# TAMU PETE 662 - Ch 3 (14 pages)

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## Ch 3

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- Pages:
- 14
- School:
- Texas A&M University
- Course:
- Pete 662 - Production Engineering

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PETE 662 Production Engineering Chapter 3 Production from Two Phase Reservoirs Single Phase or Two Phase Flow Properties of Saturated Oil Oil Formation Volume Factor Bo Above the bubble point pressure pb Bo decreases with increasing system pressure effect of compressibility Below the bubble point pressure pb Bo decreases with decreasing system pressure less gas content at lower pressure Properties of Saturated Oil Gas Formation Volume Factor Bg Bg decreases with increasing system pressure effect of compressibility Properties of Saturated Oil Solution Gas Oil Ratio Rs Above the bubble point pressure pb Rs remains constant Below the bubble point pressure Rs increases with increasing system pressure high gas dissolution at higher pressure Properties of Saturated Oil Total Formation Volume Factor Bt Bt Bo Rsb Rs B g 3 1 Properties of Saturated Oil Property Correlations for Two Phase System Should only be used for lack of laboratory measured PVT data for the specific reservoir Reading Assignment Chapter 3 2 Two Phase Flow in a Reservoir Use effective permeability for inflow calculations k ro ko k k rw w k k Oil Gas Relative Permeability Curves k rg kg k 3 48 Oil Water Relative Permeability Curves Oil Inflow Performance for a Two Phase Reservoir Vogel Correlation It allows the use of oil properties only for a two phase system It uses the average pressures between p p wf to calculate the viscosity and formation volume factor qo qo max 2 p wf 3 53 1 0 2 0 8 p p p wf where for pseudo steady state ko h p 1 qo max 3 54 1 8 141 2 Bo o ln 0 472re rw s Substituting Eq 3 54 into Eq 3 53 yields qo k o h p 1 0 2 p wf p 0 8 p wf p 2 3 55 254 2 Bo p o p ln 0 472re rw s Oil Inflow Performance for a Two Phase Reservoir Example 3 5 Calculate Inflow Performance Using Vogel s Correlation Develop an IPR curve for the well described in Appendix B The drainage radius re is 1 490 ft and the skin effect is zero Solution Substituting values from Appendix B into Eq 3 55 for pi 4 336 psi yields 2 p wf p wf 3 56 0 8 qo 5067 1 0 2 p p Next plot pwf vs qo For Pseudosteady State p t p t t1 p t t 2 qo max Oil Inflow Performance for a Two Phase Reservoir Generalize Vogel Inflow Performance It applies to where the reservoir pressure is above bubble point and the bottomhole flowing pressure is below the bubble point Flow rate qb when pwf pb qb kh pe p wf 141 2 B p D s 3 57 where pD ln re rw for steady state or ln 0 472 re rw Productivity index above bubble point J qb 3 58 pi p b Define Vogel flow qV pb J 3 59 1 8 Oil Inflow Performance for a Two Phase Reservoir Generalize Vogel Inflow Performance cont d For pwf pb qo J pi p wf 3 60 For pwf pb 2 p wf p wf 3 61 qo qb qV 1 0 2 0 8 p p b b Note if p pb use the original Vogel correlation Eq 3 55 Oil Inflow Performance for a Two Phase Reservoir Fetkovich s Approximation It was developed to improve the accuracy of Vogel s predictions It requires a test at two stabilized flow rates to determine the two unknowns qo max and n Define qo max C p 2 2n qo C p p 2 wf 3 62 n n qo qo max p wf 2 3 63 1 p

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