QuestionQuestion

The following information is available from a water drive wet gas reservoir:

Area = 4500 ac
Net Pay = 20 ft.
Average Porosity = 15%
Irreducible Water Saturation = 25%      
Initial Pressure = 3000 psia
Reservoir Temperature = 120oF

The aquifer properties are given below:
Infinite Radial, α = 360°
Φ = 20%, h = 50 ft, k = 50 md
μ = 1 cp, cₜ = 7 × 10⁻⁶ psi⁻¹

During the first year of the production, only the High Pressure Separator Gas was sent to the pipeline. The following information is available:

High Pressure Separator Gas Rate and Gravity = 25 MMcfd, 0.60
Low Pressure Separator Gas Rate and Gravity = 2.25 MMcfd, 0.67
Tank Gas Rate and Gravity = 250 Mcfd, 0.85
Tank Liquid Rate and Gravity = 1100 STB/D, 49°API
Reservoir Pressure after 183 days = 2843 psia
Reservoir Pressure after 365 days = 2720 psia

Predict the reservoir pressure for the next 5 years assuming:
a. Only the High Pressure Separator Gas will be sent to the pipeline.
b. Both the High Pressure and the low Pressure Separator Gases will be sent to the pipeline.

The contract rate is 25 MMcfd.

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