The Bolivian state hydrocarbons company will supply 4,000t.
A report by the New York-based Natural Resource Governance Institute says the Brazilian and Colombian governments offer "satisfactory" laws and practices for oil and gas companies.
The new model aims to attract new players to finance infrastructure projects
The US will reportedly seek a new energy pact as part of the renegotiation of Nafta, which Donald Trump has lambasted and threatened to quit.
The US$2.5bn deal involves the acquisition of Brazilian miner Vale's fertilizer assets by US-based Mosaic.