Algeria

Well tests in east-central Algeria indicate the probability that the Ain Tsila gas-condensate discovery in the Illizi basin extends at least 12 km on Isarene permit blocks 228 and 229a, said Petroceltic International Plc.

By OGJ editors
HOUSTON, Dec. 7
– Well tests in east-central Algeria indicate the probability that the Ain Tsila gas-condensate discovery in the Illizi basin extends at least 12 km on Isarene permit blocks 228 and 229a, said Petroceltic International Plc.

Well tests at the AT-2 well after frac resulted in a flow of 4.9 MMscfd from the Ordovician, in line with expectations, and partner Sonatrach has filed a discovery declaration for the well. The well is in the same pressure regime as the AT-1 discovery 12 km north.

AT-2 also logged 4 m of gas-bearing sandstone in Devonian F2, which is to be tested later.

AT-3, 9 km south of AT-2, logged a gas column of more than 80 m in the Ordovician reservoir and is being prepared for tests.

The rig will move to drill INW-2 well in the northwest part of the block, on the Issaouane Northwest prospect, targeting Devonian and Ordovician objectives.

Petroceltic said gas flow rates at AT-2 are mainly from the relatively low porosity and permeability matrix sandstone and that the fracture stimulation does not appear to have communicated with any natural open fractures.

Well AT-2 has demonstrated that the lower quality Ordovician sandstone, with 5-10% porosity, is capable of flowing gas at commercial rates, even in vertical wells.

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