摘要
CO2混相驱是提高低渗透油藏采收率最有前景的方法之一,CO2最小混相压力是注CO2开发的一个重要参数,只有当驱替压力高于最小混相压力时才可能达到混相驱。所研究油田属于特低渗透油田,本文采用两种方法针对原油进行了注CO2最小混相压力实验。当采用界面张力法时,发现随着压力的增加,地层原油与CO2间界面张力逐渐下降,并在约33-34MPa时达到混相状态;当采用细管实验方法时,确定的最小混相压力值为32.2MPa。由此获得的注CO2驱油的最小混相压力值可为油藏开采和油气生产提供重要参考。
CO2miscible drive is one of the most promising method to improve the recovery of low permeability reservoirs, CO2 minimum miscibility pressure is an important parameter in the development of CO2 injection, only when the driving pressure higher than the minimum miscibility pressure , it is likely to be miscible. The researched oil field belongs to low permeability oil fields, this paper adopt two methods to do minimum miscibility pressure of CO2 injection experiments for crude oil. When using surface tension method, we found that as pressure increases, formation interracial tension between crude oil and CO2 decreased, and in about 33-34MPa, it reached the mixed-phase state; when using small tube experimental method, the determined value of minimum miscibility pressure is 32.2MPa. The result of injection of CO2 displaceable oil value of minimum miscibility pressure provides an important reference of reservoir exploitation for oil and gas production.
出处
《价值工程》
2010年第3期31-32,共2页
Value Engineering
关键词
CO2混相驱
最小混相压力
界面张力
细管实验
CO2 miscible phase recovery
minimum miscible pressure
interfacial tension
tube experience
