摘要
提出以油井产出气(烃类与CO2混合气体)为对象,采用细管实验确定混相驱最小混相压力(MMP)及非混相驱过程中的驱油效率.研究了气体组成跨度较大情况下气体组成对MMP和驱油效率的影响,通过大量地实验观察和分析,将驱替过程分为3个阶段,并对相应过程的驱油机理、组成等对采收率的影响进行了分析,得出驱油效率随CO2摩尔分数、压力变化的趋势及数量关系.结果表明:CO2摩尔分数降低则混相压力提高。在非混相状态,CO2摩尔分数每提高10%,驱油效率提高3.0%～5.4%,平均为4.4%;注气压力对驱油效率有较大影响,注气压力每提高1MPa,驱油效率提高1.2%～3.0%,平均为1.8%.
Based on the well-produced gas, a mixture gas dominated by carbon dioxide, a slimtube experiment was employed to obtain the minimum miscibility pressure（MMP） and displacement efficiency. The effects of gas component on the MMP and displacement efficiency were studied under larger component changes. Through a great quantity of experimental observations and analysis, the process of displacement was divided into three phases. The oil displacement mechanism and the effects of composition on recovery were also analyzed. The relationship quantitatively and change tendency of displacement efficiency with the mole fraction of carbon dioxide and pressure were determined. The result shows that the MMP increased with the decreasing of mole fraction of carbon dioxide. In the processes of immiscible state, the displacement efficiency was increased by 3.0%-5.4% with an average value of 4.4% while mole fraction of carbon dioxide was increased by 10%. Injection pressure has distinct influence on displacement efficiency. The displacement efficiency was improved by 1.2 %-3. 0% while the injection pressure was increased by 1 MPa with an average value of 1.8%.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第2期249-253,共5页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2006CB705800)
关键词
气体组成
MMP
驱油效率
细管实验
gas component ； MMP； displacement efficiency； slimtube experiment
