Problem 1. Calculate relative density (specific gravity) of the following natural gas. All compositions are in mole percent. Yi moles M Te (R) Pe (psia) C1 83.19 16.04 343 668 C2 8.48 30.07 550 708 C3 4.37 44.10 666 616 ic 0.76 58.12 735 529 nC4 1.68 58.12 766 551 ics 0.57 72.15 829 490 nc5 0.32 72.15 846 489 C6 0.63 86.18 914 437 Total 100.00 Problem 2. Calculate actual density of the same mixture at 1,525 psia and 75°F. Problem 3. Calculate the viscosity at 150°F and 2,012 psia for the gas of the composition shown in Table. Use Karr- Kobayashi-Barrows method. Mole Mi, Tc("R) Pc (Psia) Fraction Molecular Weight Nitrogen 0.156 28.02 228 492 Methane 0.739 16.04 343 668 Ethane 0.061 30.07 550 708 Propane 0.034 44.09 666 616 i-butane 0.002 58.12 735 529 n-butane 0.006 58.12 765 551 Total 1.000 Problem 4. A Volumetric gas reservoir has the following data: Initial conditions: P-4000 psia, Gas Gravity Og -0.7 Reservoir Temperature, T = 230 °F Conditions at one year; P-3500 psia, Gp 4x10 scf at 14.7 psia and 60 °F a) Calculate the original gas in place, G b) Find the reservoir pressure after cumulative production of 8x10 scf. c) Find the cumulative gas produced at a reservoir pressure of 2000 psia.