Controversy over biggest gas find ever made in India

Vol 9, PW 6 (30 Jun 05) Exploration & Production
     

Gujarat chief minister Narendra Modi is under fire for his 26th June announcement of a 20-tcf gas discovery at Gujarat State Petroleums offshore block: KG-OSN-2001/3.

Modi christened this discovery Deen Dayal but later he and GSPC were roundly condemned by oil industry experts for this premature announcement, made after testing only one zone in one discovery well. Rhetoric aside, PETROWATCH is happy to give GSPC the benefit of the doubt and veer towards those who say that this will indeed be the largest gas find ever made in India and the largest global gas find this year.

First some facts: testing of GSPCs third well KG-8 was done using four choke sizes, beginning with 12/64-inches and ending with 24/64 inches. Gas flow was recorded at between 8m cf/d and 11m cf/d at a bottom hole pressure of 14,000-psi and well head pressure of between 6500-psi and 4600-psi.

Stabilised gas flow was recorded at 10m cf/d through a 24/64 inch choke at a well head pressure of 5000-psi. Testing of the produced gas showed it to be dry and 86% methane.

Also present are C2, C3, C4 and even carbon dioxide (3%). We were expecting methane to be only between 70 and 75%.

Permeability in the upper zones is believed to be about 0.05 millidarcies but is expected to be much better in the deeper zones. KG-8 was drilled to 5061 metres and turned up gas shows throughout drilling.

Also recorded were minor oil shows. We planned to drill to 5600 metres but were constrained by the rigs capacity and had to stop, reveals a source.

The gas column was found to be 855 metres thick between 4205 metres and 5060 metres. Seven zones were identified for testing the first between 4747 metres and 4777 metres.

Out of this 30 metre zone, a 10 metre thick interval was perforated on 17th June. Adds a source: This well alone can produce 50m cf/d.

GSPC estimates the Deen Dayal gasfield is at least 75-sq km in size. Testing of the first zone was a nightmare, adds our source.

GSPC was not sure of success, because of the high temperature (349 degrees Fahrenheit) and the high pressure.