A sandstone reservoir has an average thickness of 85 feet and a total volume of 7,650 acre-feet. A well was drilled and cored through the reservoir. A rock sample was sent to the laboratory and the following tests were run. The dry weight of the core sample was found to be 140 grams while the sample dimensions were 1.575 in. long and 1.960 in. in diameter. Assuming the compressibility at 4,500 psi is the average compressibility in the reservoir, how much subsidence occurs when the reservoir pressure declines from 5,500 psi to 3,500 psi? What is sample pore volume and porosity? Sandstone density is 2.65 g/cc. Pressure, psi Cumulative pore volume change (-cc) 1000 0.122 2000 0.162 3000 0.196 4000 0.224 5000 0.25 6000 0.273 7000 0.298 8000 0.315
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A sandstone reservoir has an average thickness of 85 feet and a total volume of 7,650 acre-feet. A well was drilled and cored through the reservoir. A rock sample was sent to the laboratory and the following tests were run. The dry weight of the core sample was found to be 140 grams while the sample dimensions were 1.575 in. long and 1.960 in. in diameter. Assuming the compressibility at 4,500 psi is the average compressibility in the reservoir, how much subsidence occurs when the reservoir pressure declines from 5,500 psi to 3,500 psi? What is sample pore volume and porosity? Sandstone density is 2.65 g/cc.
|
Pressure, psi |
Cumulative pore volume change (-cc) |
|
1000 |
0.122 |
|
2000 |
0.162 |
|
3000 |
0.196 |
|
4000 |
0.224 |
|
5000 |
0.25 |
|
6000 |
0.273 |
|
7000 |
0.298 |
|
8000 |
0.315 |
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