The pipeline would run from Venezuela through Brazil and on to Argentina to increase natural gas supplies on the continent, Venezuela's state oil company PDVSA said in a statement.
The US$25bn project, which would entail from 8,000-15,000km of pipe and 5-7 years construction time, is based on Venezuela's long-standing claim of over 150 trillion cubic feet in "probable" reserves.
The adhesion agreement was signed at a meeting in Argentina of the Mercosur regional trade bloc.
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