Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 122-128.doi: 10.12108/yxyqc.20200213

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Influence of vertical heterogeneity of reservoirs on in-situ CO2 profile control and flooding effects

ZHENG Yufei1, LI Xiang1, XU Jingliang1, ZHENG Weijie2, YU Meng1   

  1. 1. China Oilfield Services Limited, Tianjin 300459, China;
    2. College of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266555, Shandong, China
  • Received:2019-07-22 Revised:2019-10-08 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to study the influence of vertical heterogeneity of offshore oil reservoirs on in-situ CO2 profile control and flooding effect,12 groups of inter-layer heterogeneity models and 3 groups of in-layer heterogeneity models were established respectively. The adaptability of in-situ CO2 profile control and flooding to in-layer heterogeneity,interlayer heterogeneity and permeability ratio was investigated by displacement experiments. The results show that under the condition of the same permeability of each layer,the recovery improvement range of insitu CO2 profile control and flooding on the in-layer heterogeneity models can reach 27.40%-31.03%,while that on the inter-layer heterogeneity models was only 17.38%-22.05%,indicating that the CO2 profile control and flooding technology was mainly affected by inter-layer heterogeneity. For inter-layer heterogeneity models with same medium and low permeability layer,the higher the permeability ratio,the better the enhanced oil recovery effect of in-situ CO2 profile control and flooding. Permeability mean value were used to characterize the effect of inter-layer heterogeneity. Enhanced oil recovery of in-situ CO2 profile control and flooding showed a trend of increasing and decreasing with the increase of permeability mean value. Field tests showed that in-situ CO2 profile control and flooding technology had good oil-increasing effect in offshore oilfields and had broad application prospects.

Key words: in-situ CO2, vertical heterogeneity, profile control and flooding, permeability mean value, offshore oilfield

CLC Number: 

  • TE357.46
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