Nothing but dry deepwater wells at ONGC

Vol 8, PW 12 (08 Sep 04) Exploration & Production
     

Still no good news to report from three deepwater drilling rigs working for ONGC: Sagar Vijay, Belford Dolphin or Discoverer Seven Seas.

Sagar Vijay has drilled a dry hole at its third location offshore KG-DS-OS/3 defying hopes of a strike during testing after drilling stopped late July. Two objects were identified for conventional testing, a source tells us.

The first was water bearing and the second is also likely to be water bearing. Sagar Vijay now moves to her fourth location, most likely on the same block.

On 28th August, Belford abandoned her fifth dry well offshore Gujarat and moved to location GS-DW-1-3 further west. On 30th August, Belford began drilling her sixth well on this block in water depths of 2500 metres to a target depth of 3800 metres.

At the previous location there was porous limestone but it was not charged, we are told. After this, Belford will sail offshore Mumbai to drill one or two wells in a channel levee complex.

So far we have explored carbonates. We now want to explore other plays.

ONGC will then move Belford south to offshore Kerala Konkan to drill at a location in water depths of 1400 metres. After this Belford will move to the eastern offshore in December.

The west coast will then be on the back burner. ONGC has, identified one or two locations in the Krishna deepwater, one or two in the Godavari deepwater and two in the Mahanadi deepwater basins for Belford.

All these locations are on ONGCs NELP-II blocks and sit in water depths of more than 1800 metres. In late August meanwhile, Discoverer abandoned her second dry hole.

The MDT at the second well did not yield any promising results. On 24th August, Discoverer began drilling at her third location: GD-3-1, on the same block as Sagar Vijay, in water depth of 1036 metres to TD of 2800 metres.

Last week the 20-inch casing was lowered but mud loss problems are delaying the lowering of a 13 3/8-inch casing.

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