克拉玛依油田五_2西区克下组油藏气水交替驱开发效果预测及分析

Predicting and analyzing effects of water and gas alternate drive on oil production of Lower Kelamayi reservoir in the western Wu-Ⅱ area,Kelamayi oilfield

对克拉玛依油田五2西区克下组油藏实施气水交替驱开发效果进行了数值模拟预测及分析,其结果表明:与相同井网下注水开发效果相比,采用气水交替驱开发方式能够较大幅度提高原油采收率;在实施气水交替驱期间,不会产生严重的气窜现象而影响开采效果;采用气水交替驱开发方式,不仅注气增油持续时间较长,而且在注气期间和停止注气以后的较长时间内仍有相当比例的注入气存留于地层中,起到了很好的保持地层压力和增强溶解气驱的作用,从而提高了油层动用程度。

Numerical simulation predictions and comparable analyses were carried out for the effects of water and gas alternate drive on oil production of Lower Kelamayi reservoir in the western Wu-Ⅱ area, Kelamayi oilfield, resulting in some conclusions. Under an identical well pattern,the alternate drive of water and gas may enhance oil recovery more greatly than water flooding. During the alternate injection of water and gas,any severe gas breakthrough to influence production can not occur. In addition, this alternate drive can not only have a longer time with gas injection and higher oil production,but also keep a quite great part of injected gas within the reservoir,by to maintain reservoir pressure and to gas drive for increasing development which it enhance is likely dissolved of reserves.