A well is producing at a rate of 300 STB/D from a reservoir above the bubble point. The reservoir characteristics are as follows:
A = 900 Acres h = 50 ft. Bo = 1.50 RB/STB ct = 1.5 x 10-5 psi-1
Estimate the formation the porosity assuming the wellbore pressure has been declining at a constant rate of 1 psi/day.
2. Number range CHAPTERWell #1, in a new oil reservoir, produced at a constant rate of 400 STB/D. 60 days after Wells #1 started to produce, Well #2 in the same reservoir started to produce at a constant rate of 400 STB/D. The production rate in Wells #1 was reduced to 300 STB/D after it had produced for 90 days. The production rate in Well #2 was reduced to 300 STB/D after it had produced for 30 days. The reservoir data are as follows:
k = 50 md h = 50 ft. φ = 0.15
Bo = 1.50 RB/STB μo = 0.75 cp ct = 1.5 x 10-5 1/psi
Pi = 4000 psia rw1 = rw2 =6 inches s1 = s2 =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 90 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 120 days?
3. The following data are from the only well in a reservoir, which based on the geologic and seismic data is believed to near a fault. Confirm the existence of the fault from the build-up data and estimate the distance to the fault, k, s, and the average reservoir pressure.
tp = 43,869 hrs. q = 4858 STB/D rw = 0.356 ft.
A = 81 acres h = 110 ft. φ = 26%
Bo = 1.19 RB/STB μ = 0.50 ct = 129 x 10 -6psi-1
Number range CHAPTER Number range CHAPTER
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