A Laboratory Study on the Micro Mechanism of Oil Displacement with CO2 Flooding

doi:10.11885/j.issn.1674-5086.2015.03.09.03

Abstract

Abstract:

Through one-dimensional physical simulation experiment with the cores of ultra low permeability reservoir in the
peripheral part of Daqing，this paper studies the micro mechanism of oil displacement mechanism by water flooding、CO2
flooding and CO2 flooding after water injection，furthermore，the suggestion for the field application of gas flooding after
water injection is put forward. The main advantage of this experiment is reducing oil viscosity and extraction of CO2，etc.
Compared with water flooding，CO2 flooding oil displacement is more efficient with notable oil increment. Result shows that：
for low permeability reservoir，the effect of water flooding is the worst，about 40%，at different time of water injection gas
driving can lead to better effect，the earlier timing of water injection the better effect，to have better economic benefits the rate
of water content should be 10%～20%；flooding recovery degree is best by gas injection，can reach to about 67%. By means of
NMR，we can compare the different development ways，CO2 displacement and water displacement extracts most of movable
fluid in macro pores，however，the CO2 can increase the sweep volume effectively after water injection，which also make the
parts of the small pore crude oil become movable.

Key words: CO2 flooding, the micro mechanism of oil displacement, moveable fluids, low permeability reservoir, nuclear
magnetic resonance

Xiao Pufu1*, Yang Zhengming2, Wang Xuewu2, Dai Xingxing3. A Laboratory Study on the Micro Mechanism of Oil Displacement with CO2 Flooding[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.09.03.

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