Argentina: Madalena presses shale, tight gas work

By OGJ editors
– Madalena Ventures Inc., Calgary, said its Argentina subsidiary is drilling to test numerous formations on its various blocks in the Neuquen basin in Argentina.

The Yapai X-1001 well on the Curamhuele block went to 10,743 ft measured total depth, 10,478 ft true vertical depth, and penetrated the Cretaceous Lower Troncoso and Avile formations. Logs indicate a potential gross hydrocarbon column of 23 ft in Lower Troncoso at 4,394 ft TVD and multiple stacked Avile formations from 6,530 ft to 10,360 ft TVD.

Madalena Austral SA will set 7-in. casing to TD and test several Avile sands and the Lower Troncoso formation in the third quarter of 2011. Two earlier wells, Curamhuele X-1 and Yapai X-1, have been drilled into the Cretaceous Mulichinco tight sand formation and will be reviewed for potential reentry to test the Cretaceous-Jurassic Vaca Muerta shale formation.

Testing of CAS X-1 on the Coiron Amargo block is delayed due to poor cement across the Jurassic Sierras Blancas formation. After remedial cement jobs, the well tested as much as 150 b/d of oil from Sierras Blancas, natural. Madalena plans to frac before perforating and testing the Vaca Muerta formation. Later, the company will test the CAN X-4 well in the northern part of the block.

The CorS X-1 well, targeting the Cretaceous Quintuco, Mulichinco, Vaca Muerta shale, and Upper Jurassic Tordillo tight sand formations on the Cortadera block, is drilling at 4,500 ft and is to reach total depth in late July or early August 2011.

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