Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 153-161.doi: 10.12108/yxyqc.20210316

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Characteristics of solid deposition and reservoir damage of CO2 flooding in tight sandstone reservoirs

GUO Yongwei1,2, YAN Fangping1, WANG Jing1, CHU Huili1, YANG Jianlei1, CHEN Yingchao1, ZHANG Xiaoyang1   

  1. 1. Chengde Petroleum College, Chengde 066700, Hebei, China;
    2. Chengde Field Artificial Intelligence Engineering Technology Research Center, Chengde 066700, Hebei, China
  • Received:2020-10-13 Revised:2020-12-24 Online:2021-06-01 Published:2021-06-03

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Abstract: The damage of asphaltene and metal inorganic precipitation to tight reservoir is an inevitable problem in CO 2 flooding. In order to explore the damage mechanism of asphaltene and inorganic precipitation to reservoir，taking Chang 7 reservoir of Yanchang Formation in Ordos Basin as an example，on the basis of clarifying the relationship between CO2 content and asphaltene precipitation in crude oil under（non）miscible pressure，the damage characteristics of asphaltene and inorganic precipitation on reservoir during CO2 immiscible and miscible flooding were studied by long core experiment，and the damage degree of organic and inorganic precipitation on reservoir permeability and porosity was evaluated. The results show that when the CO2 content in crude oil reaches the critical value，asphaltene begins to precipitate，and the precipitation increases rapidly at first and then tends to be stable with the increase of CO 2 content. The damage degree of asphaltene precipitation to permeability and porosity under miscible pressure is greater than that under immiscible pressure. Under miscible pressure，a large number of asphaltenes are deposited in the back of long cores，while under non miscible pressure，they are mainly in the front and middle of long cores. When the asphaltene precipitation in the core reaches the maximum，the subsequent asphaltene precipitation in the core will gradually decrease，and the damage to permeability will also gradually reduce. The damage degree of inorganic precipitation to the permeability of the front and middle cores is greater under immiscible pressure，while the damage degree of inorganic precipitation to the permeability of the middle and rear cores is greater under miscible pressure. The effect of inorganic precipitation on porosity is different from that on permeability， which is closely related to dissolution and the location of inorganic precipitation. If the target reservoir is developed by immiscible flooding，the prevention focus is on inorganic precipitation， and the prevention position is near the injection end；if miscible flooding is used，the prevention focus is on organic precipitation， and the prevention position is near the production end.

Key words: tight sandstone, CO2 flooding, asphaltene deposition, inorganic precipitation, injection pressure

CLC Number: 

  • TE31
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