Integral Type Curves for Advanced Decline Curve Analysis
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This paper introduces a new family of type curves for advanced decline curve analysis. The new type curves are obtained by combining the dimensionless production rate and the dimensionless cumulative production on a single log-log scale. The new type curve offers two significant advantages: 1) observed cumulative production data is much smoother than observed production rate data, making a match easier to obtain with the new type curve; and 2) simultaneously matching both rate and cumulative production provides more confidence in the selection of the correct early- and late-time stems. Plotting functions are presented to allow the new curves to be used for both oil and gas wells produced at either constant or varying flowing bottomhole pressure. Use of the new type curves is demonstrated for both simulated and field data.
