الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Among different reservoir forecasting methods, decline curve method stands as the simplest, least time consuming and least data requirement method. This is more proper for tight and unconventional reservoirs. Production from these unconventional reservoirs has grown dramatically around the world for past few years. Rate transient analysis received greater attention with the growth of production from tight and unconventional reservoirs due to the long term transient flow. Conventional decline curve methods are still applied in forecasting these unconventional resources plays due to the lack of new methods fit these plays. So, still one of the biggest challenges is to predict long-term performance of these plays. Various decline curve models have been proposed to model the time-rate behavior of early transient and transitional flow of massive fractured unconventional reservoirs, but most are limited in the ability to properly model all flow regimes. This study presents a new analytical equivalent model for DCA, the Variable Derivative of the Loss Ratio (VDLR) in which the 𝑏-exponent is defined as a time dependent parameter. The VDLR method depends on the 𝑏-exponent which is a characteristic term in literature for different cases of decline curves, this makes the new model more obvious and helps in estimation of the model parameters. The new method is simple and overcomes the shortage of some other methods. The VDLR model simply contracts to Arps hyperbolic equation for conventional reservoirs. This method is tested and verified using analytical solutions, numerical simulation cases, and actual field data. In addition, the model parameters are calibrated for different flow regimes in single and dual porosity reservoirs. The results confirm the effectiveness of this new method.