Author/Authors :
Saeedi Dehaghani, Amir Hossein Petroleum Engineering Department - Faculty of Chemical Engineering - Tarbiat Modares University, Tehran, Iran , Karami, Saeed Petroleum Engineering Department - Faculty of Chemical Engineering - Tarbiat Modares University, Tehran, Iran
Abstract :
Prediction of gas reservoir performance in some industrial cases requires costly and
time-consuming simulation runs and a strong CPU must be involved in the
simulation procedure. Many reservoir parameters conform to a strong aquifer
behavior on gas reservoir performance. Effects of parameters, including reservoir
permeability, aquifer permeability, initial reservoir pressure, brine water salinity,
gas zone thickness, water zone thickness, temperature, tubing diameter, reservoir
inclination, the effective intruding angle of the aquifer, and porosity were
investigated using Tornado chart, and seven parameters were filtered. Response
functions of aquifer productivity index, gas recovery factor, initial maximum gas
production, water sweep efficiency, gas production rate, water breakthrough time,
and water production were defined statistically, using Eclipse E100 and BoxBehnken design (BBD). According to the formulae generated by the BBD based on
simulation runs, reservoir permeability, aquifer permeability, well-head pressure,
and gas zone thickness are the most influencing parameters on the gas reservoir
performance supported by the strong aquifer. The aquifer was found to be important
especially due to its productivity index and sweep water efficiency. Validation of
results given by the BBD through simulation runs showed response functions of
aquifer productivity index, sweep water efficiency, maximum gas production, and
recovery factor are of deviation percentages in the ranges of 10.61%, 6.302%,
3.958%, and 2.04%, respectively.
Keywords :
Aquifer , Box-Behnken , Gas Reservoir , Gas Production Permeability
