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Produced water – Quantity (m 3 )
2006 8,774.7
2006
2005
2005
2004
2004
950.7
6,634.9
1,237.0
1,582.3
1,288.5
2,000 4,000 6,000 8,000
10,000
52/5A 48/29A
Produced water – Quality (1)
2006 14.25
2006
2006
2005
2005
2005
2004
2004
2004
5 10 15 20 25 30 35 40
31.0
30.0
24.7
26.89
40.0
11.8
27.83
40.0
Total oil produced water (tonnes) (2)
2006 0.13215
2006
2006
2006
2005
2005
2004
2004
1.02
0.03025
0.09
0.16531
0.03409
0.015
0.0209
0.300 0.500 0.700 0.900 1.100
52/5A 48/29A DTI standard 52/5A DTI standard 48/29A
(2)
DTI regulation came into effect in 2006.
52/5A 48/29A DTI permitted allowances (individually for both installations)
(1)
in 2005, the quality standard changed from 40 mg/kg to 30 mg/l.
Tullow recognises that climate change is
a significant global issue and is casually
linked to hydrocarbon consumption. While the
industry has a responsibility to take collective
action, we are also actively engaged in
finding ways to reduce our impact on the
environment. Tullow’s IMS incorporates and
underpins our environmental commitment,
under ISO 14001 certification criteria, to
minimise pollution. IS0 14001 certification
requires Tullow to commit to avoiding
spills as well as demonstrate continuous
improvement in environmental performance.
A standardised ESIA tool, used by country
and business unit managers throughout
the Group, includes, as a matter of course,
emissions control in the design phase of all
major projects and developments. Above all,
Tullow aims to explore and produce oil
and gas efficiently and minimise the
environmental impact of its operations
using best practices.
A current project that highlights Tullow’s
processes in relation to climate change is
the large Kudu gas field offshore Namibia,
which will be used to run an onshore power
station. The design of these facilities will
meet climate change environmental
challenges while producing electricity
efficiently. Innovative thinking can also
be applied to existing facilities and a good
example of this is the use of wind turbines
to generate power on the Horne & Wren
satellite installation in the SNS, the first
stand-alone wind generation project of its
kind in the UK. These wind turbines provide
enough ‘clean’ energy to power key systems.
They also remove the requirement for diesel
storage for generators, the associated
emissions that result from their utilisation
and as a consequence there has also been
a significant reduction in the number of
planned maintenance visits.
Discharges
Under the Offshore Petroleum Activities (Oil
Pollution Prevention and Control) Regulations
2005, Tullow’s two discharging installations
in the SNS (Hewett 52/5A and Hewett 48/29A)
are regulated in relation to the quantity and
quality of produced water, and the total oil
discharged in produced water. In 2006, total
oil discharged regulations came into effect,
and these are considered the new benchmark
for produced water discharges. Standards
are set by the DTI.
Regulations covering quantity and quality of
produced water were complied with for 2004
and 2005, by both installations. In 2006, all
installations complied with the total oil in
produced water standard set out in the
relevant permits. In relation to the 30mg/l
quality standard Hewett 48/29A had an
isolated incident in December, which
meant that this installation exceeded the
DTI standard. However, this was not of
immediate concern against a high level
of compliance and the background to this
incident is being investigated.
Under the new total oil discharged
regulations, the two installations are holders
of permits which allow a discharge of total oil
in produced water of 0.09 tonnes for Hewett
48/29A and 1.02 tonnes for the Hewett 52/5A.
While this number was not applicable for the
years prior to 2006, Tullow can demonstrate
that since 2004 these facilities discharged
less than the regulated amount, and to put
these permitted allowances in context some
North Sea platforms have allowances to
discharge some 200 tonnes of total oil in
produced water.
Tullow Oil plc Corporate and Social Responsibility Report 2006 23