Sagar Vijay might bring some good news for ONGC

Vol 8, PW 20 (12 Jan 05) Exploration & Production

With some luck ONGCs run of dry wells could end thanks to some good news expected from drillship Sagar Vijay.

Sitting at location G-4-3 off the eastern coast in the Godavari basin, ONGC-owned Sagar Vijay completed drilling a well to a target depth of 3019 metres in the last week of December. Logs have clearly indicated the presence of gas, reveals an ONGC source.

Estimates of in-place reserves can be made only after testing, learnt this report last week. Testing began after 10th January because of delayed supplies to the drillship following the tsunami that lashed parts of India and southeast Asia on 26th December.

ONGC is upbeat about the prospectivity of Sagar Vijays current well, which sits in 524 metres water depth some 25-km from shore. Seven or eight zones were identified between 2100 metres and 2200 metres, we are told.

But we will be testing only two zones because the others very clearly show the presence of gas. ONGC says initial findings indicate seven or eight sands likely to yield more than 200,000 cm/d.

The total thickness of these Pliocene era sands is about 70 metres. The sands are not interconnected and have more than 20% porosity.

The grains of the sand are, medium to coarse. The present well is Sagar Vijays third.

The first well showed small to moderate quantities of gas and the second well was dry. ONGC feels G-4-1 (the first well) and G-4-3 could together hold about one trillion cubic feet in place gas.

Recovery factor for gas is about 70%, he adds. Both wells could be connected to one offshore platform.