Curve Extrapolator
Extrapolates the well curve to the top and base of the model.
![](https://media.screensteps.com/image_assets/assets/004/471/800/original/275a1534-f23c-4706-bdff-4ff0debf6a8b.png)
- In the Control Panel, go to View > New Single Well View.
- In the Single Well window, open the Process tab.
- At the tab header, click the blue "+" icon.
- Click on Curve Extrapolator (One Curve).
- Type a name for the process and click OK.
Configure the curve extrapolator
![](https://media.screensteps.com/image_assets/assets/003/706/730/original/a832c163-902f-4ae7-899a-13c0680f9372.png)
- Curve: Select a well curve.
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Missing / Invalid Values: Choose the action when input variables are unavailable, null or invalid prior to filtering. This rule is applied when calculating each sample:
- Interpolate: Interpolate missing values using the class interpolation setting.
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Output is Null:
- Output null (empty value) if the value of any curve is invalid.
- Output null (empty value) if the result is invalid.
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Output is 0:
- Output zero if the value of any curve is invalid.
- Output zero if the result is invalid.
![](https://media.screensteps.com/image_assets/assets/003/421/666/original/ef114b87-0c4d-4761-851f-8c7ab81525b1.png)
- Windowing model: Select an existing windowing model (see Creating a Windowing Model).
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Extrapolation method: Select different extrapolation method for different windows.
- Formula: A constant number or a user defined formula such as V0+K.
- Linear: Calculates a linear function based on the first and last point of the log curve in a window. If only 1 point is available, the value is extrapolated.
- Volume: Where a log curve is not available, takes the value from the volume. Only a volume in the same domain as the output extent is accepted.
- Horizon: Where a log curve is not available, takes the horizon property value.
![](https://media.screensteps.com/image_assets/assets/003/425/940/original/440fb409-92c6-4b95-8d36-df1228ae6628.png)
- By default, the output curve name uses the following values: extrap: Curve Class Process Name.
- For example: extrap: P Velocity Curve Extrapolator.
- Enable custom name: Allow the user to define the process output curve name.
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Extent: Output can be in MDKB, TWT or TVDSS domain.
- On the fly (Run time) curve uses Checkshot velocity is used for domain conversion.
- Enter the start, stop and step size.
- Reset: automatically set the start and stop values to match the input curve.