油田高含水期无效水治理对策研究及效果评价

Research and Effectiveness Evaluation on Technology of Invalid Water Treatment at the Later Stage of High Water Cut

东部某油田V区块1976年投入开发,目前已经进入了高含水开发后期,综合含水已达到93%以上。经过长期注水开发,储层内部油水分布复杂,水油比逐年升高,注水低效、无效循环问题日趋严重,产量递减逐年加大。为此,近两年将该区块做为治理无效水循环重点试验区,以深化储层认识为工作重心,主要通过发展和完善堵水、调剖主导工艺技术,开展深度大剂量的调剖、堵水先导性试验,优化储层注采结构。总结形成一套适合高含水开发区提高水驱油效率,减少无效水循环的成熟配套技术,提高区块整体开发水平,并为同类油藏深化稳油控水工作提供了借鉴方法。

Putting into production and having water cut of more than 93 %, the block V of a certain oilfield in the east of China is currently in the later stage of high water-cut development. After long - term injection, the produc- tion declined resulting from the complex distribution of water and oil in the reservoir, increasing WOR with years, more serious low - efficiency of water flooding and inefficiency of water circulation. In recent years, taken deepening the understanding on reservoir as the working focus, overall investigating dynamically and statically proving as the guidance, the block, therefore, become the major experimental plot for managing water circulation inefficiency to carry out the profile control with large dose and pilot experiment of water plugging for optimizing injection - produc- tion structure of reservoir by means of water plugging and profile control technologies. It is concluded that a set of mature technologies is formed to enhance water flooding of high water - cut development zone and to decrease ineffi- ciency of water circulation. It improves the level of overall development of the block and provides the experience for increasing recovery and controlling water in the same reservoir.