The BU-D13 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 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 BU-DPP platform jacket where it was pinned on location 23rd July, 2003.
BU-D13 was spudded on 18th September 2003 and currently BU-D13 is plugged and suspended.
Formation Tops
| Formation Name | MDRT | TVDRT | TVDLAT | Thickness | Comments |
| Sea Bed Hibernia Marl Grebe Sandstone Member Johnson Formation Intra Johnson J1 Johnson Marl TOTAL DEPTH | 137.4 1266.4 1438.8 1601.7 2115.9 2359.5 2533.0 | 137.4 1191.9 1307.3 1399.1 1664.3 1780.2 1864.6 | - 79.4 -1133.9 -1249.3 -1341.1 -1606.3 -1722.2 -1806.6 | - 115.4 91.8 264.9 115.9 - - |  |
Drill Cuttings
(Measured depths referenced to RT 58.0 m)
Ditch cuttings spot samples for geological description were caught at 10 m intervals in the
16" hole section between 846.4 m and 1700.0 mMDRT. Samples were not collected
between 1700.0 and 2533 mMDRT due to lost returns.
Table 1: Ditch Cuttings Sampling Type and Frequency
Interval mMDRT | Sample Frequency | Sample Type | Distribution |
137.4 to 846.4 846.4 to 1700.0 1700.0 to 2533.0 | None 10 m | No returns Spot Samples No samples - No returns | |
Gas shows are summarised.
Cores
No conventional cores were cut.
Sidewall Cores
No sidewall cores were acquired.
LOGGING AND SURVEYS
LWD Logging
(Measured depths referenced to RT 58.0 m)
Sperry-sun Drilling Services ran the open hole LWD logs that are summarized in Table 2.
Table 2: Open Hole FEWD Logging Suites and Intervals
Run | Hole Size | Tool String | Interval (mMDRT) | Comments |
100 | 36" | | | No MWD tools run |
200 | 36" | | | No MWD tools run |
300 | 26" | DIR | 173.9 – 846.4 | |
400 | 16” | DIR/DDS/ DGR | 846.4 – 1652.0 | |
500 | 16” | DIR/DDS/ DGR | 1652.0 – 2285.0 | |
600 | 16” | DIR/DDS/ DGR | 2285.0 – 2533.0 | Tools left in hole after drillstring got stuck at 1561 mMDRT. String was backed off at 1386.5 mMDRT. |
Wireline Logging
(Measured depths referenced to RT 58.0 m)
Wireline logging services were supplied by Halliburton Logging Services (HLS). No open hole logging operations were run in BU-D13.
Suite | Run | Tool String | Interval (mMDRT) | BHT/Hours Since Circ. | Comments |
1 | 1 | Free Point | 1383.0 – 1300.0 | N/A | Pumped tool through crossover at 1338 mMDRT and through jars to 1383 mMDRT (pipe free to this depth). Unable to go deeper. Pulled out of hole and installed two sets of swab cups and third sinker bar. |
1 | 2 | Free Point | 1525.0 – 1383.0 | | Drill string free to 1475mMDRT. Ran tool down into 8 ¼" drill collars and found slight movement in top collar but could not confirm same due to free point tool failure. |
1 | 3 | DCST | 1480.6 | | Backoff attempted at 6 5/8" heavyweight tool joint at 1480.6 mMDRT. DCST charge detonated but failed to sever string. |
1 | 4 | DCST | | | Backoff attempted at 1471.0 mMDRT while holding overpull and torque in string. DCST charge detonated but no surface indication of drill string parting. Severing operation failed. |