双涡街法测量饱和蒸汽干度研究

Double Vortex Measurement of Saturated Steam Dryness

注汽热采是稠油油田开采的主要手段,此方法开采的效率主要取决于蒸汽干度的高低。经研究表明,在注入相同的蒸汽量的情况下,蒸汽的干度越大,采收率越大,油汽比越高。只有较高干度值的饱和蒸汽才能对稠油有很强的驱动效果。但是干度太高,会使注汽锅炉水中的盐份大量附着在炉墙壁上,致使锅炉结垢,降低锅炉的热效率,甚至危及锅炉的运行安全;干度太低,通过管道传送到井底后干度就更低了,无法有效驱动稠油层,达不到开采稠油目的。可见,对饱和蒸汽的干度值进行实时、准确测量具有重要意义。然而,现今国内外仍无工程上实用的干度仪,使其具有实时测量、准确度高、寿命长、造价低的性能,针对此问题提出了基于双涡街联合法测量湿饱和蒸汽干度的方法。

The steam injection thermal recovery is key method to develop heavy oil fields.The recovery efficiency of this method mainly depends on the dryness fraction of steam.In the situation of injecting the same quantity of steam,the dryness fraction of steam is higher,the recovery efficiency and oil/gas ratio are higher.Only saturated steam with higher dryness fraction has driving effect on heavy oil.However,if the dryness fraction is too high,a lot of salt in the water will attach on inner wall of the boiler,which can reduce thermal efficiency of the boiler,even affect safe run of the boiler.If the dryness fraction of steam is too low,it will be lower when reaching the bottom of well through pipeline,and the steam will not effectively drive the heavy oil layer.So to measure the dryness fraction of saturated steam accurately and timely is very important.But there is still not dryness measurer for the practical engineer at home and abroad at present.In order to solve the problem,the measurement method of dryness fraction of steam based on double vortex street has been put forward.