This document discusses different types of production decline curves used in decline curve analysis (DCA) for oil and gas wells. It describes exponential, hyperbolic, and harmonic decline curves. Exponential decline has a constant decline rate over time and appears as a straight line on a semi-log plot of production rate versus time. Hyperbolic decline has a declining rate over time determined by a hyperbolic exponent b. Harmonic decline assumes a constant decline rate divided by cumulative production. DCA is used to forecast future production and estimate reserves based on fitting historical production data to these standard decline curves.
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