Experimental Study of Improved Oil Recovery Through Air Foam
Flooding in Ultra-low Permeability Reservoir

doi:10. 3863/j. issn. 1674 – 5086. 2013. 05. 018

Abstract

Abstract:

Wuliwan-1 block is a main reservoir in Changqing oilfield. It is an ultra-low permeability lithologic reservoir with
bad pore configuration. The block is a heterogeneous reservoir with low oil recovery. With the purpose of further improvement
of oil recovery，the experiments of small batch reactor，Accelerating rate calorimeter and single or double flooding were
launched. The low temperature oxidation ability of oil and air foam EOR regular pattern of ultra-low permeability reservoir was
researched. The results show that the low temperature oxidation can happen in the reservoir condition，and the oxidation rate
will increase fast when the temperature reaches 100 ℃，the activation energy of oil E=6135 4 J/mol. The injection of air foam
after waterflooding will improve oil recovery obviously in ultra-low permeability reservoir，with the improvement amplitude
reaching to 20%. The higher of the reservoir permeability，the larger of the oil recovery of air foam flooding. The injection
time of air foam has a significant impact on the oil recovery. It is more benefit to inject air foam in the production tail，in order
to enhance the oil recovery.

Key words: ultra-low permeability reservoir, air foam, low temperature oxidation, enhanced oil recovery

Wang Jiexiang, Wang Tengfei, Han Lei, Ren Wenlong. Experimental Study of Improved Oil Recovery Through Air Foam
Flooding in Ultra-low Permeability Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 05. 018.

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