A test was carried out on a 2-meter diameter clay open well. Calculate the yield in m 4 /hr of the said well at a specific point in time when the depression head is 2 m.
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A test was carried out on a 2-meter diameter clay open well. Calculate the yield in m 4 /hr of the said well at a specific point in time when the depression head is 2 m.
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- A recuperation test was carried out on a 1.5-meter diameter clay open well. Calculate the yield in m/hr of the said well at a specific point in time when the depression head is 1 m.A recuperation test was carried out on a 1.2-meter diameter clay open well. Calculate the yield in m 3 m3/hr of the said well at a specific point in time when the depression head is 0.8 m. Show your solutionA recuperation test was carried out on a 1.5-meter diameter clay open well. Calculate the yield in m3 /hr of the said well at a specific point in time when the depression head is 0.75 m. Show your solution.
- Answer both 1 (i) and (ii) 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. 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?The bottom diameter of a dug well in fine sand region to obtain 10 e/s of yield under a depression head of 2.5 m. The value of specific capacity per unit area may be taken as 0.6 h-¹ isDuring the recuperating test, the water level was initially lowered by 2.65 m and is recuperated by 1.45 m in 1 hour. Determine the yield (in litre per sec) from an open well of diameter 3 m under a depression head of 3.45 m.
- Question 3 a. An oil well in the Nameless Field is producing at a stabilized rate of 600 STB/day at a stabilized bottom-hole flowing pressure of 1800 psi. Analysis of the pressure buildup test data indicates that the pay zone is characterized by a permeability of 120 md and a uniform thickness of 25 ft. The well drains an area of approximately 40 acres. The following additional data is available: w = 0.25 ft, A = 40 acres Bo = 1. 25 bbl/STB, Ho = 2. 5 cp Calculate the pressure profile (distribution) and list the pressure drop across 1 ft intervals from rw to 1.25 ft, 4 to 5 ft, 19 to 20 ft, 99 to 100 ft, and 744 to 745 ft.Ex.4: A well of diameter 12 ½ in ( capacity = 0.15 bbl/ft ) is drilled by drilling mud of density 9.6 ppg at drilling velocity of 23 ft/min and flow rate 720 gpm, if the density of cutting rock is 20.8 ppg. Find the density of drilling mud in the annulus taking in to account effect of cutting rock?Determine the diameter of an open well in coarse sand to give an average yield of 200 lpm under a safe working depression head of 2.5 m (Hint: for coarse sand C = 1 hr-1).
- The following data relate to a pump-out test: Diameter of well = 24 cm; Thickness of confined aquifer = 27 m; Radius of circle of influence = 333 m; Draw down during the test = 4.5 m; Discharge = 0.9 m^3/s.What is the permeability of the aquifer in mm/s? Choices: a. 2.15 x 10^-2 b. 4.5 x 10^-1 c. 93 X 10^-1 d. 1.6 X 10^-13.1 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, = 1.2 Fluid viscosity, M. = 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 0.328 ftQuestion 2 * A well with a diameter of 0.6 m is constructed in a confined aquifer. The sand aquifer has a uniform thickness of 15 m, overlain by an impermeable layer with a depth of 35 m. A pumping test was conducted to determine the coefficient of permeability of the aquifer. The initial piezometric surface was 15 m. below the ground surface datum of the test well and observation wells. After water was pumped at a rated of 13 liters/sec for several days, water levels in the wells stabilized with the following drawdowns, 6.4 m in the test well, 3.7 m in the observation well 10 m from the test well, and 2.4 m in the second observation well at a distance of 30 m. From these data: o Find the depth of the water in the test well Calculate the permeability of the aquífer.