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.