特低渗透油藏CO_2非混相驱油机理研究  

The Study on CO_2 Immiscible Mechanism in Low Permeability Reservoir

作　　者：赵明国[1] 李金珠[1] 王忠滨[2] 

机构地区：[1]东北石油大学提高油气采收率教育部重点实验室,大庆163318 [2]胜利油田孤岛采油厂,东营257231

出　　处：《科学技术与工程》2011年第7期1438-1440,1446,共4页Science Technology and Engineering

摘　　要：针对大庆油田树101井区特低渗透油层,结合油藏条件,通过一系列室内实验,确定了CO2驱油机理。研究表明:随着CO2注入量增加,溶解油气比、体积系数和膨胀系数增大,黏度降低,束缚水体积膨胀。在27 MPa下注入CO2,地层油体积膨胀1.484 7倍,残余油饱和度降低11.43%,地层油黏度降低到原黏度的48.51%,束缚水体积膨胀1.132 4倍。同时当地层压力从27 MPa降低到原始地层压力后,依靠溶解CO2膨胀能,可采出原油15.49%。此外,注入CO2后,CO2-地层油的界面张力降低,CO2可使地层油中的轻质烃抽提和汽化,从而提高采收率。Because Shu101 well area of Daqing Oilfield is low permeability reservoir,with reservoir conditions,through a series of laboratory experiments,the CO2 flooding mechanism is determined.Research shows that with the increased CO2 injection,dissolved gas oil ratio,volume expansion coefficient and coefficient increases,viscosity decreases,bound water volume expansion.When injection CO2 with 27 MPa,1.484 7 times the volume expansion of oil formation,the residual oil saturation decreased 11.43%,formation of oil viscosity decreases the viscosity of 48.51% to the original,bound water volume expansion 1.132 4 times.At the same time reducing the formation pressure from 27 MPa to the original formation pressure,the expansion will depend on dissolved CO2 can be taken out of crude oil 15.49%.In addition,after the injection of CO2,CO2-formation reduces the interfacial tension of oil,CO2 can lead light hydrocarbons in the formation of oil extraction and vaporization,thereby improving oil recovery.

关 键 词：大庆油田 特低渗透油层 CO2 非混相驱 室内实验 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]