水蒸気圧入による油回収実験
1977 年 42 巻 4 号 p. 246-250
詳細
1977 年 42 巻 4 号 p. 246-250
In this paper, a discussion is presented on the steam-flood performance, the residual oil saturation and the change of recovery owing to oil viscosity differences by steam injection in a reservoir model.
The reservoir model was made of steel pipe 2 inches in diameter and 1m in length packed with silica sand and filled with oil.
In the experiment, the flow performance of oil displacement was shown in three stages. The first one was distilled oil bank which was the end of the oil. The second one was a water bank following the oil which showed a constant flow rate and its water-oil ratio was about 3 to 4. Behind the water bank, the steam front just came in contact with it at the third stage. The flow rate suddenly increased just before steam broke through. The water-oil ratio after the break-through was about 20 to 40.
The residual oil saturation was about 10% in the water bank just ahead of the steam front and gradually increased to 50% toward the distilled oil bank. Behind the steam front, the residual oil saturation was constant.
The oil recovery was increased from 80 to 90%, depending on the decrease of viscosity.
