TAMU PETE 662 - SPE100207_slides (25 pages)

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SPE100207_slides



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SPE100207_slides

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Pages:
25
School:
Texas A&M University
Course:
Pete 662 - Production Engineering
Production Engineering Documents

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SPE 100207 The Relative Importance of Wellbore Pressure Drop and Formation Damage in Horizontal Wells A D Hill and Ding Zhu Texas A M University Background Previous studies have identified particular conditions for which wellbore pressure drop effects are important In some cases pressure drop will restrict limit or even eliminate well flow rate at the surface No quantitative general guidelines have been developed to aid well performance prediction Background Difference between vertical and horizontal multilateral wells complex trajectory of wellbore Objectives Present simple analytical expressions to determine the relative effects of wellbore pressure drop and formation damage on horizontal well inflow Use the equations to show how horizontal wells or laterals can be designed so that neither of these effects causes significant flow restrictions Concept pe pwf Dpwell affects flow rate distribution along a horizontal lateral Dpwell depends on flow rate Non uniform flow distribution Higher drawdown at the heel possibly causes early coning Approach pe Pwf i Segment wellbore Calculate reservoir flow by an inflow equation Calculate wellbore flow by a wellbore pipe flow equation Update drawdown at each segment Inflow Equation for Steady State Flow Furui et al Model 141 2qBo 0 294hI ani yb Dpr ln s sR kL rw I ani 1 hI ani z y L rw h 2yb s formation damage skin sR partial penetration skin Iani anisotropy ratio Wellbore Pressure Drop Frictional pressure drop in horizontal pipe Dpw D L 2 f u 2 L gc D u f L D flow velocity friction factor length of pipe diameter of pipe Relative Importance of Pressure Drop Wellbore pressure drop is important only when it is large relative to the reservoir pressure drop drawdown Relative Importance of Wellbore Pressure Drop Dp f Dpr NH 4 f f N Re N H kL2w yb 4 0 294hI ani D ln s sR rw I ani 1 hI ani Dpr Dpw Relative Importance of Wellbore Pressure Drop Dp f Dpr 4 f f N Re N H kL2w NH 4 0 294hI ani yb D ln s sR rw I ani 1 hI ani 4q N Re D



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