Click on the Setup menu and then in calculation and graph parameters, the following dialog box will appear.

This allows the line thicknesses of curves to be modified. As explained above, also from here, new limits for the work space can be set. Further, it allows modification of streamlines and colours of the daily fractional recovery curves.

For the latter, another practice option is available. By clicking on the coloured squares which are in the Wells button on the left of the window, this can be done in a more practical way.

IV. 2.6.1. Problem parameters

Here, the values of dispersivity and porosity must be entered. The injected mass of tracer and the time of injection must also be entered. The type of tracer to use can be either chemical or radioactive. There is another, more practical, way to amend the problem parameters, by clicking on the appropriate button.

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• Streamline calculation: Values required for defining the number of streamlines of the problem are the angle swept by them and the distance between two successive points on one line. It also requires the total number of points to be entered.

• Time answer: The range of times to be displayed in the daily fractional recovery curve is entered.

• Frequency set-up: These are values required by the program for the calculations. The method of calculation works in the frequency domain and these values are needed. By setting them, it is possible to find better solutions to the problem being considered.

How to calculate the daily fractional recovery curves?

Once all the elements (production wells, injection wells and faults) have been inserted, select a PRODUCTOR and an INJECTOR. A red square or circle around the element indicates that this element has been selected, as shown in the following image.

Note the difference between the production well (square) and the injection well (circle).

Verify that the parameters of the calculation are the correct ones and that the wells are not inserts on both sides of a fault (otherwise, incorrect values will be found on the other side of the fault).

Then click the Calculate and Graph button, to display a dialogue box that prompts whether to continue or not. Click Yes. The program will then begin to calculate the streamlines and the daily fractional recovery curves.

Daily fractional recovery curves

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I Dady fractional recovery — Graph 1 Daily fractional

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Notice that two icons appear in the toolbar. One allows printing and the other copying the image displayed on the screen.

See the upper section of the frame.

Currently selected graph

Daily fractional recovery — Graph 1 Daily fractional recovery — Graph 2 Daily fractional recovery — Graph 3 Daily fr

Daily fractional recovery — Graph 1

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PORO TracerSim allows the creation of five different graphs. For example, if it is desired to calculate and show another daily fractional recovery curve of a different well, in another graph, then click on the Graph 2 button. Then return to the Wells button, and make the selection of the corresponding wells. Following a click on the Calculate and Graph button, a dialog box will be displayed that will give the option to continue or not. Click Yes. In this way, the program will begin to calculate the streamlines and the daily fractional recovery curves of the new well, and the result will be shown in Graph 2 (without erasing the other generated graphs).

To show a concentration graph, click in the Concentration output checkbox.

Concentration output

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Graph 1 Daily fractional recovery ■ Graph 2 Daily fractional recovery

Note that PORO makes it possible to select and modify the unit of the output parameter. In this case, when the tracer is chemical, the unit is mass per unit volume. For a radioactive tracer, the unit will be in becquerel per unit volume.