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
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.
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
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
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
k 50 md
B0 = 1.50 RB/STB
1.5x 105 1/psi
P1 = 4000 psia
rw = Tw2 =6 inches
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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