Calculate Methane Volume from Pressure, Temp & Density?

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SUMMARY

The discussion focuses on calculating the volume of methane using pressure, temperature, and density, specifically under non-ideal gas conditions. The user has identified the need to apply the Z compressibility factor (Z = 0.81) and the ideal gas law, represented as PV = ZnRT, to derive the number of moles (n) of methane. The user has provided specific values for pressure (P = 2195 psia), temperature (T = 580 °R), and the gas constant (R = 10.73 psia). The goal is to find the gas volume to subsequently calculate the formation volume factor (Bg).

PREREQUISITES
  • Understanding of the ideal gas law and its limitations.
  • Knowledge of the Z compressibility factor and its application.
  • Familiarity with the concepts of gas density and formation volume factor (Bg).
  • Basic skills in thermodynamics and gas properties.
NEXT STEPS
  • Study the application of the Z compressibility factor in real gas calculations.
  • Learn how to derive gas volume using the equation PV = ZnRT.
  • Research methods for calculating gas density under varying pressure and temperature conditions.
  • Explore the concept of formation volume factor (Bg) and its significance in reservoir engineering.
USEFUL FOR

Students in chemical engineering, professionals in petroleum engineering, and anyone involved in gas property calculations and reservoir analysis will benefit from this discussion.

glocki35
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Homework Statement



Can I calculate the volume of Methane if I have the pressure, Temperature and the density?, this is required to calculate the number of moles (n) for Methane, which is given by n = total gas weight / molecular weight, I can not get the total gas weight unless I calculate the volume, I am totally stuck, can anyone help?

Homework Equations





The Attempt at a Solution

 
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What kinds of pressures are you talking about? Under most conditions, the ideal gas equation is a pretty good approximation to the truth, what does that state?
 
HI sjb-2812, this is not for an ideal gas so I have to use the Z compressibility factor, I have already calculated Z i.e PV=ZnRT, these are the knowns;
z=0.81, R=10.73 psia...T=580 Deg P=2195 psia n = ??at reservoir conditions, for standard conditions these are the knowns- Zsc=1.0, R=10.73, Tsc = 520 Deg R, Psc=14.7 psia & n = ??, this is all of the information I have, I am attempting to find the number of moles n (n=volume at reservoir conditions / volume at standard conditions) by finding the gas density and in turn the volume so I can calculate Bg the gas FVF (formation volume factor), I know how to find the gas density, however how do you find the gas volume with this information?, this is where I am stuck, perhaps my reasoning in flawed, I just don't know...thanks
 

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