川西气田地层水与储层配伍性研究

Compatibility of Both Formation Water and Reservoir in Some Gasfields,Western Sichuan Basin

川西须家河组气藏和沙溪庙组气藏地层水产量大、矿化度高,目前最有效的处理方式是异层回注处理。但对不同气藏的地层水同时进行回注时,要保证回注成功和回注系统正常运行,必须对水质进行配伍实验。针对川西地区须家河组气藏与沙溪庙组气藏地层水的水质特征和储层特性,进行水质、储层配伍性实验,从而了解影响回注效果的因素,提出了地层水回注过程中的注意事项与解决措施。

In western Sichuan Basin, both Xujiahe and Shaximiao formations are characterized by large production of formation water and high salinity. So far, the effective way to solve these two problems is to reinject at the different layers. An experiment on water-quality compatibility is needed during simultaneous reinjection for different gas reservoirs in order to keep a normal and successful reinjection. So, the experiment on compatibility of both water quality and reservoir was just carried out for both Xujiahe and Shaximiao formations. And the factors influencing reinjection were well known. At last, some attentions and countermeasures against formation-water reinjection were also provided.