Sometimes decline curves for tight gas wells indicate that linear flow may last for over 10 or 20 years. These decline curves may show outer boundary effects but no pseudo-radial flow. This paper presents decline curve analysis methods for such wells. Values for k xf and drainage area can be calculated. Stabilized (bounded) flow equations are also presented for forecasting. The solutions and type curves developed are for both infinite-acting and stabilized flow with either constant Pwf or constant rate. Several field cases are shown with example calculations.
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