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1. An oil well, drilled on 80-acre spacing, produces at a rate of 300 STB/D under pseudo-steady-state conditions. Calculate the permeability assuming the following data apply: h 30ft. 1.3 cp B. - 1.50 RB/STB PR - 3200 psia Pus - 2900 psia r - 4 in. S o 2. The permeability of the formation, given in problem 1, was increased during a well treatment to 300 md out to a radius of 16 inches. Calculate the pseudo-steady-state flow rate after the treatment. 3. The flowing wellbore pressure in a well producing from a reservoir above the bubble point has been declining at a constant rate of 1 psi/day. What is the porosity if the flow rate is 200 STB/D? The reservoir characteristics are as follows: A 600 Acres h 40ft Bo = 1.40 RB/STB Ho 0.5 cp Ct = 1.5 x 105 1/psi 4. Number range CHAPTERWells #1, in a new oil reservoir, produced at a constant rate of 400 STB/D. Well #2 in the same reservoir started to produce at a constant rate of 600 STB/D, 50 days after Wells #1 started to produce. Wells #1 production rate was reduced to 300 STB/D after it had produced for 70 days. Well #2 production rate was reduced to 400 STB/D after it had produced for 30 days. The reservoir data are as follows: k 50 md h 50ft. Q 0.15 B0 = 1.50 RB/STB Ho =0.75cp 1.5x 105 1/psi P1 = 4000 psia rw = Tw2 =6 inches S1=52=0 Distance between the Wells = 2000 ft. Distance to the Boundary = 10,000 ft. a. What was the pressure in Well #2 before it started to produce? b. What was the pressure in Well #1 after it had produced for 70 days? c. What was the pressure in Well #2 after it had produced for 30 days? d. What was the pressure in Well #1 after it had produced for 100 days?

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