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Oil is produced at a constant rate from a well in a bounded reservoir

Oil is produced at a constant rate from a well in a bounded reservoir

Q. Oil is produced at a constant rate from a well in a bounded reservoir. The variation of the bottom-hole pressure with time is shown in the given Table. The magnitude of the slope of the pressure vs time curve that you would use to find the drainage area is_____-psi/day (round off to 1 decimal place).

Time (days)Flowing bottom- hole pressure (psi)Time (days)Flowing bottom- hole pressure (psi)
0350062512
1286472482
2272582452
3264492422
42587102392
52542112362

Ans: 29-31

Sol:

Time (days)FBHP (psi)Slope (∆P/∆t), psi/day
03500 
12864-636
22725-139
32644-81
42587-57
52542-45
62512-30
72482-30
82452-30
92422-30
102392-30
112362-30

For a bounded reservoir having constant rate, well must be under pseudo-steady state condition, therefore the slope is -30 psi/day

Magnitude of slope is 30 psi/day

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