Santos Indonesian drilling update

Thursday, May 12 2005 - 07:31 AM WIB

Santos Indonesian drilling update

The following is excerpt from Santos Limited?s Weekly Drilling Report for week ending May 12, 2005:

Wildcat Exploration WellsBisma 1
TypeGas Exploration
LocationOffshore Indonesia
Brantas PSC, East Java Basin. 15.0km SE of the Maleo Gas Field 1, and some 140km E of Surabaya.
Status at 0600hrs -- 11/05/05 Running wireline logs. The current depth is 1594m with 574m progress for the week.
Planned Total Depth1073m
InterestLapindo Brantas 50%
Medco Sampang 32%
Santos Group 18%
OperatorLapindo Brantas

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Delineation well (Near Field Exploration/Appraisal Well)Tanggulangin 4 ST1
TypeOil Appraisal
LocationOnshore Indonesia
Brantas PSC, East Java Basin. 1.0km N of Tanggulangin 1, 5.0km E of the Wunut Field facilities, and some 35km S of Surabaya.
Status at 0600hrs -- 11/05/05 Running wireline logs. The current depth is 1143m with 135m progress for the week.
Planned Total Depth1073m
InterestLapindo Brantas 50%
Medco Sampang 32%
Santos Group 18%
OperatorLapindo Brantas

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Development WellsOyong Development
TypeOil Development:
LocationOffshore Indonesia, East Java Basin
Sampang PSC, 40km E of Jeruk 1 and some 80km E of Surabaya.7 Deviated Well Batch Drilling Program (Oyong 4 DW1 ? Oyong 10 DW1)
Status at 0600hrs -- 12/05/05 Batch drilling and cementing conductors to approx 125m. Currently 3/7 drilled.Operations commenced on the Oyong Development on 03/05/05.
Planned Total Depth920m SS
InterestSantos Group 45.0%
Singapore Petroleum Sampang Ltd 40.0%
Cue Sampang Pty Ltd 15.0%
OperatorSantos Group

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