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Petr 3520 HW 27

Gas MBE Average P Calculation

A gas reservoir is being drained by four wells (A, B, C, D), with the following reservoir properties:

For material balance calculations, an average pressure is needed. All four producing wells are shut in and the pressures are allowed to buildup for 60 hours. Cartesian plots of bottom hole pressure (BHP) vs. shut-in time are given above.

1. Read the approximate stabilized pressure at 60 hrs for each of the four wells. Consider these pressures to be the average pressure in the individual areas drained by the wells. (Note: In Pet 341 Well Testing you will learn about more sophisticated ways of determining average pressure in a well’s drainage area from pressure transient tests, but this is an easy and quick and (in many cases) acceptable method).

2. From these four pressures, determine the arithmetic average pressure for the entire reservoir. [p = 3193.8 psi] (depends on how you read the stabilized pressures)

3. From these four pressures, determine the pore volume weighted average pressure for the entire reservoir.

[p = 3198.2 psi] (depends on how you read the stabilized pressures)

(Note: This is an especially easy calculation in Excel. If you use Excel, paste your calculations table below).