Minor problems for ONGC with Belford Dolphin

Vol 8, PW 1 (07 Apr 04) Exploration & Production
     

No success yet in sight for ONGC at its second western offshore deepwater location, where drillship Belford Dolphin spud well DW-RO-1A on 5th March in 1,100 metres water depth.

Offshore location DW-RO-1A lies close to the Gujarat temple town of Dwarka. By the end of last week the well had reached a depth of 2,560 metres at which point the 13 3/8-inch casing was lowered.

Next to be lowered will be the 9 5/8-inch casing and finally the 7-inch liner. So far theres no indication of a discovery.

It will not be possible to say anything until we cross 3,000 metres, says a source. ONGC is looking for multiple objects and expects to find something around 2,800 metres depth.

Information reviewed by this report reveals that Belford Dolphin is presently drilling through the Mahim shale formation. We also learn that ONGC encountered minor problems with the current well unlike Belfords first well GK-DW-A-A, which was drilled 70 nautical miles west of the present location to a depth of 6,030 metres and abandoned as a dry hole.

Drilling at the previous location was smooth, he adds. But here we encountered a hole collapse and a stuck pipe.

We lost some time to sort out these problems, but these are not uncommon while drilling. How much more time to the targeted 6,500 metres depth Well only be sure about the time frame when we reach around 4,000 metres.

Separately, Transocean drillship Discoverer Seven Seas continues to drill at ONGCs eastern offshore deepwater location KD-1-3 where it spud its first well on block KG-OS-DW on 27th February, four days behind schedule. Discoverer is sitting in 1,400 metres water depth and will drill to a target depth of 3,700 metres.

Theres nothing exciting to report from the Discoverer drilling either, except that the drill bit had reached 2,360 metres depth by the end of last week when a 13 3/8-inch casing was lowered. Discoverer has drilled through the Godavari clays and is now drilling through the Krishna formation after which it will drill through the Ravva formation.

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