Based on a sample taken Apr. 3, 2014, BP PLC has published an updated assay of Kissanje Blend crude oil from the Kizomba B deepwater project in Block 15 offshore Angola, which began production in July 2005 (OGJ Online, July 18, 2005).
The latest assay shows Kissanje has risen to 31.3° API gravity from an initial 29.6° API gravity as published in a 2006 assay issued by ExxonMobil Corp.-subsidiary Esso Exploration Angola (Block 15) Ltd., which operates Kizomba B under a concession agreement with Sonangol, Angola's state oil company (OGJ, June 19, 2006, p. 50).
The $3.5 billion Kizomba B project, with an estimated 1 billion bbl of oil in Kissanje and Dikanza oil fields, lies in 3,280 ft of water about 215 miles northwest of Luanda and includes a floating production, storage, and offloading vessel with 2.2 million bbl storage.
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%.
Whole crude
API gravity at 60/60° F.: 31.3
Density at 15° C., kg/l.: 0.8687
Total sulfur, wt %: 0.40
Mercaptan sulfur, wt %: 0.0002
Vis. at 20° C., cst: 17.20
Vis. at 30° C., cst: 12.10
Vis. at 40° C., cst: 8.80
Vis. at 50° C., cst: 6.69
Vis. at 60° C., cst: 5.24
Vis. at 100° C., cst: 2.42
Pour point, °C.: -33
Wax, wt %: 5.0
Total nitrogen, ppm (wt): 1,910.00
Basic nitrogen, ppm (wt): 567
Acidity, mg KOH/g: 0.402
Carbon residue, wt %: 3.780
Asphaltenes, wt %: 0.7120
Vanadium, ppm (wt): 5.4
Nickel, ppm (wt): 16.0
Iron, ppm (wt): 5.2
C2, wt %: 0.02
C3, wt %: 0.33
i-C4, wt %: 0.23
n-C4, wt %: 0.85
C5 to 95° C.
Yield on crude, wt %: 5.650
Yield on crude, vol %: 7.13
Density at 15° C., kg/l.: 0.6859
Mercaptan sulfur, wt %: 0.0003
Total nitrogen, ppm (wt): 0.05
Acidity, mg KOH/g: 0.0393
Research octane no.: 70.3
Paraffins, wt %: 68.2
n-Paraffins, wt %: 27.8
Naphthenes, wt %: 30.8
Aromatics, wt %: 1.0
95-175° C.
Yield on crude, wt %: 11.322
Yield on crude, vol %: 12.77
Density at 15° C., kg/l.: 0.7691
Total sulfur, wt %: 0.009
Mercaptan sulfur, wt %: 0.0004
Total nitrogen, wt (ppm): 0.57
Acidity, mg KOH/g: 0.0698
Research octane no.: 38.2
Paraffins, wt %: 37.2
n-Paraffins, wt %: 13.3
Naphthenes, wt %: 49.2
Aromatics, wt %: 13.5
C5 to 149° C.
Yield on crude, wt %: 13.111
Yield on crude, vol %: 15.65
Density at 15° C., kg/l.: 0.7263
Total sulfur, wt %: 0.004
Mercaptan sulfur, wt %: 0.0004
Total nitrogen, wt (ppm): 0.22
Acidity, mg KOH/g: 0.0331
Research octane no.: 64.8
Paraffins, wt %: 50.1
n-Paraffins, wt %: 19.9
Naphthenes, wt %: 43.1
Aromatics, wt %: 6.8
149-232° C.
Yield on crude, wt %: 12.497
Yield on crude, vol %: 13.46
Density at 15° C., kg/l.: 0.8055
Total sulfur, wt %: 0.030
Mercaptan sulfur, wt %: 0.0003
Vis. at 40° C., cst: 1.14
Vis. at 60° C., cst: 0.90
Total nitrogen, wt (ppm): 2.56
Acidity, mg KOH/g: 0.3
Smoke point, mm: 22
Freezing point, °C.: -68
Cetane index (ASTM D4737-90): 38.5
Refractive index at 70° C.: 1.4245
Aromatics, vol %: 17.57
Naphthalenes, vol %: 0.9
232-342° C.
Yield on crude, wt %: 19.694
Yield on crude, vol %: 19.98
Density at 15° C., kg/l.: 0.8549
Total sulfur, wt %: 0.164
Mercaptan sulfur, wt %: 0.0003
Vis. at 50° C., cst: 3.04
Vis. at 100° C., cst: 1.38
Cloud point, °C.: -21
Pour point, °C.: -25
Wax, wt %: 1.7
Total nitrogen, ppm (wt): 70.00
Basic nitrogen, wt %: 41
Acidity, mg KOH/g: 0.6640
Smoke point, mm: 16
Freezing point, °C.: -18
Cetane index (ASTM D4737-90): 50.3
Refractive index at 70° C.: 1.4552
Aromatics, vol %: 23.93
Aromatics, wt %: 27.2
Naphthalenes, vol %: 8.0
342-369° C.
Yield on crude, wt %: 4.614
Yield on crude, vol %: 4.52
Density at 15° C., kg/l.: 0.8854
Total sulfur, wt %: 0.385
Vis. at 50° C., cst: 8.96
Vis. at 100° C., cst: 2.88
Cloud point, °C.: 4
Pour point, °C.: 2
Wax, wt %: 6.5
Total nitrogen, ppm (wt): 409.00
Basic nitrogen, wt %: 156
Acidity, mg KOH/g: 0.7410
Aniline point, °C.: 75.6
Cetane index (ASTM D4737-90): 58.0
Refractive index at 70° C.: 1.4719
369-509° C.
Yield on crude, wt %: 22.574
Yield on crude, vol %: 21.37
Density at 15° C., kg/l.: 0.9160
Total sulfur, wt %: 0.456
Vis. at 60° C., cst: 25.30
Vis. at 100° C., cst: 7.45
Pour point, °C.: 25
Wax, wt %: 7.8
Total nitrogen, ppm (wt): 1,200.00
Basic nitrogen, wt %: 445
Acidity, mg KOH/g: 0.4930
Carbon residue, wt %: 0.104
Asphaltenes wt %: 0.0059
Aniline point, °C.: 84.5
Refractive index at 70° C.: 1.4882
509-550° C.
Yield on crude, wt %: 4.713
Yield on crude, vol %: 4.35
Density at 15° C., kg/l.: 0.9404
Total sulfur, wt %: 0.650
Vis. at 60° C., cst: 171.00
Vis. at 100° C., cst: 28.50
Wax, wt %: 8.9
Total nitrogen, ppm (wt): 2,830.00
Basic nitrogen, wt %: 859
Acidity, mg KOH/g: 0.2820
Carbon residue, wt %: 1.780
Asphaltenes, wt %: 0.1670
Aniline point, °C.: 91.7
Refractive index at 70° C.: 1.5057
550-585° C.
Yield on crude, wt %: 3.815
Yield on crude, vol %: 3.48
Density at 15° C., kg/l.: 0.9509
Total sulfur, wt %: 0.7270
Vis. at 60° C., cst: 435.00
Vis. at 100° C., cst: 55.00
Wax, wt %: 9.7
Total nitrogen, ppm (wt): 3,740.00
Basic nitrogen, wt %: 1,070
Acidity, mg KOH/g: 0.2440
Carbon residue, wt %: 3.8
Asphaltenes, wt %: 0.4530
Aniline point, °C.: 93.5
