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          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2014 Vol.6

    Effect of Different Injected Gases on High Pressure Physical Property of Crude Oil in Fractured Reservoir
    Author of the article:Guo Shasha, Mei Haiyan, Wang Huailong, Zhang Maolin
    Author's Workplace：1.College of Petroleum and Natural Gas Engineering, Southwest Petroleum University;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University
    Key Words：Fractured reservoir; CO2 injection; Associated gas injection; Crude oil high pressure physical properties
    Abstract：Fractured reservoir has rich oil reserves, but because of its severe heterogeneity, its effective development remains to be solved. Gas injection is one of effective ways to develop fractured reservoir. In order to understand crude oil property change after different gases are injected into fractured reservoir, analyzed are high-pressure physical properties of crude oil in fractured reservoir after injection with numerical simulation method. The results show that compared with saturation pressure increass faster with associated gas injection than CO2 injection, which means that when ratio increased, injected associated gas became more difficult to form miscible. CO2 has more significant effect on crude oil physical properties: interfacial tension disappears when gas injection proportion goes up to 77.9%, which means that it already formed miscible theoretically and CO2 injection’s oil displacement efficiency is better. Research results show that gas injection can decrease the fractured reservoir oil viscosity and interfacial tension and increase saturation pressure. But injection of different gases has different effects on high-pressure physical properties of crude oil.

     


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