Since production curtailment for other than engineering reasons is progressively vanishing, and more and more wells are currently producing at capacity and showing declining production rates, it was viewed as auspicious to display a brief audit of the advancement of decrease bend investigation amid the previous three or four decades. A few of the plebeian sorts of decline curves were talked about in detail and the mathematical relationships between cumulative production, time, and production rate and decline percentage for each case were contemplated.

This work summarizes the different production analysis methods published in the literature and evaluate the most applicable methods for use in determining well and reservoir parameters, and estimating the gas in place for tight gas reservoirs. Field and simulated examples are presented to illustrate the evaluation of these methods. Results from this study show that modern methods such as Blasingame, Agarwal and Gardner, Normalized Pressure Integral and the Flowing Material Balance are valuable tools for production history and pressure data to determine reservoir parameters and reserve for tight gas reservoirs.

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