When the Sabine Gas Field was brought in it had a reservoir

When the Sabine Gas Field was brought in, it had a reservoir pressure of 1700 psia and a temperature of 160 degree F. After 5.00 MMM SCF was produced, the pressure fell to 1550 psia. If the reservoir is assumed to be under volumetric control, using the deviation factors as shown below, calculate the following: The hydrocarbon pore volume (Vi) of the reservoir. The SCF produced when the pressure falls to 1550, 1400, 1100, 500, and 200 psia. Plot cumulative recovery (Gp) in SCF versus p/z. The SCF of gas initially in place (G). From your graph, find how much gas can be obtained without the use of compressors for delivery into a pipeline operating at 750 psia (Gp at 750 psia). What is the approximate pressure drop per MMM SCF of production? If, however, it is assumed that during the production of 5.00 MMM SCF of gas, 4.00 MM bbl of water encroaches into the reservoir and still the pressure has dropped to 1550 psia, calculate the initial in-place gas. How does this compare with Problem (c)?

Solution

given the reservoir is volumteric flow controller

volumetric flow controller controls the flow rate

ambient pressure and temperature are the two parameters which wil affect the volumetric flow rate

given reservoir pressure is 1700psia where psia is pounds per square inch absolute

after 5MMMscf

pressurefall to 1550 psia

the pore volume in a reservoir formation available to hydrocarbon intrusion is the hydrocarbon pore volume

reservoir temperature is 160^0f