Disappointing results at Jubilant's Cauvery well

Vol 13, PW 19 (11 Mar 10) Exploration & Production

This is news Jubilant Energy would rather not disclose as it prepares to list on the Alternative Investment Market in London.

PETROWATCH learns initial results from Jubilant’s well testing campaign at its 680-sq km NELP-IV onland Cauvery block CY-ONN-2002/1 in Tamil Nadu are disappointing. Early in January, Jubilant began testing well CY-2 for the first time.

“Jubilant tested two zones at CY-2,â€‌ an industry source tells us. “But gas did not flow to the surface.

â€‌ Jubilant had high hopes for this well when it was first drilled and completed in September 2008, we learn, revealing traces of gas. So why did it find no gas this time during testing “Sands in CY-2 are low in porosity and permeability,â€‌ explains a source.

“I think the formation must have been damaged during initial drilling.â€‌ Jubilant began its latest testing campaign at this block last December on three exploration wells: CY-1, CY-2 and CY-4 - all drilled between end-2007 and September 2008.

Techno Canada was hired to carry out â€کconventional testing’ as Jubilant did not want to spend money on a more expensive Drill Stem Test. Jubilant also hired a 1000-hp workover rig from John Energy and contracted Halliburton to â€کhydrofrac’ the three wells to increase the porosity and permeability of the sands.

“It’s difficult to explain why Halliburton’s hydrofrac job did not work at CY-2,â€‌ adds a source. “Jubilant spent nearly a month on this well.

Earlier it thought 15 to 20 days would be enough.â€‌ CY-2 was first cleaned with acid and then with nitrogen, after which testing began.

â€‌ John Energy’s rig has now moved to well CY-1. Drilled end-2007, this well created great excitement when it was first tested in January 2008 and flowed 1000cm/d gas through a آ½-inch choke in the Sattapadi and Andimadam formations at 3200 metres to 4000 metres below surface.

After testing CY-1, Jubilant will begin testing the third well: CY-4.