Specific operations require specific processing, such as multirate gas tests, interference tests, multilayer tests, etc. Ecrin well testing software. The data are captured during dedicated well test operations such as DSTs or production tests or during routine operational shut-ins by Permanent Downhole Gauges (PDG). The diagnostic plot of choice is the loglog plot where the pressure and the Bourdet derivative allow the identification of reservoir geometry and properties, these are then matched with models. Pressure Transient Analysis, or PTA, is, in most cases, about analyzing high frequency, high resolution shut-in data. The pressure response from these shut-ins can be used to provide information about the reservoir within the radius of investigation for radial flow or the area of investigation for more complex geometries.
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