World energy demand is so increasing and driving the oil and gas industry to produce more efficiently. Horizontal wells are expected to fulfill the energy needs through its advantages over conventional vertical wells. In this paper Joshi model and Furui et al. model for horizontal well productivity are analyzed by calculating with variables such as horizontal drainage area and vertical permeability. Vertical to horizontal permeability anisotropy is the primary important factor for the productivity of a horizontal well to reveal interesting results. Hence, the effect of changing vertical permeability and drainage area on inflow performance is primarily take into account in this paper.

Keywords : Horizontal Drainage Area, Vertical Permeability.