Page 38 - Petroleum Production Engineering, A Computer-Assisted Approach

Guo, Boyun / Computer Assited Petroleum Production Engg 0750682701_chap02 Final Proof page 27 22.12.2006 7:08pm

PROPERTIES OF OIL AND NATURAL GAS 2/27
2.8 The solution gas–oil ratio of a crude oil is 2.10 Estimate gas viscosities of a 0.70-specific gravity gas
3
3
4,000 sm =m at 20 MPa and 50 8C. Given the follow- at 90 8C and 1 MPa, 5 MPa, 10 MPa, and 50 MPa.
ing PVT data: 2.11 Calculate gas compressibility factors and densities of
a 0.65-specific gravity gas at 80 8C and 1 MPa,
Bubble-point pressure: 15 MPa 5 MPa, 10 MPa, and 50 MPa with the Hall–Yarbor-
Oil-specific gravity: 0.8 water ¼ 1 ough method. Compare the results with that given by
Gas-specific gravity: 0.77 air ¼ 1,
the Brill and Beggs correlation. What is your conclu-
estimate densities and viscosities of the crude oil at sion?
50 8C, 15 MPa, and 20 MPa. 2.12 For a 0.65-specific gravity gas at 110 8C, calculate
and plot pseudo-pressures in a pressure range from
2.9 For the gas composition given below, determine
apparent molecular weight, specific gravity, pseudo- 0.1 to 30 MPa. Under what condition is the pseudo-
critical pressure, and pseudo-critical temperature of pressure linearly proportional to pressure?
the gas.
Component Mole Fraction
C 1 0.755
C 2 0.073
C 3 0.011
i-C 4 0.006
n-C 4 0.002
i-C 5 0.003
n-C 5 0.008
C 6 0.001
C 7þ 0.001
N 2 0.070
CO 2 0.050
H 2 S 0.020