Ambitious plan to halt Ahmedabad asset decline

Vol 18, PW 11 (29 Jan 15) Exploration & Production

ONGC is planning a Rs496cr ($79m) 108-well campaign to reverse declining production at its Ahmedabad asset in Gujarat.

Thirty-three wells will be drilled in Area I in the Kadi and Mehsana ‘talukas’ of Mehsana district and another 75 in Area II in the Mansa, Kalol and Gandhinagar ‘talukas’ of Gandhinagar district. “We plan to begin the campaign in August 2015,” says ONGC, “once all approvals are in place.

” A mandatory public hearing to clear the campaign was held at 11.30 am on January 23, 2015 at the Chhatral GIDC Association Hall on the Mehsana highway. “Both vertical and horizontal wells are planned,” adds ONGC.

Eight will be horizontal and the remaining 100 vertical. “Drilling horizontal wells is expensive compared to vertical wells,” we hear.

ONGC says drilling a vertical well costs Rs4cr ($633,000) and a horizontal well Rs12cr ($1.9m) - three times more. This includes land preparation, civil works, rent and farmer compensation pay-outs, rig mobilisation and operation, well-completion, production testing, cementing, drilling fluids and logging in addition to geology and reservoir costs.

All wells will be drilled to TDs of 800-2000 metres and take around 15-30 days each to complete. ONGC produces 26,000 b/d and 580,000 cm/d from its Ahmedabad asset, which is divided into Areas I to IV across Mehsana, Gandhinagar, Kheda and Ahmedabad districts.