Esso Bass Strait 2020 Jack Up Rig Campaign - Update 2 March 2020 - Seahorse / Tarwhine P&A programme - ExxonMobil
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Campaign Sheet #4 – March 2020 Esso Bass Strait 2020 Jack Up Rig Campaign – Update 2 March 2020 Seahorse / Tarwhine P&A programme Issue Date: March 2020 Page 1 of 6
Campaign Sheet #4 – March 2020 – Seahorse / Tarwhine Campaign
Esso Australia is planning to undertake a number
of offshore activities within the Gippsland Basin
off the Victorian coastline collectively called the
2020 Jack Up Rig Campaign as advised in 2Q19.
This programme includes:
Drilling
o Two subsea gas production wells in the
West Barracouta field (BTW)
o Two subsea gas production wells in the
Kipper field
Well Plug and Abandonment (P&A)
o Subsea wells, Seahorse -1 and Tarwhine
– 1 (SHA/TWA)
o Whiting platform Noble Tom Prosser Jack-Up Drilling Rig (Image courtesy of
Noble Corporation)
o Mulloway / Whiptail
o Perch / Dolphin
The Tom Prosser does not have any propulsion
There will be no seismic activity as part of this capability and will be towed into position, then
campaign. the legs lowered onto the seabed and the rig
Drilling activities began at Barracouta (BTA) in elevated above the sea surface.
January 2020 using the jack-up drilling rig “Tom Following the BTW drilling activities the Tom
Prosser”, which is known as a jack-up offshore Prosser will move to the Whiting platform and
drilling rig (JUR). The Tom Prosser was built in then to Seahorse / Tarwhine to begin the plug
2014 and operates to the latest international and abandonment programme of the wells.
safety and environmental standards. The drilling
rig will be supported by up to three support This information sheet provides additional
vessels. information on the Seahorse/Tarwhine Plug and
Abandonment (SHA/TWA P&A) programme.
Issue Date: March 2020 Page 2 of 6
Campaign Sheet #4 – March 2020 – Seahorse / Tarwhine Campaign
Activity Description Impacts and Risks
Well Abandonment Impacts and risks from the JUR activities have
been outlined in the campaign sheet sent out in
The SHA subsea well was plugged with solids in
2Q19.
2014 and the wellbore was circulated to replace
its contents with inhibited water.
The TWA chemical and hydraulic cores of the
umbilical were also flushed with inhibited
seawater prior to severing it at the BTA platform
end in 2018.
Once the JUR is positioned over the wellhead, the
tree cap will be removed and barrier testing will
be completed.
For all wells, a Blowout Preventer (BOP) will be
used to prevent the release of hydrocarbons
during the plugging of the wells. Tubing and
associated instruments and control valves will be
removed, and permanent cement plugs / barriers
installed to provide multiple physical barriers to
prevent the release of any hydrocarbons that
remain in the reservoir.
The well casing and conductors will be cut at a
depth of ~ 3 m below the mudline and removed
and the severed wellhead will be retrieved.
Activity Location
The Seahorse and Tarwhine wells are located 15
and 23 km off the Gippsland coastline
respectively, south of Lakes Entrance in a water
depth of ~43m.
The BTA platform lies in-between the two subsea
wells, ~11km from SHA and ~17km from TWA.
SHA activities will occur within the Bass Strait
Area To Be Avoided (ATBA) for commercial
shipping while TWA lies immediately outside the
ATBA. Neither the existing subsea facilities nor
the existing routes of the flexible flowline and
control umbilical from BTA to SHA/TWA are
located within any established or proposed
Commonwealth or State Marine Protected Areas,
Critical Habitats or Threatened Ecological
Communities. It is recognised that the activities
will overlap with existing fisheries.
Issue Date: March 2020 Page 3 of 6
Campaign Sheet #4 – March 2020 – Seahorse / Tarwhine Campaign
Well Locations Licence Area Latitude/Longitude Activity Type Water depth (m)
Kipper Subsea Facility 38°10' 53" S
VIC/L25 Drilling 95
(KPA-A1, KPA-A3) 148° 35' 35” E
West Barracouta Drill Centres 38° 19’ 06” S
VIC/L1 Drilling 46
(BTW-W1, BTW-W2) 147° 36’ 53” E
38° 24’ 12” S
Tarwhine (TWA-1) VIC/L1 P&A 42
147° 31’ 46” E
38° 11’ 42” S
Seahorse (SHA-1) VIC/L18 P&A 42
147° 40’ 27” E
38° 14’ 29” S
Whiting platform (WTA) (5 wells) VIC/L2 P&A 54
147° 72’ 20” E
Whiptail &
Mulloway
Esso Bass Strait 2020 Jack Up Rig Campaign Activity Locations as circled
Issue Date: March 2020 Page 4 of 6
Campaign Sheet #4 – March 2020 – Seahorse / Tarwhine Campaign
Activity Timing The timing of the activity may vary and is
The following shows an indicative campaign contingent on regulatory approvals, joint venture
timetable only. approvals, and weather and rig/vessel schedules.
Activities will be conducted 24 hours per day,
seven days per week. It is expected to take ~30
days to plug and abandon each well.
West Barracouta Drilling
January 2020
Commences
Whiting Plug & Abandonment
April 2020
Commences
Seahorse / Tarwhine Plug &
July 2020 Abandonment Commences
September 2020 Kipper Drilling Commences
Mulloway / Whiptail Plug & Abandonment
December 2020 Commences (to be confirmed)
Perch / Dolphin Plug & Abandonment
March 2021 Commences (to be confirmed)
Indicative Jack Up Rig Campaign Activity Timeline
Issue Date: March 2020 Page 5 of 6
Campaign Sheet #4 – March 2020 – Seahorse / Tarwhine Campaign
Petroleum Safety Zones (ALARP) and meet Esso Australia’s acceptability
criteria.
Seahorse / Tarwhine is located within existing
500m Petroleum Safety Zones (PSZ). The exact Consultation
location of the drill rig while at location will be
Esso Australia is committed to engaging with the
communicated to other marine vessels via a
communities where we operate and helping our
Notice to Mariners issued by the Australian
stakeholders to understand our business.
Hydrographic Service (AHS) and AUSCOAST
warnings issued by AMSA. Esso has been consulting with stakeholders
potentially affected by this campaign through a
Interaction with Commercial Fishing
number of different channels.
Seahorse / Tarwhine is located within existing
While some community consultations have
designated Commonwealth and State fisheries
occurred, Esso welcomes the opportunity for
that may be used by commercial fishers. The
more face-to-face meetings and will continue to
500m PSZ will be communicated to South East
keep interested stakeholders informed of the
Trawl Fishing Industry Association (SETFIA) as it
proposed activities throughout the planning
is a legal requirement that the area should be
phase and into operational phase.
avoided during the P&A Activities.
We will address questions and consider feedback
Environment Plans
from stakeholders throughout this campaign.
Under the Offshore Petroleum and Greenhouse
If you have any specific questions or feedback
Gas Storage Act 2006, before any petroleum
about any of these activities please contact Esso
related activities in Commonwealth waters can
at consultation@exxonmobil.com or call 03 9261
commence, an Environment Plan (EP) must be
0788.
accepted by the National Offshore Petroleum
Safety and Environmental Management
Authority (NOPSEMA).
In the course of preparing an EP, Esso Australia
must consult with relevant authorities, persons
and organisations whose functions, interests or
activities may be affected by the proposed
activities (i.e. a relevant person) and provide the
opportunity for any issues or concerns to be
raised.
Separate Environment Plans (EPs) are being
developed for these different activities, however,
to improve efficiencies for stakeholders, a single
consultation process is being undertaken.
The EP is a comprehensive document that
describes the existing environment, including
stakeholders, and how Esso Australia will
undertake the activities to avoid, minimise or
manage potential environmental impacts to the
“As Low As Reasonable Practicable” standard
Issue Date: March 2020 Page 6 of 6You can also read
