The BU-D05 / BU-D05ST1 development well was drilled from the BU-DPP platform by the Ensco 104 jackup rig. BU-DPP is located in the western half of the Bayu-Undan gas condensate field which is in the Production Sharing Contract (PSC) areas of JPDA 03-12 and JPDA 03-13, North Bonaparte Basin, Timor Sea, offshore Northwest Australia.
The location is approximately 250km south of East Timor and 480km northwest of Darwin. ConocoPhillips (03-12) Pty Ltd is the operator. The Ensco 104 jackup drilling rig (previously the Chiles Discovery) was on contract on the Bayu-Undan Field on 1st May, 2002 following the completion of drilling, completion and flow testing operations on the BU-WP1 platform. The rig was towed to the BU-DPP platform jacket where it was pinned on location on 23rd July, 2003. The BU-D05 well was spudded on 14th September 2003.
| FORMATION TOPS: | BU-D05 | ||||
| Formation Name |
(m) | TVDRT (m) | TVDLAT (m) | Thickness (m) | Comments |
| Sea Bed |
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| Oliver Formation |
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| Hibernia Formation |
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| Hibernia Marl |
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| Grebe Sandstone Member |
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| Johnson Formation |
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| Intra Johnson J1 |
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| Johnson Marl |
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| Upper Turnstone Formation |
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| Middle Turnstone Formation |
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| Lower Turnstone Formation |
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| Vee Formation |
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| Wangarlu Formation |
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| Darwin Formation |
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| Darwin Radiolarite |
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| Echuca Shoals Formation |
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| Flamingo Group |
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| - | |
| TOTAL DEPTH |
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| - | |
| FORMATION TOPS: | | ||||
| BU-D05ST1 | |||||
| Formation Name |
(m) | TVDRT (m) | TVDLAT (m) | Thickness (m) | Comments |
| Middle Turnstone Formation |
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| Lower Turnstone Formation |
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| Vee Formation |
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| Wangarlu Formation |
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| Darwin Formation |
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| Echuca Shoals Formation |
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| Flamingo Group |
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| Elang Formation |
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| - | |
| RA2.3 |
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| RA2.2 |
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| 3.1 | |
| RA2.1 |
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| RA1.5 |
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| 5.5 | |
| RA1.4 |
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| 5.3 | |
| RA1.3 |
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| RA1.2 |
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| RA1.1 |
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| 6.8 | |
| WD2.3 |
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| 8.9 | Target T19A |
| WD2.2 |
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| 7.0 | |
| WD2.1 |
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| 4.5 | |
| WD1 |
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| Plover Formation/IC4 |
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| 1.7 | |
| IC3 |
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| - | |
| TOTAL DEPTH |
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| - | |
Drill Cuttings
(Measured depths referenced to RT 58.0 m)
Ditch cuttings spot samples for geological description were caught at 10 m intervals in the16” hole section between 844.0 and 2460 mMDRT. Composite washed and dried ditch cutting samples were collected for storage in the 12 ¼” and hole section between 2460.0 m and 4598.0 mMDRT.
A ditch cuttings sampling summary is listed in table 1.
Table 1. BU-D05 Ditch Cuttings Sampling Type and Frequency
Interval mMDRT | Sample Frequency | Sample Type | Distribution |
137.4 to 844.0 844.0 to 2460.0 2460.0 to 4598.0 | None 10 m 10 m | No returns Spot Samples Washed & Unwashed | Unwashed: ConocoPhillips 1 set East Timor Gov’t 1 set Washed: ConocoPhillips 1 set East Timor Gov’t 1 set Geoscience Aust. 1 set |
BU-D05ST1
(Measured depths referenced to RT 58.0 m)
Composite washed and unwashed ditch cuttings samples were collected for storage at 10
and 3 m intervals in the 10 ⅝" x 12 ¼", 8 ½” and 6 ¾” hole sections, between 2461.0 and
4971.0 mMDRT.
Table 2. A ditch cuttings sampling summary.
Interval mMDRT | Sample Frequency | Sample Type | Distribution |
| 2461.0 to 4335.0 4335.0 to 4971.0 | 10 m
3 m | Washed & unwashed
Washed & Unwashed | Unwashed: ConocoPhillips 1 set East Timor Gov’t 1 set Washed: ConocoPhillips 1 set East Timor Gov’t 1 set Geoscience Aust. 1 set |
Hydrocarbon Shows
Gas shows are summarized.
Cores
No conventional cores were cut.
Sidewall Cores
No sidewall cores were acquired.
LOGGING AND SURVEYS
LWD Logging
BU-D05
(Measured depths referenced to RT 58.0 m)
Sperry-sun Drilling Services ran the open hole LWD logs that are summarized.
Table 3. BU-D05 Open Hole LWD Logging Suites and Intervals
| Run | Hole Size | Tool String | Interval (mMDRT) | Comments |
| 100 | 36.00 | No tools in hole | 137.4 - 141.4 | No MWD tools in hole |
| 200 | 36.00 | No tools in hole | 141.4 - 173.9 | No MWD tools in hole |
| 300 | 26.00 | DWD | 174.4 - 844.4 | Run only Directional tool |
| 400 | 16.00 | DDS-DIR-GR | 844.4 - 1382.0 | |
| 500 | 16.00 | DDS-DIR-GR | 1382.0 - 1400.0 | |
| 600 | 16.00 | DDS-DIR-GR | 1400.0 - 1931.0 | |
| 700 | 16.00 | DDS-DIR-GR | 1931.0 - 2160.0 | |
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| End of LWD run taken as time of twist off – 23/10/04. |
BU-D05ST1
(Measured depths referenced to RT 58.0 m)
Sperry-Sun Drilling Services ran the open hole LWD logs that are summarised in Table 4.
Table 4. BU-D05ST1 Open Hole LWD Logging Suites and Intervals
| Run | Hole Size | Tool String | Interval (mMDRT) | Comments |
| 1000 | 12.25 | DDS-DGR-Dir | 2461.0 - 2578.0 | |
| 1100 | 12.25 | DDS-DGR-Dir 1200 | 2578.0 - 4435.0 | |
| 1200 | 8.50 | DIR-CNP-DGRDDS- EWR-SLDACAL- BAT | 4335.0- 4484.0 | One transceiver in ACAL tool suspected to be damaged. Calliper processed using pseudo calliper from Density tool |
| 1300 | 8.5 | | 4674.0 – 4674.0 | No tools in hole |
| 1400 | 6.75 | DIR-RES-DGRALD- CTN | 4674.0 - 4971.0 | |