II. ENVIRONMENTAL IMPACTS AND RISKS EVALUATION OF OFFSHORE DRILLING
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Table 5: Extract from the matrix of emissions and extractions of well sections and drilling waste
treatments life cycle
Drill Waste Treatment Options
Resources
Unit
Sieving+
Centrifugation
Stabilization/Solidification
Thermal
desorption
Water
kg
5,11E+06
3,77E+05
2,33E+06
Energy
MJ
1,38E+05
1,13E+07
-1,32E+05
Barite
kg
6,13E+02
1,52E+02
4,35E+01
Bentonite
kg
4,18E+06
9,98E+00
3,78E+00
Carbon
kg
1,30E+04
8,20E+03
-3,14E+04
Natural gas
m
3
1,76E+03
1,41E+04
-6,80E+03
Iron
kg
7,86E+00
1,11E-02
9,61E+01
Emissions to air
CO2
kg
4,75E+05
-4,82E+05
4,64E+05
CO
kg
1,85E+02
-9,23E+02
5,54E+02
CH4
kg
6,58E+02
-6,34E+03
6,20E+02
VOC
kg
2,03E+05
x
x
Emissions to soil
Al
kg
7,60E+04
5,69E+04
7,71E+04
As
kg
2,90E+00
2,17E+00
4,71E-01
Ba
kg
2,29E+05
1,71E+05
1,17E+05
Pb
kg
1,06E+03
7,97E+02
2,06E+03
Ni
kg
4,84E+01
3,62E+01
3,26E+01
Zn
kg
7,26E+03
5,43E+03
2,09E+03
Aromatic Hydrocarbons
kg
3,87E+05
7,99E+04
3,62E+04