渗透率及压力对低渗油藏CO_2驱油效率的影响  

Influence of permeability and pressure on CO_2 displacement efficiency in low permeability reservoir

作　　者：郭平[1] 黄宇[1] 李向良[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石化胜利油田分公司地质科学研究院,山东东营257000

出　　处：《断块油气田》2013年第6期768-771,共4页Fault-Block Oil & Gas Field

基　　金：国家重点基础研究发展计划(973)项目"温室气体提高石油采收率的资源化利用及地下埋存"(2006CB705800)

摘　　要：注CO2开发油气田是一种有效提高油气采收率的技术手段,但由于CO2驱油成本较高,分析储层是否适合注CO2,其驱油方式的可行性研究至关重要。地层渗透率和压力保持水平对CO2驱油效率影响较大,因此,通过室内长岩心物理模拟实验,研究了在不同渗透率和压力保持水平条件下CO2驱油效率、驱替压差及气体突破时机的变化情况。结果表明:驱替过程中驱替压差随渗透率的降低而增大,驱油效率和气体突破时间也都随渗透率降低而增大;随压力保持水平升高,CO2突破时间越长,驱油效率也越高。CO2 injection in the development of oil and gas field is an effective technology for EOR. It is essential to analyze the feasihility of CO2 injection for the reservoir due to high cost of CO2 injection. Previous study has showed that the permeability and pressure of reservoir have great influence on CO2 displacement efficiency. Thus, long core tests have been done to study how CO2 displacement efficiency, pressure difference and breakthrough time vary with permeability and pressure of reservoir. The result shows that pressure difference goes up with permeability decreasing within a certain permeability range, CO2 displacement efficiency and breakthrough time is inversely directly proportional to permeability. As pressure becomes high, both CO2 breakthrough time and displacement efficiency are increasing.

关 键 词：渗透率 压力 长岩心实验 驱油效率 CO2驱 

分 类 号：TE355[石油与天然气工程—油气田开发工程]