Abstract
This chapter introduces an efficient semianalytical model for simulating shale gas and tight oil production by considering complex fracture geometries. The semianalytical model divides complex fractures into a number of small fracture segments to describe the complex fracture geometry. A new diffusivity equation for shale gas simulation is derived by considering the important gas transport mechanisms such as gas slippage, gas diffusion, and gas desorption. In addition, the pressure-dependent fracture conductivity effect is considered. The verification of the semianalytical model against an analytical solution and a numerical reservoir simulator for rectangular fractures and planar fracture with varying width in shale gas and tight oil reservoirs is presented. The impacts of various gas transport mechanisms and complex fracture geometries on well performance and transient flow regimes in shale gas and tight oil reservoirs are discussed.
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