OilTank for Windows

The OilTank program generated the following graphs using an example file supplied with the program. In this example, a single well produces from a large reservoir. The PVT data and production data and historical pressure data was specified. No volumetric data was available. The example was taken from Amax, Bass and Whiting, Petroleum Reservoir Engineering, McGraw-Hill, Classic Textbook Re-Issue 1988, Chapter 8, The Material Balance, Example 8-4, pp.589-592.

This is a graph of Well Cumulative Oil Production versus Time. Note that the slope is approximately linear, indicating a near constant rate production rate.

This is a graph of the well Cumulative GOR versus Time. Note that the cumulative GOR increases dramatically as the reservoir pressure further declines below the bubble point.

This is a graph of the History Pressure versus time. Note that the measured reservoir pressure declines.

This is a graph of the History Pressure versus the Material Balance Pressure. Note that most Material Balance Pressure points are very close to the History Pressure points. This means that the correct IOIP was determined. In this case, the IOIP that best matches the given data is at N=120.1 MMSTB.

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