Fitting a Decline Curve

The DCA module provides the user with a set of graphical tools to fit an exponential or hyperbolic curve to the production data.  Manual and automatic curve fits are provided via the buttons below.

Manual Exponential method

For a Manual Exponential Method, click the LMB on the location of the initial decline (Qi) and terminal decline points (Qt).  The exponential line is fit and model decline parameters as well as TA, REM and EUR are calculated and displayed on the graph and in the forecast box.

Manual Hyperbolic method

After clicking the LMB on the location of the initial decline (Qi) and terminal decline points (Qt), the mouse will be centered on the line at which point you can “bend” the line to match the production decline curve.  Once you have a match, click the LMB one more time and the hyperbolic line is displayed with model decline parameters as well as TA, REM and EUR calculated and displayed on the graph and in the forecast box.

Autofit Exponential and Hyperbolic methods

After clicking the selection box, move the mouse to the graph and draw a box around the area of the decline curve you want to curve fit.  Click the LMB again and the exponential or hyperbolic line is fit and model decline parameters as well as TA, REM and EUR are calculated and displayed on the graph and in the forecast box.