摘要
针对高含水油藏水驱效率低,不流动区域无法波及等问题,利用微观可视模型,研究了CO2超越水的驱油机理、油膜运移特征以及CO2与原油间传质过程,并提出了CO2驱替不连通区域的驱替机制。实验结果表明,在CO2驱油过程中,原油中的蜡不断在孔喉处沉积并堵塞孔喉,CO2可以超越孔道中水的阻碍进一步驱替残余油,通过柱面流和柱状流两种流动方式将其中的原油驱替出来,且由于CO2中分子聚集现象的存在,使其具有较强的溶解原油的能力,可从原油中萃取轻烃组分,对原油中重质组分具有一定的溶解能力。
Aiming at problems of low or no efficiency of water flooding in high water cut reservoirs or stagnant zones,the present paper studied the mechanism of supercritical CO2 miscible flooding,migration characteristics of oil film and the mass transfer process between CO2 and oil by using a high-speed,advanced and visualized camera micro-simulation model,by which the displacement mechanism of transient blind side was observed,and the film migration phenomenon and the mixed phase were also seen. The results have shown that the wax in crude oil continues to be deposited at pore throats and chock up throats,while supercritical CO2 can surpass water hindrance in pores and further flood the residual oil away in the form of both the cylindrical and columnar flow. Supercritical CO2 has a strong ability to dissolve oil due to the occurrence of molecular aggregation within it. What is more,it could extract not only light hydrocarbon components but also certain heavy hydrocarbon components from crude oil. Thus,supercritical CO2 is a kind of good miscible agents for flooding crude oil.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2010年第5期797-800,共4页
Acta Petrolei Sinica
基金
国家重点基础研究发展规划(973)项目(2006CB705804)资助
关键词
高含水
二氧化碳驱油机理
油气超越
残余油
分子聚集
high water-containing
CO2 flooding mechanism
overrunning of oil ＆ gas
residual oil
molecular aggregation
