PNG 520
Phase Relations in Reservoir Engineering

Action Item


Answer the following problems, and submit your answers to the drop box in Canvas that has been created for this module.

Please note:

  • Your answers must be submitted in the form of a Microsoft Word document.
  • Include your Penn State Access Account user ID in the name of your file (for example, "module2_abc123.doc").
  • The due date for this assignment will be sent to the class by e-mail in Canvas.
  • Your grade for the assignment will appear in the drop box approximately one week after the due date.
  • You can access the drop box for this module in Canvas by clicking on the Lessons tab, and then locating the drop box on the list that appears (this needs update)

Problem Set

  1. Consider Methane (Pc = 666 psia, Tc = – 117 F) and Ethane (Pc = 706 psia, Tc = – 90 F) stored in two different vessels at the following conditions:

    Methane and Ethane stored in two different vessels
    Methane Vessel P = 1332 psia T = 55 F
    Ethane Vessel P = 1412 psia T = 95 F
    Using the Standing-Katz Z-factor plot, determine the compressibility factor of both substances. Any observation? Are those values different? Describe the situation for both gases. If their Z-factors are the same, does it mean that both gases have the same density? What does it mean?