气田水回注处理工艺技术探讨

DISCUSSION ON GAS-FIELD WATER REINJECTION TECHNOLOGY

目前气田水的处理方法主要是回注地层。从蜀南气矿的回注情况分析,回注效果的好坏一方面取决于回注井回注层的渗透性与有效储集空间的大小,另一方面取决于回注水质情况,主要是地层水组分、水中悬浮物、氧化物与回注井地层岩石的配伍情况。以碳酸盐岩枯竭气藏为目标,论述了回注井的选择原则和回注水水质的处理方法,并以纳8井为例探讨了回注工艺技术,应用文中的方法不仅可以确保正常回注,而且可以大幅度降低回注工程建设费用和生产运行成本,对提高有水气藏采收率有重要意义。

At present, the primarily processing method about gas-field water is to inject them into stratum. On the basis of analysis of gas-field water reinjection instance in Shunan Gas Field, the effects of reinjection rest with the permeability of reinjection well and the dimension of reservoir interspace, as well as the quality of reinjection water. This paper discusses the selection principle of reinjection well and the processing method of reinjection water quality based on carbonatite depleted gas reservoir, and presents the reinjection technology taking well Na 8 as example. Using the paper′s method could not only ensure the normal reinjection, but also could reduce construction cost of reinjection engineering and production cost. This has important significance for enhancing recovery ratio of water bearing gas reservoir.