西北油田联合站中采出水余热回收工艺设计与应用

Design and Application of Waste Heat Recovery Process of Produced Water in Northwest Oilfield Combined Station

西北油田某联合站原油经过沉降脱水后,进入水区进行除油、除杂质处理。但处理后的采出水蕴含大量的热量,直接回注地下造成了热能大量浪费,同时高温采出水对外输玻璃钢管线造成高温损害,易导致管线老化失效,频繁发生刺漏。为了解决上述问题,设计两种采出水余热回收工艺方案,采用换热器工艺为进站稀油加热;在方案一的基础上,采用热泵技术深度提取采出水余热。通过投资、节约能耗等方面的综合分析,最终确定方案一为最优解决方案,可实现采出水余热的资源化利用,减少进站加热炉消耗的天然气量,延长外输管线使用寿命,保证塔河油田后期高效注水开发。

After sedimentation and dehydration,the crude oil of a combined station in northwest oil field enters the water area for oil removal and impurity removal.However,the treated produced water contains a large amount of heat,which is directly injected into the ground,resulting in a large amount of waste of heat energy.At the same time,the high-temperature produced water transmission glass steel pipe line causes high-temperature damage,which is easy to lead to aging and failure of the pipeline and frequent leakage.In order to solve the above problems,two kinds of recovery process schemes of produced water waste heat are designed,in which the heat exchanger process is used to heat the incoming thin oil;on the basis of scheme one,the heat pump technology is used to deeply extract the produced water waste heat.Through comprehensive analysis of investment,energy saving and other aspects,the first plan is finally determined as the optimal solution,which can realize the resource utilization of produced water waste heat,reduce the natural gas consumption of the heating furnace in the station,extend the service life of the export pipeline,and ensure the high-efficiency water injection development in the later stage of Tahe oilfield.