置生产能力的主控因素,认识到降低压缩机出口到二级三相分离器总压降将会提高装置的处理量。结合现场实际情况,针对4处压降较大的部位制订了调整机后空冷器运行方式、改造压缩机出口管线、改造丙烷蒸发器流程、更换乙二醇混合器等措施。通过计算得出,项目实施后装置压降降低40%,湿气处理量和轻烃产量均有明显增加。

Wet gas production in recent years is far higher than the value predicted a couple of years ago at the No.6 Gas Recovery Plant of the Daqing Oilfield,where the La-2 shallow condensing plant can not meet the current processing requirement any more,resulting in a surge of venting gas in this area.In view of this,through an analysis of this plant's flow process and working principles,the main controlling factors influencing this plant's productivity are found and it is realized that the reduction of accumulative pressure drop from the outlet of an compressor to the two-level three-phase separator will improve this plant's processing capacity.In combination with the actual condition in this plant,some measures have been taken as follows: the operation mode of the aftercooler of compressor was adjusted at the four locations with comparatively larger pressure drop,the outlet tubes and lines of the compressor were modified,the flow process of the propane evaporator was reformed,the ethylene glycol mixer was renewed,and so on.It is calculated that this plant's total pressure drop is decreased by 40% after all those above measures having been taken for an innovation of this plant and both its wet gas processing volume and the produced light hydrocarbon quantity increase obviously to a high degree.