Question: Pressure data obtained from a constant-rate drawdown test run on an oil well are shown in the table below. Estimate formation permeability, skin factor,

Pressure data obtained from a constant-rate drawdown test run on an oil

Pressure data obtained from a constant-rate drawdown test run on an oil well are shown in the table below. Estimate formation permeability, skin factor, pressure drop due to skin, reservoir pore volume and flow efficiency knowing that: 9 = 260 stb/d = 0.1 Mo = 0.75 cp h = 65 ft Time, hr 0 1.62 3.44 4.29 5.51 6.32 7.28 8.44 10.82 11.49 15.9 18.8 22.2 26.4 31.3 37.3 44.5 53 63.3 75.7 90.6 108.5 129.5 155.5 186.5 223.5 267.5 320.5 384.5 461.5 B. 1.15 rb/stb S = 1 Pressure, psi 5427 4827 4714 4668 4651 4631 4622 4615 4608 4601 4588 4582 4576 4570 4564 4559 4552 4547 4541 4536 4530 4524 4518 4512 4505 4496 4487 4475 4461 4444 Co = 15.0 x 106 psi Tw = 0.25 ft

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