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Question: an oil well has been drilled close to an observation...

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An oil well has been drilled close to an observation well. The distance between the drilled well and the observation well is estimated to be 1000 ft. A downhole pressure gauge is installed in the observation well to monitor the reservoir pressure. The drilled well is put on production at a rate of 100 STBD. Use the reservoir data given in the following and calculate the time required to record a pressure drop of 2.5 psi in the observation well. Note that the observation well acts like a point and the flow rate for this well is zero.

Reservoir external radius, re        5000 ft,

Total compressibility, ct        3 x 10^-6 psi-1

Oil viscosity, u    1cP                                                              

Oil formation volume factor, Bo             1.3 bbl/STB,

Reservoir permeability, k        400 mD,

Formation thickness, h        20 ft,

Initial reservoir pressure, Pi        2500 psia,

Formation porosity, (l)        0.15,

Well radius, rw,        0.3 ft.

Skin factor, S,        -2

An oil well has been drilled close to an observation well. The distance between the drilled well and the observation well is estimated to be 1000 ft. A downhole pressure gauge is installed in the observation well to monitor the reservoir pressure. The drilled well is put on production at a rate of 100 STBD. Use the reservoir data given in the following and calculate the time required to record a pressure drop of 2.5 psi in the observation well. Note that the observation well acts like a point and the flow rate for this well is zero. 5000 ft, 3x106 psi, Reservoir external radius, re Total compressibility, cu Oil viscosity, μ Oil formation volume factor, Bo Reservoir permeability, k Formation thickness, h Initial reservoir pressure, pi Formation porosity, ф Well radius, rw, Skin factor, S, 1. 3 bbl/STB, 400 mD 20 ft, 2500 psia, 0.15, 0.3 ft -2

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