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          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2015 Vol.6

    Numerical Simulation Study on Influence of Crude Oil Degassing Degree on Miscible Phase Pressure
    Author of the article:Lai Wenjun, Guo Ping
    Author's Workplace：State Key Lab of Oil & Gas Geology and Exploration Engineering, Southwest Petroleum University
    Key Words：Slim-tube test; Numerical simulation; Oil degassing; Miscible pressure
    Abstract：In the gas injection flooding, the minimum miscible pressure (MMP) is one of important parameters for determining oil and injected gas so as to realize miscible phase. Tubule experimental method is usually adopted to determine the MMP, but adoption of this method needs high cost and long time and this method must be conducted under the pressure condition higher than saturation pressure. If displacement pressure is less than the saturation pressure, crude oil degassing shall be considered, it is more complicated. So far, no corresponding tubule experiment has been conducted, thus how to obtain the accurate MMP becomes the key factor. Fitted are the PVT properties of formation fluid, established is a one-dimensional numerical simulation model for simulating tubule experiment so as to determine the minimum miscible pressure and finally conducted is simulating prediction on MMP of injected crude oil and gas under different degrees of degassing. The results show that: based on accurate fluid PVT parameters, reliable minimum miscible pressure can be obtained from the tube experimental model established by using numerical simulation method, oil recovery remains about the same along with displacement pressure increase if the pressure is higher than the minimum miscible pressure and oil degassing degree has a certain influence on the MMP, the more severe oil degassing, the lower the minimum miscible pressure. The study results can provide some certain theoretical guidance for gas injection miscible flooding.

     


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