Skip to main content

Reservoir Models (IPR Models)


The different reservoir models to choose from are as follows:

Oil/Gas#

OilBasic#


  • The most basic reservoir model and can be used if the productivity indices are not available.

  • Reservoir properties: Insert the Horizontal permeability (kH), kV/kH ratio and Skin.

    • If kV/kH ratio is not given, set it to 1.



OilFractured#


  • An extension of the OilBasic model and can be used for the case of a fractured reservoir

  • Reservoir Properties: Insert the Horizontal permeability (kH), kV/kH ratio and Skin

    • If kV/kH ratio is not given, set it to 1

    • Porosity, oil saturation and gas saturation is defined by percentage. The saturation percentages must sum to 100%, as these are used as weighted factors for the compressibilities computed from PVT

  • When choosing the OilFractured reservoir model, a Beta factor type selection and advanced parameters become available. The Beta factor can be set to either Norway or International, depending on the well location. The advanced parameters are:

    • Solution Type: DefaultWell, InfiniteConductivityFracture, UniformFluxFracture

    • Boundary Type: AllSidesNoFlow, LeftSideConstantPressure, TopSideConstantPressure, LeftAndRightSideConstantPressure, TopAndBottomSideConstantPressure, TopAndBottomSideConstantPressure

    • Flow Conditions: Automatic, PseudoSteadyState, Transient




OilExplicit#


  • The simplest inflow model where the productivity index for the predefined penetration scenarios are set directly as probability distributions.

  • Inflow productivity index, when penetrating 100%, 50% or 5m of the reservoir, has to be defined.




Gas Condensate#

GasDeliverability#


  • Contains the same inputs at the OilFractured model and can be used for fractured gas reservoirs.

  • Reservoir properties: Insert the Test (effective) permeability (kH), kV/kH ratio and skin.

    • If kV/kH ratio is not given, set it to 1.

    • The porosity is defined by percentage.

  • When choosing the GasDeliverability reservoir model, a Beta factor type selection and advanced parameters becomes available.

    • The Beta factor can be set to either Norway or International, depending on the well location.

    • The advanced parameters are Solution type, Boundary type and Flow conditions.




GasExplicit#

  • The simplest inflow model, where the productivity index for the predefined penetration scenarios, are set directly as probability distributions.

  • Inflow productivity index, when penetrating 100%, 50% or 5m of the reservoir, has to be defined.




UserDefined - Available for Both Oil/Gas and Gas/Condensate Reservoirs#

  • Allows the user to input an IPR curve generated in an external software.

NOTE!
The first row must include the pressure at flow rate = 0 m3/d while the last row must include flow rate at pressure = 0 bar.