Based on a sample taken Mar. 2, 2018, Equinor ASA (formerly Statoil ASA) on June 11 issued an updated commercial assay of Troll Blend crude to better represent the quality of this blend to its customers (OGJ, May 2, 2011, p. 106; Jan. 25, 2010, p. 48).
Troll field lies in the northern part of the North Sea, about 65 km west of Kollsnes, near Bergen, and comprises the main Troll Øst and Troll Vest structures in blocks 31/2, 31/3, 31/5, and 31/6. Block 31/2 contains 32% of Troll field’s reserves, while the remaining 68% lies in the three other blocks. Troll B, a floating process and accommodation platform with concrete hull, and Troll C, a floating process and accommodation platform with a steel hull, produce from thin oil-bearing layers in the Troll Vest reservoir.
Located about 100 km west of Bergen and 50 km from Oseberg field’s center, Troll B—a floating concrete accommodation and production platform—began producing oil in September 1995 from giant Troll field, which lies on the Norwegian Continental Shelf in 300-340 m of water. Photo from Equinor ASA by Øyvind Hagen.
Gas from Troll Øst and Troll Vest is transported through three multiphase pipelines to the gas processing plant at Kollsnes, where condensate is separated from gas and transported by pipeline to the Mongstad terminal. Dry gas is transported in Zeepipe II A and II B to Zeebrugge in Belgium, with oil from Troll B and Troll C transported in the Troll Oil Pipelines I and II, respectively, to the oil terminal at Mongstad.
Troll production comes from Late Jurassic Sognefjord and Middle Jurassic Fensfjord sandstone encountered 1,300-1,400 m below sea level.
In 2017, the field produced an average 783,000 boe/d of oil, gas, and condensate, of which 81% was gas, according to the Norwegian Petroleum Directorate
Equinor Energy AS, operator, holds a 30.58% interest. Other interests are Petoro AS, 56%; Norske Shell AS, 8.10%; Total E&P Norge AS, 3.69%; and ConocoPhillips Scandinavia AS, 1.62%.
Whole crude
Density at 15° C., kg/l.: 0.847
API gravity at 60/60° F.: 35.4
UOP K factor: 11.9
Total sulfur, wt %: 0.176
Total nitrogen, ppm: 690
Basic nitrogen, ppm: 189
Total acid no., mg KOH/g: 0.69
Reid vapor pressure, psi: 5.7
Vis. at 20° C., cst: 5.51
Vis. at 40° C., cst: 3.39
Vis. at 50° C., cst: 2.76
Paraffins, wt %: 36.6
Naphthenes, wt %: 34.8
Aromatics, wt %: 28.9
Pour point, °C.: -30
Wax, wt %: 4.2
Micro carbon residue, wt %: 1.2
Rams. carbon residue, wt %: 1.1
Vanadium, ppm (wt): 0.5
Nickel, ppm (wt): 0.7
Methane + ethane, wt %: 0.07
Propane, wt %: 0.36
iso-Butane, wt %: 0.32
n-Butane, wt %: 0.79
iso-Pentane, wt %: 0.76
n-Pentane, wt %: 1.00
Cyclopentane, wt %: 0.18
C6 paraffins, wt %: 2.27
C6 naphthenes, wt %: 2.33
Benzene, wt %: 0.42
C7 paraffins, wt %: 2.01
C7 naphthenes, wt %: 3.50
Toulene, wt %: 1.02
Atmospheric distillation
Pentanes to 65° C.
Yield on crude, wt %: 3.1
Yield on crude, vol %: 4.1
Cumulative yield, wt %: 4.7
Density at 15° C., kg/l.: 0.647
API gravity at 60/60° F.: 87.3
Mercaptan sulfur, ppm: 0.1
RON (clear): 78.6
MON (clear): 77.7
Paraffins, wt %: 94.3
Naphthenes, wt %: 5.7
Hydrogen, wt %: 16.5
65 - 100° C.
Yield on crude, wt %: 6.7
Yield on crude, vol %: 7.7
Cumulative yield, wt %: 11.3
Density at 15° C., kg/l.: 0.730
API gravity at 60/60° F.: 62.4
Mercaptan sulfur, ppm: 0.4
RON (clear): 63.8
MON (clear): 60.9
Paraffins, wt %: 46.4
Naphthenes, wt %: 47.4
Aromatics, wt %: 6.2
Hydrogen, wt %: 14.8
100 - 150° C.
Yield on crude, wt %: 11.1
Yield on crude, vol %: 12.1
Cumulative yield, wt %: 22.4
Density at 15° C., kg/l.: 0.775
API gravity at 60/60° F.: 51.0
UOP K factor: 11.5
Sulfur, ppm: 0.002
Mercaptan sulfur, ppm: 0.6
RON (clear): 66.2
MON (clear): 62.6
Paraffins, wt %: 33.4
Naphthenes, wt %: 42.0
Aromatics, wt %: 24.6
Aniline point, °C.: 43.4
Hydrogen, wt %: 13.6
150 - 200° C.
Yield on crude, wt %: 8.8
Yield on crude, vol %: 9.3
Cumulative yield, wt %: 31.3
Density at 15° C., kg/l.: 0.803
API gravity at 60/60° F.: 44.6
UOP K factor: 11.6
Sulfur, ppm: 0.010
Mercaptan sulfur, ppm: 0.6
Total acid no., mg KOH/g: 0.01
Vis. at 20° C., cst: 1.28
Vis. at 40° C., cst: 0.96
RON (clear): 44.0
MON (clear): 39.7
Paraffins, wt %: 40.2
Naphthenes, wt %: 36.6
Aromatics, wt %: 23.2
Freeze point, °C.: -64
Smoke point, mm: 22
Cetane index: 32
Naphthalenes, vol %: 0.4
Aniline point, °C.: 46.7
Hydrogen, wt %: 13.7
200 - 250° C.
Yield on crude, wt %: 8.9
Yield on crude, vol %: 9.0
Cumulative yield, wt %: 40.2
Density at 15° C., kg/l.: 0.837
API gravity at 60/60° F.: 37.4
UOP K factor: 11.5
Sulfur, ppm: 0.027
Mercaptan sulfur, ppm: 0.6
Total nitrogen, ppm: 2
Basic nitrogen, ppm: 0.335
Total acid no., mg KOH/g: 0.04
Vis. at 40° C., cst: 1.70
Vis. at 50° C., cst: 1.46
Pour point, °C.: -54
Cloud point, °C.: -53
Freeze point, °C.: -50
Smoke point, mm: 18
Cetane index: 38
Naphthalenes, vol %: 4.3
Aniline point, °C.: 55.4
Hydrogen, wt %: 13.3
250 - 300° C.
Yield on crude, wt %: 10.8
Yield on crude, vol %: 10.6
Cumulative yield, wt %: 51.0
Density at 15° C., kg/l.: 0.863
API gravity at 60/60° F.: 32.5
UOP K factor: 11.5
Sulfur, ppm: 0.064
Mercaptan sulfur, ppm: 0.4
Total nitrogen, ppm: 5
Basic nitrogen, ppm: 2.578
Total acid no., mg KOH/g: 0.15
Vis. at 40° C., cst: 3.12
Vis. at 50° C., cst: 2.55
Pour point, °C.: -35
Cloud point, °C.: -35
Freeze point, °C.: -28
Smoke point, mm: 15
Cetane index: 44
Naphthalenes, vol %: 9.7
Aniline point, °C.: 61.7
Hydrogen, wt %: 12.9
300 - 350° C.
Yield on crude, wt %: 11.1
Yield on crude, vol %: 10.6
Cumulative yield, wt %: 62.1
Density at 15° C., kg/l.: 0.885
API gravity at 60/60° F.: 28.4
UOP K factor: 11.6
Sulfur, ppm: 0.163
Total nitrogen, ppm: 47
Basic nitrogen, ppm: 22.940
Total acid no., mg KOH/g: 0.60
Vis. at 40° C., cst: 6.81
Vis. at 50° C., cst: 5.20
Pour point, °C.: -10
Cloud point, °C.: -10
Cetane index: 49
Naphthalenes, vol %: 14.2
Aniline point, °C.: 67.0
Hydrogen, wt %: 12.7
350 - 370° C.
Yield on crude, wt %: 3.3
Yield on crude, vol %: 3.1
Cumulative yield, wt %: 65.3
Density at 15° C., kg/l.: 0.900
API gravity at 60/60° F.: 25.6
UOP K factor: 11.6
Sulfur, ppm: 0.239
Total nitrogen, ppm: 182
Basic nitrogen, ppm: 72.240
Total acid no., mg KOH/g: 1.14
Vis. at 40° C., cst: 15.4
Vis. at 50° C., cst: 10.80
Pour point, °C.: 6
Cetane index: 52
Aniline point, °C.: 73.2
Hydrogen, wt %: 12.6
370° + C.
Yield on crude, wt %: 34.7
Yield on crude, vol %: 31.2
Cumulative yield, wt %: 100.0
Density at 15° C., kg/l.: 0.938
API gravity at 60/60° F.: 19.3
UOP K factor: 11.9
Sulfur, ppm: 0.403
Total nitrogen, ppm: 1,956
Basic nitrogen, ppm: 531.500
Total acid no., mg KOH/g: 1.38
Vis. at 50° C., cst: 209.00
Vis. at 60° C., cst: 115.0
Vis. at 100° C., cst: 20.90
Pour point, °C.: 32
Wax, wt %: 9.7
C7 asphaltenes, wt %: 0.1
Micro carbon residue, wt %: 3.6
Rams. carbon residue, wt %: 3.1
Vanadium, ppm (wt): 1.5
Nickel, ppm (wt): 2.1
Vacuum distillation
370 - 450° C.
Yield on crude, wt %: 12.1
Yield on crude, vol %: 11.2
Density at 15° C., kg/l.: 0.914
API gravity at 60/60° F.: 23.3
UOP K factor: 11.7
Sulfur, ppm: 0.269
Total nitrogen, ppm: 500
Basic nitrogen, ppm: 158.600
Total acid no., mg KOH/g: 1.33
Vis. at 50° C., cst: 31.00
Vis. at 60° C., cst: 20.8
Vis. at 100° C., cst: 6.26
Pour point, °C.: 24
Aniline point, °C.: 82.8
Hydrogen, wt %: 12.6
Wax, wt %: 11.0
450 - 500° C.
Yield on crude, wt %: 6.9
Yield on crude, vol %: 6.3
Density at 15° C., kg/l.: 0.923
API gravity at 60/60° F.: 21.7
UOP K factor: 12.0
Sulfur, ppm: 0.324
Total nitrogen, ppm: 960
Basic nitrogen, ppm: 263.000
Total acid no., mg KOH/g: 1.55
Vis. at 50° C., cst: 78.10
Vis. at 60° C., cst: 47.9
Vis. at 100° C., cst: 11.40
Pour point, °C.: 39
Aniline point, °C.: 89.8
Hydrogen, wt %: 12.5
Wax, wt %: 11.5
Micro carbon residue, wt %: 0.1
Rams. carbon residue, wt %: 0.1
500 - 550° C.
Yield on crude, wt %: 5.6
Yield on crude, vol %: 5.1
Density at 15° C., kg/l.: 0.936
API gravity at 60/60° F.: 19.6
UOP K factor: 12.0
Sulfur, ppm: 0.406
Total nitrogen, ppm: 1,565
Basic nitrogen, ppm: 396.230
Total acid no., mg KOH/g: 1.69
Vis. at 50° C., cst: 231.00
Vis. at 60° C., cst: 127.0
Vis. at 100° C., cst: 22.60
Pour point, °C.: 47
Aniline point, °C.: 92.2
Hydrogen, wt %: 12.5
Wax, wt %: 10.5
Micro carbon residue, wt %: 1.1
Rams. carbon residue, wt %: 1.1
550° + C.
Yield on crude, wt %: 10.1
Yield on crude, vol %: 8.7
Density at 15° C., kg/l.: 0.980
API gravity at 60/60° F.: 12.8
UOP K factor: 12.0
Sulfur, ppm: 0.620
Total nitrogen, ppm: 4,585
Basic nitrogen, ppm: 1,233.900
Total acid no., mg KOH/g: 1.16
Vis. at 100° C., cst: 403.00
Vis. at 130° C., cst: 90.6
Pour point, °C.: 31
Wax, wt %: 6.4
C7 asphaltenes, wt %: 0.3
Micro carbon residue, wt %: 11.5
Rams. carbon residue, wt %: 9.9
Vanadium, ppm (wt): 5.3
Nickel, ppm (wt): 7.2
