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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position :Home->Past Journals Catalog->2023 Vol.3

    Gas drive characteristic curve in gas channeling pattern recognition
    Author of the article:YUE Baolin, MENG Zhiqiang, ZHAO Xinggang, GENG Songhe, ZHAO Jiannan
    Author's Workplace:CNOOC China Ltd., Tianjin Branch, Tianjin, 300459, China
    Key Words: Gas drive characteristic curve; Gas channeling mode; Production dynamics; Gas control technology
    Abstract:

    The water drive characteristic curve method to analyze production performance is widely used in the development practice of water drive oil fields, but there is a lack of similar research methods for Bohai gas drive reservoirs. Based on the theory of stable seepage flow, the gas drive characteristic curve formula is derived. The formula shows that after reaching the stable gas flooding stage, the cumulative gas cap production and the cumulative oil production can be considered to be in a straight line relationship on a semi-logarithmic coordinate. The actual gas drive curve is affected by the early gasless production stage and the later gas-carrying stage, and it is inverse S-shaped. The JZ-X oilfield is divided into three gas channeling modes based on the gas drive characteristic curve: fast gas channeling type, stable gas drive type, and high gas-oil ratio type. Fast gas channeling oil wells have a rapid decline in production, low cumulative oil production, and no stable production stage; stable gas drive oil wells have a gentle rise in gas-oil ratio, sustained stable production, and high cumulative oil production; development effects of high gas-oil ratios are between fast gas channeling type and the stable gas flooding type. Due to gas breakthrough in gas cap and crude oil degassing in the later stages of development, oil wells gradually produce gas mainly, carrying only a small amount of crude oil. The nature of the well transits from oil well to gas well. On the basis of clarifying the gas channeling pattern, combined with the application of gas control technology, the development strategy of dividing gas channeling mode and development stage is proposed. For rapid gas channeling type, well position is optimized and original wellbore is sidetracked, and the development effect is improved; for stable gas drive type, rational oil production speed shall be controlled at the initial stage, following the gas-oil ratio increase in the middle and late stages to support gas control measures. The gas-oil ratio shows a fluctuating upward pattern; for high gas-oil ratio type, the oil well is only affected by the high gas-oil ratio, carrying a small amount of crude oil. The nature of the well transits from oil well to gas well. Barrier water injection method is implemented to solve the problem of gas channeling. The research results provide guidance for the production and development of Bohai gas drive reservoirs and can realize the dynamic tracking and development adjustment of oil fields of the same nature.

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