Abstract—The existence of low permeability, strong heterogeneity, developing fracture, small pore throat and high capillary forces by specific surface leads to the low water flooding recovery and high injection pressure in developing a low permeability oilfield. As the advantage of injectivity, the gas flooding is introduced. However, gas flooding is easy to cause fluid breakthrough flow. Considering the influence of gas channeling to recovery, the intermittent gas injection is accepted. Based on the theoretical analysis and study of core displacement experiments, the efficacy of intermittent gas injection to enhance oil recovery in low permeability oilfield is evaluated. Also, the influence to recovery caused by intermittent period length and times is analyzed. The results show that the intermittent gas injection can restrain the gas channeling and improve the recovery of low permeability reservoirs effectively. The improved recovery point in each intermittent period has a positive correlation with intermittent period length. And the highest improved recovery point appears at the second or the third intermittent period generally.

Index Terms—low permeability, intermittent gas injection, recovery, experiment research

Cite: Lifei Dong , Xiang'an Yue, Qun Su, Wei Wang, and Hui Yang, "Experiment Research on Enhanced Oil Recovery by Intermittent Gas Injection in Low Permeability Oilfield," Journal of Industrial and Intelligent Information, Vol. 2, No. 4, pp. 280-283, December 2014. doi: 10.12720/jiii.2.4.280-283