> For the complete documentation index, see [llms.txt](https://oliasoft.gitbook.io/oliasoft-welldesigntm-public-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://oliasoft.gitbook.io/oliasoft-welldesigntm-public-docs/user-guides-1/reservoir/reservoir-models-ipr-models.md).

# 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

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-McnjHpY5rIx9iTMYzuU%2Fimage%20\(3\).png?alt=media\&token=bf9422b5-f12a-4f50-af85-8e58004016c6)

#### **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

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-McnjS0xRSHdOktLmVzg%2Fimage%20\(4\).png?alt=media\&token=0e99269f-2c41-49c4-9706-91559a100942)

#### **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.

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-Mcnjal4Mp-HI6H_IXiL%2Fimage%20\(5\).png?alt=media\&token=9ecd4311-e24f-4fb6-b0f9-c990e3c1023f)

### **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.

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-McnjlvuQxgEVWI36xgl%2Fimage%20\(6\).png?alt=media\&token=16ec2c61-74a4-4f9d-a915-e1dee28b17c4)

#### **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.

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-McnjuL9r865v_N4dZiy%2Fimage%20\(7\).png?alt=media\&token=c12da741-2012-49d6-b7d7-06a7d34f8098)

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

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

{% hint style="info" %}
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.
{% endhint %}

![](https://1901482827-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LgbgDihqdYuxtPooIin%2F-McnTNvYuY2JslE53_hA%2F-Mcnk3iBGAr9S6ZgOTMx%2Fimage%20\(8\).png?alt=media\&token=d53dd18b-de54-4b2c-b834-6f01b9c77987)