水侵识别技术在水驱气田的应用

Application of Water Intrusion Identification in Waterflooding Gasfield

不稳定试井法可以对水驱气藏水侵的强弱进行早期识别。随着气藏开发的进行,针对海上水驱气田多层合采的气井见水后,产水层位及类型难以识别的问题,建立BF图版,并将其应用于水驱气田开发领域。根据水分析化验资料绘制出不同层位的离子浓度分布BF标准图版,将单井离子分布图与BF标准图版进行比对,可以对多层合采井的出水层位进行有效识别,弥补了部分井因生产测井测试资料有限而难以进行水侵识别的不足,为气藏控水治水提供有效依据。同时,根据生产数据建立了拟均质砂岩气藏的水侵特征图版,判断合采井的驱动类型。综合应用不稳定试井识别法、BF图版、水侵特征图版等手段,实现了产水规律有效识别,对复杂水驱气藏的合理开发具有重要意义。

Transient well test can be used to identify the water intrusion degree of waterflooding gas reservoir in the early development stage.With the progress of gas reservoir development,a BF plate was established and applied in the development of waterflooding gasfield to improve the identification of water production interval and water breakthrough pattern for the multi-layer gas production wells in the offshore gasfield.A standard BF plate with the ion concentration distribution of various layers was prepared according to the formation water test data.The water production interval for the multi-layer gas production well can be effectively identified through the comparison between single-well icon concentration distribution and the standard BF plate.This plate could identify the water intrusion for some gas wells without production logging and test data and could provide a basis for the water control and treatment of gas reservoir.In addition,a characteristic water intrusion plate for the pseudo-homogeneous sandstone gas reservoir was established to judge the driving pattern of multi-layer production well.The transient well test,BF plate,characteristic water intrusion plate was comprehensively applied to effectively identify the water production pattern,which is of great significance for the efficient development of complex waterflooding gas reservoir.