Steam flooding and chemical assisted steam flooding are important EOR methods for heavy oil reservoirs.In order to compare the two methods

we performed simulated steam flooding experiments on samples from Tahe heavy oil reservoirs in Xinjiang

China

to assess their EOR effects under different steam injection parameters.The results show that

during steam flooding

the oil recovery is positively correlated to injection temperature but insensitive to injection pressure

and that adding some additives

such as n-pentane

n-hexane

and n-heptane

can greatly improve the recovery.It is also noteworthy that the recovery factor of heavy oil tends to lower along with increasing injection pressure during steam flooding

while it increases to some extent along with increasing injection pressure during chemical assisted steam flooding.