Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 113-119.doi: 10.12108/yxyqc.20190313

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence of pore throat structure on reservoir damage with CO2 flooding

TANG Meirong1,2, ZHANG Tongwu1,2, BAI Xiaohu1,2, WANG Xuanyi1,2, LI Chuan1,2   

  1. 1. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China
  • Received:2018-12-21 Revised:2019-03-10 Online:2019-05-21 Published:2019-05-06

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Abstract: In the process of enhancing oil recovery by CO2 flooding, the interaction of CO2 with crude oil and matrix minerals will damage the pore throat structure of reservoir. In order to reveal the influence of pore throat structure on reservoir damage during CO2 flooding, nuclear magnetic resonance (NMR) combined with high pressure mercury injection and scanning electron microscopy was used to determine the plugging degree of pore throat in core samples through laboratory physical simulation experiments, and the damage degree of core samples with different pore throat structures during CO2 flooding was evaluated, to clarify the reservoir damage mechanism. The experimental results show that asphaltene deposition and acidification produced during CO2 flooding have little effect on reservoir porosity, and the porosity of core samples decreased by about 1%. While the damage to permeability is greater, and the permeability of core with type Ⅲ pore structure decreased by 20.55%. The lower the permeability and the worse the pore throat structure, the greater the damage to permeability. The plugging degree of pore throat is positively correlated with pore throat structure parameters. The worse the pore throat structure is, the lower the median radius is, the easier the pore throat plugging will occur. The rate of pore throat plugging in type I pore structure cores is low, and the degree of pore throat plugging in type Ⅲ pore structure cores is obviously increased, up to 34.32%. The results can provide a basis for efficient application of CO2 flooding in the field.

Key words: nuclear magnetic resonance, pore throat structure, CO2 flooding, reservoir damage, influencing mechanism

CLC Number: 

  • TE357.7
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