II. ENVIRONMENTAL IMPACTS AND RISKS EVALUATION OF OFFSHORE DRILLING
_____________________________________________________________________________
60
Compared to the other sections of the well, section 8 ½” has the highest score in human toxicity
(Tab. 8) with 2.23E+05 [kg 1,4-DB eq] and also in ionizing radiation even with a small score of
2 mm section [1.55E-03 DALYs ].
1.01E-03
1.55E-03
3.85E-04
6.11E-04
3.72E-04
1.46E+05
1.45E+05
1.86E+05
7.22E+04
2.23E+05
0.00E+00
2.00E-04
4.00E-04
6.00E-04
8.00E-04
1.00E-03
1.20E-03
1.40E-03
1.60E-03
1.80E-03
Section 36"
Section 26"
Section 17 1/2"
Section 12 1/4"
Section 8 1/2"
Ionising
Radiation
DALY
0.00E+00
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
Human
Toxicity
Kg
1,4-DB
eq
Ionising radiation
Human toxicity 20a
Figure 23: Contribution scores of well sections in Human health risk
Table 8: Contribution scores of well sections in Human toxicity and Ionising radiation
II.3.4 Main contribution of life cycle processes on Human Health risk
The process tree of the system life cycle obtained by the SIMAPRO software made it possible to
identify the processes that have the largest share of high scores (Fig. 23). Thus, for Human
Health category, the majority impact for section 8 ½“, is mainly due to the large amount of diesel
used for technical reasons, with a score of 1.91E5 DALY. For section 12 ¼“ and 17 ½”, there is
also the role of diesel that contributes to the score increase, followed by organic chemicals and
Barite. For the 26” section, both diesel and organic chemicals contribute to the total human
health score. For the 26” section, both diesel and organic chemicals contribute to the total human
health score. For Section 36″, the role of Barite is found with a score of 0.08255 Daly in addition
to that of Soda with 0.13 Daly. These two chemical additives contribute most to the total score in
the human health category, in particular human toxicity.
Catégorie de
dommages
Unité
Section
36"
Section 26"
Section 17
1/2"
Section 12
1/4"
Section 8
1/2"
Human health
DALY
7.22E+04
1.46E+05
1.45E+05
1.86E+05
2.23E+05
Human toxicity
kg 1,4-DB eq 7.22E+04 1.46E+05
1.45E+05
1.86E+05
2.23E+05
Ionising radiation DALYs
1.01E-03
3.72E-04
6.11E-04
3.85E-04
1.55E-03
_____________________________________________________________________________
60
Compared to the other sections of the well, section 8 ½” has the highest score in human toxicity
(Tab. 8) with 2.23E+05 [kg 1,4-DB eq] and also in ionizing radiation even with a small score of
2 mm section [1.55E-03 DALYs ].
1.01E-03
1.55E-03
3.85E-04
6.11E-04
3.72E-04
1.46E+05
1.45E+05
1.86E+05
7.22E+04
2.23E+05
0.00E+00
2.00E-04
4.00E-04
6.00E-04
8.00E-04
1.00E-03
1.20E-03
1.40E-03
1.60E-03
1.80E-03
Section 36"
Section 26"
Section 17 1/2"
Section 12 1/4"
Section 8 1/2"
Ionising
Radiation
DALY
0.00E+00
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
Human
Toxicity
Kg
1,4-DB
eq
Ionising radiation
Human toxicity 20a
Figure 23: Contribution scores of well sections in Human health risk
Table 8: Contribution scores of well sections in Human toxicity and Ionising radiation
II.3.4 Main contribution of life cycle processes on Human Health risk
The process tree of the system life cycle obtained by the SIMAPRO software made it possible to
identify the processes that have the largest share of high scores (Fig. 23). Thus, for Human
Health category, the majority impact for section 8 ½“, is mainly due to the large amount of diesel
used for technical reasons, with a score of 1.91E5 DALY. For section 12 ¼“ and 17 ½”, there is
also the role of diesel that contributes to the score increase, followed by organic chemicals and
Barite. For the 26” section, both diesel and organic chemicals contribute to the total human
health score. For the 26” section, both diesel and organic chemicals contribute to the total human
health score. For Section 36″, the role of Barite is found with a score of 0.08255 Daly in addition
to that of Soda with 0.13 Daly. These two chemical additives contribute most to the total score in
the human health category, in particular human toxicity.
Catégorie de
dommages
Unité
Section
36"
Section 26"
Section 17
1/2"
Section 12
1/4"
Section 8
1/2"
Human health
DALY
7.22E+04
1.46E+05
1.45E+05
1.86E+05
2.23E+05
Human toxicity
kg 1,4-DB eq 7.22E+04 1.46E+05
1.45E+05
1.86E+05
2.23E+05
Ionising radiation DALYs
1.01E-03
3.72E-04
6.11E-04
3.85E-04
1.55E-03