An understanding of flow along horizontal wells can be important for reservoir management, specially: Tight and shale reservoir. As the completed length in such wells is considerably larger than that in conventional vertical wells, the flow field inside the wellbore can have a significant impact on the overall production characteristics of an oil reservoir. Flow in a well-bore is different from conventional pipe flow due to the presence of wall inflow (as in production wells) or outflow (as in injection wells), and this affects the wall friction, acceleration, and flow patterns inside the pipe. To better understand wellbore flow, Computational Fluid Dynamics (CFD) simulation has been used. A significant advantage of such simulation, besides the fact that they could potentially replace actual experiments, is that they offer a large amount of information on the turbulent velocity and pressure fields, the K-epsilon turbulent model was used to identify the entrance lenth and serve petroleum engineers to locate Pwf inside the horizontal drain for IPR calculation. One of the applications of such information is the development of new techniques in the perforation technology and fracturation of shale and tight reservoir, based upon FLUENT

(a commercial CFD software) simulations.

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