C3断块K2t1注水外溢及合理注采比

针对C3断块K2t13边底水油藏地层压力长期得不到有效恢复的问题,在确定注水外溢时机的基础上,应用数值模拟方法研究了注采比、油水粘度比、注水时机、边水体积、注水井位置、地层倾角等因素对注水外溢的影响。利用统计回归方法建立了注水外溢的定量表征模型,进一步结合物质平衡原理开展了合理注采比研究。研究结果表明,注采比对C3断块K2t13油藏注水外溢的影响程度最大；受注水外溢的影响,随着注水量的增加,油藏有效注水并没有得到同步增加,甚至会降低；合理注采比研究结果表明,当注采比在1.8左右时,该油藏地层压力恢复速度才能达到最大值。

Study on K2t13 Injection Outflow and Reasonable Injection Production Ratio in C3 Fault Block

Aiming at the problem that the pressure of K2t13 reservoir with edge and bottom water in C3 fault block could not be effectively restored for a long time, based on the determination of injection outflow time, the influence of injection production ratio, oil-water viscosity ratio, injection time, edge water volume, injection well location, formation dip angle and other factors on injection outflow were studied by numerical simulation. The quantitative characterization model of water injection outflow is established by using statistical regression method. Furthermore, the reasonable injection production ratio was studied based on the principle of material balance. The results show that the injection production ratio has the greatest influence on the outflow of water injection in K2t1³ reservoir of C3 fault block. Affected by the outflow of water injection, with the increase of water injection, the effective water injection of the reservoir does not increase synchronously, or even decrease. The result of reasonable injection production ratio show that when the injection production ratio is about 1.8, the pressure recovery rate of the reservoir can reach the maximum value.