1. An oil reservoir which appears to have a gas cap is under evaluation for further development. Previously (Homework 5), the initial oil and gas-in-place were estimated by volumetric method. The wells in the reservoir were produced at the constant rate of 300 STB/D. Determine the initial oil and gas-in-place by material balance method based on the pressure and production data given below. The PVT data were given in Homework 5. If necessary, adjust the reservoir description to match the volumetric estimate with the material balance results.
PRODUCTION         RESERVOIR         WELLS          Rp
TIME                         PRESSURE
DAYS                               PSIA             NUMBER   SCF/STB
0                                       2500                      4          650.0
549                                    2400                      4          642.0
916                                    2300                      6          656.4

2. The following information is available from a wet gas reservoir:

PRODUCTION          RESERVOIR            SEPARATOR      TANK          TANK
TIME                         PRESSURE                                     GAS RATE    LIQUID RATE
YEAR                            PSIA                      MMCFD          MCFD          STB/D
0                                     3500                    50                   1650
1                                     3082                                                                      3500
2                                     2782

Reservoir Temperature = 130oF Separator Gas Gravity = 0.60
Tank Gas Gravity = 0.75 Tank Oil Gravity = 55o API

The reservoir is connected to an infinite aquifer with the following information
Reservoir Area = 2400 acres
Porosity = 0.2                               Permeability = 50 md
Water Viscosity = 1 cp                  ct = 7×10-6 1/psi
α = 360o                                      Wp = 0

Determine the initial wet gas in place and the aquifer constant.Number range CHAPTER

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