Microscopic Characteristics of Oil Displacement With Different CO2 Injection Modes in Extra-Low Permeability Reservoirs

doi:10.7657/XJPG20200211

Abstract

Abstract:

In order to investigate the microscopic characteristics of oil displacement and the lower limit of the pore diameter of CO₂ injection with different injection modes in extra-low permeability reservoirs, NMR technology is used to analyze the microscopic residual oil distributions in cores for different injection modes such as continuous CO₂ flooding, CO₂ flooding after waterflooding and alternative water-gas flooding. The experiment results show that relatively good oil displacement effects of CO₂ flooding after waterflooding and alternative water-gas flooding have been gained. Continuous CO₂ flooding can displace oil in smaller pores, CO₂ flooding after waterflooding can displace oil in small pores and micropores（pore size less than 0.5 μm）which can’t be recovered by water flooding, and good effects of alternative water-gas flooding can be gained in medium pores (0.5-5.0 μm). For the cores with different pore structures, the stronger the heterogeneity of the reservoir is and the more the small pores account for, the higher the lower limit of pore diameter in different injection modes will be. As a whole, good oil displacement effects can be gained by applying alternative water-gas flooding in Chang-8 reservoir of Huang-3 block in Changqing oilfield.

Key words: Changqing oilfield, Huang-3 block, Yanchang formation, extra-low permeability reservoir, CO₂, injection method, microscopic oil displacement characteristic, lower limit of pore size

CLC Number:

TE357.45

QIAN Kun, YANG Shenglai, DOU Hong’en, ZHANG Jichang. Microscopic Characteristics of Oil Displacement With Different CO₂ Injection Modes in Extra-Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(2): 204-208.

Figures/Tables 7

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References 20

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Microscopic Characteristics of Oil Displacement With Different CO₂ Injection Modes in Extra-Low Permeability Reservoirs

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