基于地层压力恢复时间的注采比数值模拟优化方法——以肯基亚克某亏空油藏为例

Injection-production ratio optimization based on numerical simulation and formation pressure recovery time: a case study of depleted reservoirs in Kenkyak Oilfield

针对肯基亚克某边底水油藏地层压力下降过快、能量不足的问题,开展了数值模拟研究。利用物质平衡法研究了亏空油藏压力恢复速度与注采比之间的关系,在此基础上优化亏空油藏注采比。首先优选最佳地层压力恢复时间,然后优化油藏提液幅度,最终优选合理注采比。结果表明:反九点井网下,该油藏最佳压力恢复时间为2 a;最佳恢复压力为原始地层压力的90%;最佳提液幅度为25%;最佳注采比为1.63。按此注采比进行生产,有效提高了该亏空油藏的采收率。

Considering the quick decline of the formation pressure and shortage of energy of a depleted reservoir in Kenkyak Oilfield,the study of numerical simulation has been conducted.In order to optimize the injection-production ratio of this reservoir,material balance method was used to study the relationship between the depleted reservoir pressure recovery rate and the injection-production ratio.In the study we firstly determined the best formation pressure recovery time,and then we optimized the reservoir liquid extracting amplitude.Finally the injection-production ratio was optimized.This optimization method is beneficial for enhancing oil recovery.Our study finds that the best formation pressure recovery time is two years and the best recovery pressure is ninety percent of initial formation pressure.In the study,liquid extracting amplitude is determined as twenty-five percent and the injection-production ratio of inverted nine spot flooding pattern is 1.63.According to this ratio,the recovery of this deficit reservoir has been increased efficiently.