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The reason they do not coincide is because the semilog lines were placed too early in order to capture some information about the skin from the much shorter buildups of the isochronal sequence (0.5 hours versus 20 hours final buildup time). The red point is associated with the model skin from buildup #4, the yellow point is the semilog skin from the same buildup. C01.2 Saphir screen after generation of skin versus rate plot The Skin versus Rate plot contains two straight lines, the red is the constant model skin and the green is the regressed line through the skin values transported from the semilodig lines. See Figure B01.3.ĥ Ecrin v Doc v KAPPA Saphir Guided Session #4 SapGS04-5/11 Fig. Maximize the history plot and observe that although the simulated pressure matches very well the final buildup there are discrepancies between the model and the real data early on in the test. B01.2 Analysis screen The results can be checked and browsed by a click on. The Saphir screen should look like Figure B01.2.

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We will illustrate how to deal with this later. The late time data in the buildup appear to be affected by a boundary or some composite system. Continue until the match is satisfactory. Adjust your match manually by click and drag in the loglog plot and run the automatic model again. B01.1 Load formatting B01.2 Analysis Proceed to extract the final buildup and run the automatic model. Hit the Load button.Ģ Ecrin v Doc v KAPPA Saphir Guided Session #4 SapGS04-2/11 Fig.

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Click Next and pick up the flowrate file as Free format if not already selected, Figure B01.1 right. Hit the Load Q button and choose SapGS04.rat. This dialog only pops up in case of time overlap: identical time for different pressure data.

You will be prompted to correct Time, by default the 'Ignore new data' option is checked, click OK. Click Next and make sure you choose the Field format with the first field as Date (DD-MM-YYYY) the second field as Time of day (ToD Auto) and the third field as the Pressure as illustrated in Figure B01.1 left.

Click on Load P and browse to SapGS04.pre. Click Create to accept the default and proceed to load the pressure file. Next will call up the dialog where you can define the pseudo pressures range. To define the gas properties and correlations click on, but leave the default parameters. When you click on Next you will see that you are automatically taken to the PVT parameters dialog in order to define the gas properties necessary to construct pseudo pressures which are used for the analytical gas test analysis. Set the reference date to 30 July 2001 at midnight. Click on New and make sure you choose Gas as the Reference phase, standard analysis and default parameters. B01.1 Initialization Launch Saphir as stand alone or through the Ecrin workstation suite. B01 Modified isochronal gas test This guided session covers a modified isochronal gas test of five rates and four buildups with approximate duration of 0.5 hours prior to the extended flowing period of 1 hour followed by a final build up of some 20 hours duration. You will require the rate and pressure files stored during installation in the Examples directory SapGS04.pre and SapGS04.rat. This session is also with a different reference fluid that requires you to go through more initialization dialogs, in particular of how to setup and build the PVT model for this gas test.

In this session we will repeat this to remind you how to properly proceed. The guided session #1 already covered the initialization process and the loading of data. 1 Ecrin v Doc v KAPPA Saphir Guided Session #4 SapGS04-1/11 Saphir Guided Session #4 A01 Requirements It is assumed that you have already studied the guided sessions #1 and #2.

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