I need help with my assignment. I have attached a word doc with the a few problems that I need help with. Thank you!
APPLIED RESERVOIR ENGINEERING
Due: Thursday, March 30th, 2016 in class
1. A gas reservoir under partial water drive produced 12.0 MMM SCF when the average
reservoir pressure had dropped from 3000 psia to 2200 psia. During the same interval, an
estimated 5.20 MM bbl of water entered the reservoir based on the volume of the invaded
area. If the gas deviation factor at 3000 psia and bottom-hole temperature of 170oF is 0.88
and at 2200 psia is 0.78, what is the initial volume of gas in place measured at standard
2. The initial daily production from a gas-condensate reservoir is 186 STB of condensate,
3750M SCF of high-pressure gas and 95 M SCF of stock tank gas. The tank oil has a gravity
of 51.2 oAPI at 60oF. The specific gravity of the separator gas is 0.712 and of the stock tank
gas, 1.30. The initial reservoir pressure is 3480 psia, and the reservoir temperature is 220 oF.
Average hydrocarbon porosity is 17.2%. Assume standard conditions of 14.7 psia and 60oF.
a. What is the average gravity of the produced gases?
b. What is the initial gas-oil ratio?
c. Estimate the molecular weight of the condensate.
d. Calculate the specific gravity (air = 1.00) of the total well production.
e. Calculate the gas deviation factor of the initial reservoir fluid (vapor) at initial
f. Calculate the initial moles in place per acre-foot.
g. Calculate the mole fraction that is gas in the initial reservoir fluid.
h. Calculate the initial (sales) gas and condensate in place per acre-foot.
3. The following data are taken from a study on a recombined sample of separator gas and
separator condensate in a PVT cell with an initial hydrocarbon volume of 3958.14 cu cm.
The wet gas GPM and the residue gas-oil ratios were calculated using equilibrium ratios for
production through a separator operating at 300 psia and 70 oF. The initial reservoir pressure
was 4000 psia, which was also close to the dew-point pressure, and reservoir temperature
a. On the basis of an initial reservoir content of 1.00 MM SCF of wet gas, calculate the
wet gas, residue gas and condensate recovery by pressure depletion for each pressure
b. Calculate the dry gas and condensate initially in place based on 1.00 MM SCF of wet
c. Calculate the cumulative recovery and the percentage of recovery of wet gas, residue
gas and condensate by depletion performance at each pressure.
d. Place the recoveries at an abandonment pressure of 605 psia on an acre-foot basis
corresponding to a porosity of 10% and connate water saturation of 20%.
Composition in mole percentages
Mol. Wt C7+
Gas deviation factor for wet gas at 186 F
Wet gas production, cu am at cell P and T
Wet gas GPM (calculated)
Residue gas-oil ratio
Retrograde liquid, percentage of cell volume
4. Given the following data for a gas-condensate reservoir and the accompanying PVT test.
Sp. Gr. C6+ at 60oF
Z-factor for wet gas
at cell T
Wet Gas Prodn.
(cc at cell P,T)
(% of cell volume)
Initial cell volume
Wet Gas GPM
The PVT test indicates 25% liquid recovery of butane, 50% recovery of pentane.
a) What is the liquid recovery of C6+ indicated by the above data?
b) What is the recovery of gross gas, residue gas and condensate at 3400 psia?
c) If the residual hydrocarbon (gas + condensate) saturation is 20%, what is the recovery of
residue gas, assuming complete water influx occurred when the pressure was 3400 psia and
the reservoir pressure stabilized at 3400 psia.
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