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Petroleum Engineering PtrE 421 Production Engineering Lecture 2 Undersaturated Oil Reservoir Inflow Performance
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Petroleum Engineering Read chapter 2 in Textbook, Petroleum Production System , by Economides, M.J., A.D. Hill, and C.E. Ehlig-Economides Reading and Homework
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Petroleum Engineering Outline Darcy’s Law Transient Flow Steady-State Flow Pseudo-Steady-State Flow Productivity Index IPR Curve Horizontal Well Production Effects of Water Production
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Petroleum Engineering Darcy’s Law dL d k v gh p v = cm/s = Atm L = cm = cp k = Darcy
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Petroleum Engineering Reservoir Flow Types Transient Flow -pressure disturbance at wellbore has not yet reached reservoir boundary Steady-State Flow - pressure disturbance has reached all Boundaries, reservoir pressures are not changing -pressure support, i.e. one or more constant pressure boundaries Pseudo-Steady-State -pressure disturbance has reached all boundaries - closed reservoir, constant flow rate production - bottomhole pressure decreases with depletion
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Petroleum Engineering Transient Flow (TF) Infinite-acting reservoir Radial flow Slightly compressible and constant viscosity fluid
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Petroleum Engineering Constant-Rate Solution s r c k t kh qB p p w t i wf 87 . 0 23 . 3 log log 6 . 162 2  p = psi q = STB/day B = rb/STB = cp k = md s = -6 to 50 h = ft t = hour = fraction c t = psi -1 r w = ft
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Petroleum Engineering Approximate Constant-Pressure Solution 2 162.6 log log 3.23 0.87 i wf t w kh p p q k B t s c r 
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Petroleum Engineering Construct IPR of a well in an oil reservoir. Consider: 1) TF at 1 month, 2) SSF, and 3) PSSF. The following data are given: Porosity,    Effective permeability, k = 8.2 md
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