ONGC on 36-well exploration drive in Gujarat

Vol 17, PW 26 (14 Aug 14) Exploration & Production

ONGC wants to drill 36 exploration wells by the end of this fiscal or March 31 next year (2015) across the Ahmedabad, Ankleshwar, Mehsana and Cambay sub-asset in Gujarat.

ONGC's Western Onshore Basin exploration division in Vadodara, once the seat of a princely state, tells us it will drill 13 at Ankleshwar, 10 at Ahmedabad, nine at Mehsana and four at the Cambay sub-asset, each costing between Rs5 to Rs20cr including services and depending on depths drilled. ONGC is confident the drilling programme will add 25m tonnes of in-place Oil and Oil Equivalent Gas (O+OEG) to reserves.

Four wells have already been drilled at Ankleshwar and three at the Cambay-sub asset. “Our first well was spud on April 8 at Jambusar in Ankleshwar,” says a source.

Of the seven wells drilled, two at Ankleshwar were dry and one was dry at Cambay sub-asset. This month (August) ONGC will begin drilling at Ahmedabad and Mehsana.

All the wells will be drilled up to 4000 metres TD using up to 10 rigs owned by ONGC of between 750-hp and 1500-hp capacity. Each well will take two months to complete.

At Ahmedabad ONGC will encounter the Olpad, older Cambay shale, younger Cambay shale, Kalol sands and Babaguru formations. At Ankleshwar it will hit the Hazad sands, Tarkeshwar and Babaguru formations.

Mehsana has the Olpad, Mandhali, Chhatral and Kalol sands formations. Cambay sub-asset has mainly ‘Eocene’ Chhatral formation rocks.

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