Adaptability Research of CO2 Drive Technology to Reservoir Rocks and Crude Oil in Low Permeability Reservoirs
To address the issue of reservoir adaptation and replacement effect during CO2 drive,this paper studies the changes of crude oil and rock properties during the drive process,and investigate the change rule of reservoir basic parameters such as pore radius,permeability and porosity of rocks,as well as viscosity,density and crude oil components of crude oil.The investigation results show that with the increase of CO2 injection,the pore radius and permeability of the rock increase,remain unchanged or decrease,and the lipophilicity increases.With the increase of temperature as well as action pressure,the density of crude oil decreases.At a certain temperature,with the increase of action pressure,the viscosity of crude oil will first decrease,then increase and finally stabilize,and the content of C30+ will decrease.At a certain action pressure,with the increase of temperature,the viscosity of crude oil will decrease and the content of C30+ will decrease unconspicuous.
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