Another gas discovery at KG-DWN-98/2 for ONGC

Vol 10, PW 1 (04 May 06) Exploration & Production

Transocean deepwater drillship Discoverer Seven Seas has struck gas for ONGC at KG-DWN-98/2, where Cairn Energy holds 10%.

This discovery was made at prospect E-1, which sits in 650 metres water. Spud on 8th March, the well drilled to 2556 metres in a 25-day drilling programme that went smoothly.

The first gas show at this location was at 1600 metres where estimates are the pay zone will be about eight metres thick. Another gas show was encountered at between 2300 and 2400 metres where a pay zone of between 35 and 40 metres is expected.

Discoverer did not test this well but moved out soon after logging. The rig had to go to Singapore for dry docking, we are told.

She got a slot at this time and there was no choice. Discoverer will return from dry dock mid June but instead of coming back to test E-1 she will drill at E (d) which lies 1.5-km south west of E-1.

Discoverer will sit in 950 metres water at E (d) prospect and will drill to a target depth of 3200 metres to Miocene sediments. ONGC expects a gas discovery at E (d) prospect also.

Testing of E-1 and E (d) will happen simultaneously when drilling at E (d) is completed. Separately, deepwater drillship Belford Dolphin began drilling a well at eastern offshore location GD-1-6 in the first week of April.

Belford is sitting in 1035 metres water and has been assigned a target depth of 4000 metres to reach Pliocene and Miocene sediments. Last week the drill bit reached 1900 metres but ONGC is facing problems There is a lot of well activity, we are told.

This is typical of all wells drilled in the GD area. Industry sources say ONGC is not very optimistic about GD-1-6.

Once a well starts giving problems the chances of a strike are very remote. But you cant be sure.

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