三元复合驱掺水系统结垢影响规律研究

在三元复合驱生产过程中,包括掺水管道、掺水炉等在内的地面掺水集输系统中存在严重的淤积、结垢,直接造成集输能耗上升,设备、管线极易损坏或寿命缩短等一系列威胁油田正常开发的生产难题。以大庆杏北油田三元复合驱开发区块为研究对象,分析了其地面掺水系统中的结垢物组成。并通过模拟试验研究了影响掺水系统结垢的因素与规律。结果表明,掺水系统中是集硅垢、碳酸垢、腐蚀垢等于一体的含油混合垢,且以硅垢为主,含量占到45%以上。掺水温度、掺水量、掺水压力及含聚浓度均对结垢有影响,但在三元复合驱集输系统正常生产工况条件下,含聚浓度对于垢质的沉积具有更显著的影响。500 mg/L左右的见聚浓度是结垢速率的高峰期。

Study on Influence Regulation of Scaling in Watering System by ASP Flooding Process

During the production process of Alkaline-surfactant-polymer(ASP) flooding,deposition and scaling problems are serious in ground watering & gathering system,such as watering pipeline and heating furnace.So some challenges oilfield development must face,such as energy consumption increase,equipments and pipelines are damaged easily,and service life shortens.The component of scale sample,which is took from ASP flooding area of Xingbei Oilfield in Daqing Oilfield,in ground watering system is investigated.And the influence factors and regulation of scaling in watering system are studied by simulation experiments.It is known that the scale sample is consists of silica scale,carbonate scale,corrosion scale and organic substance,and the content of silica scale is more than 45%.The watering temperature,flow rate,pressure and polymer concentration are factors of influencing scaling in watering system.And under the conditions of ASP flooding normal production,the effect of polymer concentration is prominent and 500mg/L around is the scaling peak.