Assuming volumetric behavior/ Science
The â??Mâ?? sand is a small gas reservoir with initial bottom-hole pressure of 3200 psia and bottom-hole temperature of 220 oF. It is desired to inventory the gas in place at three production intervals. The pressure-production history and gas volume factor in cubic feet per standard condition of 14.7 psia and 60 oF are as follows:
Pressure Cumulative Gas Production Gas Formation Volume Factor
(psia) (MMSCF) (cu-ft/SCF)
3200 0 0.0052622
2925 79 0.0057004
2525 221 0.0065311
2125 452 0.0077360
(a) Calculate the initial gas in place using production data at the end of each of the production intervals, assuming volumetric behavior.
(b) Explain why the calculations of part (a) indicate a water drive
(c) Show that a water drive exist by plotting the cumulative production versus P/Z.
