This excerpt taken from the PBR 6-K filed Aug 13, 2008.
The year-on-year increase in the international lifting cost was caused by the higher price of outsourced services and the wage hike in Argentina, as well as the upturn in the price of maintenance and surveillance services in Colombia, partially offset by the reduction in transport services in the United States.
The 2Q-2008 increase over the previous three months was due to the strike in the Cuenca Austral field and the May 2008 pay rise in Argentina, plus workover activities in Colombia.
This excerpt taken from the PBR 6-K filed Nov 21, 2007.
(A free translation of the original report in Portuguese)