Abstract
This chapter deals with analysis of decline curves during the transient and pseudo-steady-state flow periods. It discusses the classifications of production decline curves and their practical uses are with field examples including methods to forecast performance of horizontal and vertical fracture gas reservoirs. The chapter also explains the use of the general infinite-acting solution and reservoir properties, to calculate wellbore conditions during the transient production period of a gas well. Based on this understanding, the development and the pertinent relationship for three types of production decline curves on coordinate, semilog and, log–log graph paper are derived. Decline curve analysis is a useful tool for reserves estimation and production forecasts, and also serve as diagnostic tools and indicates the need for stimulation or remedial work. Production decline curves are of three types—exponential decline, hyperbolic decline, and harmonic decline.
Published Version
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