注CO2驱提高致密砂岩气藏采收率实验及数值模拟
Experiment and numerical simulation of enhancing recovery of tight sandstone gas reservoir by CO2 injection
廖海婴1
作者信息
- 1. 中国石化石油勘探开发研究院,北京 100083
- 折叠
摘要
针对致密砂岩气藏地层压力下降快、稳产难度大、采收率较低等问题,利用长岩心驱替实验、可视化实验和数值模拟方法,从提高气藏采收率方面对注CO2的驱替特征和扩散特征进行了研究.结果表明:地层中的超临界CO2不是与天然气大范围地互溶,而是"部分互溶";由于重力分异作用,CO2在沉降过程中驱替天然气向上运移并被采出;CO2驱替天然气可提高采收率17.8百分点.研究成果可为下一步致密砂岩气藏CO2驱矿场试验提供理论依据.
Abstract
In view of problems of rapid formation pressure drop,difficult production stabilization and low gas recov-ery of tight sandstone gas reservoirs,long core flooding experiment,visualization experiment and numerical simula-tion are performed to study displacement and diffusion characteristics of CO2 injection from aspect of enhancing re-covery of gas reservoir.The results show that supercritical CO2 is not widely but"partially miscible"with natural gas.CO2 displaces natural gas upward to be produced during its settlement due to gravitational differentiation.Gas recovery is increased by 17.8 percentage points through CO2 injection.The research provides theoretical basis for further implement of CO2 flooding field test of tight sandstone gas reservoirs.
关键词
CO2驱/致密气藏/砂岩气藏/可视化实验/提高采收率/数值模拟Key words
CO2 flooding/tight gas reservoir/sandstone gas reservoir/visualization experiment/enhanced gas recovery/numerical simulation引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据