Special Report: ExxonMobil assays Kissanje blend crude

June 19, 2006
ExxonMobil Corp. conducted an assay of the Kissanje Blend crude from the Kizomba B project offshore Angola.

ExxonMobil Corp. conducted an assay of the Kissanje Blend crude from the Kizomba B project offshore Angola.

Esso Exploration Angola (Block 15) Ltd. started production from its Kizomba B deepwater project in July 2005 (OGJ Online July 18, 2005).

The $3.5 billion project involves development of 1 billion bbl of oil in Kissanje and Dikanza oil fields, which lie in 3,280 ft of water about 215 miles northwest of Luanda. Production from the fields is to peak at 250,000 b/d (OGJ, Feb. 14, 2005, Newsletter).

Kizomba B includes a tension-leg platform and what Esso Angola parent ExxonMobil Corp. calls the world’s largest floating production, storage, and offloading vessel. It has storage capacity of 2.2 million bbl.

Esso Angola completed the Kizomba B project in 31 months. Total production from Kizomba A, Kizomba B, and the Xikomba project, which went on stream in 2003, was expected to peak at more than 550,000 b/d by yearend 2005.

Esso holds a 40% interest in Block 15. Partners are BP Exploration (Angola) Ltd., 26.67%; ENI Angola Exploration BV, 20%; and Statoil Angola, 13.33%.

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Fig. 1 shows a true boiling point (TBP) curve for the whole crude. These data are from ExxonMobil.

Whole crude

Gravity, °API: 29.6
Specific gravity, 60° F.: 0.8783
Pour point, °F.: -33
Neutralization number (TAN), mg/g: 0.63
Sulfur, wt %: 0.402
Viscosity at 20° C., cst: 21.64
Viscosity at 40° C., cst: 10.89
Viscosity at 50° C., cst: 8.23
Viscosity at 100° C., cst: 3.04
Viscosity at 150° C., cst: 1.67
Mercaptan sulfur, ppm: 1
Nitrogen, ppm: 1,860
Conradson carbon residue, wt %: 4.27
Nickel, ppm: 13.6
Vanadium, ppm: 5.1
Calcium, ppm: 0.5
rvp, psi: 0.5
Heat of combustion, gross, btu/lb: 19,202
Heat of combustion, net, btu/lb: 18,024
Cetane index: 29

Butanes and lighter

Yield, vol %: 0.15
Gravity, °API: 119.94
Specific gravity, 60° F.: 0.5628
Carbon, wt %: 82.56
Hydrogen, wt %: 17.44
Viscosity at 20° C., cst: 0.35
Viscosity at 40° C., cst: 0.3
Viscosity at 50° C., cst: 0.28
Viscosity at 100° C., cst: 0.21
Viscosity at 150° C., cst: 0.17
Nitrogen, ppm: 2.6
Heat of combustion, net, btu/lb: 19,134
Paraffins, vol %: 100
Cetane index: 125

Light naphtha

TBP cut point, °F.: C 5-165
Yield, vol %: 5.47
Gravity, °API: 76.09
Specific gravity, 60° F.: 0.6816
Carbon, wt %: 84.74
Hydrogen, wt %: 15.26
Viscosity at 20° C., cst: 0.41
Viscosity at 40° C., cst: 0.35
Viscosity at 50° C., cst: 0.32
Viscosity at 100° C., cst: 0.23
Viscosity at 150° C., cst: 0.18
Nitrogen, ppm: 2.6
Heat of combustion, net, btu/lb: 18,711
Paraffins, vol %: 47.38
Naphthenes, vol %: 52.59
Cetane index: 32

Heavy naphtha

TBP cut point, °F.: 165-330
Yield, vol %: 12.7
Gravity, °API: 54.36
Specific gravity, 60° F.: 0.7613
Carbon, wt %: 85.77
Hydrogen, wt %: 14.23
Sulfur, wt %: 0.0088
Viscosity at 20° C., cst: 0.78
Viscosity at 40° C., cst: 0.63
Viscosity at 50° C., cst: 0.58
Viscosity at 100° C., cst: 0.38
Viscosity at 150° C., cst: 0.28
Mercaptan sulfur, ppm: 2.2
Nitrogen, ppm: 2.6
Heat of combustion, net, btu/lb: 18,535
Paraffins, vol %: 26.16
Naphthenes, vol %: 64.66
Aromatics, vol %: 9.32
Cetane index: 29

Kerosine

TBP cut point, °F.: 330-480
Yield, vol %: 13.93
Gravity, °API: 41.07
Specific gravity, 60° F.: 0.82
Carbon, wt %: 86.38
Hydrogen, wt %: 13.56
Pour point, °F.: -117
Sulfur, wt %: 0.0457
Viscosity at 20° C., cst: 2.14
Viscosity at 40° C., cst: 1.51
Viscosity at 50° C., cst: 1.3
Viscosity at 100° C., cst: 0.74
Viscosity at 150° C., cst: 0.5
Mercaptan sulfur, ppm: 2.6
Nitrogen, ppm: 5.7
Heat of combustion, net, btu/lb: 18,457
Paraffins, vol %: 16.81
Naphthenes, vol %: 65.16
Aromatics, vol %: 18.83
Freeze point, °F.: -102.1
Smoke point, mm: 17.1
Naphthalenes, vol %: 2
Cetane index: 40
Cloud point, °F.: -110
Aniline point, °F.: 121.4

Diesel

TBP cut point, °F.: 480-650
Yield, vol %: 17.4
Gravity, °API: 32.3
Specific gravity, 60° F.: 0.8639
Carbon, wt %: 86.62
Hydrogen, wt %: 13.12
Pour point, °F.: -53
Neutralization number (TAN), mg/g: 0.92
Sulfur, wt %: 0.1978
Viscosity at 20° C., cst: 8.49
Viscosity at 40° C., cst: 4.62
Viscosity at 50° C., cst: 3.62
Viscosity at 100° C., cst: 1.55
Viscosity at 150° C., cst: 0.92
Nitrogen, ppm: 88.1
Paraffins, vol %: 35.28
Naphthenes, vol %: 39.97
Freeze point, °F.: -31.8
Cetane index: 50
Cloud point, °F.: -42
Aniline point, °F.: 148.3

Vacuum gas oil

TBP cut point, °F.: 650-1,000
Yield, vol %: 30.52
Gravity, °API: 22.51
Specific gravity, 60° F.: 0.9188
Carbon, wt %: 86.83
Hydrogen, wt %: 12.52
Pour point, °F.: 75
Neutralization number (TAN), mg/g: 0.72
Sulfur, wt %: 0.4818
Viscosity at 20° C., cst: 226.28
Viscosity at 40° C., cst: 64.17
Viscosity at 50° C., cst: 39.05
Viscosity at 100° C., cst: 7.37
Viscosity at 150° C., cst: 2.92
Nitrogen, ppm: 1,178
Conradson carbon residue, wt %: 0.28
Nickel, ppm: 0.1
Paraffins, vol %: 20.73
Naphthenes, vol %: 37.99
Cetane index: 51
Aniline point, °F.: 185.2

Vacuum residue

TBP cut point, °F.: 1,000+
Yield, vol %: 19.83
Gravity, °API: 8.7
Specific gravity, 60° F.: 1.0093
Pour point, °F.: 89
Neutralization number (TAN), mg/g: 0.81
Sulfur, wt %: 0.9548
Viscosity at 20° C., cst: 22,405,431.55
Viscosity at 40° C., cst: 633,632.61
Viscosity at 50° C., cst: 152,603.43
Viscosity at 100° C., cst: 1,243.71
Viscosity at 150° C., cst: 93.12
Nitrogen, ppm: 6,705.6
Conradson carbon residue, wt %: 18.94
n-Heptane insolubles, wt %: 0.2
Nickel, ppm: 61.7
Vanadium, ppm: 22.8
Cetane index: 34

CORRECTION: Nelson-Farrar cost indexes

The January 2005 column in the May 1, 2006, Nelson-Farrar cost indexes (OGJ, May 1, 2006, p. 86) actually contained data for January 2004. The correct data appear in the table below.

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