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1	PETE 310 Lectures # 12 -13 Properties of Dry Gases (pages 165-187)
2	Phase Diagram of a Dry Gas Reservoir
3	"DRY GAS RESERVOIRS:" DRY GAS RESERVOIRS: GOR > 100,000 SCF/STB No liquid produced at surface Mostly methane
4	Standard Conditions Unify volumes to common grounds for sales and regulatory purposes T = 60 ⁰F P = 14.65 – 15.025 (State dependent) Then V_M= RT_sc/P_sc
5	Reservoir Engineering Properties of Dry Gases Gas formation volume factor Bg
6	Gas Formation Volume Factor [res bbl/SCF] or [ft³/SCF]
7	Gas Formation Volume Factor [res bbl/SCF] or [ft³/SCF]
8	Gas Formation Volume Factor
9	Gas Formation Volume Factor [res bbl/SCF] or [ft³/SCF]
10	Viscosity Definition & Units Viscosity is a measure of the resistance to flow exerted by a fluid This is called dynamic viscosity and has units of centipoise = g mass / 100 sec cm Kinematic viscosity is viscosity / density, units are in centistokes = centipoise /g/cc
11	Reservoir Engineering Properties of Dry Gases Gas Viscosity
12	Viscosity of Ethane
13	Viscosity of Gases at Atmospheric Pressure
14	Viscosity of Gas Mixtures
15	Example
16	Example Read Molecular Weights table A-1 page 492 Read Viscosities figure 6-7 Apply formula…
17	Gas Viscosity if Composition is Unknown
18	Viscosity Corrections
19	Viscosity of Gases at High Pressure
20	Viscosity of Gases at High Pressure
21	Accuracy for Viscosity Correlations? At low P_prand low gravities + 2% Agreement is less accurate as specific gravity increases (fig. 6-12 has about 20% accuracy)
22	Isothermal Compressibility Definition Derivative is evaluated at constant T = T_A and specified pressure P = P_A
23	Isothermal Gas Compressibility
24	Isothermal Compressibility (Cg)
25	Isothermal Compressibility Using ideal gas equation
26	Isothermal Compressibility Using real gas equation
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