How important is G-1 deepwater oil strike?

Vol 3, PW 17 (15 Sep 99) Exploration & Production

Senior officials at ONGC are privately happy with its recent discovery in the Krishna Godavari basin.

This despite the fact the strike happened in the proven G-1 oil-bearing structure. Petrowatch learns ONGC drillers plan a total of four perforations along the casing between depths of 2,100-2,170 metres.

At ONGC meanwhile, the debate over whether this is a new discovery or a rediscovery continues. Many within ONGC stress the strikes have taken place in a deeper, previously unknown horizon of the G-1 structure and should therefore be classed as a "new discovery".

Other says that since G-1 is known to hold oil, there is hardly anything new in the discovery. Nonetheless, the strike has clearly buoyed the spirits of ONGCs Southern Regional Business Centre (SRBC) in Madras.

Elsewhere, along the coasts of Kesanapalli and Kesavadaspalam, ONGC has begun drilling inclined wells onland into the sea. These inclined wells stretch from the shore to a point about 1km into the sea, otherwise accessed from a straight offshore well.

This report learns the cost of each inclined well is only 25% that of a conventional offshore well. A total of six such wells have been planned - two have been drilled with success.

ONGC adds it is acquiring technical expertise to drill inclined wells onshore with a potential to go up to 1.5 km offshore. It hopes to develop the technology to develop fields like Ravva or G-1.

ONGC is confident it can develop the technology to develop such inclined wells to suck oil out of a deepwater reservoir.