The mining and energy ministry says the changes are designed to attract long-term investment in exploration and production.
The largest project is the US$1.4bn Veracruz port expansion.
The tenders are for works in state capital São Paulo as well as the cities of Santa Isabel, Berueri and Carapicuiba.
The original concession contract calls for the development, construction, operation and management of a container terminal in the Coco Solo Norte port in Panama's Colón province.
The announcement came as regulator ANP published bidding and contract terms for the May 11 tender, which will offer rights to develop nine areas in the states of Espírito Santo, Rio Grande do Norte and Bahia.
Studies to change the way Brazil's long-term interest rate (TJLP) is calculated have included the input of directors from both BNDES and the central bank, as well as the finance ministry.
Projects include work to extend line No. 2 of the São Paulo state metro company by 14.5km.