CO

2

injection is a commonly used technique for recovering oil from mature reservoirs as it can not only greatly improve oil recovery

but also achieve the goal of greenhouse gas emission reduction. Most of the reservoirs in China are continental deposits

and the serious heterogeneity leads to serious CO

2

gas channeling

which makes the effect of CO

2

flooding worse. In this paper

the simulation experiment of continuous gas injection

WAG

intermittent gas injection and pulse injection of CO

2

is carried o

ut by using the heterogeneous model in the layer

and the effects of the characteristics of the CO

2

flooding in the heterogeneous oil reservoir and the dynamic environment on the CO

2

gas blow-by are studied. The experimental results show that WAG injection flooding is the best

the effect of intermittent gas injection and continuous gas injection is second

and the pulse gas injection effect is the worst; CO

2

flooding has no gas and low gas oil. In the production stage

extending the production time of the two stages can improve the development effect; by changing the hydrodynamic conditions

the CO

2

gas channeling can be effectively suppressed

and the WAG injection is more capable of suppressing the gas channeling

and the disturbance effect of the pulse gas injection is intensified. The above experimental results show that WAG injection in heterogeneous reservoirs is the optimal injection mode for CO

2

flooding.