Proteus-1 Exploration Well in WA-398-P
06:00 WST on the 19th of July Proteus-1ST1
was drilling ahead in the 6-1/2” hole at a depth of 4583 meters.
Since the last update the 7-5/8” liner was cemented
and pressure tested before running in hole and drilling ahead with
the 6-1/2” drilling assembly.
ConocoPhillips is the operator of the jointly held
WA-314-P, WA-315-P and WA-398-P Browse Basin permits containing
the previously announced Greater Poseidon gas discoveries. Karoon
Gas Australia Ltd holds a 40% equity interest in permit WA-315-P
and WA-398-P, and a 90% interest in permit WA-314-P.
Proteus-1 is the third well in the exploration
program. Proteus-1 is located in permit WA-398-P on a large
tilted fault block approximately 14 kilometers south south east of
the Poseidon-1 discovery well.
The Transocean Legend semi-submersible rig is
drilling the exploration well, which is operated by ConocoPhillips.
Upcoming Well Program
Grace prospect in WA-314-P is the next scheduled
PetroChina and ConocoPhillips enter into agreements for a 20%
7 March 2013 - As part of a larger set of
agreements, including the sale of two separate interests in
Australia and a joint study agreement in China, ConocoPhillips has
agreed to sell to Chinese National Petroleum Corporation (“PetroChina”)
a 20% interest in the Browse Basin joint ventures covering
exploration blocks WA-315-P and WA-398-P which include the
Poseidon gas condensate discovery.
Pursuant to the terms of the joint ventures between
Karoon and ConocoPhillips, Karoon has pre-emptive rights over the
0% interest being sold to PetroChina. This right will lapse at
the beginning of April and Karoon is currently assessing its
position with respect to the pre-emptive rights.
Zephyros-1 Exploration Well in WA-398-P
13 March 2013, at 06:00 hours (WST) today, Karoon
advises that wireline logs were being acquired in the Zephyros-1
well. Since the last update, 108 meters of core was cut and
recovered to surface and the well was drilled to its total
vertical depth of 5372 meters before conducting wireline logging.
Zephyros-1 well penetrated gas bearing Plover Formation sands
similar to that seen at Kronos-1.
Zephyros-1 reservoir sands are good quality, intervals of which
are interpreted to have some of the highest mobility values
(ability to flow gas) recorded from MDT sampling tools in any of
the JV’s Poseidon area wells.
the case of a production test, Zephyros-1 would be expected to
flow at similar, tubing constrained, rates to Kronos-1.
Pressure data through the gas column indicates a possible deep
gas-water contact similar to the interpreted at Kronos-1.
108m of cut core will provide a high quality data set for further
Numerous reservoir fluid and pressure samples were gathered,
allowing the joint venture to further assess the greater Poseidon
resource size and gas composition while also providing information
for use in the estimated well production rates for any development
wells in the future.
Boreas-1 Well test flows at a facility constrained stabilized
rate of 30 million standard cubic feet per day.
October 2012 - Boreas-1 Exploration Well in WA-315-P
A production logging run is being performed as the
final operation of the production testing program at Karoon Gas
Australia Ltd’s Boreas-1 exploration well. Upon completion of
this final operation, the testing string will be removed from the
During flow testing this week, Boreas-1 exploration
well flowed gas to the surface at an equipment constrained maximum
sustained rate of up to 30 MMscf/d through a 40/64 inch choke at a
well head pressure of 3300 psi.
A Condensate-Gas Ratio of 18 bbl/MMscf was measured
at the surface, along with a 16% CO2 content taken from the gas
flow on a volume basis. This condensate/gas ratio is almost
double the rate discovered in the Kronos 1 well.
The flow rates were achieved from a multi-rate flow
test flowed by pressure build up and a bottom hole reservoir fluid
sampling in a perforated interval of 70 meters between 4904 and
4974 meters in the primary target Plover formation.
Based on an analysis of the well test date, Karoon
believes that futre production wells drilled adjacent to the
Boreas-1 location have the potential to flow at commercial rates
in excess of 100MMscf/d.
Kronos-1 - Confirmed equipment constrained maximum sustained
production test flow rate of 26 million standard cubic feet a
day from the Kronos-1 Well
27 May 2010 - At 0600 hrs today, Karoon advises the
production test of the Kronos-1 exploration well was complete and
the testing string was being removed from the well. Since the
last report, testing operation included a multi-rate flow test
followed by a pressure build-up and bottom hole reservoir fluid
The maximum sustained flow rate attained during the
multi-rate test was 26MMscf/d through a 32/64” choke, with a
flowing wellhead pressure of 3900 psia. As with the previously
released clean up flow rates, the flow rates achieved were
equipment constrained. A condensate-Gas Ratio of 9.5bbl/MMscf was
measured at the surface, along with a 10% CO2 content taken from
the gas flow on a volume basis.
Based on an analysis of the well test data, Karoon
believes that future production wells drilled adjacent to the
Kronos-1 location have the potential to flow at commercial rates
in excess of 100 MMscf/d.
Montara Formation testing
3 February 2010 - At 1200 hrs WST today, a drill
stem test of the Montara Formation reservoir over the interval
4714-4721 & 4727-4731mRT was in progress. After reviewing flow
and pressure data, the Joint Venture has elected finish the test
effective immediately. WE will now commence preparations to plug
and abandon the well as previously advised upon the completion of
Karoon believes that it is highly likely that
communication to the Montara reservoir was not established during
perforation procedures. Lack of suitable equipment at the well
site directed at attempting to establish communication to the
Montara reservoir has resulted in the decision to move to commence
drilling in a new location.
The Montara Formation reservoir sands were first
penetrated in the Poseidon-2 well within the Poseidon field.
Petrophysical and mudlog data provides strong indications that
moveable gas exists in the reservoir which will be a serious
target for futher evaluation and eventual production testing in
future appraisal wells to be drilled over the coming months.
Plover B Formation testing
Since the last report the Plover-B DST testing
program over the interval 5039-5060 & 5085-5100mRT was completed.
Gas was produced to surface at a maximum rate of 850scf/d on a 1”
choke. Based on the low permeability measured in the B sand core,
Karoon interprets that higher flow rates are achievable.
Karoon’s interpretation of the restricted flow
resulted in part from completion brine being present in the well,
severely restricting gas flow to surface. Liquids volumes were
not measured due to the low gas rates (gas-liquids separator not
A Plover B gas sample was taken at the surface and
preliminary compositional analysis shows high methane content,
some associated heavier hydrocarbons and low CO2 levels.
Laboratory analysis of preserved gas samples will be used to
further define gas composition and any potential liquids yield of
the reservoir gas. Further analysis of reservoir gas compositions
will be conducted over the course of the appraisal program.
Geological and reservoir simulation modeling by
Karoon of the Poseidon field incorporating the Poseidon-2 Plover-B
core permeability data are considered unlikely to materially
impact the Karoon pre-drill P50 7 TCF Poseidon Contingent Resource
estimates for the Plover reservoirs.
Plover-B Formation Reservoir evaluation
The Poseidon-2 well has met the objective of
testing the extent and quality of reservoirs down dip from the
Poseidon-1 discovery in a thickened Plover Formation interval (as
defined by seismic).
Positioning of the well 6 kilometers from
Poseidon-1 in a down-dip setting was considered risky with respect
to obtaining high gas flows, but information from down-dip
positions on the field is critically important for optimal field
appraisal. The timing of drilling this well in the overall
appraisal program was in part dictated by the permit conditions of
This well also supports Karoon’s view that the A
and C sand intervals have overall better reservoir facies
development than the highly interbedded B sand interval. As such,
reservoir quality and testing results from the B sand at this
location are not considered representative of either of the other
sand intervals A and C in the field, nor is it necessarily
representative of the B reservoir unit over the remaining field
Poseidon-2 appraisal well has:
Discovered a new Montara Formation gas reservoir.
Penetrated the three Plover Formation reservoir units A, B and C
discovered in the Poseidon-1 well, establishing continuity of the
gross sand intervals and intervening shales over a large part of
Conducted Drill String Tests (DST’s) that prove log interpretation
results identifying the presence of movable gas and adequate
reservoir quality in the B reservoirs above the Gas Water Contact
at this location.
Demonstrated that Plover-B core measured permeability at this
down-dip location is sufficient to contribute to overall field gas
Preliminary gas analysis of gas recovered at surface, shows
presence of heavier HC components and low CO2 content.
POSEIDON-1 EXPORATION WELL IN WA-315-P
19 May 2009 - Karoon Gas Australia Ltd advises
that at 06:00 hours (WST) today, preparations are underway to plug
and abandon Poseidon-1 as a significant gas discovery. Wireline
log porosity and pressure measurement data suggests the well is
capable of flowing gas.
The Joint Venture has commenced planning a Poseidon
Field appraisal program. The next well in the current program
will be Kontiki-1.
Since the last report the 5” liner was run and
cemented in the Poseidon-1 well, however there was a mechanical
failure while attempting to retrieve the lining hanger setting
tool. This resulted in the well being irreparably plugged above
planned test intervals making it impossible to carry out the
planned production tests. After successful attempts at recovery
of the tool, the Joint Venture decided to plug and abandon
The Joint Venture has obtained significant
information from Poseidon-1 as outlined below:
well has penetrated a 317m gross gas bearing Plover Formation over
the interval 4795 to 5112mRT with three gross gas bearing sands
totaling 228 m.
Wireline pressure testing of four data points and sampling (MDT
tool) in the lower sand interval shows a gas gradient, indicating
that the reservoir contains gas.
gas water contact has not been penetrated, indicating the
potential for additional gas below the total depth of Poseidon-1.
Estimation of reservoir permeability (indicative of flow rates)
based on log derived porosity and four pressure data points,
suggest that that reservoir section will flow gas.
Karoon has currently mapped, the well is located over one hundred
meters below the trap crest of the Poseidon structure with an
interpreted gross gas column for the structure of over 430m. The
area of the structure as currently mapped is around 280 square
kilometers. Remapping is underway.
Karoon’s analysis of seismic and well results to date indicate the
contingent resource discovered in this well is likely to be
consistent with or exceed Karoon’s pre drill prospective resource
range (P10-15 TCF, P50-7 TCF and P90-3 TCF).