Environment Report 2018

ENVIRONMENT REPORT 2018

4.1 Dispersed Oil in Produced Water The mean concentration across industry of oil discharged to sea in produced water increased by over 13 per cent from 13.3 mg/l in 2016 to 15.3 mg/l in 2017. Despite the increase, the average remains below OSPAR’s annual recommended limit of 30 mg/l. Average oil-in-water concentrations for individual operators are the result of several factors. Those operators with higher values may have more gas production or more challenging reservoirs, for example. The operator benchmarking illustrated in Figure 21 below therefore provides a general picture of industry dispersed oil-in-water performance, but cannot be interpreted as some operators performing better than others.

Oil OIW (mg/l)

Gas OIW (mg/l)

Condensate OIW (mg/l)

70

Figure 21: Concentration of Dispersed Oil in Produced Water per Operator by Hydrocarbon Type, 2017 Industry Average 2016 Industry Average 2017

60

50

Oil OIW (mg/l)

Gas OIW (mg/l)

Condensate OIW (mg/l)

70

Industry Average 2016

Industry Average 2017

40

60

30

50

20

40

10

30

Oil in Produced Water (mg/l)

0

A B C D E F G H I

J K L M N O P Q R S T U V W X Y Z AA

20

10

Oil in Produced Water (mg/l)

0

A B C D E F G H I

J K L M N O P Q R S T U V W X Y Z AA

Data excludes one outlier

Source: EEMS October 2018

Data excludes one outlier

Source: EEMS October 2018

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