This excerpt taken from the PBR 20-F filed May 22, 2009.
We may not have sufficient resources to support future exploration, production and development activities in our newly discovered pre-salt reservoirs.
Exploiting our oil and gas discoveries in the pre-salt reservoirs will require substantial additional amounts of capital, human resources and a broad range of offshore oil services. A primary operational challenge will be increasing our drilling rig fleet. The availability of existing rigs is limited, as is shipyard capacity to build new drilling units. We are continually forced to prioritize between development wells and exploration wells, and we may not be able to secure as many drilling rigs as we will require to meet our exploration, production and development goals with respect to our pre-salt reservoirs.