摘要
油田注水开发过程中受储集层非均质性、水油流度比、注采差异以及注入水长期的冲刷、剥蚀等影响,出现差异渗流现象,逐渐产生优势渗流通道,进而形成大孔道,表现为注入水快速突进、高注入孔隙体积倍数、强水淹、高采出程度、高水油比等特征。大孔道的形成,对流体运移起重要作用,影响并控制着剩余油分布。注入水大多从大孔道采出,水驱较弱的渗流区剩余油富集,因此,识别和预测优势渗流通道对寻找剩余油富集区具有重要意义。
Difference seepage occurs due to the reservoir heterogenous characteristics,water-oil mobility ratio,difference injection-produce intensity and long-term water-wash in water injection sandstone reservoir,gradually generate preferential path and finally form macroscopic throats.This phenomenon is reflected on the rapid breakthrough of injected-water,high injection pore volume multiple,high water-flooded,high ratio of total oil produced to OOIP,high water-oil ratio and so on.Especially,the appearance of macroscopic throats affects the distribution and formation of remain oil.Remaining oil enrichment area is located in the low water-flooded section because the most of injected water produces through the macroscopic throats.How to identify and forecast the preferential path is very important to finding remaining oil.
出处
《新疆石油天然气》
CAS
2009年第1期51-56,共6页
Xinjiang Oil & Gas
关键词
油田开发
优势通道
描述技术
剩余油
Oilfield development
Preferential path
Description of technology
Remaining oil
