0018 Ipm Pro Pu Vlp Generation
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Frequently Asked Questions 1 © Petroleum Experts Ltd. Question: What values should be used for generating the VLP curves? Keywords: IPM - PROSPER - GAP - VLP Answer: The values used for generating the VLP curves are dependent upon the conditions of the field. The objective is to generate the VLP curves with a range of values that encompass the conditions which will be experienced in the field in future. The reason for using a high range of values is so that GAP will always interpolate between the values entered. If the range of data points entered is sparse, then GAP will have to extrapolate on the values which will give incorrect results. The following values can be used as possible intervals to enter the data for the VLP curves. These values are only provided as guidance. The user has the best understanding of the production system, and is therefore in the best position to decide on the range of values to be used. It is the responsibility of the User to cross check if the field conditions observed for a particular well lie within the range of data entered for the VLP curves. • For Naturally Lifted Oil Wells. From To Number of Points Distribution of Points Comments Liquid Rate From low value (say 100 stb) AOF (Absolute Open Hole Flow of well) 20 Geometric Spacing Top Node Pressure 100 psig Reservoir Pressure 10 Linear Spacing The Top Node Pressure corresponds to the Well Head Pressure. Water Cut 0 % 90% or 95 % or 99 % 10 Linear Spacing GOR A value less than Solution GOR 25000 scf/stb 10 Geometric Spacing The second value of the GOR is generally set to the Solution GOR. The value less than Solution GOR corresponds to the reduction in GOR when Reservoir Pressure just falls below the bubble point.
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Transcript of 0018 Ipm Pro Pu Vlp Generation
Frequently Asked Questions 1
© Petroleum Experts Ltd.
Question:What values should be used for generating the VLP curves?
Keywords:IPM - PROSPER - GAP - VLP
Answer:The values used for generating the VLP curves are dependent upon the conditions of the field. Theobjective is to generate the VLP curves with a range of values that encompass the conditions whichwill be experienced in the field in future.
The reason for using a high range of values is so that GAP will always interpolate between the valuesentered. If the range of data points entered is sparse, then GAP will have to extrapolate on the valueswhich will give incorrect results.
The following values can be used as possible intervals to enter the data for the VLP curves. Thesevalues are only provided as guidance. The user has the best understanding of the production system, and is therefore in the bestposition to decide on the range of values to be used. It is the responsibility of the User tocross check if the field conditions observed for a particular well lie within the range of dataentered for the VLP curves.
· For Naturally Lifted Oil Wells.
From To NumberofPoints
Distributionof Points
Comments
Liquid Rate From lowvalue (say100 stb)
AOF (AbsoluteOpen Hole Flow ofwell)
20 GeometricSpacing
Top NodePressure
100 psig ReservoirPressure
10 LinearSpacing
The Top Node Pressurecorresponds to the Well HeadPressure.
Water Cut 0 % 90% or 95 % or 99 %
10 LinearSpacing
GOR A value lessthan SolutionGOR
25000 scf/stb 10 GeometricSpacing
The second value of the GORis generally set to the SolutionGOR. The value less thanSolution GOR corresponds tothe reduction in GOR whenReservoir Pressure just fallsbelow the bubble point.
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· For Gas Wells
From To Numberof Points
Distributionof Points
Comments
Gas Rate From lowvalue (say 0.1MMscf)
AOF (AbsoluteOpen Hole Flow ofwell)
20 GeometricSpacing
Top NodePressure
100 psig Reservoir Pressure 10 LinearSpacing
The Top Node Pressurecorresponds to the Well HeadPressure.
WGR 0 Refer toComments on theRight
10 LinearSpacing
The value for Maximum WGRis dependent upon the fluidproperties. Generally a valueof 100 stb/MMscf isreasonable.
CGR 0 Refer toComments on theRight
10 GeometricSpacing
The value for Maximum CGRis dependent upon the fluidproperties.
· For Retrograde Condensate Wells
From To Numberof Points
Distributionof Points
Comments
Gas Rate From lowvalue (say 0.1MMscf)
AOF (AbsoluteOpen Hole Flow ofwell)
20 GeometricSpacing
Top NodePressure
100 psig Reservoir Pressure 10 LinearSpacing
The Top Node Pressurecorresponds to the Well HeadPressure.
WGR 0 Refer toComments on theRight
10 LinearSpacing
The value for Maximum WGRis dependent upon the fluidproperties. Generally a valueof 100 stb/MMscf isreasonable.
GOR 0 Refer toComments on theRight
10 GeometricSpacing
The value for Maximum GORis dependent upon the fluidproperties.
· For Artificially Lifted Wells
The VLP Data section for Artificially Lifted Wells requires inputting a fifth variable. The following tableshows the variables and values for different types of Artificially Lifted Wells.
Variable Values Comments
Frequently Asked Questions 3
© Petroleum Experts Ltd.
Gas LiftedWells
GLR Injected or 0, 100, 200, 400, 800, 1600,3200, 6400, 12500, 25000(in scf/stb)
Using the GLR Injected as a variable willensure that the VLP curves will alwaysinterpolate for the Gas Lift Gas Rate.
Gas Lift Gas Rate Enter the range of values that could beinjected in the well
ESP wells Frequency ofOperation
Depending on the Variable FrequencyDrive Option, enter the range of values forthe frequency of motor operation. Thesegenerally range from 40 to 70 Hz.
PCP Well Motor RPM The Motor rpm corresponds to the PumpSpeed.
Jet PumpWell
Power Fluid Rate
HSP Well Power Fluid Percent
· For GAS Injection Wells
From To NumberofPoints
Distributionof Points
Comments
Gas Rate From lowvalue (say 0.1MMscf)
AOF (AbsoluteOpen Hole Flow ofwell)
20 GeometricSpacing
Top NodePressure
100 psig ReservoirPressure
10 LinearSpacing
The Top Node Pressurecorresponds to the Well HeadPressure.
WGR 0 Refer Commentson Right
10 LinearSpacing
The Maximum Value for WGRis dependent upon the qualityof the gas being injected.Generally a value of 50stb/MMscf is reasonable.
CGR 0 Refer Commentson Right
10 GeometricSpacing
The Maximum Value of CGR isdependent upon the quality ofthe gas being injected.
· For WATER Injection Wells
From To Numberof Points
Distributionof Points
Comments
Liquid Rate 100 stb AOF (AbsoluteOpen Hole Flow ofwell)
20 GeometricSpacing
ManifoldPressure
100 psig Reservoir Pressure 10 LinearSpacing
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