| FEBRUARY 2003 - RELEASES |
| UPDATE: (27-02-03) |
RIG RELEASED FROM VINDARA-1 KEY POINTS ·
The
Ensco 53 drilling rig has commenced plug and abandonment of the Vindara–1
well · The drilling rig will move this week to the site of the Cliff Head-4 appraisal well
Roc Oil (WA) Pty Limited (“ROC”), Operator for and on behalf of the WA-286-P Joint Venture, advises that, as at 1100 hours Western Standard Time (“WST”), on 26 February 2003, the Ensco 53 drilling rig had completed logging operations and was commencing plug and abandonment of the Vindara–1 well. Evaluation logging, conducted during the last two days, established that, although there were oil shows in a few poor quality sands below the regional seal, no moveable hydrocarbons were encountered. The Ensco 53 drilling rig will move this week to the location of the Cliff Head-4 appraisal well located approximately one kilometer to the southeast of the recently drilled Cliff Head-3 well (Attachment-1). Cliff Head-4 is programmed as a vertical well to be drilled to a depth of 1,386 metres below Rotary Table. Dr John Doran, ROC’s Chief Executive Officer, stated that: “The release of the rig from the Vindara-1 location brings to an end ROC’s recent spate of wildcat exploration drilling in the northern part of the offshore Perth Basin. However, within the next week, ROC’s global exploration drilling programme will continue with the drilling of an exploration well to test the Squirrel Prospect in the UK North Sea, where ROC has a 12.4% interest. At the same time ROC’s Cliff Head appraisal drilling program will continue with the drilling of CH-4 and, if warranted, CH-5.”
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran
|
| DRILLING ACTIVITY UPDATE: VINDARA-1 (24-02-03) |
KEY POINT ·
The
Vindara-1 exploration well, has drilled to a depth of 1,700 metres below
Rotary Table without encountering any indications of significant hydrocarbons.
Roc Oil (WA) Pty Limited ("ROC"), Operator for and on behalf of the WA-286-P Joint Venture, advises that, at 0600 hours Western Standard Time ("WST"), on 24 February 2003, drilling operations were continuing at a depth of 1,700 metres below Rotary Table at the Vindara-1 exploration well in WA-286-P, in the northern part of the offshore Perth Basin. Since the last ASX Release the well has drilled to a depth of 1,700 metres below Rotary Table, without encountering any indications of significant hydrocarbons. The well is currently being prepared for drilling ahead to Total Depth. Regardless of the results of Vindara-1, the well will be plugged and abandoned following wireline logging. The Vindara Prospect, which straddles the boundary between WA-286-P and TP/15, is approximately 6.5 kilometres southeast of the Cliff Head Oil Field (Attachment 1). Vindara-1
is the fourth well in a multi-well drilling programme being conducted
on a back-to-back basis in WA-286-P and the adjacent TP/15. The WA-286-P
Joint Venture has agreed to drill at least one further well after Vindara-1:
Cliff Head-4 ("CH-4"), an appraisal well in the Cliff Head Field.
The full extent of the programme will be determined after the results
of CH-4 are known.
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran
|
| DRILLING ACTIVITY UPDATE (19-02-03) |
VINDARA-1 EXPLORATION WELL COMMENCES DRILLING KEY POINT ·
On
19 February 2003, the ENSCO 53 jack-up drilling rig started drilling the
Vindara-1 exploration well in WA-286-P, in the northern part of the offshore
Perth Basin.
Roc Oil (WA) Pty Limited ("ROC"), Operator for and on behalf of the WA-286-P Joint Venture, advises that, at 0700 hours Western Standard Time ("WST"), on 18 February 2003, the ENSCO 53 jack-up drilling rig was released from the Mentelle-1 exploration well location in the northern part of the offshore Perth Basin after plugging and abandoning that well as dry hole with sub-commercial oil shows. At 0630 hours
WST the rig commenced drilling the Vindara-1 exploration well in WA-286-P
in the northern part of the offshore Perth Basin, approximately 6.5 kilometres
southeast of the Cliff Head Oil Field (Attachment
1) The well, which will be drilled as a vertical well to a Total Depth
of 1,843 metres below Rotary Table, is the fourth in a multi-well drilling
programme being conducted on a back-to-back basis in WA-286-P and the
adjacent TP/15. Regardless of drilling results, Vindara-1 will be plugged
and abandoned without testing for reasons relating to operational cost
efficiencies. ROC anticipates that its next ASX Release regarding Vindara-1 will be issued early next week after it has intersected the top of the targeted reservoir section.
"The
fact that Vindara-1 was not included in the original minimum three well
drilling programme can be taken as evidence that the prospect is generally
regarded as being riskier than the other two exploration wells in that
programme: Twin Lions-1 and Mentelle-1. However, the fact that both Vindara-1
and Cliff Head-4 have been added to the current drilling programme highlights
the fact that there is an increased level of confidence that the Cliff
Head Oil Field is a strong candidate for development following the encouraging
results from the production test at CH-3-ch1."
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran
|
| DRILLING ACTIVITY UPDATE (17-02-03) |
DRILLING ACTIVITY UPDATE: MENTELLE-1 KEY POINT ·
Wireline
logging at the Mentelle-1 exploration well has established that the previously
reported oil shows, in the upper part of the main reservoir target, are
not of any commercial significance.
Roc Oil (WA) Pty Limited ("ROC"), Operator for and on behalf of the WA-286-P Joint Venture, advises that, at 0530 hours Western Standard Time ("WST"), on 17 February 2003, plugging and abandonment operations were underway at the Mentelle-1 exploration well in WA-286-P in the northern part of the offshore Perth Basin. Wireline logging, conducted during the last two days, established that the oil shows recorded in the upper part of the main reservoir target are residual/immovable and, as such, they are of no commercial significance. Mentelle-1 will now be plugged and abandoned and the rig will move to drill the Vindara-1 exploration well on a prospect which straddles the boundary between WA-286-P and TP/15, approximately 6.5 kilometres to the southeast of the Cliff Head Oil Field (Attachment-1). Vindara-1
will be the fourth well in a multi-well drilling programme being conducted
on a back-to-back basis in WA-286-P and the adjacent TP/15. The WA-286-P
Joint Venture has agreed to drill at least one further well after Vindara-1,
Cliff Head-4, an appraisal well in the Cliff Head Field
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran
|
| ACTIVITY UPDATE (14-02-03) |
MENTELLE-1 DRILLS INTO TOP OF TARGETED RESERVOIR AND ENCOUNTERS OIL SHOWS KEY POINT ·
The
Mentelle-1 exploration well, has intersected the top of the targeted reservoir
section and has encountered oil shows. The significance of the shows will
not be known until the well has reached Total Depth and a full suite of
wireline logs has been run within the next few days.
Roc Oil (WA)
Pty Limited ("ROC"), Operator for and on behalf of the TP/15
Joint Venture, advises that, at 0530 hours Western Standard Time ("WST"),
on 14 February 2003, the Mentelle-1 exploration well in WA-286-P in the
northern part of the offshore Perth Basin was drilling ahead in 8½
inch hole at 1,332 metres below Rotary Table ("mBRT"). The top
of the main reservoir target was encountered at approximately 1,280 mBRT.
Oil shows have been encountered throughout that part of the reservoir
that had been drilled to Report Time. The full significance of these oil
shows will not be known until wireline logs have been run after the well
has reached Total Depth of 1,570 mBRT, probably within the next few days.
Regardless of the results of Mentelle-1 the well will be plugged and abandoned
for reasons relating to operational cost efficiencies. Mentelle-1
is the third well in a multi-well drilling programme being conducted on
a back-to-back basis in WA-286-P and the adjacent TP/15. The WA-286-P
Joint Venture has agreed to drill at least two further wells after Mentelle-1:
Vindara-1, an exploration well which will test a prospect which straddles
the WA-286-P - TP/15 boundary, and Cliff Head-4, an appraisal well in
the Cliff Head Field The full extent of the programme will be determined
after the results of these wells.
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran |
| ACTIVITY UPDATE (12-02-03) |
MENTELLE-1 EXPLORATION WELL STARTS DRILLING, OFFSHORE NORTHERN PERTH BASIN, WESTERN AUSTRALIA KEY POINTS ·
On
11 February 2003, drilling operations commenced at the Mentelle-1 exploration
well location in WA-286-P. During the next seven days the well is expected
to penetrate the potential reservoir, reach Total Depth and run a preliminary
suite of logs. ·
The WA-286-P Joint Venture has agreed that Mentelle-1 will be followed
by Vindara-1, an exploration well which will test a prospect which straddles
the boundary between WA-286-P and the adjacent TP/15. It is also expected
that the Joint Venture will drill Cliff Head-4 immediately after Vindara-1.
Roc Oil (WA) Pty Limited (“ROC”), Operator for and on behalf of the WA-286-P Joint Venture, advises that the Ensco-53 jack up drilling rig arrived at the Mentelle-1 surface location on 10 February 2003 and commenced drilling at 2100 hours Western Standard Time (“WST”) on 11 February 2003. As of 0530 hours WST, Wednesday, 12 February 2003, the well was drilling ahead at 312 metres. The Mentelle-1 surface location is approximately two kilometres northeast of the northern boundary of the Cliff Head Oil Field (Attachment 1). The well will be drilled as a vertical hole to a Total Depth of 1,592 metres below Rotary Table. Regardless of drilling results, the well will be plugged and abandoned without testing for reasons relating to operational cost efficiencies. ROC expects that its next ASX Release will be issued after Mentelle-1 has intersected the reservoir, which is likely to be within a week. As a consequence of the successful testing of the Cliff Head Oil Field appraisal well CH-3-ch-1, the WA-286-P Joint Venture has agreed to drill at least one additional well after operations at Mentelle-1 have been completed: Vindara-1. This well will test an exploration prospect, which straddles the boundary between WA-286-P and TP/15, approximately three kilometres to the southeast of the Cliff Head Oil Field (Attachment 1). Further decisions about the details of the forward drilling programme subsequent to Vindara-1 will be made nearer the time, in the light of the drilling results analysed between now and then, but it is currently expected that Vindara-1 will be followed immediately by Cliff Head-4.
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
“Despite its proximity to the Cliff Head Oil Field, the Mentelle Prospect has genuine exploration risk attached to it because seismic coverage has been constrained by the presence of shallow sea bottom conditions”. John
Doran |
| ACTIVITY UPDATE (11-02-03) |
|
KEY POINT ·
On
Monday, 10 February 2003, the ENSCO 53 jack-up drilling rig was released
from the Twin Lions-1 exploration well location after plugging and abandoning
the well as a dry hole.
Roc Oil (WA) Pty Limited (“ROC”), Operator for and on behalf of the TP/15 Joint Venture, advises that, at 1700 hours Western Standard Time (“WST”), on 10 February 2003, the ENSCO 53 jack-up drilling rig was released from the Twin Lions-1 exploration well location in the northern part of the offshore Perth Basin. The well was plugged and abandoned as a dry hole after drilling to a Total Depth of 1,570 metres below Rotary Table and running a full suite of wireline logs. Twin Lions-1
was the second well of a multi-well programme being conducted on a back-to-back
basis in TP/15 and the adjacent WA-286-P. The programme consists of a
minimum of three wells: Cliff Head-3, Twin Lions-1 and Mentelle-1. The
full extent of the programme will be determined by the results of the
first three wells.
Hardman Oil
& Gas Pty Ltd . . . . . . . . . . . . . . .
30.0%
John
Doran |
| ACTIVITY UPDATE (06-02-03) |
|
KEY POINT ·
The
Twin Lions-1 exploration well in TP/15, in the northern part of the offshore
Perth Basin, has not encountered any oil indications in the upper part
of the prognosed reservoir section and is currently drilling ahead to
Total Depth.
Roc Oil (WA)
Pty Limited ("ROC"), Operator for and on behalf of the TP/15
Joint Venture, advises that, at 1100 hours Western Standard Time ("WST"),
on 6 February 2003, the Twin Lions-1 exploration well, in the northern
part of the offshore Perth Basin, was drilling ahead in the prognosed
reservoir objective and had not encountered any oil indications in the
upper part of the potential reservoir section. The well will continue
to drill to Total Depth where wireline logs will be run, probably within
the next 24-36 hours.
Hardman Oil
& Gas Pty Ltd . . . . . . . . . . . . . . .
30.0%
John
Doran |
| ACTIVITY UPDATE (03-02-03) |
|
KEY POINTS ·
The
ENSCO-53 jack-up drilling rig arrived at the Twin Lions-1 exploration
well location in TP/15, in the northern part of the offshore Perth Basin,
on 31 January 2003 and commenced drilling on 1 February 2003. During the
next week the well is expected to penetrate the potential reservoir, reach
Total Depth and run a preliminary suite of logs. ·
Twin Lions-1 is the second well of at least three and, possibly,
as many as nine (including planned significant sidetracks) exploration
and appraisal wells to be drilled during 1Q03 in TP/15 and the adjacent
WA-286-P. The wells will be drilled on a back-to-back basis within, and
on trend from, the Cliff Head Oil Field, which is located in WA-286-P.
Roc Oil (WA) Pty Limited ("ROC"), Operator for and on behalf of the TP/15 Joint Venture, advises that the Ensco-53 jack-up drilling rig arrived at the Twin Lions-1 surface location on 31 January 2003 and commenced drilling at 2100 hours Western Standard Time ("WST") on 1 February 2003. As of 0600 hours WST Monday 3 February 2003, the well was drilling ahead in 12¼ inch hole at 433 metres below the rotary table. The Twin Lions-1 surface location is approximately 8 kilometres north of the Cliff Head-3 surface location in the adjacent WA-286-P (Attachment 1). Twin Lions-1 will be drilled, as a vertical hole, to a total depth of 1,540 metres subsea to test the Twin Lions Prospect which straddles the boundary between WA-286-P and TP/15. Currently, the Twin Lions Prospect is considered to be the largest prospect in the vicinity of the Cliff Head Oil Field. Subject to the drilling results, the well may be sidetracked into that part of the structure which lies within the adjacent part of WA-286-P. ROC expects
that its next ASX release will be issued after Twin Lions-1 has intersected
the reservoir, which is likely to be within a week.
Hardman Oil
& Gas Pty Ltd . . . . . . . . . . . . . . .
30.0%
John
Doran |
| ACTIVITY UPDATE (03-02-03) |
RIG RELEASED FROM CLIFF HEAD-3 LOCATION, OFFSHORE NORTHERN PERTH BASIN, WESTERN AUSTRALIA KEY POINTS ·
The
Ensco-53 jack up drilling rig has been released from the Cliff Head-3
("CH-3") surface location in WA-286-P, in the offshore Perth
Basin on 31 January 2003, after successfully testing the CH-3-ch1 appraisal
well. ·
The rig has relocated to drill the exploration well, Twin Lions-1,
in the adjacent TP/15.
Roc Oil (WA) Pty Limited, Operator for and on behalf of the WA-286-P Joint Venture, advises that the Ensco-53 jack-up drilling rig has completed operations at the CH-3 surface location and was released at 1615 hours Western Standard Time (WST) on 31 January 2003. The rig has relocated approximately 8 kilometres to the north, where it will drill the Twin Lions-1 exploration well in the adjacent TP/15. The Twin
Lions Prospect, which straddles the boundary between WA-286-P and TP/15,
is currently considered to be the largest prospect in the vicinity of
the Cliff Head Oil Field. Subject to the drilling results, Twin Lions-1
may be sidetracked into that part of the structure which lies within WA-286-P.
Roc Oil (WA)
Pty Ltd (Operator) . . . . . . . . . . .
30.0%
John
Doran |