注CO_2气驱提高采收率效果影响因素分析

• 作 者: 王刚 杨胜来
• 机 构: 中国石油大学石油工程教育部重点实验室,
• 出 处: 内蒙古石油化工
• 发表日期: 2009年10期
• 关键词: 气驱 CO_2 CO2驱油 数值模拟 提高采收率 地质参数 影响因素 注气 含油饱和度 油藏地质

目前油田常规注水开发难度不断增加,应用注CO2气驱技术能够有效解决注水困难等问题,提高了原油采收率。在室内实验研究的基础上,应用数值模拟技术优化了注气方式及注气时机;分析了油藏地质参数对注CO2气驱提高采收率的影响。研究表明:水气交替注入方式更优;非均质性越强,开发效果越差;油藏渗透率越大、含油饱和度越高、原油粘度越低,注CO2驱油效果越好。

At present, the difficulty of conventional water injection development in the oilfield is constantly increasing. Application of carbon dioxide flooding technology can effectively solve the problems of water injection and improve the recovery rate of crude oil. Based on the laboratory experiments, the gas injection method and gas injection timing were optimized by numerical simulation. The effect of reservoir geological parameters on CO2 recovery by gas flooding was analyzed. The results show that: the alternate injection of water and gas is better; the stronger the heterogeneity is, the worse the development effect; the greater the reservoir permeability, the higher the oil saturation, the lower the viscosity of crude oil, the better the CO2 flooding.