萨尔图油田北二西区特高含水期注水开发效果评价

Evaluation of Water Injection Enhancement at Super-High Water Cut Stage in Beierxi Area of Saertu Block

结合大庆萨尔图油田北二西块目标区的开发实践,通过对存水率、综合含水、耗水量以及采收率等指标的计算,对北二西目标区域注水开发效果进行了评价,找出了其主要问题和矛盾,为进一步提高开发效果、挖掘剩余油提供了一种思路。计算结果表明,随着采出程度的增加,注入水排出量变大,注水开发效果变差,随着找水、堵水的进行,关闭高含水井,注水利用率有所改善;根据目前的开发状况,预测北二西区块的最终采收率可达45%。

Combined with the development operations in Beierxi block, Saertu, Daqing Oilfield, thewater injection enhancement was evaluated and the major problems and contradictions have been identifiedby calculating remaining water ratio, composite water cut,water consumption and recovery degree. The result will provide theoretical guidance for enhancing development effect and recovers the residual oil. Theresult shows that with the increase of recovery, the injected water discharge becomes more and development effect becomes worse. With the proceeding of locating and shutting off water, and high water cut wells shutting in the utilization of injected water ratio was improved. Based on the current development status, it predicts that the final recovery efficiency of Beierxi block will be 45 %.