Page 419 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Properties of Hydrocarbon Mixtures 185

Flgure 6-11. Pressurevolume relation of reservoir fluid at 285°F (constant
mass expansion) Ill].

at the original cell volume. The gas removed during the constant pressure
displacement was analyzed. The determined compositions (Figure 6-14),
computed GPM content (Figure 6-15), respective compressibility (deviation)
factors and volume of wellstream produced during depletion (Figure 6-16)
are presented in Table 67. The volume of retrograde liquid resulting from
the gas depletion is shown in Table 6-8 (and Figure 6-17), both in terms
of barrels of reservoir liquid and percent of hydrocarbon pore space. Shown
in Table 6-7 are the compositions of the gas and liquid remaining in the
reservoir after depletion to abandonment pressure.
Equilibrium Flash Calculations. The produced compositions and volumes from
a depletion study were used in conjunction with equilibrium constants K (derived
from a Wilson modified R-K equation of state) to calculate cummulative stock