Problem:
A volumetric gas field with area of 640-acre and average net productive formation thickness of 100 ft has an initial pressure of 4200 psia, a porosity of 17.2 percent, and connate water of 25 percent. The gas formation volume factor at 4200 psia is 0.003425 cu-ft/SCF and at 750 psia is 0.01852 cu-ft/SCF.
Required:
Question 1: Calculate the initial in-place gas in standard cubic feet
Question 2: Calculate the initial gas reserve in standard cubic feet, assuming an abandonment pressure of 750 psia.
Question 3: Calculate the recovery factor based on an abandonment pressure of 750 psia.
Note: Provide support for your rationale.