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注水合格率是评价和保证油藏开发效果的一项重要指标。地层的注水压力变化之后,要重新达到稳定的注水状态需要一定的时间,这种稳定过程的体现就是地层吸水的滞后特性。地层注水的滞后性是一个时间性的问题,要想掌握滞后特性,就必须进行长时间的监测或调控。选择不同井网类型的19口井58个层段进行监测和分析,统计结果表明,58个层段中稳定时间小于2h的占81%,稳定时间在2~3h的占19%,注水井水量稳定时间段在各套井网和不同地层渗透率中均有分布,并没有明显的规律可循,它不仅与地层性质、连通状况,更重要的是与地层压力饱和程度相关。关井后恢复注水一段时间后再进行测调更加合理。通过58个层段的监测,正常注水状况下,各层段基本都能在3h以内达到稳定状态,因此建议测调后要稳定3h后再进行流量的检配。
The qualification rate of water injection is an important index for evaluating and ensuring the effectiveness of reservoir development. Stratum water pressure changes, to re-achieve a steady state of water injection takes some time, the stability of the process is reflected in the formation of water hysteresis characteristics. Hysteresis of formation water injection is a temporal issue, in order to grasp the hysteresis, it must be a long time monitoring or regulation. 58 wells of 19 wells of different well types were selected for monitoring and analysis. The statistical results showed that the stability time in 58 wells was 81% less than 2h, the stabilization time was 19% in 2-3h, the water volume in water injection well There is no obvious regularity for the stable time period distribution in each well pattern and in different formation permeability. It is not only related to formation property and connectivity but more importantly, it is related to formation pressure saturation. It is more reasonable to resume waterflooding after the well is shut down for some time. Through the monitoring of 58 layers, under normal water injection conditions, all layers can basically reach the steady state within 3h, so it is recommended to adjust the flow for 3h after the measurement.