摘要
塔河油田原油采收率偏低,底水能量衰竭,亟需探索扩大水驱波及体积与提高采收率.根据塔河油田四区地质资料和生产动态资料,应用物理模拟相似准则,设计并制作碳酸盐岩缝洞型油藏三维立体储层仿真模型,开展油藏底水能量不足条件下转注水驱注水方式优选及后续注气驱提高采收率技术实验.结果表明:3种注水补充能量方法中,周期注水和脉冲注水提高采收率幅度相近,分别为16.39%和16.48%,均高于恒速注水的14.05%,而周期注水的总注水量小于脉冲注水的总注水量,优选周期注水为更有效的注水补充能量方法;转注水驱后的注氮气驱中,气水交替驱可提高采收率25.92%,优于连续注气驱的23.47%.这为碳酸盐岩油藏高效开发提供技术依据.
Low initial recovery factor and depleted bottom water supply of Tahe oilfield calls for urgent methods to improve sweep volume and to enhance oil recovery.According to the similarity theory,a three-dimensional fractured-vuggy carbonate reservoir model was developed based on the geological features and production performance of Tahe oilfield.Water injection methods were optimized and nitrogen flooding for EOR was conducted.Results show that among the three water injection methods,intermittent water injection and pulse water injection could achieve a similar oil recovery,16.39% and 16.48%responsively,which were higher than that of constant water injection 14.05%.Since the total water injection volume of intermittent water injection was less than that of pulse water injection,the former was selected as the more effective water injection method for energy supplement.In addition,for the subsequent N2 flooding,the incremental oil recovery of water alternating gas(WAG)flooding 25.92% which was higher than that of continuous nitrogen flooding 23.47%.These results could supply technical support for the high efficiency exploration of carbonate reservoir.
出处
《东北石油大学学报》
CAS
北大核心
2015年第6期102-110,7-8,共9页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05014-003)
国家重点基础研究发展计划973(计划)项目(2011CB201006)
国家自然科学基金项目(51504268)
中国石油大学(北京)科研基金项目(2462014YJRC053)
关键词
缝洞型碳酸盐岩油藏
剩余油
波及体积
氮气驱
提高采收率
塔河油田
fractured-vuggy carbonate reservoir
residual oil
swept volume
nitrogen flooding
enhanced oil recovery
Tahe oilfield
