Latest Tupi well solidifies giant oil field's size offshore Brazil

By Phaedra Friend Troy

The ninth well drilled on the Tupi formation offshore Brazil has further confirmed the massive size of the oil field.

Appraisal well 3-BRSA-854-RJS (3-RJS-678), also known as the Tupi SW well, has been declared successful, reports project partner BG Group.

Drilled in waters measuring 2,152 meters deep, the Tupi SW well is located 295 kilometers offshore the state of Rio de Janeiro and 11 kilometers southeast of the 3-RJS-646 (3-BRSA-496) well where drill stem testing is currently ongoing to test the pre-salt reservoirs.

The Tupi SW well transected a 128-meter reservoir section, as well as established the deepest oil/water contact for the accumulation, which reduces uncertainty in the reservoir size estimates.

Wireline tests conducted on the Tupi SW well revealed light oil measuring 28 degrees API. 

The Tupi evaluation plan has already been approved by the ANP, and declaration of marketability is expected by December 2010.

Petrobras (NYSE:PBR) serves as the operator of the block with 65 percent interest. Project partners include BG Group with 25 percent and Galp Energia with 10 percent.

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