Reservoir Fluid Properties - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 16

and the following abbreviations:

BFPD Barrels of fluid per day

BGPD Barrels of gas per day

BOPD Barrels of oil per day

BWPD Barrels of water per day

cf/B Cubic feet per barrel

scf/D Standard cubic feet per day

Single-Component Hydrocarbon System

The behavior of a single-component hydrocarbon system is illustrated in Fig. 3.1 .
On the graph, pressure is plotted against volume, and the resulting curve is called
the vapor - pressure curve . As the pressure on a fixed mass of hydrocarbon liquid
is reduced, its volume increases slightly until the bubble-point is reached. Further
increasing the volume available leaves the pressure constant and more and more
of the liquid hydrocarbon converts to the gaseous phase. As the volume continues
to increase, eventually the dew-point is reached and no further liquid hydrocarbon
is present; from then on, further increases in volume result in reductions in pres-
sure. The PV diagram shown in Fig. 3.1 is for a fixed temperature. The effects of
temperature can be understood by reference to Fig. 3.2 . Note that at high

Fig. 3.1 Phase behavior of a single-component hydrocarbon. Courtesy Schlumberger