d_Semilog Analysis for Oil Wells

# d_Semilog Analysis for Oil Wells - SemilogAnalysis...

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1 Semilog Analysis For Oil Wells

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2 Outline 1. Drawdown 2. Buildup
3 Reservoir Pressure Profile 500 1000 1500 2000 1 10 100 1000 10000 Distance from center of wellbore, ft Pressure, psi s = +5 s = -2 s = 0

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4 Log Approximation to the  Solution to the Diffusivity Equation  for a Well with Skin ( 29 + - φ μ + μ - = s 869 . 0 23 . 3 r c k log t log kh qB 6 . 162 p p 2 w t 10 10 i wf b mx y + =
5 Estimating Permeability and Skin + φ μ - - = 23 . 3 r c k log m p p 151 . 1 s 2 w t 10 hr 1 i mh qB . k μ - = 6 162

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6 Drawdown Test Graph 700 800 900 1000 1100 1200 0.1 1 10 100 1000 Elapsed Test Time, hrs Pressure, psi (t 2 , p wf2 ) (t 1 , p wf1 )
7 Exercise 1 Determining permeability and skin factor  from a constant-rate flow test

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8 Exercise 1 3300 3350 3400 3450 3500 3550 3600 1 10 100 Time, hrs Pressure, psi
9 Problems with Drawdown Tests It is difficult to produce a well at a strictly constant  rate

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d_Semilog Analysis for Oil Wells - SemilogAnalysis...

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