LAFAEK, Well Description

The BU-D15 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 and following completion of drilling, completion and flow testing operations on the BU-WP1 platform the rig was towed to the BUDPP platform jacket where it was pinned on location on 23rd July, 2003. The rig was initially jacked up adjacent to the BU-DPP jacket (platfom topsides not in place at time of spud) in 79.4 metres of water to an initial rotary table elevation of 35.9 metres above sea level (LAT) and the cantilever skidded out over the platform jacket.

BU-D15 is currently suspended pending offline perforation and initial commissioning as a
gas injector. The perforation timing and intervals will be recorded in the BU-D15 Well Completion Report Volume 2 – Interpretive Data. The total number of days at the BU-D15
location was 70 days.

Formation Tops
Formation Name	MDRT (m)	TVDRT (m)	TVDLAT (m)	Thickness (m)	Comments
Sea Bed	128.0	128.0	-79.4	-	Rig Jacked up to 48.6m after reaching 3690 m
Hibernia Marl	1284.9	1197.5	-1148.9	107.3
Grebe Sandstone Member	1420.1	1304.8	-1256.2	82.4
Johnson Formation	1522.6	1387.2	-1338.6	259.1
Intra Johnson J1	1859.9	1646.3	-1597.7	112.9
Johnson Marl	2018.2	1759.2	-1710.6	118.8
Upper Turnstone Formation	2191.7	1878.0	-1829.4	77.1
Middle Turnstone Formation	2306.8	1955.1	-1906.5	186.0
Lower Turnstone Formation	2574.6	2141.1	-2092.5	132.5
Vee Formation	2767.2	2273.6	-2225.0	134.7
Wangarlu Formation	2957.4	2408.3	-2359.7	397.3
Darwin Formation	3543.0	2805.6	-2757.0	57.7
Darwin Radiolarite	3628.1	2863.3	-2814.7	10.7
Echuca Shoals Formation	3643.6	2874.0	-2825.4	19.4
Flamingo Group	3671.1	2893.4	-2844.8	93.6
RA1.2 (Elang Formation)	3813.8	2987.0	-2938.4	0.7
RA1.2	3816.9	2987.7	-2939.1	13.4
RA1.1	3841.3	3001.1	-2952.5	9.0
WD2.3	3858.2	3010.1	-2961.5	6.3
WD2.2	3870.2	3016.4	-2967.8	4.2
WD2.1	3878.2	3020.6	-2972.0	4.3
WD1	3886.5	3024.9	-2976.3	16.1
IC4	3917.9	3041.0	-2992.4	8.9
IC3	3935.2	3049.9	-3001.3	21.0
IC2	3977.3	3070.9	-3022.3	8.2
IC1	3994.0	3079.1	-3030.5	8.9
DC4	4011.8	3088.0	-3039.4	15.3
DC3	4041.9	3103.3	-3054.7	34.5
DC2	4111.5	3137.8	-3089.2	6.2
DC1	4125.0	3144.0	-3095.4	14.7
T4	4157.2	3158.7	-3110.1	0.9
T3	4199.1	3178.2	-3129.6	10.3
T2	4220.9	3188.5	-3139.9	26.6
T1	4276.6	3215.1	-3166.5	-
TOTAL DEPTH	4373.5	3259.8	-3211.2	-

Drill Cuttings

(Measured depths referenced to RT 48.6m)

Ditch cuttings spot samples for geological description were caught at 10 m intervals in the 17½" hole section between 827.7 and 1379.7 mMDRT. From lag depth 1379.7 to the 17½"section total depth of 2269.7 mMDRT there were no returns. Composite washed and unwashed ditch cuttings samples were collected for storage at 10 m intervals in the 12 ¼" hole section and at 5 m intervals in the 8 ½" hole section.

Interval mMDRT	Sample Frequency	Sample Type	Distribution
127.7 to 827.7	None	No returns	Unwashed: ConocoPhillips 1 set East Timor Gov’t 1 set
827.7 to 1379.7		Spot Samples
1379.7 to 2269.7	None	No Returns
2269.7 to 3695.7	10m	Washed & Unwashed	Washed: ConocoPhillips 1set East Timor Gov’t 1 set Geoscience Aust. 1 set
3702.4 to 4373.5	5m

Cores

No conventional cores were cut.

Sidewall Cores

No sidewall cores were acquired.

LOGGING AND SURVEYS

LWD Logging

(Measured depths referenced to RT 48.6m)

Sperry-sun Drilling Services ran the open hole LWD logs that are summarised in table below.

Run	Hole Size	Tool String	Interval (mMDRT)	Comments
100	36"	Nil	127.7-132.0	Spud assembly - no MWD.
200	36"	DWD	132.0-164.0	Directional only.
300	26"	DWD	164.0-827.7	Directional only.
400	17½”	DDS-GR-PWD- DWD	827.7- 1360.7	Drilled without returns from 1353.7 mMDRT. POOH after noting string blockage following pumping of LCM pill via PBL sub. Surface inspection revealed pulser popett had sheared off and passed up through tool orifice.
500	17½"	DDS-GRPWD- Dir	1360.7- 2269.7	Drilled without returns for entire run. Poor real time detection most likely as a result of on bottom noise (verified by DDS log) and fluctuating annulus level.
600	12 ¼"	DDS-GRPWD- Dir	2269.7 - 2297.7	Tools not downloaded before running back in hole for Run 700.
700	12 ¼"	DDS-GRPWD- Dir	2297.7 - 3702.7	Lost MWD pulse at 3386.7 mMDRT. Tool stopped recording directional surveys from 3571.7 mMDRT. No peak and average vibrations recorded from 3583.7 and 3629.7 mMDRT respectively.
800	8 ½"	DDS-DGRSLD- EWP4- CNP-BATACAL	3702.7 - 4013.0
900	8 ½"	DDS-DGRSLD- EWP4- CNP-BATACAL	4013.0 - 4373.5

(Measured depths referenced to RT 48.6m)

An unsuccessful attempt was made to run open hole logs with Halliburton Logging Services (HLS) in 12 ¼" hole prior to running of the 9 ⅝"liner. Logging operations were aborted while running in hole during the first run due to adverse hole conditions. While pulling out of hole the tools became stuck at the casing shoe necessitating a strip over wireline fishing operation.