摘要
为了探讨油藏注空气的氧化机理,在原油氧化实验的基础上,建立了低温氧化动力学模型,运用热采数值模拟技术,研究了高含水期油藏注空气后含油饱和度、温度、气体运动和原油粘度的变化规律,对比了烟道气成分和注入气体对采收率的影响。模拟结果表明,注空气后含油饱和度明显降低,氧化前缘的最高温度可达190℃,原油消耗氧气量为589 m^3/m^3(标准状况下)。氧气在到达生产井之前基本耗尽,注空气驱油技术是安全的。注空气形成的烟道气中N_2与CO_2体积比越小,采收率越高。
Air injection low temperature oxidation （LTO） process is a novel technique for enhanced oil recovery （EOR） in light oil reservoirs. In order to study the mechanism of air injection LTO, the kinetic model of LTO process under reservoir conditions is presented on the basis of crude oxidation experiments. Using thermal recovery numerical simulation technique, the variation of oil saturation, temperature, gas migration and oil viscosity after air injection in high water cut reservoir is studied, and the effects of flue gas composition and injected air on recovery ratio are compared. The result shows that oil saturation after air injection decreases obviously, the maximum temperature of oxidation front is up to 190~C, and oxygen consumption per cubic meter of crude oil is 589 m3 at normal condition. All the oxygen is cofisumed before it reaches the production well, so air injection is safe and guaranteed. The smaller N2/CO2 volume ratio in the flue gas is, the higher recovery ratio will be.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2009年第3期358-361,共4页
Xinjiang Petroleum Geology
基金
中国石化科技项目
空气泡沫调驱提高采收率技术实验研究(G04CY-06-S-09)资助
关键词
轻质原油
注空气
低温
氧化反应
机理
烟道气
数值模拟
light crude oil
air injection
low temperature
oxidation
mechanism
flue gas
numerical simulation
