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    Your Position ：Home->Past Journals Catalog->2011 Vol.5

    Analysis on Horizontal Well Productivity in Low Permeability Gas Reservoirs with Deformation Medium
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    Key Words：Horizontal well；Heterogeneity；Stress sensibility；Startup pressure gradient；Skin effect；Productivity prediction
    Abstract：A lot of laboratory researches have confirmed that startup pressure gradient and stress sensibility exist in low permeability reservoir. Based on the deformation medium in low permeability reservoir，considering nonuniformity，stress sensitivity，startup pressure gradient and skin effect，the conformal transformation method are used to derive output calculation model for horizontal well. The research results show that the effect of different factors on output of horizontal well in low permeability gas reservoir presents an approximate linear change relation，nonuniformity has the max effect and its high vertical permeability is beneficial for output increase of horizontal well. Calculation results obtained from examples show that relative error of productivity prediction calculated through the model is small.
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