克拉玛依油田五_2西区油藏气水交替驱方案设计

Project Design for Gas Drive of Lower Karamay Reservoir in West District No.5-(2), Karamay Oilfield

针对克拉玛依油田五2西区克下组油藏设计了23个气驱方案并预测了各方案的开采动态指标,通过数值模拟对注气年限、日注气速度和气水交替周期等注入参数进行了敏感性分析论证。研究结果表明,五2西区克下组油藏在气水交替驱开发方式下,气水交替周期的长短不是开发动态影响的敏感因素;气水交替年限和日注气速度对注气增产油量和气换油率影响较大。与注水开采相比,注气开采能够较大幅度提高原油采收率,是改善高含水油藏开采效果的有利手段。

Twenty two gas-drive projects for Lower Karamay reservoir in west District No.5-（2） are designed with individual production performance index prediction for each project. Sensitivity analyses of each gas injection duration, gas injection rate and gas-water alternation cycle are made with numerical simulation method. The results show that by gas-water alternation displacement process, the sum of cycles is not sensitive factor to the production performance, but the gas-water alternation duration and gas injection rate have great effects on gas-injection incremental oil production and gas injection oil production reduction ratio. And the gas drive process is an effective way to improve the reservoir behavior with high water cut and can be applied for great increase of oil recovery compared with waterflooding process.