3.1 Construct IPR of a vertical well in an oil reservoir. Consider (1) transient flow at 1 month, (2) steady-state flow, and (3) pseudo-steady-state flow. The following data are given: Porosity, o = 0.25 Effective horizontal permeability, k = 10 md Pay zone thickness, h = 50 ft Reservoir pressure, pe or p= 5,000 psia Bubble point pressure, p, = 100 psia Fluid formation volume factor, B. Fluid viscosity, H. = 1.5 cp Total compressibility, c, = 0.0000125 psi- Drainage area, A = 640 acres (re = 2,980 ft) Wellbore radius, rw Skin factor, S = 5 1.2 %3D %3D 0.328 ft %3D

3.1 Construct IPR of a vertical well in an oil reservoir. Consider (1) transient flow at 1 month, (2) steady-state flow, and (3) pseudo-steady-state flow. The following data are given: Porosity, o = 0.25 Effective horizontal permeability, k = 10 md Pay zone thickness, h = 50 ft Reservoir pressure, pe or p= 5,000 psia Bubble point pressure, p, = 100 psia Fluid formation volume factor, B. Fluid viscosity, H. = 1.5 cp Total compressibility, c, = 0.0000125 psi- Drainage area, A = 640 acres (re = 2,980 ft) Wellbore radius, rw Skin factor, S = 5 1.2 %3D %3D 0.328 ft %3D

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.11P

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9) A well is located in a confined aquifer near the intersection of a constant head and impervious boundary. a) Estimate the steady state drawdown in the well for Q=2 ft³ s, rw = 1 ft, distance from the well to stream= 300ft and distance from well to impervious boundary= 150 ft. T = 0.14ft²/s b) Estimate the steady state drawdown at point P located midway between the well and the steam. The angle between the stream and the impervious boundary is 90°
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Please explain part 1 (ii) of the question given. 1) i) A 6 inch diameter well that fully penetrates a 40ft thick open aquifer is pumped at a rate of 100 gpm. The drawdown in the well is 22ft when a steady water level is established. The drawdown in a well 152ft distant is 12ft. Estimate the coefficient of permeabiliity of the soil deposit. Answer of permeability is K= 9.88 x10-4 ft/sec. ii) Discuss the validity of the answer obtained in 1( i ) and suggest how would you improve the test data obtained to produce a better value of k. Why?
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