JPDA PRODUCTION

JPDA: Monthly Production
Barrels of Oil Equivalent (BOE)

Previous 3 months

MonthProduction (BOE)
Feb '173,563,303.23
Mar '173,853,289.38
Apr '172,846,587.03

Autoridade Nacional do Petróleo

LAFAEK, Well Description

Well: BU-W02

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ANP ID:

W02

Region:

JPDA

Contact Area:

JPDA 03-12

Field Name:

Bayu Undan



Well Type:

Development

Classification:

Gas - Condensate



Total depth (m):

2750 MDRT/ 2030 TVDRT

RKB (m):

45.4

Seabed (m):

78.3

Start:

25-May-2002

Finish:

13-November-2002

Well Data (release):


Status:

Approved


Summary

The BU-W02 development well was drilled from the BU-WP1 platform by ENSCO 104 jackup rig. BU-WP1 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 25km south of the production facilities of Elang oil field and 480km northwest of Darwin. ConocoPhillips (91-12) Pty Ltd is the operator.

The Ensco 104 jackup drilling rig was on location on 15th May 2002 in 78.3 meters (LAT) of water depth and rotary table elevation of 45.4 meters above sea level. All depths are referenced to the Ensco 104 Rotary Table unless otherwise indicated. BU-W02 was spudded in on 25th May 2002, as part of batch drilling procedures with 5 other well. The well was drilled to the east and reached a total depth of 4697 mMDRT in 12 ¼" hole size on 13th November 2002. Hole instability problems resulted in BU-W02 being plugged and abandoned with two cement plugs between 2950-2801 mMDRT and 2801-2735.3 mMDRT respectively. An 11 ¾" liner was run and cemented at a depth of 2732.3 mMDRT.

BU-W02ST1 kicked off from a depth of 2740 mMDRT, on the 3rd December 2002. The W02-ST1 well reached a total depth of 4986 mMDRT in 8 ½” hole size using Oil Based Mud (LTOBM) on 28th December 2002. The well was cased and completed with 166 metres of net sands to be perforated as a condensate and gas producer.



SAMPLES, SIDEWALL CORES CONVENTIONAL CORES

Drill Cuttings

BU-W02

Ditch cuttings spot samples were collected at 5 or 10 m intervals in the 17 ½" hole section between 807.0 and 2413.0 mMDRT. Composite washed and unwashed ditch cuttings samples were collected for storage at 5 or 10 m intervals in the 12 ¼" hole section, between 2413.0 and 4697.0 mMDRT. A ditch cuttings sampling summary is listed in Table below.

BU-W02 Ditch Cuttings Sampling Type and Frequency

Interval
mMDRT
Sample
Frequency
Sample Type
Distribution
2740.0 to 3200.020 mWashed & UnwashedUnwashed:
ConocoPhillips 1 set
East Timor Gov’t 1 set

Washed:
ConocoPhillips 1 set
East Timor Gov’t 1 set
Geoscience Aust. 1 set
3200.0 to 3240.010 mWashed & Unwashed
3240.0 to 3520.020 mWashed & Unwashed
3520.0 to 3600.010 mWashed & Unwashed
3600.0 to 4520.020 mWashed & Unwashed
4520.0 to 4580.05/10 mWashed & Unwashed
4580.0 to 4690.020 mWashed & Unwashed
4690.0 to 4985.05 mWashed & Unwashed

Cores
No conventional cores were cut.
Sidewall Cores
No sidewall cores were acquired.

LOGGING AND SURVEYS
Mud logging
Sperry-sun Drilling Services provided the mud logging services with formation evaluation and pressure monitoring services from 123.7 mMDRT to total depth. Drilling rate, calcimetries, lithologies, total gas and chromatographic analysis of the ditch gas are plotted on the mudlog. Pressure indicators were measured and are plotted on the pressure log.

LWD Logging

BU-W02
Sperry-sun Drilling Services ran the open hole LWD logs that are summarised in Table.

BU-W02 Open Hole LWD Logging Suites and Intervals
Run
Hole

Size

Tool

String

Interval

(mMDRT)

Comments
40017½”DDS-GR-PWD807-1533Pulled out of hole at 1533 mMDRT after drawworks
brakes failed causing string to drop
50017½”DDS-BAT-GR-PWD1533-2133Some shocks registered on DDS while rotating with AGS open.
60017½”DDS-BAT-GR-PWD2133-2419DDS registering shocks especially while drilling with AGS open and backreaming.
70012½”GR-PWD-BAT-SLD2419-2419Failure due to fluid invasion into the connections between the pulser and the probes as a result of missing o-rings in the pulser.
80012¼”DDS-GR-PWD-BAT-SLD2419-2882Failed whilst backreaming to shoe. Pulser severely
damaged and jammed with debris from teflon spacer and rubber spacer washed out from top of SLD
90012¼”DDS-GR-PWD-BAT-SLD2882-4697Due to excess rotating/backreaming without circulation,
the SLD tool was damaged and data could not be
obtained from the tool's memory.
100012¼”DDS-GR-PWD4697-4697Cleanout run.



Wireline Logging

All logging was acquired in cased hole. CGG were used to acquire velocity VSP/Checkshot
data in BU-W02 in cased hole on a Halliburton Logging Services (HLS) wireline cable.
Cased hole Wireline Logging Suites Intervals
Suite
Run
Tool
String
Interval
(mRT)
BHT/Hrs
Since
Circ.
Comments
BU-W02
1
1
CGG Vertical
Incidence
Checkshot
770-123
Dual BSR-4 geophones run at
30m interval (flexible bridle). Tool hung up at 772m.
2
1
CGG Vertical
Incidence
Checkshot
2349-660
Checkshots at 1030 mMDRT,
1510 mMDRT and 2140 mMDRT on way in hole. Tool hung up at 2350m.
BU-W02ST1
1
1
CGG Vertical
Incidence
Checkshot
4939-2170Check levels not shot below 3080 mMDRT due to high angle below this depth. Two attempts required to run tool through top of liner PBR. Tool pickup depth was 4939
mMDRT.
2
1
CBL-GR-CCL4938-4484Main pass logged with 1000psi. Tool string lost in hole upon reaching surface.
2
2
CCL-Impression
Block
4528-4482Fish finding run. Tool held up in completion string before fish tagged.
2
3
CCL – Compact
Tool String
4926-4799Fish finding run #2. Fish tagged with lead impression block at 4926m.
2
4
CAST-GR-CCL4923-4474Main pass logged with 1000psi
2
5
Wireline Fishing
Overshot
Assembly
Fish tagged at 4926m. No visual damage to the fished CBL tool string











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