The BU-D08 development well was drilled from the BU-DPP platform by the Ensco 104 jackup rig. BU-DPP is located in the eastern 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 1st May 2002 and moved onto the BU-DPP location on 23rd July 2003, after completing operations on the Wellhead Platform (WP-1). The Ensco 104 jacked up in 79.4 metres (LAT) of water depth and an intermediate rotary table elevation of 48.6 metres above sea level. All depths are referenced to the Ensco 104 Rotary Table unless otherwise indicated. BU-D08 was spudded in on 16th September 2003, as part of batch drilling procedures. The D08 well was drilled to the northeast and reached a total depth of 4573 mMDRT in 8 ½" hole size on 2nd January 2004. A production liner has been run and the well completed and suspended pending perforation and hook up as an Elang/Plover gas/condensate producer. The perforation timing and intervals will be recorded in the BU-D08 Well Completion Report Volume 2 – Interpretive Data. The total number of days at the BU-D08 location was 52 days.
| Formation Tops | |
Formation Name MDRT TVDRT TVDLAT Thickness Comments
| |
| Sea Bed 128.0 128.0 -79.4 583.4 Oliver Formation 713.2 710.6 -662.0 58.0 Hibernia Formation 772.9 768.6 -720.0 418.4 Hibernia Marl 1258.7 1187.1 -1138.5 111.7 Grebe Sandstone Member 1433.5 1298.8 -1250.2 90.0 Johnson Formation 1581.0 1388.8 -1340.2 266.2 Intra Johnson J1 2005.7 1655.0 -1606.4 122.4 Johnson Marl 2189.9 1777.4 -1728.8 115.2 Upper Turnstone Formation 2367.6 1892.6 -1844.0 74.0 Middle Turnstone Formation 2483.2 1967.4 -1918.8 190.2 Lower Turnstone Formation 2791.5 2164.2 -2115.6 131.1 Vee Formation 3004.3 2295.3 -2246.7 133.8 Wangarlu Formation 3191.9 2416.9 -2368.3 430.5 Darwin Formation 3900.0 2847.4 -2798.8 60.1 Darwin Radiolarite 3993.7 2907.5 -2858.9 9.5 Echuca Shoals Formation 4008.1 2917.0 -2868.4 26.9 Flamingo Group 4048.5 2943.9 -2895.3 96.1 WSP/DJ 4204.8 3040.1 -2991.5 13.1 RA2.3 4228.4 3053.2 -3004.6 14.2 RA2.2 4254.7 3067.4 -3018.8 3.9 RA2.1 4261.8 3071.3 -3022.7 12.3 RA1.5 4285.5 3083.6 -3035.0 2.6 RA1.4 4290.5 3086.2 -3037.6 7.6 RA1.3 4305.1 3093.8 -3045.2 9.8 RA1.2 4324.1 3103.7 -3055.1 12.9 RA1.1 4349.3 3116.5 -3067.9 8.5 WD2.3 4366.3 3125.0 -3076.4 8.2 WD2.2 4382.7 3133.2 -3084.6 4.5 WD2.1 4391.5 3137.7 -3089.1 5 WD1 4401.4 3142.7 -3094.1 14.9 IC4 4430.5 3157.6 -3109.0 2.1 IC3 4434.6 3159.8 -3111.2 19.5 IC2 4471.9 3179.3 -3130.7 15.8 IC1 4501.9 3195.1 -3146.5 16.2 DC4 4532.0 3211.2 -3162.6 17.4+ TOTAL DEPTH 4573.0 3228.6 -3180.0 - | |
| Prepared by: | Wellsite Geologists |
SAMPLES, SIDEWALL CORES AND CONVENTIONAL CORES
Drill Cuttings
Ditch cuttings spot samples for geological description were caught at 5 or 10 m intervals in the 17 ½" hole section between 825.0 and 2464.0 mMDRT. Composite washed and unwashed ditch cuttings samples were collected for storage at 5 or 10 m intervals in the 12 ¼" and 8 ½" hole sections, between 2464.0 and 4573.0 mMDRT.
Ditch Cuttings Sampling Type and Frequency
| Sample Frequency |
|
|
825.0 to 2464.0 2464.0 to 4185.0 4185.0 to 4573.0 | 5 / 10 m 10 m 5 m | Spot Samples 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 |
Cores
No conventional cores were cut.
Sidewall Cores
No sidewall cores were acquired.
LOGGING
LWD Logging
Sperry-sun Drilling Services ran the open hole LWD logs.
| Hole Size | Tool
String |
| Comments |
| 17½” |
|
| Good run, no problems. |
| 12¼” |
|
| Good run, no problems. |
| 8 ½” |
|
4178.3 | Run in with diamond impregnated bit on Neyfor turbine assembly. Pulled out of hole after failing to attain FIT. Sensos did not get outside casing. |
| 8 ½” |
|
4381.0 | BAT tool failed surface test (problem with flashmemory). Changed out for backup tool (0.5 hours lost time). |
| 8 ½” |
|
| Pulser changed out, put post Run 800 as a precautionary measure. Good recorded data. Reached TD at 4564 mMDRT. |
Wireline Logging
All logging was acquired in cased hole. CGG were used to acquire velocity VSP/Checkshot data in BU-D08 on a Halliburton Logging Services (HLS) wireline cable and HLS acquired cased-hole cement bond wireline logs that are summarised in Table below.
Cased Hole Wireline Logging Suites and Intervals
| Suite | Run | Tool
String |
(mRT) | BHT/Hours Since Circ. |
|
1 | 1 | CBL-CAST-GR |
|
| Under-pressured main past CBL- CAST data indicates good cement bonding. Pressured (1400 psi) pass indicated an average 5 to 8 mv improvement in cement bonding. |
1 | 2 | VSP |
|
| Three QC levels at 2470/2500, 2830/2860 and 3070/3100 on the way in. Tool hung up at 4505 mMDRT and could not go past this depth. First VSP level is 4480-4450 mMDRT. At surface found the wireline between the two geophones 18.4 m instead of 30 m. Two thermometers and their housings were lost down hole. |
1 | 3 |
| 4541.5-3990 |
| Junk basket run on wireline failed to tag any part of the thermometers. |