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UNIVERSIDAD INDUSTRIAL DE SANTANDER
ESCUELA DE INGENIERIA DE PETROLEOS
TALLER DE ANALISIS DE PRESIONES

1) A single well located in a deepwater reservoir is producing oil at a constant rateof 5500 STB/D.
Calculate the pressure at the wellbore and at a location 500 feet away from the well after 5 days, and 10 days of production.
The drainage boundary of the well is located 1000 feetaway. Other rock and fluid properties of the reservoir are as follows:
Initial pressure, 19,250 psia Formation thickness, 345 ft
Formation permeability, 7 md Formation porosity, 0.19
Totalcompressibility, 4 10–6 psi–1 Oil viscosity, 4.5 cp
Oil FVF, 1.1 RB/STB Reservoir boundary, 1000 ft
Wellbore radius, rw 0.5 ft skin factor: 2

2) Calculate the total pressure drop at anobservation well located 1500 feet from a producing well in a virgin reservoir after 35 days. The single production well was maintained at a constant production rate of 300 STB/D for 10 days; then the ratewas increased to a constant rate of 500 STB/D for an additional 25 days. The initial reservoir pressure was 2500 psia. Assume the reservoir was infinite acting during this test. Other reservoir andfluid properties are as follows:
Initial pressure, 2500 psia Formation thickness, 15 ft
Formation permeability, 300 md Formation porosity, 0.24
Total compressibility, 6 _ 10–6 psi–1 Oilviscosity, 4.2 cp
Oil FVF, 1.2 RB/STB Wellbore radius, rw 0.5 ft

3) A reservoir at initial pressure of 2500 psia has two wells (Well A and Well B) on production for 35 days from initial production.Well A produced at a constant rate of 500 STB/D and is located 750 feet from an observation well. Well B produced at a constant rate of 300 STB/D and is located 1000 feet from the same observationwell. If the reservoir is infinite in size, calculate the total pressure drop measured at the observation well at the end of 35 days. This reservoir has the same rock and fluid properties as the...
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